Patent ID: 8324956

Claim:
A post-mixer amplifier device which receives and processes signals for use in a radio integrated circuit comprising: a voltage amplifier having first and second inputs and a first output; a push-pull unity gain follower having a third input and a second output, wherein the third input is connected with the first output of the voltage amplifier; a positive signal output connected with the second output of the push-pull unity gain follower; a positive signal input connected with a first switch, wherein the first switch is selectable between a first pathway and a second pathway; a first bipolar junction transistor coupled to the positive signal input via the first switch along the first pathway, the first bipolar junction transistor having a first collector connected with the first input of the voltage amplifier and a first emitter coupled to the second output of the push-pull unity gain follower via a first resistance and forming a first current feedback pathway; and a second bipolar junction transistor coupled to the positive signal input via the first switch along the second pathway, the second bipolar junction transistor having a second collector connected with the first input of the voltage amplifier and a second emitter coupled to the second output of the push-pull unity gain follower via a second resistance and forming a second current feedback pathway; wherein the first and second bipolar junction transistors each drive passive resistive loads, coupled to the second output of the push-pull unity gain follower and the positive signal output, at their respective emitters, the passive resistive loads comprising the first and the second resistances, respective.