FEEDBACK-TUNING BASED VARIABLE GAIN AMPLIFIER

This disclosure is directed to an amplifier (e.g., a variable gain amplifier (VGA)) with improved linearity compared to other amplifiers. The amplifier may include degeneration inductors and a tunable degeneration resistor to generate amplified signals. The degeneration inductors and the tunable degeneration resistor may form a resonant circuit to improve linearity of the amplified signal at a desired frequency by reducing direct current (DC) components and harmonic components of the amplified signal having the desired frequency. Moreover, the amplifier may also generate the amplified signals with improved linearity at back-off output powers based on using the tunable degeneration resistor and the degeneration inductors. As such, the amplifier may include the degeneration inductors and the tunable degeneration resistor to generate the amplified signals having an output power across a range of output powers, such as a peak output power and one or multiple back-off output powers, with improved linearity.