Systems and methods for sensing angular motion in the presence of low-frequency noise

A system for sensing angular motion, comprising:

• circuitry configured to:
• receive, from a resonator path output terminal of a microelectromechanical system (MEMS) gyroscope, a resonator signal generated in response to resonance of the MEMS gyroscope;
• receive, from a sense path output terminal of the MEMS gyroscope, a first sense signal generated in response to a Coriolis force;
• generate a control signal at least in part based on:
• a first signal generated based a rising edge of the resonator signal and a rising edge of a reference signal,
• a second signal generated based on a falling edge of the resonator signal and a falling edge of the reference signal, and
• an enabling signal;
• control a frequency of a demodulating signal using the control signal;
• and
• generate a second sense signal using the first sense signal and the demodulating signal.

A system for sensing angular motion, the system comprising:

• a microelectromechanical system (MEMS) gyroscope having a sense path output terminal and a resonator path output terminal;
• a mixer having first and second input terminals, the first input terminal being coupled to the sense path output terminal of the MEMS gyroscope;
• a phase-locked loop (PLL) coupled to the resonator path output terminal of the MEMS gyroscope and to the second terminal of the mixer, the PLL comprising:
• a dual-edge phase frequency detector (DE-PFD);
• a charge pump coupled to the DE-PFD;
• a voltage controlled oscillator (VCO);
• and
• a switch coupled between the charge pump and the VCO.