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An automatic offset compensation scheme with ping-pong control for CMOS operational amplifiers

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2 Author(s)
Chong-Gun Yu ; Dept. of Electr. Eng. & Comput. Eng., Iowa State Univ., Ames, IA, USA ; Geiger, R.L.

An automatic offset compensation scheme for CMOS operational amplifiers is presented. Offset is reduced by digitally adjusting the bias voltage of a programmable current mirror which is used as the load of the differential input stage. A 100% operating duty cycle is obtained by using a ping-pong structure. The offset compensation scheme is inherently time and temperature stable since the offset compensation is periodically performed with the ping-pong control. The proposed circuit has been fabricated using a 1.0 μm n-well CMOS process. The measured offset voltages of the test circuits are less than 400 μV in magnitude

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:29 ,  Issue: 5 )