Infineon Technologies Ag

Andres Quintero Alonso

Luis Hernandez-Corporales

Pedro Augusto Borrego Lambin Torres Amaral

Ruben Garvi Jimenez-Ortiz

Victor Medina

Javier Granizo Cuadrado

A circuit includes: a micro-electromechanical system (MEMS) microphone configured to generate a voltage signal at an output terminal of the MEMS microphone in response to a sound signal; a voltage-controlled-oscillator (VCO) coupled to the output terminal of the MEMS microphone and configured to output, at an output terminal of the VCO, a frequency modulated signal having a frequency proportional to the voltage signal; a frequency-to-digital (FTD) converter coupled to the output terminal of the VCO and configured to convert the frequency modulated signal into a digital output signal proportional to the frequency; a frequency-to-voltage (FTV) conversion circuit coupled to the output terminal of the VCO and configured to generate a bias voltage at an output terminal of the FTV conversion circuit in accordance with the frequency modulated signal; and a resistor coupled between the output terminal of the MEMS microphone and the output terminal of the FTV conversion circuit.

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Villach, Austria

Andres Quintero Alonso