Microphone assembly with P-type preamplifier input stage
US8229138B2 · kind B2 · utility
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5References
20Claims
0Family size
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Key dates
| Filing date | Jul 6, 2006 |
| Grant date | Jul 24, 2012 |
| Priority date | — |
| Expiry date | Apr 18, 2030 |
Classification
- Technology area (CPC —)General
Abstract
A microphone assembly is provided that includes a condenser transducer element having a displaceable diaphragm and a back-plate. The displaceable diaphragm and the back-plate are arranged to form a capacitor in combination. A preamplifier circuit has an input stage, the input stage comprising a P-type field effect transistor. The displaceable diaphragm and the back-plate are operatively connected between a source input and a gate input of the P-type field effect transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.