Input circuit, output circuit, input-output circuit and method of processing input signals

An input-output circuit used between semiconductor devices connected through transmission lines comprising:

• an output circuit for transmitting a signal between semiconductor devices wherein a signal fed to said output circuit is converted to a signal having a predetermined amplitude level and an amplitude center level to produce a small-amplitude signal for transmission;
• an input circuit for transmitting a signal between semiconductor devices with an input stage and an output stage, said input circuit comprising a threshold value detecting means to detect a threshold value of said output stage;
• a feedback amplifier that compares the threshold value and an amplitude center level, whereby the amplitude level of a signal fed from said input stage to said output stage is amplified in accordance with said threshold value detected by said threshold value detecting means;
• and
• transmission lines to connect said output circuit to said input circuit.

An input-output circuit used between semiconductor devices connected through transmission lines comprising:

• an output circuit for transmitting a signal between semiconductor devices wherein a signal fed to said output circuit is converted to a signal having a predetermined amplitude level and an amplitude center level to produce a small-amplitude signal for transmission;
• an input circuit for transmitting a signal between semiconductor devices with an input stage and an output stage, comprising a threshold value detecting means to detect a threshold value of said output stage, whereby said threshold value of said output stage detected by said threshold value detecting means and an amplitude center level of a signal fed to said stage from said input stage are detected and compared and whereby currents to be supplied to said input stage are controlled so that said threshold value and amplitude center level are equal, and said amplitude center level of said signal fed from input stage is determined in accordance with variations in said threshold value of said output stage detected by said threshold value detecting means;
• and
• transmission lines to connect said output circuit to said input circuit.

An input-output circuit used between semiconductor devices connected through transmission lines comprising:

• an output circuit for transmitting a signal between semiconductor devices wherein a signal fed to said output circuit is converted to a signal having a predetermined amplitude level and an amplitude center level to produce a small-amplitude signal for transmission;
• an input circuit for transmitting a signal between semiconductor devices with an input stage and an output stage wherein an amplitude center level of an output signal corresponding to variations in a threshold value of said output stage and the converted signal is fed to said output stage;
• and
• transmission lines to connect said output circuit to said input circuit.

An input circuit for transmitting a signal between semiconductor devices, amplifying a supplied small-amplitude signal to a full-swing amplitude level being equal to or near to that of a power supply voltage and feeding it as a logic signal, said input circuit comprising:

• an amplifying section to output an amplitude center voltage of said small-amplitude signal and converting said small-amplitude signal by amplification to a logic signal having a predetermined amplitude level;
• a threshold value detecting means to detect a signal inversion point voltage of a CMOS logic circuit receiving an output signal from said amplifying section;
• a constant current circuit to control amplification factor and amplified signal amplitude center level in said amplifying section;
• and
• a feedback amplifier to compare a signal amplitude center voltage outputted from said amplifying section with a signal inversion point voltage of said CMOS logic circuit detected by said threshold value detecting means and to feed a voltage back to said constant current circuit so that an amplitude center level of a signal amplified by said amplifying section is equal to said signal inversion point voltage of said CMOS logic circuit.

An input circuit for transmitting a signal between semiconductor devices, amplifying a supplied small-amplitude signal to a full-swing amplitude level being equal to or near to that of a power supply voltage and feeding it as a logic signal, said input circuit comprising:

• an amplitude center voltage detecting means to detect the amplitude center level of said small-amplitude signal;
• an amplifying circuit to convert said small-amplitude signal by amplification to a logic signal having a predetermined amplitude level;
• a constant current circuit to control amplification factor and amplified signal amplitude center level in said amplifying circuit;
• a CMOS logic circuit to convert a signal amplified by said amplifying circuit to said logic signal;
• a threshold value detecting means to a signal inversion point voltage of said CMOS logic circuit;
• and
• a feedback amplifier to compare an amplitude center level detected by said amplitude center voltage detecting means with a signal inversion point voltage of said CMOS logic circuit detected by said threshold value detecting means and to feed a voltage back to said constant current circuit so that an amplitude center voltage of a signal to be amplified by said amplifying circuit is equal to a signal inversion point voltage of said CMOS logic circuit.

An input circuit for transmitting a signal between semiconductor devices, amplifying a supplied small-amplitude signal to a full-swing amplitude level being equal to or near to that of a power supply voltage and feeding it as a logic signal, said input circuit comprising:

• a level conversion circuit to control a center level of said small-amplitude signal;
• an amplitude center voltage detecting means to detect an amplitude center level of a signal fed from said level conversion circuit;
• a threshold value detecting means to detect a signal inversion point voltage of a CMOS logic circuit receiving an output signal from said level conversion circuit;
• a constant current circuit to control amounts of voltage to be shifted by said level conversion circuit;
• and
• a feedback amplifier to compare an amplitude center voltage outputted by said level conversion circuit with a signal inversion point voltage of said CMOS logic circuit detected by said threshold value detecting means and to feed a voltage back to said constant current circuit so that an amplitude center voltage outputted from said level conversion circuit is equal to a signal inversion point voltage of said CMOS logic circuit.

An input circuit for transmitting a signal between semiconductor devices, amplifying a supplied small-amplitude signal to a full-swing amplitude level being equal to or near to that of a power supply voltage and feeding it as a logic signal, said input circuit comprising:

• a level conversion circuit to control a center level of said small-amplitude signal;
• an amplitude center voltage detecting means to detect a signal amplitude center voltage supplied from said level conversion circuit;
• a mos logic circuit to convert a signal having a level shifted by said level conversion circuit to said logic signal;
• a threshold value detecting means to detect a signal inversion point voltage of said CMOS logic circuit;
• a constant current circuit to control amounts of voltage to be shifted by said level conversion circuit;
• and
• a feedback amplifier to compare an amplitude center voltage outputted by said amplitude center voltage detecting means with a signal inversion point voltage of said CMOS logic circuit detected by said threshold value detecting means and to feed a voltage back to said constant current circuit so that an amplitude center voltage outputted from said level conversion circuit is equal to a signal inversion point voltage of said CMOS logic circuit.

An output circuit for transmitting a signal between semiconductor devices, converting a su supplied input signal to a small-amplitude transmission signal on the basis of a specified small-amplitude interfacing specifications and feeding it, said output circuit comprising:

• a constant voltage generating means to generate a voltage used to set an output center level of said small-amplitude transmission signal;
• an output section to detect an output center level from said output transmission signal and to convert an amplitude of said output transmission signal to a predetermined amplitude;
• and
• a feedback amplifier to compare an output center level outputted by a constant voltage circuit used to shift an output center level of said supplied transmission signal and by said output section with a voltage generated by said constant voltage generating means and to feed a voltage back to said constant current circuit so that an output center level of a small-amplitude signal outputted from said output section is equal to a voltage value set by said constant voltage generating means.

An output circuit for transmitting a signal between semiconductor devices, converting a supplied input signal to a small-amplitude transmission signal on the basis of a specified small-amplitude interfacing specifications and feeding it, said output circuit comprising:

• a reference voltage generating means used to produce an output center level voltage of said small-amplitude transmission signal;
• an output center voltage detecting means to detect an output center level from said output transmission signal;
• a constant voltage circuit used to shift an output center level of said output transmission signal;
• a feedback amplifier to compare an output center level detected by said output center voltage detecting means with a voltage generated by said reference voltage generating means and to feed a voltage back to said constant current circuit so that an output center level of said output transmission signal is equal to a voltage value set by said reference voltage generating means;
• and
• an amplitude level changing means to convert an amplitude of said supplied input signal to a predetermined small-amplitude level.

An input-output circuit used between semiconductor devices connected through transmission lines comprising:

• an input circuit for transmitting a signal between semiconductor devices, amplifying a supplied small-amplitude signal to a fill-swing amplitude level being equal to or near to that of a power supply voltage and feeding it as a logic signal, said input circuit comprising:
• an amplifying section to output an amplitude center voltage of said small-amplitude signal and converting said small-amplitude signal by amplification to a logic signal having a predetermined amplitude level;
• a threshold value detecting means to detect a signal inversion point voltage of a CMOS logic circuit receiving an output signal from said amplifying section;
• a constant current circuit to control amplification factor and amplified signal amplitude center level in said amplifying section;
• and
• a feedback amplifier to compare a signal amplitude center voltage outputted from said amplifying section with a signal inversion point voltage of said CMOS logic circuit detected by said threshold value detecting means and to feed a voltage back to said constant current circuit so that an amplitude center level of a signal amplified by said amplifying section is equal to said signal inversion point voltage of said CMOS logic circuit;
• an output circuit for transmitting a signal between semiconductor devices, converting a supplied input signal to a small-amplitude transmission signal on the basis of a specified small-amplitude interfacing specifications and feeding it, said output circuit comprising:
• a constant voltage generating means to generate a voltage used to set an output center level of said small-amplitude transmission signal;
• an output section to detect an output center level from said output transmission signal and to convert an amplitude of said output transmission signal to a predetermined amplitude;
• and
• a feedback amplifier to compare an output center level outputted by a constant voltage circuit used to shift an output center level of said supplied transmission signal and by said output section with a voltage generated by said constant voltage generating means and to feed a voltage back to said constant current circuit so that an output center level of a smallamplitude signal outputted from said output section is equal to a voltage value set by said constant voltage generating means;
• and
• transmission lines to connect said output circuit to said input circuit.

An input-output circuit used between semiconductor devices connected through transmission lines comprising:

• an input circuit for transmitting a signal between semiconductor devices, amplifying a supplied small-amplitude signal to a full-swing amplitude level being equal to or near to that of a power supply voltage and feeding it as a logic signal, said input circuit comprising:
• an amplitude center voltage detecting means to detect the amplitude center level of said small-amplitude signal;
• an amplifying circuit to convert said small-amplitude signal by amplification to a logic signal having a predetermined amplitude level;
• a constant current circuit to control amplification factor and amplified signal amplitude center level in said amplifying circuit;
• a CMOS logic circuit to convert a signal amplified by said amplifying circuit to said logic signal;
• a threshold value detecting means to a signal inversion point voltage of said CMOS logic circuit;
• and
• a feedback amplifier to compare an amplitude center level detected by said amplitude center voltage detecting means with a signal inversion point voltage of said CMOS logic circuit detected by said threshold value detecting means and to feed a voltage back to said constant current circuit so that an amplitude center voltage of a signal to be amplified by said amplifying circuit is equal to a signal inversion point voltage of said CMOS logic circuit;
• an output circuit for transmitting a signal between semiconductor devices, converting a supplied input signal to a small-amplitude transmission signal on the basis of a specified small-amplitude interfacing specifications and feeding it, said output circuit comprising:
• a constant voltage generating means to generate a voltage used to set an output center level of said small-amplitude transmission signal;
• an output section to detect an output center level from said output transmission signal and to convert an amplitude of said output transmission signal to a predetermined amplitude;
• and
• a feedback amplifier to compare an output center level outputted by a constant voltage circuit used to shift an output center level of said supplied transmission signal and by said output section with a voltage generated by said constant voltage generating means and to feed a voltage back to said constant current circuit so that an output center level of a small-amplitude signal outputted from said output section is equal to a voltage value set by said constant voltage generating means;
• and
• transmission lines to connect said output circuit to said input circuit.

An input-output circuit used between semiconductor devices connected through transmission lines comprising:

• an input circuit for transmitting a signal between semiconductor devices, amplifying a supplied small-amplitude signal to a full-swing amplitude level being equal to or near to that of a power supply voltage and feeding it as a logic signal, said input circuit comprising:
• a level conversion circuit to control a center level of said small-amplitude signal;
• an amplitude center voltage detecting means to an amplitude center level of a signal fed from said level conversion circuit;
• a threshold value detecting means to detect a signal inversion point voltage of a CMOS logic circuit receiving an output signal from said level conversion circuit;
• a constant current circuit to control amounts of voltage to be shifted by said level conversion circuit;
• and
• a feedback amplifier to compare an amplitude center voltage outputted by said level conversion circuit with a signal inversion point voltage of said CMOS logic circuit detected by said threshold value detecting means and to feed a voltage back to said constant current circuit so that an amplitude center voltage outputted from said level conversion circuit is equal to a signal inversion point voltage of said CMOS logic circuit;
• an output circuit for transmitting a signal between semiconductor devices, converting a supplied input signal to a small-amplitude transmission signal on the basis of a specified small-amplitude interfacing specifications and feeding it, said output circuit comprising:
• a constant voltage generating means to generate a voltage used to set an output center level of said small-amplitude transmission signal;
• an output section to detect an output center level from said output transmission signal and to convert an amplitude of said output transmission signal to a predetermined amplitude;
• and
• a feedback amplifier to compare an output center level outputted by a constant voltage circuit used to shift an output center level of said supplied transmission signal and by said output section with a voltage generated by said constant voltage generating means and to feed a voltage back to said constant current circuit so that an output center level of a small-amplitude signal outputted from said output section is equal to a voltage value set by said constant voltage generating means;
• and
• transmission lines to connect said output circuit to said input circuit.

An input-output circuit used between semiconductor devices connected through transmission lines comprising:

• an input circuit for transmitting a signal between semiconductor devices, amplifying a supplied small-amplitude signal to a full-swing amplitude level being equal to or near to that of a power supply voltage and feeding it as a logic signal, said input circuit comprising:
• a level conversion circuit to control a center level of said small-amplitude signal;
• an amplitude center voltage detecting means to detect a signal amplitude center voltage supplied from said level conversion circuit;
• a CMOS logic circuit to convert a signal having a level shifted by said level conversion circuit to said logic signal;
• a threshold value detecting means to detect a signal inversion point voltage of said CMOS logic circuit;
• a constant current circuit to control amounts of voltage to be shifted by said level conversion circuit;
• and
• a feedback amplifier to compare an amplitude center voltage outputted by said amplitude center voltage detecting means with a signal inversion point voltage of said CMOS logic circuit detected by said threshold value detecting means and to feed a voltage back to said constant current circuit so that an amplitude center voltage outputted from said level conversion circuit is equal to a signal inversion point voltage of said CMOS logic circuit;
• an output circuit for transmitting a signal between semiconductor devices, converting a supplied input signal to a small-amplitude transmission signal on the basis of a specified small-amplitude interfacing specifications and feeding it, said output circuit comprising:
• a constant voltage generating means to generate a voltage used to set an output center level of said small-amplitude transmission signal;
• an output section to detect an output center level from said output transmission signal and to convert an amplitude of said output transmission signal to a predetermined amplitude;
• and
• a feedback amplifier to compare an output center level outputted by a constant voltage circuit used to shift an output center level of said supplied transmission signal and by said output section with a voltage generated by said constant voltage generating means and to feed a voltage back to said constant current circuit so that an output center level of a smallamplitude signal outputted from said output section is equal to a voltage value set by said constant voltage generating means;
• and
• transmission lines to connect said output circuit to said input circuit.

An input-output circuit used between semiconductor devices connected through transmission lines comprising:

• an input circuit for transmitting a signal between semiconductor devices, amplifying a supplied small-amplitude signal to a full-swing amplitude level being equal to or near to that of a power supply voltage and feeding it as a logic signal, said input circuit comprising:
• an amplifying section to output an amplitude center voltage of said small-amplitude signal and converting said small-amplitude signal by amplification to a logic signal having a predetermined amplitude level;
• a threshold value detecting means to detect a signal inversion point voltage of a CMOS logic circuit receiving an output signal from said amplifying section;
• a constant current circuit to control amplification factor and amplified signal amplitude center level in said amplifying section;
• and
• a feedback amplifier to compare a signal amplitude center voltage outputted from said amplifying section with a signal inversion point voltage of said CMOS logic circuit detected by said threshold value detecting means and to feed a voltage back to said constant current circuit so that an amplitude center level of a signal amplified by said amplifying section is equal to said signal inversion point voltage of said CMOS logic circuit;
• an output circuit for transmitting a signal between semiconductor devices, converting a supplied input signal to a small-amplitude transmission signal on the basis of a specified small-amplitude interfacing specifications and feeding it, said output circuit comprising:
• a reference voltage generating means used to produce an output center level voltage of said small-amplitude transmission signal;
• an output center voltage detecting means to detect an output center level from said output transmission signal;
• a constant voltage circuit used to shift an output center level of said output transmission signal;
• a feedback amplifier to compare an output center level detected by said output center voltage detecting means with a voltage generated by said reference voltage generating means and to feed a voltage back to said constant current circuit so that an output center level of said output transmission signal is equal to a voltage value set by said reference voltage generating means;
• and
• an amplitude level changing means to convert an amplitude of said supplied input signal to a predetermined small-amplitude level;
• and
• transmission lines to connect said output circuit to said input circuit.

An input-output circuit used between semiconductor devices connected through transmission lines comprising:

• an input circuit for transmitting a signal between semiconductor devices, amplifying a supplied small-amplitude signal to a full-swing amplitude level being equal to or near to that of a power supply voltage and feeding it as a logic signal, said input circuit comprising:
• an amplitude center voltage detecting means to detect the amplitude center level of said small-amplitude signal;
• an amplifying circuit to convert said small-amplitude signal by amplification to a logic signal having a predetermined amplitude level;
• a constant current circuit to control amplification factor and amplified signal amplitude center level in said amplifying circuit;
• a CMOS logic circuit to convert a signal amplified by said amplifying circuit to said logic signal;
• a threshold value detecting means to a signal inversion point voltage of said CMOS logic circuit;
• and
• a feedback amplifier to compare an amplitude center level detected by said amplitude center voltage detecting means with a signal inversion point voltage of said CMOS logic circuit detected by said threshold value detecting means and to feed a voltage back to said constant current circuit so that an amplitude center voltage of a signal to be amplified by said amplifying circuit is equal to a signal inversion point voltage of said CMOS logic circuit;
• an output circuit for transmitting a signal between semiconductor devices, converting a supplied input signal to a small-amplitude transmission signal on the basis of a specified small-amplitude interfacing specifications and feeding it, said output circuit comprising:
• a reference voltage generating means used to produce an output center level voltage of said small-amplitude transmission signal;
• an output center voltage detecting means to detect an output center level from said output transmission signal;
• a constant voltage circuit used to shift an output center level of said output transmission signal;
• a feedback amplifier to compare an output center level detected by said output center voltage detecting means with a voltage generated by said reference voltage generating means and to feed a voltage back to said constant current circuit so that an output center level of said output transmission signal is equal to a voltage value set by said reference voltage generating means;
• and
• an amplitude level changing means to convert an amplitude of said supplied input signal to a predetermined small-amplitude level;
• and
• transmission lines to connect said output circuit to said input circuit.

An input-output circuit used between semiconductor devices connected through transmission lines comprising:

• an input circuit for transmitting a signal between semiconductor devices, amplifying a supplied small-amplitude signal to a full-swing amplitude level being equal to or near to that of a power supply voltage and feeding it as a logic signal, said input circuit comprising:
• a level conversion circuit to control a center level of said small-amplitude signal;
• an amplitude center voltage detecting means to an amplitude center level of a signal fed from said level conversion circuit;
• a threshold value detecting means to detect a signal inversion point voltage of a CMOS logic circuit receiving an output signal from said level conversion circuit;
• a constant current circuit to control amounts of voltage to be shifted by said level conversion circuit;
• and
• a feedback amplifier to compare an amplitude center voltage outputted by said level conversion circuit with a signal inversion point voltage of said CMOS logic circuit detected by said threshold value detecting means and to feed a voltage back to said constant current circuit so that an amplitude center voltage outputted from said level conversion circuit is equal to a signal inversion point voltage of said CMOS logic circuit;
• an output circuit for transmitting a signal between semiconductor devices, converting a supplied input signal to a small-amplitude transmission signal on the basis of a specified small-amplitude interfacing specifications and feeding it, said output circuit comprising:
• a reference voltage generating means used to produce an output center level voltage of said small-amplitude transmission signal;
• an output center voltage detecting means to detect an output center level from said output transmission signal;
• a constant voltage circuit used to shift an output center level of said output transmission signal;
• a feedback amplifier to compare an output center level detected by said output center voltage detecting means with a voltage generated by said reference voltage generating means and to feed a voltage back to said constant current circuit so that an output center level of said output transmission signal is equal to a voltage value set by said reference voltage generating means;
• and
• an amplitude level changing means to convert an amplitude of said supplied input signal to a predetermined small-amplitude level;
• and
• transmission lines to connect said output circuit to said input circuit.

An input-output circuit used between semiconductor devices connected through transmission lines comprising:

• an input circuit for transmitting a signal between semiconductor devices, amplifying a supplied small-amplitude signal to a full-swing amplitude level being equal to or near to that of a power supply voltage and feeding it as a logic signal, said input circuit comprising:
• a level conversion circuit to control a center level of said small-amplitude signal;
• an amplitude center voltage detecting means to detect a signal amplitude center voltage supplied from said level conversion circuit;
• a CMOS logic circuit to convert a signal having a level shifted by said level conversion circuit to said logic signal;
• a threshold value detecting means to detect a signal inversion point voltage of said CMOS logic circuit;
• a constant current circuit to control amounts of voltage to be shifted by said level conversion circuit;
• and
• a feedback amplifier to compare an amplitude center voltage outputted by said amplitude center voltage detecting means with a signal inversion point voltage of said CMOS logic circuit detected by said threshold value detecting means and to feed a voltage back to said constant current circuit so that an amplitude center voltage outputted from said level conversion circuit is equal to a signal inversion point voltage of said CMOS logic circuit;
• an output circuit for transmitting a signal between semiconductor devices, converting a supplied input signal to a small-amplitude transmission signal on the basis of a specified small-amplitude interfacing specifications and feeding it, said output circuit comprising:
• a reference voltage generating means used to produce an output center level voltage of said small-amplitude transmission signal;
• an output center voltage detecting means to detect an output center level from said output transmission signal;
• a constant voltage circuit used to shift an output center level of said output transmission signal;
• a feedback amplifier to compare an output center level detected by said output center voltage detecting means with a voltage generated by said reference voltage generating means and to feed a voltage back to said constant current circuit so that an output center level of said output transmission signal is equal to a voltage value set by said reference voltage generating means;
• and
• an amplitude level changing means to convert an amplitude of said supplied input signal to a predetermined small-amplitude level;
• and
• transmission lines to connect said output circuit to said input circuit.