Title :
Asymmetric DC Offsets and IIP2 in the Presence of LO Leakage in a Wireless Receiver
Author :
Elahi, Imtinan ; Muhammad, Khurram
Author_Institution :
Texas Instrum. Inc., Dallas
Abstract :
We present mathematical analysis to prove that LO leakage at the input of RF circuits in the presence of finite IIP3 results in asymmetry in DC offsets and IIP2 between in-phase and quadrature channels in a wireless receiver. The asymmetry in IIP2 causes effective IIP2 of the receiver to be at best only 3 dB higher than the smaller of two IIP2 values. Measurement data from a quad-band GSM/GPRS receiver implemented in 90-nm digital CMOS process is also presented to support mathematical analysis.
Keywords :
CMOS integrated circuits; cellular radio; mathematical analysis; packet radio networks; radio receivers; RF circuits; asymmetric DC offsets; digital CMOS process; mathematical analysis; quadband GSM-GPRS receiver; quadrature channels; wireless receiver; CMOS process; Circuits; Clocks; Distortion measurement; GSM; Ground penetrating radar; Low pass filters; Mathematical analysis; Radio frequency; Receivers; Circuits; frequency; intermodulation distortion; mixers; radio receivers;
Conference_Titel :
Radio Frequency Integrated Circuits (RFIC) Symposium, 2007 IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
1-4244-0530-0
Electronic_ISBN :
1529-2517
DOI :
10.1109/RFIC.2007.380890
