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A High-Frequency Low-Power Low-Pass-Filter-Based All-Current-Mirror Sinusoidal Quadrature Oscillator
Journal
UTCC Engineering Research Papers
Publisher(s)
University of the Thai Chamber of Commerce
Date Issued
2006
Author(s)
Leelasantitham, Adisorn
Other Contributor(s)
University of the Thai Chamber of Commerce. School of Engineering
Abstract
A high-frequency low-power sinusoidal quadratureoscillator is presented through the use of two 2nd-order low-passcurrent-mirror (CM)-based filters, a 1st-order CM low-pass filter anda CM bilinear transfer function. The technique is relatively simplebased on (i) inherent time constants of current mirrors, i.e. theinternal capacitances and the transconductance of a diode-connectedNMOS, (ii) a simple negative resistance RN formed by a resistor loadRL of a current mirror. Neither external capacitances nor inductancesare required. As a particular example, a 1.9-GHz, 0.45-mW, 2-VCMOS low-pass-filter-based all-current-mirror sinusoidal quadratureoscillator is demonstrated. The oscillation frequency (f0) is 1.9 GHzand is current-tunable over a range of 370 MHz or 21.6 %. Thepower consumption is at approximately 0.45 mW. The amplitudematching and the quadrature phase matching are better than 0.05 dBand 0.15°, respectively. Total harmonic distortions (THD) are lessthan 0.3 %. At 2 MHz offset from the 1.9 GHz, the carrier to noiseratio (CNR) is 90.01 dBc/Hz whilst the figure of merit called anormalized carrier-to-noise ratio (CNRnorm) is 153.03 dBc/Hz. Theratio of the oscillation frequency (f0) to the unity-gain frequency (fT)of a transistor is 0.25. Comparisons to other approaches are alsoincluded.
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 (2006) A High-Frequency Low-Power Low-Pass-Filter-Based All-Current-Mirror Sinusoidal Quadrature Oscillator. UTCC Engineering Research Papers.
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