A Very Low Power 10 MHz CMOS Continuous-Time Bandpass Filter with On-Chip Automatic Tuning

Gholamreza Zareh FATIN
Mohammad GHADAMI

IEICE TRANSACTIONS on Electronics   Vol.E89-C    No.7    pp.1089-1096
Publication Date: 2006/07/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.7.1089
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
bandpass filter,  Gm-C,  quality factor,  dynamic range,  IM3,  automatic tuning,  PLL,  

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A second-order CMOS continuous-time bandpass filter with a tuneable 4-12 MHz center frequency (fc) is presented. The Design has been done by using a new second-order block which is based on Gm-C method. This Gm-C filter achieves a dynamic range of 30 dB for 1% IM3, and Q equal to 58 at 12 MHz, while dissipating only 10.5 mW from 3.3 V power supply in 0.35 µm CMOS process. The on-chip indirect automatic tuning circuit uses a phase-locked loop which sets filter center frequency to an external reference clock.