Digital microphones are commonly based on an LF-condenser wit an ADC in the same ousing. However,this concept as some disadvantages,suc as t e inherent problems of LF-condenser microp ones with respect to t e influence of umidity on sensitivity,distortion and low cut-off frequency. Therefore,anot er approac for digital microphones is proposed,w ereby the capacity of t e microp one capsule controls t e frequency of an LC-type generator.The resulting non-linear distortion is of second order and similiar to those of classical microphones wit vacuum tube preamplifier.A negative capacitance can be added to reduce the distortion.There are several ways to implement demodulation and digitalization;simulations show that a sufficient dynamic range can be achieved by using a special kind of sigma-delta FM discriminator.
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