a translinear variable - gain amplifier . the translinear variable gain amplifier receives a differential input voltage and produces a differential output current having a selected gain . the amplifier comprises a buffer amplifier that receives the differential input voltage and produces a differential input current . the amplifier further comprises a translinear gain cell coupled to receive the differential input current and produce the differential output current . the gain cell includes a first adjustable bias source that operates to set a linear input range of the gain cell , and a second adjustable bias source that operates to set a gain value of the gain cell .