Linear transfer voltage to current circuit

摘要

A differential circuit having a relatively simple structure capable of delivering a linear transfer characteristic and expanding an input dynamic range. An increase in magnitude of differential input voltage Vin applied to each gate of differential-pair MOSFETs M1 and M2 in the differential circuit decreases control voltage VCONT in a control circuit. On the other hand, since a current fed to MOSFETs M3 and M4 in the differential circuit decreases simultaneously, a current supplied to the differential-pair MOSFETs M1 and M2 in the differential circuit increases. Thus, the present invention makes it possible to effectively expand the input dynamic range with respect to differential input voltage Vin.