CALIBRATION OF OSCILLATOR DEVICES
First Claim
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1. A method to configure a device to generate an output signal having a particular frequency, the method comprising:
- receiving a calibration clock signal over an input/output terminal of the device;
generating at least one control value in a calibration control loop of the device that includes a phase detector and a digitally controlled oscillator (DCO), to cause an output signal of the DCO to lock to a multiple of the calibration clock signal, thereby causing the device to generate the output signal having the particular frequency; and
storing a value corresponding to the at least one control value in a non-volatile memory in the integrated circuit.
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Abstract
A clock device having a resonating device such as a crystal of SAW supplying a controllable oscillator such as a digitally controlled oscillator is calibrated by supplying a calibration clock. A phase-locked loop is utilized to generate one or more correction factors causing the PLL to lock to the calibration clock. The one or more correction factors are then stored in non-volatile memory.
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Citations
18 Claims
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1. A method to configure a device to generate an output signal having a particular frequency, the method comprising:
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receiving a calibration clock signal over an input/output terminal of the device;
generating at least one control value in a calibration control loop of the device that includes a phase detector and a digitally controlled oscillator (DCO), to cause an output signal of the DCO to lock to a multiple of the calibration clock signal, thereby causing the device to generate the output signal having the particular frequency; and
storing a value corresponding to the at least one control value in a non-volatile memory in the integrated circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus comprising:
an integrated circuit including, a controllable oscillator coupled to receive a reference frequency signal and a control value and to output a clock signal;
a terminal to receive a calibration clock signal;
a phase-locked loop circuit including the controllable oscillator, coupled to the terminal, the phase-locked loop circuit responsive to the calibration clock signal and a feedback signal from the controllable oscillator to generate a control signal to cause the controllable oscillator to lock to a multiple of the calibration clock signal; and
a non-volatile memory for storing a value corresponding to the control signal. - View Dependent Claims (12, 13, 14, 15)
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16. An apparatus comprising:
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a terminal for receiving a calibration clock signal;
a controllable oscillator coupled to receive a reference signal and generate a clock signal;
means for calibrating the apparatus utilizing the calibration clock signal by internally generating, in a phase-locked loop, one or more control values for the controllable oscillator to cause the oscillator to output a signal corresponding to the calibration clock; and
a non-volatile storage for storing one or more values corresponding to the one or more control values.
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17. The apparatus as recited in claim 17 wherein the apparatus comprises an integrated circuit and a resonating device in a sealed package.
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18. The apparatus as recited in claim 42 wherein the controllable oscillator is a voltage-controlled oscillator.
Specification