High-frequency fully-tuned CMOS transconductance-C filter

Author

Park, C.-S. ; Schaumann, R.

Author_Institution

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

fYear

1988

fDate

7-9 June 1988

Firstpage

2161

Abstract

The improved design and evaluation of a continuous-time eight-order fully integrated CMOS transconductance-C bandpass filter for operation at 4 MHz are presented. A PLL (phase-locked loop) for frequency-tuning and a 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 75 dB stopband attenuation and S/N (signal-to-noise) ratio and 0.5% harmonic distortion for 0.5 V/sub pp/ signal were observed. Offset of the transconductances was internally controlled by an offset-control loop to less than 4 mV.<>

Keywords

CMOS integrated circuits; active filters; band-pass filters; linear integrated circuits; 4 MHz; CMOS transconductance-C bandpass filter; PLL; Q-factor-tuning; S/N ratio; active filter; continuous time HF filter; design; four-point amplitude-locking loop; frequency-tuning; harmonic distortion; reflection zeros; stopband attenuation; transconductance offset; transfer characteristics; Band pass filters; Circuits; Detectors; Frequency; Master-slave; Nonlinear filters; Phase locked loops; Quantum cascade lasers; Reflection; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1988., IEEE International Symposium on

Conference_Location

Espoo, Finland

Type

conf

DOI

10.1109/ISCAS.1988.15371

Filename

15371