Accurate SI filters using RGC integrators

The design and implementation of single-ended and fully-differential switched current (SI) biquadratic high-Q bandpass filters to meet the specifications of the dual-tone multiple-frequency (DTMF) system are presented. Both designs use the regulated-gate cascode (RGC) dynamic current mirror to obtai...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 1994-11, Vol.29 (11), p.1388-1395
Main Authors: Goldenberg, M., Croman, R., Fiez, T.S.
Format: Article
Language:English
Subjects:
Band pass filters
Circuit testing
CMOS process
Frequency
Mirrors
Operational amplifiers
Parasitic capacitance
Switched capacitor circuits
Switching circuits
Voltage
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Summary:The design and implementation of single-ended and fully-differential switched current (SI) biquadratic high-Q bandpass filters to meet the specifications of the dual-tone multiple-frequency (DTMF) system are presented. Both designs use the regulated-gate cascode (RGC) dynamic current mirror to obtain center frequency accuracy of 0.1% and a quality factor of 24. Compared to the equivalent switched capacitor (SC) implementation of these filters, the single-ended SI filter requires 30% less area for the same minimum-sized capacitance, power dissipation and performance.< >
ISSN:0018-9200
1558-173X
DOI:10.1109/4.328641