Patent ID: 6906584

Claim:
A switchable gain amplifier comprising: a first input node adapted to receive a first component of a differential signal; a second input node adapted to receive a second component of the differential signal; a first differential amplifier having a first input terminal and a second input terminal, the first input terminal coupled to the first input node; a second differential amplifier having a first input terminal and a second input terminal, the first input terminal coupled to the second input node; a first variable resistance having a first terminal coupled to the first input terminal of the first differential amplifier and a second terminal coupled to the second input terminal of the first differential amplifier; a second variable resistance having a first terminal coupled to the first input terminal of the second differential amplifier and a second terminal coupled to the second input terminal of the second differential amplifier; and a differential capacitor coupled between the second terminal of the first variable resistance and the second terminal of the second variable resistance.