Integrated continuous-time balanced filters for 16-b DSP interfaces

A fully integrated, low-distortion, balanced, continuous-time filter fabricated in 5-V, 1.6- mu m CMOS is presented. Active RC structures are used in a leapfrog topology, with time constants set by integrated passive resistors and capacitors. Accurate tuning is achieved by selection of capacitor ele...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 1993-07, Vol.28 (7), p.835-839
Main Authors: Durham, A.M., Redman-White, W.
Format: Article
Language:English
Subjects:
Applied sciences
Capacitors
Circuit optimization
Circuit properties
Digital signal processing
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Filters
Frequency
Frequency filters
Linearity
Resistors
Switches
Switching circuits
Tuning
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Summary:A fully integrated, low-distortion, balanced, continuous-time filter fabricated in 5-V, 1.6- mu m CMOS is presented. Active RC structures are used in a leapfrog topology, with time constants set by integrated passive resistors and capacitors. Accurate tuning is achieved by selection of capacitor elements under the control of a new calibrator circuit. With a 2-V/sub rms/ differential input and output, the filter achieves -94-dB THD (total harmonic distortion) and 95-dB signal-to-noise ratio. Tuning accuracy is maintained to within +or-5% of nominal over the commercial temperature range.< >
ISSN:0018-9200
1558-173X
DOI:10.1109/4.222184