DocumentCode :
2257981
Title :
A novel mismatch cancellation and I/Q channel multiplexing scheme for quadrature bandpass ΔΣ modulators
Author :
Li, Bing ; Chan, Cheong-Fat ; Pun, Kong-Pang ; Choy, Chiu-Sing
Author_Institution :
Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Hong Kong, China
fYear :
2009
fDate :
24-27 May 2009
Firstpage :
1545
Lastpage :
1548
Abstract :
This paper investigates and resolves in-channel/quadrature channel (I/Q) imbalances in quadrature band pass delta sigma modulators. These mismatches result in image interference and noise being aliased into the desired signal band, thus degrading the dynamic range of the modulators. A novel dynamic element match shaping scheme is proposed to cancel the aliasing of image interference, noise, and self-image. The simulation results for the proposed scheme show that the SNDR is only degraded by 1.6 dB from the ideal case (without I/Q mismatch). Meanwhile, using the I/Q channel multiplexing technique, operational amplifiers, quantizers, and digital-analog converters can be shared between I/Q channels. As a result, silicon area can be reduced with the same power consumption.
Keywords :
delta-sigma modulation; image coding; interference suppression; multiplexing; I/Q channel multiplexing scheme; delta sigma modulators; dynamic element match shaping scheme; image interference; image quantisation; in-channel/quadrature channel imbalances; mismatch cancellation; noise aliasing; power consumption; quadrature bandpass DeltaSigma modulators; Degradation; Delta-sigma modulation; Digital-analog conversion; Dynamic range; Interference cancellation; Multi-stage noise shaping; Noise cancellation; Operational amplifiers; Signal resolution; Silicon;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems, 2009. ISCAS 2009. IEEE International Symposium on
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-3827-3
Electronic_ISBN :
978-1-4244-3828-0
Type :
conf
DOI :
10.1109/ISCAS.2009.5118063
Filename :
5118063
Link To Document :
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