Patent ID: 7057457

Claim:
A low-noise amplifier circuit, comprising: a signal input for receiving a radio-frequency signal; a signal output for providing an amplified signal which is derived from the radio-frequency signal; a first current path coupled between the signal input and the signal output, said first current path including a first transistor connected in a common-base circuit; a second current path coupled between the signal input and the signal output, said second current path including a second transistor connected in a common-emitter circuit, the second transistor having a collector and a base, and including a feedback path coupled between the collector and the base of the second transistor; a third transistor connected in a common-base circuit; a resistor coupled between the collector of the second transistor and an emitter of the third transistor; and a switching device comprises a plurality of switches for selectively activating one of the first and second current paths as a function of a desired gain.