Comments on "Bandpass Sigma-Delta Modulator Employing SAW Resonator as Loop Filter

Author

Dutta Roy, Suhash C.

Author_Institution

Dept. of Electr. Eng., Indian Inst. of Technol., New Delhi

Volume

55

Issue

4

fYear

2008

fDate

5/1/2008 12:00:00 AM

Firstpage

1172

Lastpage

1175

Abstract

Some corrections needed in the theoretical analysis of the surface acoustic wave resonator loop filter for a bandpass sigma-delta modulator, as presented by Yu and Xu, are pointed out. A simple idea is also proposed for perfect cancellation of anti-resonance without substantially affecting the resonance frequency, but with the added benefits of an enhanced factor and insertion gain, rather than insertion loss. However, a practical implementation of the idea remains an open question.

Keywords

band-pass filters; sigma-delta modulation; surface acoustic wave resonator filters; SAW resonator loop filter; anti-resonance cancellation; bandpass sigma-delta modulator; enhanced factor; insertion gain; surface acoustic wave resonator; Acoustic waves; Band pass filters; Capacitance; Delta-sigma modulation; Insertion loss; Resonance; Resonant frequency; Resonator filters; Surface acoustic waves; Transfer functions; Bandpass filter; Surface acoustic wave (SAW) resonator; band-pass filter; perfect cancellation; surface acoustic wave (SAW) resonator;

fLanguage

English

Journal_Title

Circuits and Systems I: Regular Papers, IEEE Transactions on

Publisher

ieee

ISSN

1549-8328

Type

jour

DOI

10.1109/TCSI.2008.916615

Filename

4436209