Title :
Universal exponential function implementation using highly-linear CMOS V-I converters for dB-linear (AGC) applications
Author :
Lin, Chi-Hung ; Pimenta, Tales ; Ismail, Mohammed
Author_Institution :
Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA
Abstract :
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
Keywords :
CMOS analogue integrated circuits; automatic gain control; convertors; integrated circuit design; low-power electronics; 0.9 mW; 1.2 micron; 3 V; AGC; Taylor´s series expansion; V-I squarer circuit; constant current biasing; dB-linear applications; exponential function approach; highly-linear CMOS V-I converters; linear V-I converter; linearity error; low-power CMOS; n-well CMOS process; total power consumption; universal exponential function implementation; widely-linear-input voltage-to-current converters; CMOS analog integrated circuits; CMOS digital integrated circuits; CMOS process; CMOS technology; Circuit synthesis; Circuit topology; Polynomials; Taylor series; Very large scale integration; Voltage;
Conference_Titel :
Circuits and Systems, 1998. Proceedings. 1998 Midwest Symposium on
Conference_Location :
Notre Dame, IN
Print_ISBN :
0-8186-8914-5
DOI :
10.1109/MWSCAS.1998.759506
