The floating capacitor as a differential building block

Author

Gasulla-Fomer, M. ; Jordana-Barnils, Josep ; Pallás-Areny, Ramón ; Torrents, Josep Maria

Author_Institution

Dept. d´´Enginyeria Electron., Univ. Politecnica de Catalunya, Barcelona, Spain

Volume

47

Issue

1

fYear

1998

fDate

2/1/1998 12:00:00 AM

Firstpage

26

Lastpage

29

Abstract

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

Keywords

capacitors; data acquisition; demodulators; differential amplifiers; differential detection; multiplexing equipment; signal processing equipment; capacitor switching; coherent amplitude demodulators; common-mode rejection ratio; data acquisition; demodulators; differential building block; differential input; differential output yields; floating capacitor; sampling; synchronous detection; voltage amplifiers; Capacitance; Data acquisition; Demodulation; Differential amplifiers; Instruments; Multiplexing; Operational amplifiers; Switched capacitor circuits; Switches; Voltage;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.728783

Filename

728783