Effects of Mismatch on CMOS Monolithic Mixers Image Rejection.pdf

Effects of Mismatch on CMOS Monolithic Mixers Image Rejection 1 2 2 Fernando Azevedo , M. João Rosário , J. Costa Freire 1Instituto Superior de Engenharia de Lisboa, 2Instituto Superior Técnico 1,2,3Instituto de Telecomunicações, Lisboa Portugal Av. Rovisco Pais, 1096 Lisboa, Portugal Tel: +351-218418491; Fax: +351-218419341 email: fsa@isel.pt mrosario@alfa.ist.utl.pt jcostafreire@lx.it.pt Abstract — Image rejection ratio in CMOS double offsets that may be present in the double-balanced mixer of balanced mixers is strongly dependent on the balance Fig.1 are described as well as a theoretical analysis, at the between its branches. The influence of the mismatches is system level, of their influence on image rejection ratio analyzed theoretically at the system and circuit level. (IRR). Finally, guidelines for the maximum mismatch Guidelines that show the maximum acceptable mismatch to permissible to meet a given IRR specification based on meet a given image rejection ratio specification and system analysis and circuit simulation results are developed experimental results are presented. and applied to the design of a monolithic CMOS mixer for