Title :
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.
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;
Conference_Titel :
Baltic Electronics Conference, 2006 International
Conference_Location :
Tallinn
Print_ISBN :
1-4244-0414-2
Electronic_ISBN :
1736-3705
DOI :
10.1109/BEC.2006.311077
