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Fully differential operational amplifiers using CMOS compatible lateral bipolar transistors with improved common-mode regulation

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2 Author(s)
Bardyn, J.-P. ; Inst. Superieur d'Electron. du Nord, Lille, France ; Kaiser, A.

A new bias circuit for a CMOS compatible lateral bipolar transistor differential pair is presented. The circuit compensates for all process and bias dependent variations of the lateral collector current to emitter current ratio alpha . Experimental results show that its application to a fully differential amplifier improves the precision of the common-mode output voltage regulation by at least an order of magnitude.

Published in:

Electronics Letters  (Volume:26 ,  Issue: 12 )