TY - JOUR
T1 - High-performance condenser microphone with fully integrated CMOS amplifier and DC-DC voltage converter
AU - Pedersen, M.
AU - Olthuis, Wouter
AU - Bergveld, Piet
PY - 1998
Y1 - 1998
N2 - The development of a capacitive microphone with an integrated detection circuit is described. The condenser microphone is made by micromachining of polyimide on silicon. Therefore, the structure can be realized by postprocessing on substrates containing integrated circuits (IC's), independently of the IC process, integrated microphones with excellent performances have been realized on a CMOS substrate containing dc-dc voltage converters and preamplifiers. The measured sensitivity of the integrated condenser microphone was 10 mV/Pa, and the equivalent noise level (ENL) was 27 dB(A) re. 20 ¿Pa for a power supply voltage of 1.9 V, which was measured with no bias voltage applied to the microphone. Furthermore, a back chamber of infinite volume was used in all reported measurements and simulations
AB - The development of a capacitive microphone with an integrated detection circuit is described. The condenser microphone is made by micromachining of polyimide on silicon. Therefore, the structure can be realized by postprocessing on substrates containing integrated circuits (IC's), independently of the IC process, integrated microphones with excellent performances have been realized on a CMOS substrate containing dc-dc voltage converters and preamplifiers. The measured sensitivity of the integrated condenser microphone was 10 mV/Pa, and the equivalent noise level (ENL) was 27 dB(A) re. 20 ¿Pa for a power supply voltage of 1.9 V, which was measured with no bias voltage applied to the microphone. Furthermore, a back chamber of infinite volume was used in all reported measurements and simulations
KW - IR-55666
U2 - 10.1109/84.735346
DO - 10.1109/84.735346
M3 - Article
SN - 1057-7157
VL - 7
SP - 387
EP - 394
JO - Journal of microelectromechanical systems
JF - Journal of microelectromechanical systems
IS - 4
ER -
