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The floating capacitor as a differential building block

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4 Author(s)
Gasulla-Fomer, M. ; Dept. d''Enginyeria Electron., Univ. Politecnica de Catalunya, Barcelona, Spain ; Jordana-Barnils, J. ; Pallas-Areny, R. ; Torrents, J.M.

This paper analyzes the advantages and limitations of using the floating(or flying-) capacitor technique as a building block with differential input and either differential or single-ended output to implement voltage amplifiers, multiplexers, and coherent amplitude demodulators. Theoretical analysts, supported by experimental results, shows that the fully differential configuration has a better common-mode rejection ratio (CMRR). However, if the output signal, once amplified, must be single ended, then it may be better to have a floating capacitor with single-ended output in amplifiers and some multiplexers whereas in demodulators a floating capacitor with differential output yields a better CMRR

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:47 ,  Issue: 1 )

Date of Publication:

Feb 1998

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