A CMOS direct down-converter with outstanding dynamic range performances

Author

Brandolini, Massimo ; Rossi, Paolo ; Sanzogni, Davide ; Svelto, Francesco

Author_Institution

Dipt. di Elettronica, Universita di Pavia, Italy

fYear

2005

Firstpage

5

Lastpage

8

Abstract

The mechanisms responsible for second order inter-modulation distortion in a direct down-converter are addressed, giving rise to the following design strategy: the transconductor is degenerated by means of an RC filter with pole equal to the signal bandwidth, an LC filter resonating at RF frequency loads the switching pair and carefully matched load resistors develop voltage gain. Prototypes realized in 0.18μm CMOS show: +78dBm IIP2 minimum among 40 samples, +10dBm IIP3, 4nV/VHz input-referred noise density while burning only 4mA from 1.8V.

Keywords

CMOS integrated circuits; convertors; integrated circuit noise; intermodulation distortion; passive filters; poles and zeros; 0.18 micron; 1.8 V; 4 mA; CMOS direct down-converter; LC filter; RC filter; RF frequency load; dynamic range performance; input-referred noise density; load resistor; second order intermodulation distortion; signal bandwidth; transconductor; Bandwidth; Distortion; Dynamic range; Matched filters; RF signals; Radio frequency; Resistors; Resonant frequency; Signal design; Transconductors;

fLanguage

English

Publisher

ieee

Conference_Titel

IEEE-NEWCAS Conference, 2005. The 3rd International

Print_ISBN

0-7803-8934-4

Type

conf

DOI

10.1109/NEWCAS.2005.1496718

Filename

1496718