Title :
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
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;
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
DOI :
10.1109/ISCAS.1996.539970
