US 11,668,924 B2
Control structure for oscillators with nonlinear frequency response
David Brunner, Dobersberg (AT); Franz Michael Darrer, Graz (AT); and Georg Schitter, Vienna (AT)
Assigned to Infineon Technologies AG, Neubiberg (DE)
Filed by Infineon Technologies AG, Neubiberg (DE)
Filed on Jan. 22, 2020, as Appl. No. 16/749,270.
Prior Publication US 2021/0223536 A1, Jul. 22, 2021
Int. Cl. G02B 26/08 (2006.01); G01S 17/26 (2020.01); H03L 7/085 (2006.01); H03L 7/099 (2006.01); G01S 7/481 (2006.01); G02B 26/10 (2006.01); H03L 7/06 (2006.01); H03B 5/30 (2006.01)
CPC G02B 26/0833 (2013.01) [G01S 7/4817 (2013.01); G01S 17/26 (2020.01); G02B 26/0841 (2013.01); G02B 26/105 (2013.01); H03B 5/30 (2013.01); H03L 7/06 (2013.01); H03L 7/085 (2013.01); H03L 7/0991 (2013.01)] 26 Claims
OG exemplary drawing
 
1. An oscillator control system, comprising:
an oscillator structure configured to oscillate about an axis, wherein an angle amplitude and a frequency of the oscillator structure have a non-linear dependency;
a driver circuit configured to generate a driving signal to drive an oscillation of the oscillator structure;
a detection circuit configured to measure the angle amplitude and a phase error of the oscillator structure;
an outer control loop comprising an amplitude controller configured to generate a reference oscillator period based on the measured angle amplitude; and
an inner control loop comprising a period and phase controller configured to receive the reference oscillator period from the outer control loop and the measured phase error from the detection circuit, generate at least one control parameter of the driving signal based on the reference oscillator period and the measured phase error, and determine a driving period of the driving signal based on the reference oscillator period and the measured phase error,
wherein the driver circuit is configured to generate the driving signal based on the at least one control parameter of the driving signal and the driving period,
wherein the period and phase controller is configured to estimate an oscillator period of the oscillator structure, determine an oscillator period error based on the estimated oscillator period and the reference oscillator period, and adapt the driving period and the at least one control parameter of the driving signal to compensate for both the measured phase error and the determined oscillator period error, and
wherein the determined oscillator period error is a difference between the estimated oscillator period and the reference oscillator period.