A low-power capacitance measurement circuit with high resolution and high degree of linearity

Author

Haider, M.R. ; Mahfouz, M.R. ; Islam, S.K. ; Eliza, S.A. ; Qu, W. ; Pritchard, E.

Author_Institution

Tennessee Univ., Knoxville, TN

fYear

2008

fDate

10-13 Aug. 2008

Firstpage

261

Lastpage

264

Abstract

This paper has presented a low-power capacitance read-out circuit which could be used for biomedical sensor applications. The differential structure of the system eliminates even order distortion. The entire system manifests two current sense amplifiers, two diode rectifiers and one instrumentation amplifier. The circuit has been realized using TSMC 0.35 mum bulk CMOS process. The circuit operates with a 3 V power supply and consumes 5.384 mW of power. Simulation results show that the circuit has a sensitivity of 1.32 mV for 1 fF capacitance change. Measurement results for different capacitance variations demonstrate a change of 10.8 mV for 8.8 fF variation.

Keywords

CMOS analogue integrated circuits; capacitance measurement; capacitive sensors; low-power electronics; readout electronics; TSMC bulk CMOS process; biomedical sensor applications; current sense amplifiers; diode rectifiers; instrumentation amplifier; low-power capacitance measurement circuit; power 5.384 mW; read-out circuit; size 0.35 mum; voltage 3 V; Biomedical measurements; Biosensors; CMOS process; Capacitance measurement; Circuit simulation; Diodes; Instruments; Linearity; Power supplies; Rectifiers; capacitance measurement; low-power; read-out circuit;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2008. MWSCAS 2008. 51st Midwest Symposium on

Conference_Location

Knoxville, TN

ISSN

1548-3746

Print_ISBN

978-1-4244-2166-4

Electronic_ISBN

1548-3746

Type

conf

DOI

10.1109/MWSCAS.2008.4616786

Filename

4616786