Title :
Analysis of LO leakage due to LO mismatch in CMOS Gilbert mixer for direct conversion application
Author :
Liu, J.J. ; Do, M.A. ; Ma, J.-G. ; Yeo, K.S.
Author_Institution :
Centre for Integrated Circuits & Syst., Nanyang Technol. Univ.
Abstract :
The DC offset caused by the LO-RF feedthrough in the mixer of a direct conversion receiver is a serious problem. The LO leakage caused by the LO mismatch in double-balanced CMOS Gilbert mixers is examine and analyzed in four cases, no LO mismatch, LO phase mismatch only, LO amplitude mismatch only and the combination of the two mismatches. The relation between the mismatch and the LO leakage is derived. Simulation results shown are consistent with the analysis
Keywords :
CMOS integrated circuits; UHF mixers; radiofrequency oscillators; DC offset; LO amplitude mismatch; LO leakage; LO phase mismatch; LO-RF feedthrough; direct conversion receiver; double-balanced CMOS Gilbert mixers; Analytical models; Application specific integrated circuits; Baseband; CMOS technology; Capacitors; DC generators; Integrated circuit technology; Modulation; Switches; Switching circuits;
Conference_Titel :
Circuits and Systems, 2004. Proceedings. The 2004 IEEE Asia-Pacific Conference on
Conference_Location :
Tainan
Print_ISBN :
0-7803-8660-4
DOI :
10.1109/APCCAS.2004.1412753
