Amplification circuit for operation in multiple gain modes

Abstract

An amplification circuit includes a signal input terminal, a signal output terminal, a first transistor, a variable impedance element, and a voltage adjustment circuit. The signal input terminal receives a radio frequency signal, and the signal output terminal outputs an amplified radio frequency signal. The first transistor has a first terminal coupled to a reference voltage terminal and a control terminal coupled to the signal input terminal. The variable impedance element is coupled between the first transistor and the signal output terminal and includes a second transistor. A first terminal of the second transistor is coupled to the first transistor, the second terminal of the second transistor is coupled to the signal output terminal, and the control terminal of the second transistor receives a bias signal. The voltage adjustment circuit is coupled to the variable impedance element to adjust the voltage at the second terminal of the second transistor.

Dependencies are inferred from the claim text.