A fully integrated Gm-C oscillator for readout of a force balanced accelerometer

Author

Rahikkala, P. ; Aaltonen, L. ; Halonen, K.

Author_Institution

Electron. Circuit Design Lab., Helsinki Univ. of Technol.

fYear

2006

fDate

2-4 Oct. 2006

Firstpage

1

Lastpage

4

Abstract

A tunable 2 MHz to 4 MHz CMOS sinusoidal oscillator for readout of a force balanced capacitive accelerometer is presented. Amplitude stability of the carrier is considered along with frequency stability in a temperature range from -40 degC to +85 degC. Frequency and amplitude are tuned with binary weighted capacitor arrays. Amplitude related frequency drift is compensated using PTAT (proportional to absolute temperature) current reference. A buffer amplifier operating in an open loop configuration compensates the temperature related amplitude drift. Simulated 6 % amplitude stability and 10 % frequency stability within the temperature range is achieved. Simulation results are presented in this paper

Keywords

CMOS integrated circuits; HF amplifiers; accelerometers; buffer circuits; capacitive sensors; frequency stability; oscillators; readout electronics; -40 to 85 C; 2 to 4 MHz; CMOS sinusoidal oscillator; Gm-C oscillator; amplitude stability; binary weighted capacitor arrays; buffer amplifier; force balanced capacitive accelerometer; frequency stability; proportional to absolute temperature current reference; Accelerometers; Capacitance; Circuits; Electrodes; Frequency; Micromechanical devices; Stability; Temperature; Transconductance; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Baltic Electronics Conference, 2006 International

Conference_Location

Tallinn

ISSN

1736-3705

Print_ISBN

1-4244-0414-2

Electronic_ISBN

1736-3705

Type

conf

DOI

10.1109/BEC.2006.311077

Filename

4100298