Abstract

A technique is presented for obtaining an extended g/sub m/ (transconductance) adjustment range and linearization in a CMOS OTA (operational transconductance amplifier) via electronically programmable current mirrors. The mirrors include two outputs for each differential-current input, and the gain at each output may be varied independently. A current differencing technique then results in an overall g/sub m/ for the OTA which is proportional to the mirror gain difference. At the same time, the current differencing works to cancel nonlinearities in the transconductance signal. Experimental measurements of a transistor array implementation verify the extended adjustment/linearization technique. >

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