System and method for countering the effects of microphonics in a phase locked loop
A method and apparatus for operating an electronic device is provided. The electronic device, which includes a phase lock loop (PLL) receives sensor indicators from at least one sensor. Upon receiving sensor indicators, the device identifies a motion indicator based on the sensor indicators. A parameter of the PLL is adjusted based on the motion indicator, the PLL having at least one component susceptible to microphonics. When the PLL includes a charge pump, a parameter that may be adjusted is a pump current of the charge pump. When the PLL further comprises an oscillator for generating a reference signal, the parameter that may be adjusted is a trim of the oscillator.
1. A method of operating an electronic device comprising:
receiving sensor indicators from at least one sensor;
identifying a motion indicator based on the sensor indicators; and
adjusting a parameter of a phase lock loop (PLL) based on the motion indicator, the PLL having at least one component susceptible to microphonics.
2. The method of claim 1 wherein the motion indicator is a vibration intensity.
3. The method of claim 2 wherein adjusting the parameter further comprises adjusting the parameter when the vibration intensity is greater than a predefined threshold.
4. The method of claim 1 wherein the PLL includes a charge pump and the parameter is a pump current of the charge pump.
5. The method of claim 4 wherein adjusting further comprises increasing the magnitude of the pump current.
6. The method of claim 5 wherein the magnitude of increase of the pump current is based on the motion indicator.
7. The method of claim 6 wherein the magnitude of increase of the current supplied is obtained from a memory of the device, based on the motion indicator.
8. The method of claim 1 wherein the PLL further comprises an oscillator for generating a reference signal and the parameter is a trim of the oscillator.
9. The method of claim 8 wherein the magnitude of the trim is based on the motion indicator.
10. The method of claim 1 further comprising:
selecting the parameter to be adjusted based on the motion indicator.
11. An electronic device comprising:
at least one sensor;
a phase lock loop (PLL) having at least one component susceptible to microphonics;
a memory; and
a processor connected to the at least one sensor, the memory and the PLL, the processor operating to:
receive sensor indicators from the at least one sensor;
identify a motion indicator based on the sensor indicators; and
adjust a PLL parameter based on the motion indicator.
12. The electronic device of claim 11 wherein the motion indicator is a vibration intensity.
13. The electronic device of claim 12 wherein adjusting the PLL parameter further comprises adjusting the PLL parameter when the vibration intensity is greater than a predefined threshold.
14. The electronic device of claim 11 wherein the PLL includes a charge pump and the PLL parameter is a pump current of the charge pump.
15. The electronic device of claim 14 wherein adjusting further comprises increasing the magnitude of the pump current.
16. The electronic device of claim 15 wherein the magnitude of increase of the pump current is based on the motion indicator.
17. The electronic device of claim 16 wherein the magnitude of increase of the current supplied is obtained from a memory of the device, based on the motion indicator.
18. The electronic device of claim 11 wherein the PLL further comprises an oscillator for generating a reference signal and the PLL parameter is a trim of the oscillator.
19. The electronic device of claim 18 wherein the magnitude of the trim is based on the motion indicator.
20. The electronic device of claim 11 wherein PLL parameter to be adjusted is selected on the basis of the motion indicator.