Abstract:
This paper describes a new circuit of a
temperature-compensated CMOS current reference. The
temperature dependency of the output current has been
compensated by the addition of two currents which have
exactly opposite temperature dependencies. Using a simple
circuit, an appreciably low value of temperature drift of the
output current has been obtained. The operation principle of
the circuit has been described and the performance has been
observed through computer simulations. The technology used is
UMC 0.18μM with supply voltage of 1V. The current reference
shows a temperature drift of 190ppm/0C in the temperature
range of -400C to +1200C with a minimal power consumption of
80μW. This current reference can be used in some consumer
systems like video & image processing, signal processing
applications, RF circuits etc.