Title :
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
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;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2010.2049792
