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US 2015/0146832 A1Published application
Main Clock High Precision Oscillator
AssigneeMicrochip Technology Incorporated
InventorsPhilippe Deval, Gabriele Bellini, Patrick Besseux, Francesco Mazzilli
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Abstract
A clock oscillator includes a high speed oscillator generating a high speed clock signal and comprising a digital trimming function; a counter receiving said high speed clock signal at a clock input; a time base having a low drift and controlling said counter, wherein the counter generates a difference between a reference value and a counter value; and a digital integrator receiving said difference value and providing trimming data for said high speed oscillator.
Claims34
A clock oscillator comprising:
- a high speed oscillator generating a high speed clock signal and comprising a digital trimming function;
- a counter receiving said high speed clock signal at a clock input;
- a time base having a low drift and controlling said counter, wherein the counter generates a difference between a reference value and a counter value;
- and
- a digital integrator receiving said difference value and providing trimming data for said high speed oscillator.
2 more elements
An integrated circuit, comprising:
- a time base circuit generating a time reference;
- a counter receiving the time reference and configured to generate an error signal based on the difference between the count number of HF clock pulses occurring along the time reference duration and a calibration number;
- a digital integrator configured to generate a trimming function based on the error signal;
- and
- a high speed oscillator controllable using the trimming function and configured to provide HF clock pulses to the counter.
2 more elements
A method, comprising:
- generating a time reference based on a time base;
- HF oscillator providing HF clock counting HF clock pulses during duration of the time reference;
- generating an error signal based on the HF clock pulses count of the duration of the time reference and a calibration signal;
- generating a trimming code based on the error signal;
- and
- controlling a high speed oscillator using the trimming signal.
3 more elements
Dependencies are inferred from the claim text.