US Patent 9407226 Gain control in complementary common gate and common source amplifiers

Gain control in complementary common gate and common source amplifiers is disclosed. In an exemplary embodiment, an apparatus includes a first amplifier stage configured to amplify an input signal at an input terminal to generate a first amplified signal. The first amplifier stage includes a current diverter that selectively diverts current to set a gain of the first amplifier stage. The apparatus also includes a second amplifier stage configured to amplify the input signal at the input terminal to generate a second amplified signal. The second amplifier stage includes a gain control circuit to set a gain of the second amplifier stage.