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US 2016/0112052 A1Published application
Low Power Automatic Calibration Method for High Frequency Oscillators
AssigneeAmbiq Micro, Inc.
InventorStephen James Sheafor
Life of this patent
Estimating the term…
Abstract
A clock calibrator for use in an electronic system comprising an integrated circuit such as a microcontroller. The clock calibrator embodies a frequency adjustment facility adapted dynamically to adjust the frequency of one or more high-frequency clock generators as a function of a lower-frequency reference clock.
Claims12
A clock calibration method comprising the steps of:
- [1] in response to a first control signal:
- [1.1] in response to a second control signal, selectively enabling a reference clock oscillator to develop reference clock pulses at a selected reference frequency;
- and
- [1.2] in response to a third control signal, selectively enabling a measured clock oscillator to develop measured clock pulses at a frequency determined as a function of an adjustment value;
- [2] in response to a first one of the reference clock pulses, initiating counting of the measured clock pulses;
- [3] in response to a second reference clock pulse, terminating counting of the measured clock pulses;
- and
- [4] adjusting the adjustment value as a function of a difference between the count of the measured clock pulses and a selected target value.
5 more elements
A clock calibration method comprising the steps of:
- [1] in response to a first control signal:
- [1.1] in response to a second control signal, selectively enabling a reference clock oscillator to develop reference clock pulses at a selected reference frequency;
- and
- [1.2] in response to a third control signal, selectively enabling a measured clock oscillator to develop measured clock pulses at a frequency determined as a function of an adjustment value;
- and
- [2] in response to a selected one of the reference clock pulses, adjusting the adjustment value as a function of a difference between the frequency of the measured clock relative to the frequency of the reference clock.
3 more elements
A clock calibration method comprising the steps of:
- [1] in response to a first control signal, selectively enabling a reference clock oscillator to develop reference clock pulses at a selected reference frequency;
- [2] in response to a second control signal, selectively enabling a measured clock oscillator to develop measured clock pulses at a frequency determined as a function of an adjustment value;
- [3] in response to a first one of the reference clock pulses, initiating counting of the measured clock pulses;
- [4] in response to a second reference clock pulse, terminating counting of the measured clock pulses;
- [5] adjusting the adjustment value as a function of a difference between the count of the measured clock pulses and a selected target value;
- [6] selectively repeating steps [3] through [5];
- [7] in response to the first control signal, selectively disabling the reference clock oscillator;
- and
- [8] in response to the second control signal, selectively disabling the measured clock oscillator.
6 more elements
A clock calibration method comprising the steps of:
- [1] in response to a first control signal, selectively enabling a reference clock oscillator to develop reference clock pulses at a selected reference frequency;
- [2] in response to a second control signal, selectively enabling a measured clock oscillator to develop measured clock pulses at a frequency determined as a function of an adjustment value;
- and
- [3] in response to a selected one of the reference clock pulses, adjusting the adjustment value as a function of a difference between the frequency of the measured clock relative to the frequency of the reference clock.
1 more element
A clock calibration facility configured to perform the method of any preceding claim.
Dependencies are inferred from the claim text.