Patent ID: 9048785
Filing Date: 2015-06-02
Classification: G01J,H03D

Abstract:
1. A periodically resetting integration angle demodulation device comprising: a waveform multiplier receiving an angle modulation signal derived, from a sensed signal angle variation applied to a carrier, multiplying said angle modulation signal by a square wave signal to obtain a first output signal, the square wave signal having a frequency related in value to a carrier frequency of the angle modulation signal by a predetermined integer multiplication factor; a continuous-time filter coupled to said waveform multiplier, said continuous-time filter receiving said first output signal and filtering out a high-frequency component of said first output signal to generate a second output signal; and a periodically resetting integrator (PRI) coupled to said continuous-time filter, said periodically resetting integrator receiving said second output signal and integrating said second output signal over a plurality of integration periods sequentially disposed in time to obtain a plurality of angle demodulation signal segments, said periodically resetting integrator resetting an angle demodulation signal segment output to zero after each integration period to eliminate multiple frequency terms associated with the carrier; wherein the angle demodulation signal segments collectively indicate the sensed signal angle variation.