Circuit and method for correcting thermal deviations of one or more output signals from an amplifier with early effect compensation
AssigneeAgilent Technologies, Inc.
InventorBernd Wuppermann
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Abstract
A circuit and method for correcting thermal deviations of one or more output signals from an amplifier utilizes Early effect-compensated correcting signals to reduce the thermal deviations of the output signals. The correcting signals are derived from temperature-dependent signals, which correspond to the thermal deviations of the output signal. The temperature-dependent signals, however, include errors due to Early effect. The Early effect errors are compensated in the correcting signals by introducing reverse Early effect errors into the correcting signals. Consequently, the compensating signals can be used to more effectively correct the thermal deviations of the output signals.
Claims22
A circuit for correcting thermal deviations of an output signal comprising:
- a thermal sensing unit including a first transistor that is connected to generate a temperature-dependent signal in response to a first input signal, said temperature-dependent signal including an error caused by a voltage change induced by an effective base width variation of said first transistor in responding to said first input signal;
- and
- an error compensating unit connected to said thermal sensing unit, said error compensating unit including a second transistor that is connected to generate a correcting signal in response to said temperature-dependent signal, said second transistor being further connected to be responsive to an inverse signal of said first input signal to introduce a reverse error into said correcting signal to compensate effects of said error on said correcting signal, said correcting signal corresponding to said thermal deviations of said output signal such that said correcting signal can be used to reduce said thermal deviations of said output signal.
A circuit for correcting thermal deviations of an output signal comprising:
- a first transistor connected between a first high voltage terminal and a first low voltage terminal, said first transistor being connected to be responsive to a first input signal to produce a temperature-dependent signal, said temperature-dependent signal including an error caused by a voltage change induced by an effective base width variation of said first transistor in responding to said first input signal;
- and
- a second transistor connected between a second high voltage terminal and a second low voltage terminal, said second transistor being connected to generate a correcting signal in response to said temperature-dependent signal, said second transistor being further connected to be responsive to an inverse signal of said first input signal to introduce a reverse error into said correcting signal to compensate effects of said error on said correcting signal, said correcting signal corresponding to said thermal deviations of said output signal such that said first correcting signal can be used to reduce said thermal deviations of said output signal.
A method for correcting thermal deviations of an output signal comprising:
- receiving a first input signal and an inverse signal of said first input signal;
- generating a temperature-dependent signal in response to said first input signal using a first transistor, said temperature-dependent signal including an error caused by a voltage change induced by an effective base width variation of said first transistor in responding to said first input signal;
- generating a correcting signal in response to said temperature-dependent signal using a second transistor, including operating said second transistor to be responsive to said inverse signal to introduce a reverse error into said correcting signal to compensate effects of said error on said correcting signal;
- and
- reducing said thermal deviations of said output signal using said correcting signal.
Dependencies are inferred from the claim text.