A Low-Power Switched-Capacitor Capacitive Transducer With High Resolution

Author

Zhang, Xiaoling ; Chan, P.K.

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore

Volume

57

Issue

7

fYear

2008

fDate

7/1/2008 12:00:00 AM

Firstpage

1492

Lastpage

1499

Abstract

A new capacitive transducer using a pseudodifferential-input-single-ended output topology for low- power portable applications is presented. This is based on a switched-capacitor chopper-stabilized pseudodifferential integrator structure that is cascaded with a chopper-stabilized differential difference amplifier, consisting of a single output and a bandpass AC output. The measured results have shown that the transducer integrated circuit, with a sampling rate of 64 kHz in a 0.6-mum CMOS technology, dissipates 820 muA at a 3.3-V supply and exhibits a low noise characteristic. For a 100-Hz bandwidth, the input-referred minimum detectable capacitances are 57.24 and 33.82 aF with reference to the single output and the bandpass output, respectively.

Keywords

CMOS integrated circuits; capacitive sensors; switched capacitor networks; CMOS technology; capacitive transducer; differential difference amplifier; lowpower switched-capacitor; pseudodifferential-input-single-ended output topology; size 0.6 micron; transducer integrated circuit; voltage 3.3 V; Accelerometer; capacitive measuring circuit; capacitive transducer; chopper stabilization (CHS); differential difference amplifier (DDA); integrated sensor; switched-capacitor circuit;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2008.917680

Filename

4464117