Microphone preamplifier

Details Microphone preamplifier Microphone preamplifier

2006-07-04

2006-07-04

Mei, Xu (Department: 2644)

Electrical audio signal processing systems and devices

With amplifier

C381S111000, C381S095000, C381S113000, C381S114000

Reexamination Certificate

active

07072478

ABSTRACT:
A microphone preamplifier. An electrical signal from a microphone is received via a shielded cable by an input stage cascaded with an output stage. The input stage contains an impedance converter and a phase inverter and receives feedback that reduces input capacitance, actively shields the coaxial cable, and stabilizes the input stage. The output stage contains a buffer and output driver and provides amplified versions of the input stage output. The preamplifier contains means for transformerless phantom powering the microphone and the microphone preamplifier, for sharing current between the input and the output stages, and for limiting the frequency at the output of the microphone.

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Ross “T.H.E. Mics,”RECORDINGOct. 2001, vol. 15, No. 1.
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