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 analysis, 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.
CitationGasulla, M; Jordana, J; Pallás, R; Torrents, JM. The floating capacitor as a differential building block. IEEE Transactions on Instrumentation and Measurement, 1998 vol. 47, núm. 1, p. 26-29
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