Accurate Constant Transconductance Generation without Off-Chip Components

A process, voltage, and temperature invariant transconductance generation technique without the use of any off-chip components is proposed. It generates transconductance by tracking an MOSFET in linear region, whose conductance is precisely controlled by negative feedback using constant voltage and current references. Simulation results of a prototype transconductor in 0.13 μm CMOS technology show an inaccuracy of less than 0.5% for 120°C variation of temperature and a deviation of ±4% with mismatch.