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Transducer Physics

  • The heart of the MEMS microphone is the variable capacitor formed by a fixed backplate and a flexible membrane.

  • Sound pressure deflects the membrane, causing a change in capacitance. This change in capacitance causes a change in voltage according to:

C=Q/V C = Capacitance [Farads] Q = Charge [Coulumbs] V = Voltage [Volts]

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