Low-voltage high-speed current-mode continuous-time IC filters with orthogonal /spl omega//sub 0/-Q tuning

The design of fully differential high-frequency continuous-time current-mode filters is presented. A universal biquad is constructed from two basic building blocks, lossless and lossy differential current-mode integrators, Pole frequency /spl omega//sub 0/ and quality factor Q are tuned orthogonally...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. 2, Analog and digital signal processing Analog and digital signal processing, 1999-04, Vol.46 (4), p.390-400
Main Authors: Shana'a, O., Schaumann, R.
Format: Article
Language:English
Subjects:
Circuit optimization
Current mode circuits
Frequency
High speed integrated circuits
Low pass filters
Q factor
Switches
Transfer functions
Tuning
Voltage
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Summary:The design of fully differential high-frequency continuous-time current-mode filters is presented. A universal biquad is constructed from two basic building blocks, lossless and lossy differential current-mode integrators, Pole frequency /spl omega//sub 0/ and quality factor Q are tuned orthogonally by means of a translinear circuit. The design is illustrated on a 200-MHz fifth-order cascade low-pass filter. The tuning scheme is used to switch the transfer function electronically from a Butterworth to a Bessel characteristic. The proposed circuits use a single-ended supply that can be as low as 1.5 V with no special technology required. The design was implemented in an 8-GHz bipolar process.
ISSN:1057-7130
1558-125X
DOI:10.1109/82.755410