An integrated quadrature mixer with improved image rejection at low voltage

J. Harvey, Ramesh Harjani

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations

Abstract

A new quadrature mixer based on the CMOS Gilbert mixer has been proposed. Analytical formulae have been derived for the conversion gain and noise of the proposed mixer. Simulations show a 10 dB improvement in image rejection versus a pair of Gilbert mixers, for low LO amplitudes as are increasingly required by low supply voltages. The proposed quadrature mixer exhibits the same linearity and conversion gain as a pair of simple Gilbert mixers, for the same power and input capacitance. The quadrature mixer can be designed to exhibit a noise advantage over a pair of Gilbert mixers, through proper relative sizing of the mixer core and transconductor transistors. A test chip containing the quadrature mixer and a Gilbert mixer has been fabricated, and the performances of the mixers are being measured.

Original languageEnglish (US)
Title of host publicationProceedings of the IEEE International Conference on VLSI Design
Pages269-273
Number of pages5
StatePublished - Jan 1 2001
Event14th International Conference on VLSI Design (VLSI DESIGN 2001) - Bangalore, India
Duration: Jan 3 2001Jan 7 2001

Other

Other14th International Conference on VLSI Design (VLSI DESIGN 2001)
CountryIndia
CityBangalore
Period1/3/011/7/01

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