Frequency modulated microphone system

A microphone system comprising:

• a MEMS microphone including
• a movable electrode having a first side and a second side opposite the first side, the movable electrode configured such that acoustic pressures acting on the first side and the second side of the movable electrode cause movement of the movable electrode, and
• a stationary electrode positioned on the first side of the movable electrode;
• a phase-locked loop including
• a voltage-controlled oscillator coupled to the MEMS microphone that receives a control signal, and
• generates an oscillating signal based on the control signal and a capacitance between the movable electrode and the stationary electrode, and
• a phase detector coupled to the voltage-controlled oscillator that receives the oscillating signal and a reference signal,
• detects a phase difference between the oscillating signal and the reference signal, and
• generates the control signal based on the phase difference;
• and
• a controller coupled to the phase-locked loop, the controller configured to receive the control signal, and determine an audio signal based on the control signal.