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A programmable piecewise linear large-signal CMOS amplifier

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2 Author(s)
Thomsen, A. ; Microelectron. Res. Center, Georgia Inst. of Technol., Atlanta, GA, USA ; Brooke, M.A.

A high-speed CMOS piecewise linear approximation circuit is presented that can be programmed for correction of nonlinearity after fabrication. The basic building block generates a linear segment, for which slope and position can be adjusted. Adjustments to adapt to arbitrary functions are done with floating gate devices fabricated in standard CMOS technology. The circuit is a voltage-to-current converter with an input range of the full power-supply voltage swing. In an implementation with 18 linear segments less than 0.15% error over rail-to-rail input range was achieved for a linear transfer function. Examples of strongly nonlinear transfer functions approximated to 0.5% accuracy are shown. The large-signal 3-dB frequency is 10 MHz. The implementations are done solely with 2-μm channel length devices

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:28 ,  Issue: 1 )

Date of Publication:

Jan 1993

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