I/Q Mismatch Compensation Using Adaptive Decorrelation in a Low-IF Receiver in 90-nm CMOS Process

Autor:	Poras T. Balsara, Imtinan Elahi, Khurram Muhammad
Rok vydání:	2006
Předmět:	Engineering business.industry Electrical engineering Image response Channel capacity Direct-conversion receiver Narrowband Intermediate frequency Low IF receiver Electronic engineering Electrical and Electronic Engineering Transceiver business Decorrelation
Zdroj:	IEEE Journal of Solid-State Circuits. 41:395-404
ISSN:	0018-9200
Popis:	We present a single multiplier based adaptive I/Q mismatch compensation circuit for narrowband quadrature receivers. Adaptive decorrelation between I and Q channel data is used for correcting gain and phase mismatches. Adaptation step size is computed from L/sub 1/-norm inverse power measurement and a gear-shifting mechanism is used that allows fast initial convergence and slow adaptation on actual burst data. Image rejection ratio in excess of 50 dB is reported for GSM receiver after compensation allowing the receiver to use IF frequencies higher than half of the channel bandwidth. The presented mismatch compensation circuit is implemented as part of a single-chip GSM wireless transceiver fabricated in a 90-nm digital CMOS process. The presented techniques are, however, equally applicable to other narrowband packet-based applications.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5df46700d29d21590ab556742982f07a https://doi.org/10.1109/jssc.2005.862353 Zobrazit plný text záznamu