4. Imperfections due to active elements

The performance of a switched-capacitor filter depends critically on the quality of its components. Capacitors must be in precise, stable ratios, with only low-value parasitic capacitances. Amplifiers need to transfer charge as quickly as possible, which implies a short settling time and a very fast rise time. They must have a low offset voltage. Switches must have very low forward resistances and low parasitic capacitances. Finally, and most importantly, amplifiers must generate low noise and be able to reject external noise, especially from the power supply.

A detailed study of these various imperfections and the means used by manufacturers to remedy them is beyond the scope of this article. The interested reader may wish to consult the excellent review article by J. Allstot and W. Black [10] ....

You do not have access to this resource.

Exclusive to subscribers. 97% yet to be discovered!

You do not have access to this resource.
Click here to request your free trial access!

Already subscribed? Log in!

The Ultimate Scientific and Technical Reference

A Comprehensive Knowledge Base, with over 1,200 authors and 100 scientific advisors

+ More than 10,000 articles and 1,000 how-to sheets, over 800 new or updated articles every year

From design to prototyping, right through to industrialization, the reference for securing the development of your industrial projects

This article is included in

Electronics

This offer includes:

Knowledge Base

Updated and enriched with articles validated by our scientific committees

Services

A set of exclusive tools to complement the resources

Practical Path

Operational and didactic, to guarantee the acquisition of transversal skills

Doc & Quiz

Interactive articles with quizzes, for constructive reading

Subscribe now!

Ongoing reading
Imperfections due to active elements

Previous
page Summary

Implementation

Bibliography

Basic works

ALLEN (P.E.), SANCHEZ-SINENCIO (E.) - Switched capacitor circuits - . 760 p., New York, Van Nostrand (1984).
HASLER (M.), NEIRYNCK (J.) - Filtres électriques - . Paris, 352 p., Dunod.
...

Analysis software

A number of analysis software packages are available, based on the principles of nodal analysis, to which refinements have been added to reduce calculation times and introduce the imperfections of active elements. Comparative analyses are available at

Examples of catalogued tours

Several manufacturers offer switched-capacitor biquadratic cells in the form of cataloged circuits. The best-known are the MF10 and LMF100 (National Semiconductor), containing two second-order biquadratic cells in a 20-pin package (DIP package) ...