Patent ID: 8279008

Claim:
A low-noise amplifier (LNA), comprising: a first cascode gain stage coupled to an input node for increasing an amplitude of an RF input signal received at the input node, the first cascode gain stage including: a first transistor having a source coupled to ground and a gate coupled to the input node, and a second transistor having a source coupled to a drain of the first transistor and a drain coupled to an output node; and a first variable gain network coupled to a gate of the second transistor of the first cascode gain stage, the variable gain network including a first inductor for boosting a gain of the first cascode gain stage, a first capacitor coupled to the first inductor for blocking a direct current (DC) voltage, and third transistor coupled to the first inductor and to the first capacitor, the third transistor configured to selectively couple the first inductor to the first cascode gain stage in response to a first control signal received at a gate of the third transistor to increase an inductance at the gate of the second transistor.