Title :
CMOS monolithic wideband image rejection mixer with polyphase filters
Author :
Azevedo, Fernando ; Rosario, Maria Joao ; Freire, Joao Costa
Author_Institution :
Instituto Superior de Engenharia de Lisboa, Portugal
Abstract :
The image rejection ratio in double balanced mixers is strongly dependent on the balance between its branches. The influence of mismatches is analysed and conclusions on the key aspects of the design to increase the image rejection are discussed. A practical circuit implementation is described: a 1.9 GHz downconversion image rejection mixer is fabricated in 0.6 μm CMOS standard technology. Measurements on the prototype showed a 34 dB image rejection and an overall conversion gain of 16 dB.
Keywords :
CMOS analogue integrated circuits; UHF filters; UHF mixers; integrated circuit design; 0.6 micron; 1.9 GHz; 16 dB; CMOS mixer; conversion gain; double balanced mixers; downconversion image rejection mixer; image rejection ratio; monolithic wideband image rejection mixer; polyphase filters; CMOS technology; Circuits; Frequency conversion; Image converters; Local oscillators; Low pass filters; Mixers; Radio frequency; Transceivers; Wideband;
Conference_Titel :
Microwave and Optoelectronics Conference, 2003. IMOC 2003. Proceedings of the 2003 SBMO/IEEE MTT-S International
Print_ISBN :
0-7803-7824-5
DOI :
10.1109/IMOC.2003.1242684
