Switched-capacitor bandpass decimator for high-frequency narrowband channel filtering and downconversion

Author

Santos, P.J. ; Franca, J.E.

Author_Institution

Center for MicroSyst., Inst. Superior Tecnico, Lisbon, Portugal

Volume

1

fYear

1996

fDate

12-15 May 1996

Firstpage

405

Abstract

A subsampled two-stage switched-capacitor (SC) narrowband bandpass decimator is proposed to simultaneously implement the functions of frequency downconversion and narrowband filtering. In order to downconvert a 25 kHz bandwidth signal from 21.4 MHz down to 455 KHz, as required in many radio receivers, the proposed structure comprises a multinotch FIR decimator section followed by a 6th order bandpass IIR decimator section. Since no external components are required, the proposed structure is adequate for co-integration with baseband digitization and signal processing circuitry in CMOS technology

Keywords

CMOS analogue integrated circuits; FIR filters; IIR filters; active filters; band-pass filters; frequency convertors; notch filters; switched capacitor filters; 21.4 MHz; 25 kHz; 455 kHz; CMOS technology; bandpass IIR decimator; baseband digitization; frequency downconversion; high-frequency narrowband channel filtering; multinotch FIR decimator; radio receivers; signal processing circuitry; switched-capacitor bandpass decimator; Band pass filters; Bandwidth; Baseband; CMOS technology; Filtering; Finite impulse response filter; Frequency; IIR filters; Narrowband; Receivers;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1996. ISCAS '96., Connecting the World., 1996 IEEE International Symposium on

Conference_Location

Atlanta, GA

Print_ISBN

0-7803-3073-0

Type

conf

DOI

10.1109/ISCAS.1996.539970

Filename

539970