Patent ID: 8723599

Claim:
An adjustable gain amplifier system having cleanly adjustable and stable linearized gain for amplifying an input signal in amplitude comprising: a main amplifier; and, a linearized transconductance amplifier coupled to said main amplifier, said linearized transconductance amplifier generating an amplified current signal in response to the input signal according to a transconductance factor variably defined therefor, said linearized transconductance amplifier including: a linearized transconductance portion generating an intermediate current signal based upon a voltage of the input signal, said linearized transconductance portion forming an unswitched resistor-based conduction path through a reference resistance for said intermediate current signal; and, a translinear current amplifier portion coupled to said linearized transconductance portion, said translinear current amplifier portion forming a translinear loop section for amplifying said intermediate current signal to generate said amplified current signal, said translinear current amplifier portion being selectively reconfigurable to correspondingly adjust said transconductance factor; wherein the linearized gain is adjustably defined according to said adjusted transconductance factor.