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A Low-Power High-Frequency All-Pass-Filter-Based Sinusoidal Quadrature OscillatorUsing CMOS Current Mirrors
Journal
UTCC Engineering Research Papers
Publisher(s)
University of the Thai Chamber of Commerce
Date Issued
2008
Author(s)
Leelasantitham, Adisorn
Other Contributor(s)
University of the Thai Chamber of Commerce. School of Engineering
Abstract
A low-power high-frequency sinusoidalquadrature oscillator is presented through the use of two allpasscurrent mirror (CM)-based filters, a 1st-order CM lowpassfilter and a CM bilinear transfer function. The bilineartransfer function is described in terms of a negative resistance(RN = -RL) where RL is a resistor load of a current mirror. Thetechnique is relatively simple based on (i) inherent timeconstants of current mirrors, i.e. the internal capacitances andthe transconductance of a diode-connected NMOS, (ii) a simplenegative resistance RN formed by a resistor load RL of acurrent mirror. Neither external capacitances nor inductancesare required. As a particular example, a 1.01-GHz, 0.6-mW, 2-V CMOS all-pass-filter-based all-current-mirror sinusoidalquadrature oscillator is demonstrated in this paper. Theoscillation frequency (f0) is 1.01 GHz and is current-tunableover a range of 400 MHz or 40 %. The power consumption isat approximately 0.6 mW. The amplitude matching and thequadrature phase matching are better than 0.05 dB and 0.15°,respectively. Total harmonic distortions (THD) are less than0.5 %. At 2 MHz offset from the 1.01 GHz, the carrier to noiseratio (CNR) is 83.01 dBc/Hz whilst the figure of merit called anormalized carrier-to-noise ratio (CNRnorm) is 139.29 dBc/Hz.The ratio of the oscillation frequency (f0) to the unity-gainfrequency (fT) of a transistor is 0.134.
Subject(s)
ISSN
1906-1625
Access Rights
public
Rights
This work is protected by copyright. Reproduction or distribution of the work in any format is prohibited without written permission of the copyright owner.
Rights Holder(s)
University of the Thai Chamber of Commerce
Bibliographic Citation
A. Leelasantitham, B. Srisuchinwong (2008) A Low-Power High-Frequency All-Pass-Filter-Based Sinusoidal Quadrature OscillatorUsing CMOS Current Mirrors. UTCC Engineering Research Papers.
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