CMOS mixers and polyphase filters for large image rejection

Author

Behbahani, Farbod ; Kishigami, Yoji ; Leete, John ; Abidi, Asad A.

Author_Institution

Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA

Volume

36

Issue

6

fYear

2001

fDate

6/1/2001 12:00:00 AM

Firstpage

873

Lastpage

887

Abstract

This paper presents an in-depth treatment of mixers and polyphase filters, and how they are used in rejecting the image in transmitters and receivers. A powerful phasor-based analysis is used to explain all common image-reject topologies and their limitations, and it is shown how this can replace complex trigonometric equations commonly found in the literature. Practical problems in design and layout that limit the performance of image-reject upconversion and downconversion mixers are identified, and solutions are presented or limits explained. This understanding is put to work in a low-IF CMOS wideband, low-IF downconversion circuit, which repeatedly rejects the image by 60 dB over the wide band of 3.5 to 20 MHz without trimming or calibration

Keywords

CMOS analogue integrated circuits; intermediate-frequency amplifiers; mixers (circuits); superheterodyne receivers; 3.5 to 20 MHz; CMOS mixers; downconversion mixers; image rejection; phasor-based analysis; polyphase filters; upconversion mixers; 1f noise; Active filters; Band pass filters; Image analysis; Passive filters; Radio frequency; Radio transmitters; Receivers; Signal to noise ratio; Wideband;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.924850

Filename

924850