Circuit with substantially constant transconductance has means to polarise MOS transistors with current which varies with temperature to compensate the change in mobility of holes and electrons

摘要

The transconductance cell (100) consists of two MOS transistors (M1,M1') which are connected through a load (300) and a polarising circuit (200) to potentials (20,21). The polarising circuit uses a current mirror (2.1) and tuned circuit (2.2) to produce a polarising current which varies with temperature such that the temperature variation of the holes or electrons in the transistor channels is compensated