Integrated silicon capacitive accelerometer with PLL servo technique

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

An integrated silicon capacitive accelerometer has been developed with CMOS and micromachining technology. The accelerometer chip has glass-silicon-glass structure and is 3.7 × 4.5 × 0.9 mm3 in size. A silicon seismic mass is suspended with silicon-oxinitride beams in full symmetry. The sensor capacitance is formed between the silicon mass and a metal electrode on the upper glass. A CMOS capacitance to frequency (C-F) converter is integrated on the silicon chip. The circuit is designed to be stable to temperature and supply voltage. The circuit has a reference capacitor in it, and the drift of the circuit is compensated by the information obtained when the circuit is connected to the reference capacitor. The output frequency of the accelerometer chip varies linearly with acceleration. The force-balancing system has been realized using the accelerometer chip and an outer phase-locked-loop (PLL) servo circuit. The output voltage varies linearly with acceleration, and the sensitivity and offset of the output voltage can be adjusted with the outer circuit parameter.

Original languageEnglish
Pages (from-to)209-217
Number of pages9
JournalSensors and Actuators: A. Physical
Volume39
Issue number3
DOIs
Publication statusPublished - 1993
Externally publishedYes

Fingerprint

Silicon
accelerometers
Phase locked loops
Accelerometers
Networks (circuits)
silicon
chips
Glass
glass
output
CMOS
capacitors
Electric potential
electric potential
Capacitors
Capacitance
capacitance
Frequency converters
Micromachining
frequency converters

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Instrumentation

Cite this

Integrated silicon capacitive accelerometer with PLL servo technique. / Matsumoto, Yoshinori; Esashi, M.

In: Sensors and Actuators: A. Physical, Vol. 39, No. 3, 1993, p. 209-217.

Research output: Contribution to journalArticle

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