Patent ID: 8441318

Claim:
A push-pull low noise amplifier (LNA), comprising: at least one amplifier block, each amplifier block comprising: a bypass stage, having a first node and a second node; and at least one gain cell, having an input terminal and an output terminal, comprising: a loading stage, having an output node coupled to the output terminal, a first node coupled to the first node of the bypass stage and a second node coupled to the second node of the bypass stage; and a driving stage, having an input node coupled to the input terminal, a first driving node coupled to the first node of the loading stage and a second driving node coupled to the second node of the loading stage; wherein when the push-pull LNA is in a first gain mode, the loading stage is enabled and the bypassing stage is disabled; and when the push-pull LNA is in a second gain mode, the loading stage is disabled and the bypassing stage is enabled.