CMOS Precision Half-Wave Rectifying Transconductor

Sibum JUN  Dae Mann KIM  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E80-A       pp.2000-2005
Publication Date: 1997/10/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Category: Analog Signal Processing
rectifier,  current subtracter,  transconductor,  analog circuit,  

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A novel CMOS half-wave rectifying transconductor is presented. The proposed circuit utilizes a simple new cascode current subtracter which is obtained from conventional cascode current mirror by a judicious reconfiguration to yield additional subtrahend signal path. The simulated DC transfer characteristics is highly linear with 1.1% linearity error up to 1.5V differential input voltage and the blunt corner at zero-crossing is 20mV. The output resistance is greater than 23MΩ and the total harmonic distortions at 100kHz with 1.5Vp-p in the positive half cycle are better than -46.5dB. The usable operating frequencies are up to 10MHz with maximum peak-to-peak input voltage and 75µW power consumption.