An Active Transmitter Leakage Suppression Technique for CMOS SAW-Less CDMA Receivers

Author

Khatri, Himanshu ; Gudem, Prasad S. ; Larson, Lawrence E.

Author_Institution

Qualcomm Inc., San Diego, CA, USA

Volume

45

Issue

8

fYear

2010

Firstpage

1590

Lastpage

1601

Abstract

A CDMA-2000 receiver without interstage RF SAW filter is presented. An active bandpass sink filter is proposed to selectively filter the transmitted leakage after the downconversion mixer. The impact on receiver noise and linearity performances is discussed. This technique improves the triple-beat (TB) and IIP2 of the receivers by 6.5 dB each, at the expense of a small increase in DC current and noise. Designed in 0.18 μm CMOS technology, the receiver achieves 45 dB gain with uncalibrated IIP₂ of +46 dBm and triple-beat of 69 dB.

Keywords

CMOS integrated circuits; active filters; band-pass filters; code division multiple access; interference suppression; mixers (circuits); receivers; transmitters; CDMA-2000 receiver; CMOS SAW-less CDMA receivers; CMOS technology; IIP2; active bandpass sink filter; active transmitter leakage suppression technique; downconversion mixer; gain 45 dB; gain 46 dB; gain 69 dB; receiver noise; size 0.18 mum; transmitted leakage filtering; triple-beat; Acoustic waves; Band pass filters; CMOS technology; Frequency conversion; Multiaccess communication; Passive filters; Radio frequency; SAW filters; Surface acoustic waves; Transmitters; CDMA2000 receiver; CMOS integrated circuits; direct conversion; low-noise amplifier (LNA); passive mixer; surface acoustic wave (SAW) filter;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.2010.2049792

Filename

5518495