An integrated LMS adaptive filter of TX leakage for CDMA receiver front ends

The theory and practical implementation of an adaptive filter of the TX leakage in CDMA receivers are described. The filter uses a continuous-time signa-data LMS algorithm. It was designed as part of a 0.25 /spl mu/m CMOS cellular-band receiver. It achieved the maximum rejection of the TX leakage of...

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Bibliographic Details
Published in2005 IEEE Radio Frequency integrated Circuits (RFIC) Symposium - Digest of Papers pp. 229 - 232
Main Authors Aparin, V., Ballantyne, G., Persico, C., Cicalini, A.
Format Conference Proceeding
LanguageEnglish
Published IEEE 2005
Subjects
Adaptive filters
Degradation
Interference
Laplace equations
Least squares approximation
Matched filters
Multiaccess communication
Radio frequency
SAW filters
Transfer functions
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ISBN9780780389830
0780389832
ISSN1529-2517
DOI10.1109/RFIC.2005.1489640

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Summary:The theory and practical implementation of an adaptive filter of the TX leakage in CDMA receivers are described. The filter uses a continuous-time signa-data LMS algorithm. It was designed as part of a 0.25 /spl mu/m CMOS cellular-band receiver. It achieved the maximum rejection of the TX leakage of 28-30 dB, which was limited by the reference signal leakage to the LNA output. The LNA NF and gain degraded by 1.3 dB and 1.7 dB respectively after adding the filter.
ISBN:9780780389830
0780389832
ISSN:1529-2517
DOI:10.1109/RFIC.2005.1489640