Preamplifier for two terminal electret condenser microphones

Details Preamplifier for two terminal electret condenser microphones Preamplifier for two terminal electret condenser microphones

2005-05-03

2005-05-03

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including field effect transistor

C330S310000, C330S311000, C381S120000

Reexamination Certificate

active

06888408

ABSTRACT:
The present invention relates to a preamplifier suitable for use with Electret Condenser Microphones such as used within telecommunication equipment. More particularly the invention relates to a preamplifier specially suited for the demands to such a preamplifier within telecommunication equipment: low input capacitance, gain and a combined terminal for output and supply voltage, thus making the preamplifier suitable for two terminal microphone assemblies. These features are obtained with a two stage amplifier with a first stage optimised for low input capacitance and the second stage being able to provide gain. The preamplifier may be implemented using an ASIC, thus making the preamplifier suitable for applications with very limited space available, such as for integration within microphone assemblies.

REFERENCES:
patent: 3825849 (1974-07-01), Linder
patent: 4163197 (1979-07-01), Sampei
patent: 4301416 (1981-11-01), Perahia
patent: 5589799 (1996-12-01), Madaffari et al.
patent: 6160450 (2000-12-01), Eschauzier et al.
patent: 6211738 (2001-04-01), Hecht
patent: 0969695 (2000-01-01), None

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