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Universal exponential function implementation using highly-linear CMOS V-I converters for dB-linear (AGC) applications

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3 Author(s)
Lin, C.-H. ; Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA ; Pimenta, T. ; Ismail, M.

A universal exponential function generator is introduced which is implemented by low-voltage (⩽3 V) low-power CMOS widely-linear-input voltage-to-current converters. The Taylor's series expansion is used for the exponential function approach. The proposed exponential circuit is composed of a V-I squarer circuit, a linear V-I converter and a constant current biasing to synthesize the second-order, the first-order and the zero-order terms in Taylor's series. In a 1.2 μm n-well CMOS process, at the entire voltage control range, the dB-linear function achieves 20 dB range, the linearity error is less than ±0.5% within 12 dB. The total power consumption is below 0.9 mW with 3V supply voltage

Published in:

Circuits and Systems, 1998. Proceedings. 1998 Midwest Symposium on

Date of Conference:

9-12 Aug 1998