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US 2019/0379382 A1Published application
Compensating for frequency variation of a crystal oscillator and related systems, methods and devices
AssigneeMicrochip Technology Incorporated
InventorArnel Tagatac
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Abstract
Systems, methods, and devices of the present disclosure relate, generally, to compensating for frequency error of a reference signal supplied to a clock-tracking-loop due to temperature. Error characteristics of a crystal oscillator that supplies the reference signal are used to compensate for possible frequency errors. Other systems, methods and devices are disclosed.
Claims25
A method of configuring a clock-tracking-loop (CTL) for operation across a wide temperature range, the method comprising:
- receiving one or more temperature measurements associated with a crystal oscillator providing a reference signal to a clock-tracking-loop (CTL);
- and
- configuring the CTL to adjust an output signal of the CTL responsive to the one or more temperature measurements and one or more frequency error characteristics associated with the crystal oscillator.
A control system for a clock-tracking-loop, the system comprising:
- a temperature sensor configured to provide one or more temperature measurements associated with a crystal oscillator;
- an error compensation circuitry configured to determine one or more frequency error characteristics of the crystal oscillator responsive to the one or more temperature measurements;
- and
- a control circuitry configured to program a clock-tracking-loop (CTL) to adjust an output signal of the CTL responsive to the one or more frequency error characteristics associated with the crystal oscillator.
1 more element
A clock-tracking-loop system, comprising:
- a clock-tracking-loop (CTL) configured to provide an output signal that tracks to a reference signal provided by a crystal oscillator responsive to one or more device settings;
- and
- a control circuitry configured to provide one or more device settings to the CTL, the control circuitry comprising:
- a temperature sensor configured to provide one or more temperature measurements associated with a crystal oscillator;
- an error compensation circuitry configured to determine one or more frequency error characteristics of the crystal oscillator responsive to the one or more temperature measurements;
- and
- a control circuitry configured to program a clock-tracking-loop (CTL) to adjust an output signal of the CTL responsive to the one or more frequency error characteristics associated with the crystal oscillator, and
- wherein the CTL is configured to provide the output signal that tracks to the reference signal by:
- adjusting a frequency of a feedback signal of the CTL responsive to the at least one device parameter, wherein the feedback signal corresponds to a first frequency of the output signal of the CTL;
- generating a phase error signal responsive to the adjusted feedback signal and the reference signal supplied by the crystal oscillator;
- and
- providing the adjusted output signal responsive to the phase error signal, wherein the adjusted output signal has a second frequency.
9 more elements
Dependencies are inferred from the claim text.