Delay measurement, monitoring and compensation of an oscillator control system

Abstract

An oscillator control system that has the following features: an oscillator structure configured to oscillate a rotation axis (13); a phase error detector (32) configured to generate a phase error signal (p(n)) based on a delayed event time signal and a delayed reference signal, wherein the delayed event time signal indicates measured event times of the oscillator structure oscillating about the rotation axis (13) and the delayed reference signal indicates expected event times of the oscillator structure oscillating about the rotation axis (13); an analog signal path (S A ), which is coupled between the oscillator structure and the phase error detector (32), wherein the analog signal path (S A) is configured to receive an event time signal indicating the measured event times and induces an analog delay on the event time signal, thereby generating the delayed event time signal; a control circuit configured to generate a reference signal indicating the expected event times and to generate a driving signal based on the phase error signal (p(n)) to drive an oscillation of the oscillator structure; a programmable delay circuit (44) configured with a programmable delay, wherein the programmable delay circuit (44) is configured to receive the reference signal and induce the programmable delay on the reference signal, thereby generating the delayed reference signal; and an analog delay measurement circuit (45) configured to introduce a test signal into the analog signal path (S A) to introduce a delayed test signal from the analog signal path (S A ) to receive, to measure the analog delay based on the delayed test signal, and a configuration signal (S C ) to generate which is configured to set the programmable delay of the programmable delay circuit (44) according to the measured analog delay, wherein the analog signal path (S A) is a sensing feedback path comprising various analog components and printed circuit board connections, each of which also contributes to a portion of the total analog delay in sensing the position information, wherein an analog delay block (42) is provided in the sensing feedback path and represents the total analog delay that occurs between the MEMS mirror (12) and the phase error detector (32), wherein the analog delay block (42) is configured to delay a timing of the actual zero-crossing signal corresponding to an actual zero crossing detected during an oscillation of the MEMS mirror (12), wherein the delay by the analog delay block (42) results in a delayed zero-crossing signal (DZCmeas) that is received by the phase error detector (32).

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