Universal exponential function implementation using highly-linear CMOS V-I converters for dB-linear (AGC) applications
作者： Chi-Hung Lin , T. Pimenta , M. Ismail
DOI: 10.1109/MWSCAS.1998.759506
关键词: Voltage 、 CMOS 、 Series expansion 、 Constant current 、 Exponential function 、 Automatic gain control 、 Low-power electronics 、 Mathematics 、 Taylor series 、 Electrical engineering
摘要: A universal exponential function generator is introduced which implemented by low-voltage (/spl les/3 V) low-power CMOS widely-linear-input voltage-to-current converters. The Taylor's series expansion used for the approach. proposed circuit composed of a V-I squarer circuit, linear converter and constant current biasing to synthesize second-order, first-order zero-order terms in series. In 1.2 /spl mu/m n-well process, at entire voltage control range, dB-linear achieves 20 dB linearity error less than plusmn/0.5% within 12 dB. total power consumption below 0.9 mW with 3V supply voltage.
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