A CMOS, self-biased charge amplifier

A CMOS, self-biased charge amplifier

In this article a charge amplifier dedicated to the signal processing of a capacitive silicon microphone is described. One feature of this amplifier is the implementation of a self-biased technique. It is a transconductance amplifier having a very high output resistance. The current consumption is q...

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Bibliographische Detailangaben
Hauptverfasser: Amendola, G., Blanchard, Y., Exertier, A., Spirkovitch, S., Lu, G., Alquie, G.
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Capacitive sensors
Capacitors
Circuit simulation
Circuit testing
CMOS technology
Microphones
Operational amplifiers
Parasitic capacitance
Transconductance
Voltage
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Beschreibung
Zusammenfassung:In this article a charge amplifier dedicated to the signal processing of a capacitive silicon microphone is described. One feature of this amplifier is the implementation of a self-biased technique. It is a transconductance amplifier having a very high output resistance. The current consumption is quite low (20 /spl mu/A without the bias circuit) and the dimensions are 210 /spl mu/m by 170 /spl mu/m (including all capacitors). The amplifier has been designed and fabricated in 0.8 /spl mu/m CMOS technology. Both simulation and measurement results have shown the analog memorization of DC bias voltage.
DOI:10.1109/MMICA.1999.833580