Patent ID: 7612616

Claim:
A low-noise amplifier comprising: an input matching network; a first amplifier stage having an input end and an output end, the input end being connected to the input matching network, the first amplifier stage having an input impedance in conjugate matching relation with the impedance of the input matching network; a second amplifier stage having an input end and an output end; a first inter-stage matching network connected to the output end of the first amplifier stage and the input end of the second amplifier stage, to form a conjugate matching relation between the output impedance of the first amplifier stage and the input impedance of the second amplifier stage; a third amplifier stage having an input end and an output end; a second inter-stage matching network connected to the output end of the second amplifier stage and the input end of the third amplifier stage, to form a conjugate matching relation between the output impedance of the second amplifier stage and the input impedance of the third amplifier stage; and an output matching network connected to the output end of the third amplifier stage.