Microphone PCB with integrated filter

Details Microphone PCB with integrated filter Microphone PCB with integrated filter

2006-10-31

2006-10-31

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

With electrostatic microphone

C381S111000, C381S114000, C381S112000, C381S094100, C361S794000, C361S793000, C029S594000

Reexamination Certificate

active

07130434

ABSTRACT:
The present invention provides a solution to the needs described above through a microphone PCB with an integrated filter. The invention provides for an electret microphone assembly. The microphone assembly includes a multilayer printed circuit board. A field effect transistor with a gate is coupled to the electret microphone. The field effect transistor drain is coupled to provide audio frequency output to an audio output node, and the field effect transistor source is coupled to a ground. A first end of a resistor is coupled to the drain of the field effect transistor and the second end is coupled to a filter. The filter attenuates unwanted electromagnetic interference associated with a radio frequency transmitter. The filter includes a filter capacitor made of a ground layer coupled to ground within the multilayer printed circuit board, an active layer within the multilayer printed circuit board coupled to the second end of the resistor, and a dielectric layer disposed between the ground layer and the active layer. The filter further includes a first and second inductor comprising vias coupled to the active layer within the printed circuit board.

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“Decoupling Capacitor Calculation for a DDR Memory Channel”, DesignLine, Micron Technology, Inc., vol. 9, Issue 3, 2000.

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