Design of a 4-MHz analog integrated CMOS transconductance-C bandpass filter

Author

Park, Chin S. ; Schaumann, Rolf

Author_Institution

Dept. of Electr. Eng., Minnesota Univ., Minneapolis, MN, USA

Volume

23

Issue

4

fYear

1988

Firstpage

987

Lastpage

996

Abstract

A continuous-time eighth-order fully integrated CMOS transconductance-C bandpass filter is presented for operation at 4 MHz with 800 kHz bandwidth and 0.5 dB pass-band ripple. A phase-locked loop for frequency tuning and four-point amplitude-locking loop for Q-factor tuning at the reflection zeros of the filter are implemented. The transfer characteristics were found to be essentially within specifications: less than 1-dB passband attenuation, 75-dB stopband attenuation and S/N ratio, and 0.5% harmonic distortion for 0.5-V/sub p-p/ signal were observed. Offset of the transconductances was internally controlled by an offset-control loop to less than 4 mV. A temperature-insensitive transconductance design and the noise characteristics of the filter building blocks are also discussed.<>

Keywords

CMOS integrated circuits; active filters; band-pass filters; linear integrated circuits; radiofrequency filters; tuning; 4 MHz; 800 kHz; CMOS; PLL; Q-factor tuning; RF type; active filters; continuous-time; eighth-order; filter building blocks; four-point amplitude-locking loop; frequency tuning; monolithic analogue IC; noise characteristics; offset-control loop; phase-locked loop; temperature-insensitive transconductance design; transconductance-C bandpass filter; transfer characteristics; Attenuation; Band pass filters; Bandwidth; Filtering theory; Frequency locked loops; Harmonic distortion; Passband; Phase locked loops; Reflection; Tuning;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.350

Filename

350