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A Precision CMOS Amplifier Using Floating-Gate Transistors for Offset Cancellation

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4 Author(s)
Srinivasan, V. ; Texas Instruments Inc., Dallas, TX ; Serrano, G.J. ; Gray, J. ; Hasler, P.

A long-term offset cancellation scheme that enables continuous-time amplifier operation is described. Offset cancellation is achieved by programming floating-gate transistors that form an integral part of the amplifier's architecture. The offset voltage of a single-stage folded cascode amplifier has been programmed to a minimum of plusmn25 muV in a 0.5 mum digital CMOS process. The long-term offset voltage drift has been calculated to be less than 0.5 muV over a period of 10 years at 55degC from a thermionic emission model for floating-gate charge loss. The offset voltage varies by a maximum of 130 muV over a temperature range of 170degC, thereby making this a viable approach to offset cancellation

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:42 ,  Issue: 2 )

Date of Publication:

Feb. 2007

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