Patent ID: 7236055
Filing Date: 2007-06-26
Classification: H03F

Abstract:
1. An amplifier comprising: (a) an input stage for amplifying signals in a signal path of a differential input signal, and an output stage coupled to a signal path of the input stage for producing an output signal; (b) the input stage including main input circuitry for amplifying relatively small-value signals in the signal path of the differential input signal, the input stage also including alternative input circuitry for amplifying signals in the signal path of the differential input signal during a condition which otherwise would cause thermal imbalance in the main input circuitry; and (c) the input stage including switching circuitry for coupling signals in the signal path of the differential input signal to the main input circuitry during normal small-signal operating conditions and for coupling signals in the signal path of the input signal to the alternative input circuitry during the condition which otherwise would cause thermal imbalance in the main input circuitry.