An accurate automatic tuning scheme for high-Q continuous-time bandpass filters based on amplitude comparison

Author

Liu, Hengsheng ; Karsilayan, Aydin Ilker

Author_Institution

Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA

Volume

50

Issue

8

fYear

2003

Firstpage

415

Lastpage

423

Abstract

A new automatic tuning scheme for continuous-time high-Q bandpass filters is presented. It is conducted by amplitude comparison at three frequencies generated by an on-chip frequency synthesizer. Theoretical analysis and experimental results are provided. Analysis shows the tuning method is suitable for bandpass filters with Q>10. A g_m-C second-order filter is designed to demonstrate the proposed tuning scheme. The test chip is fabricated in AMI 0.5 μm process. The measured frequency tuning error is 0.25%, and Q-tuning error is 3% for a 200 MHz filter with a desired Q of 28.6.

Keywords

CMOS integrated circuits; Q-factor; band-pass filters; circuit tuning; continuous time filters; frequency synthesizers; mixed analogue-digital integrated circuits; 0.5 micron; 150 to 210 MHz; 200 MHz; 3 V; 35 mW; AMI process; CMOS IC; active filters; automatic tuning scheme; clock generator; continuous-time filters; frequency divider; g_m-C second-order filter; high-Q bandpass filters; on-chip frequency synthesizer; tuning method; Ambient intelligence; Band pass filters; Circuit optimization; Circuit testing; Detectors; Error correction; Frequency synthesizers; Gain control; Q factor; Tuning;

fLanguage

English

Journal_Title

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/TCSII.2003.814802

Filename

1220775