An accurate automatic tuning scheme for high-Q continuous-time bandpass filters based on amplitude comparison
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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 gm - C second-order filter is designed to demonstrate the proposed tuning scheme. The test chip is fabricated in AMI 0.5-m 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.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-ANALOG AND DIGITAL SIGNAL PROCESSING
author list (cited authors)
Liu, H. S., & Karsilayan, A. I.
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