Pre- and postfiltering effects on SCF stopband attenuation

Author

Hirano, Satoshi ; Hayahara, Etsuro

Author_Institution

Dept. of Electr. & Comput. Eng., Nagoya Inst. of Technol., Japan

Volume

38

Issue

5

fYear

1991

fDate

5/1/1991 12:00:00 AM

Firstpage

547

Lastpage

551

Abstract

The switched capacitor filter (SCF) design procedure for the case when the oversampling ratio of the sampling frequency to the cutoff frequency is not much greater than 1 is proposed. The resulting filter yields a larger stopband attenuation than that traditional elliptic filter, and it compensates for the effect of the undesirable zero-order sample-and-hold. The design procedure increases the requirement of wideband signal processing, and it helps to design filters with low oversampling rates. Though the all-pole Butterworth-type transfer functions are used, the Chebyshev type or elliptic filter can be designed with little modification of the proposed procedure

Keywords

network synthesis; poles and zeros; switched capacitor filters; transfer functions; Chebyshev type; SC filters; all-pole Butterworth-type; cutoff frequency; design procedure; elliptic filter; finite loss poles; oversampling ratio; postfiltering effects; prefiltering effects; sampling frequency; stopband attenuation; switched capacitor filter; transfer functions; wideband signal processing; Attenuation; Capacitors; Chebyshev approximation; Cutoff frequency; Filters; Signal design; Signal processing; Signal sampling; Transfer functions; Wideband;

fLanguage

English

Journal_Title

Circuits and Systems, IEEE Transactions on

Publisher

ieee

ISSN

0098-4094

Type

jour

DOI

10.1109/31.76492

Filename

76492