Operational dc constraints for a class-A, third-order, observer canonical-form log-domain filter

• Published in: IEEE transactions on circuits and systems. 1, Fundamental theory and applications Vol. 50; no. 10; pp. 1337 - 1342
• Main Authors: Drakakis, E.M., Burdett, A.J.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-10-2003; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Bipolar transistor circuits; Capacitors; DC generators; Filtering; Filters; Frequency; Nonlinear circuits; Poles and zeros; Signal processing; Voltage
• ISSN: 1057-7122; 1558-1268
• DOI: 10.1109/TCSI.2003.816328

This brief reveals certain nonevident though necessary dc constraints for the correct operation of a class-A log-domain third-order observer canonical-form frequency-shaping network. The impact of current-source mismatch upon these constraints is also examined. The brief sheds light on the issue of correct dc-biasing of class-A log-domain circuits.