Voltage to current converter

摘要

A voltage to current converter comprises a first long tail pair comprising transistors whose emitters are connected via equal value resistors to a constant current source. The first long tail pair forms a main transconductance stage. A subsidiary or corrector transconductance stage is connected in anti-phase with the main stage. The corrector stage is based on another long tail pair comprising transistors whose emitters are connected via resistors to another constant current source. The linear part of the transconductance of the corrector stage is substantially less than that of the main stage but the non-linear part is substantially equal to that of the main stage. Thus, non-linear distortion can be substantially reduced.