Amplifier circuit for capacitive transducers

Details Amplifier circuit for capacitive transducers Amplifier circuit for capacitive transducers

2005-01-11

2009-12-15

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

With electrostatic microphone

C381S120000, C381S174000, C330S259000, C330S290000

Reexamination Certificate

active

07634096

ABSTRACT:
An amplifier circuit for capacitive transducers, such as miniature electret or condenser microphones, wherein the amplifier circuit comprises bias control means adapted to improve settling of the amplifier circuit. Another aspect of the invention relates to a miniature condenser microphone and a monolithic integrated circuit comprising an amplifier circuit according to the present invention. The present invention provides amplifier circuits of improved performance by resolving traditionally conflicting requirements of maintaining a large input resistance of the amplifier circuit to optimize its noise performance and provide fast settling of the amplifier circuit.

REFERENCES:
patent: 4063050 (1977-12-01), Carlson et al.
patent: 4894862 (1990-01-01), Defretin et al.
patent: 5097224 (1992-03-01), Madaffari et al.
patent: 5132634 (1992-07-01), Suarez
patent: 5861779 (1999-01-01), Loeppert et al.
patent: 6160450 (2000-12-01), Eschauzier et al.
patent: 6275109 (2001-08-01), Tang
patent: 6353344 (2002-03-01), Lafort
patent: 6366678 (2002-04-01), Madaffari et al.
patent: 2002/0125949 (2002-09-01), Stenberg
patent: 2003/0199130 (2003-10-01), Lafort
patent: 1 355 417 (2003-10-01), None
“A Low-Power Low-Noise CMOS Amplifier for Neural Recording Applications,” IEEE Journal of Solid-State Circuits, vol. 38, No. 6, pp. 958-965 (Jun. 2003).
European Search Report for European Application No. EP 05 07 5002, dated Apr. 12, 2005 (3 pages).
“A Mosfet Amplifier Autotracking Biasing Circuit” 8182 Motorola Technical Developments 12 Apr. 1991, Schaumburg, Illinois, US (1 page).
“A High-Speed Depletion-Mode DMOS FET For Small-Signal Applications” 2420 Elektor Electronics 14 Sep. 1988, No. 159, London, Gr. Britain (3 pages).

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