VARIABLE GAIN AMPLIFIER WITH SUBTHRESHOLD BIASING

This disclosure is directed to reducing output voltage distortions of Variable Gain Amplifiers (VGAs). A VGA (100) may include a number of amplifiers (102, 104, 106) each providing a portion of a total gain of the VGA (100). For example, a processing circuit may select one or more of the amplifiers (102, 104, 106) of the VGA (100) to provide the output signal with a selected gain. However, the selected amplifiers may provide amplified signals with one or more distortion signals when receiving a bias voltage. Systems and methods are described to reduce or cancel the distortion signals of the selected amplifiers by providing a subthreshold nonzero bias voltage , e.g., a weak voltage (VST), to the remaining, e.g., non-selected, amplifiers of the VGA (100). For example, the non-selected amplifiers may receive the weak voltage (VST) to provide distortion signals with similar voltage amplitude and out of phase compared to the distortion signals of the selected amplifiers.