US 6,204,692 B1 · Driver circuit unit

Abstract

When a driver circuit unit issues data to a receiver through a transmission line, the unit performs a matching operation to the characteristic impedance of the transmission line so that the logic level of an input signal received by the receiver is properly controlled, the unit includes a first push-pull circuit for issuing an output signal to an output terminal through resistors when transmitted data is issued to an input terminal, the output signal having its logic level correspond to the transmitted data; a second push-pull circuit for issuing a negative-phase output signal to an output terminal through resistors when negative-phase data, which is one reversed in phase of the above transmitted data, is issued to an input terminal, the negative-phase output signal having its logic level correspond to the negative-phase data; and, a resistor connected between the first output terminal and the second output terminal.

Claims28

Dependent claims

A driver circuit unit having a first output terminal and a second output terminal connected with a receiver through a first and a second transmission line, respectively, said driver circuit unit comprising:

a first circuit for issuing an output signal to said first output terminal through a first resistor and a second resistor when transmitted data is issued to a first input terminal, said output signal having its logic level correspond to said transmitted data;
a second circuit for issuing an negative-phase output signal to said second output terminal through a third resistor and a fourth resistor when negative-phase data, which is one reversed in phase of said transmitted data, is issued to a second input terminal, said negative-phase output signal having its logic level correspond to said negative-phase data;
and
an adjusting resistor connected between said first output terminal and said second output terminal.

1 more element

A driver circuit unit having a first and a second output terminal both connected with a receiver through a first and a second transmission line, respectively, said driver circuit unit comprising:

a first circuit for issuing an output signal to said first output terminal through a first resistor and a second resistor when transmitted data is issued to a first input terminal, said output signal having its logic level correspond to said transmitted data;
a second circuit for issuing a negative-phase output signal to said second output terminal through a third resistor when negative-phase data, which is one reversed in phase of said transmitted data, is issued to a second input terminal, said negative-phase output signal having its logic level correspond to said negative-phase data;
and
an adjusting resistor connected between said first and said second output terminals
wherein said first circuit comprises:
a first switching element connected between a power supply line and said first output terminal, said first switching element being turned ON and OFF according to said transmitted data;
said first resistor interposed between said first switching element and said first output terminal;
a second switching element connected between said first output terminal and the ground, said second switching element being turned ON and OFF according to said transmitted data when said first switching element is turned OFF and ON, respectively;
and
said second resistor interposed between said second switching element and said first output terminal.

7 more elements

A driver circuit unit having a first and a second output terminal both connected with a receiver through a first and a second transmission line, respectively, said driver circuit unit comprising:

a first circuit for issuing an output signal to said first output terminal through a first resistor and a second resistor when transmitted data is issued to a first input terminal, said output signal having its logic level correspond to said transmitted data;
a second circuit for issuing a negative-phase output signal to said second output terminal through a third resistor when negative-phase data, which is one reversed in phase of said transmitted data, is issued to a second input terminal, said negative-phase output signal having its logic level correspond to said negative-phase data;
and
an adjusting resistor connected between said first and said second output terminals
wherein said second circuit comprises:
a third switching element connected between a power supply line and said second output terminal, said third switching element being turned ON and OFF according to said transmitted data;
said third resistor interposed between said third switching element and said second output terminal;
a fourth switching element connected between said second output terminal and the ground, said fourth switching element being turned ON and OFF according to said transmitted data when said third switching element is turned OFF and ON, respectively;
and
a fourth resistor interposed between said fourth switching element and said second output terminal.

7 more elements

Dependencies are inferred from the claim text.

Driver circuit unit

Life of this patent

Driver circuit unit

Life of this patent

Abstract

Claims28