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

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

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 str...

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Veröffentlicht in:IEEE journal of solid-state circuits 1994-05, Vol.29 (5), p.601-610
Hauptverfasser: Chong-Gun Yu, Geiger, R.L.
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
Automatic control
Circuit testing
CMOS process
Electronics
Exact sciences and technology
Integrated circuits
Integrated circuits by function (including memories and processors)
Mirrors
Operational amplifiers
Resistors
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Switches
Temperature control
Variable structure systems
Voltage
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Beschreibung
Zusammenfassung: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 /spl mu/m n-well CMOS process. The measured offset voltages of the test circuits are less than 400 /spl mu/V in magnitude.< >
ISSN:0018-9200
1558-173X
DOI:10.1109/4.284713