A new method of TX leakage cancelation in W/CDMA and GPS receivers

The theory and practical implementation of a novel TX cancelation method in CDMA and GPS receivers are described. The method is similar to the continuous-time LMS algorithm, but uses the TX LO as the reference signal and low-pass filters instead of the integrators. The method was implemented as part...

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Bibliographic Details
Published in2008 IEEE Radio Frequency Integrated Circuits Symposium pp. 87 - 90
Main Author Aparin, V.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2008
Subjects
Adaptive filters
Cellular phones
Degradation
Global Positioning System
Interference
interference suppression
Least squares approximation
MOSFET amplifiers
Multiaccess communication
notch filters
Pollution measurement
Radio frequency
receivers
SAW filters
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ISBN9781424418084
1424418089
ISSN1529-2517
DOI10.1109/RFIC.2008.4561392

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Summary:The theory and practical implementation of a novel TX cancelation method in CDMA and GPS receivers are described. The method is similar to the continuous-time LMS algorithm, but uses the TX LO as the reference signal and low-pass filters instead of the integrators. The method was implemented as part of a 0.18 mum CMOS cellular-band receiver to cancel the TX leakage at the LNA input. The measured maximum rejection of the TX leakage is approximately 20 dB, the LNA NF is 1.8 dB, and the dc current consumption of the TX canceler is 4 mA.
ISBN:9781424418084
1424418089
ISSN:1529-2517
DOI:10.1109/RFIC.2008.4561392