An integrated quadrature mixer with improved image rejection at low voltage

Author

Harvey, Jackson ; Harjani, Ramesh

Author_Institution

Dept. of Electr. Eng., Minnesota Univ., Minneapolis, MN, USA

fYear

2001

fDate

2001

Firstpage

269

Lastpage

273

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

Keywords

CMOS analogue integrated circuits; analogue integrated circuits; integrated circuit noise; mixers (circuits); 10 dB improvement; CMOS Gilbert mixer; Gilbert mixers; conversion gain; image rejection; integrated quadrature mixer; linearity; mixer core; noise; relative sizing; test chip; transconductor transistors; Baseband; Filters; Image converters; Low voltage; Mixers; RF signals; Radio frequency; Radio transmitters; Signal processing; Transconductors;

fLanguage

English

Publisher

ieee

Conference_Titel

VLSI Design, 2001. Fourteenth International Conference on

Conference_Location

Bangalore

ISSN

1063-9667

Print_ISBN

0-7695-0831-6

Type

conf

DOI

10.1109/ICVD.2001.902672

Filename

902672