Low-latency start-up for a monolithic clock generator and timing/frequency reference
First Claim
1. A start-up apparatus for a free-running harmonic oscillator, the apparatus comprising:
- a first current source adapted to provide a first current;
a second current source adapted to provide a second current, the second current source having at least one complementary to absolute temperature (CTAT) configuration, proportional to absolute temperature (PTAT) configuration, or proportional to absolute temperature squared (PTAT2) configuration;
a bias current monitor coupled to the first current source and the second current source, the bias current monitor adapted to detect a magnitude of the second current and to provide a control signal when the magnitude of the second current is equal to or greater than a predetermined magnitude; and
a bias controller coupled to the bias current monitor, the bias controller adapted to switch the first current from the oscillator and to switch the second current to the oscillator in response to the control signal.
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Abstract
An apparatus, system and method are provided for low-latency start-up of a free-running harmonic oscillator. The exemplary apparatus embodiment comprises a first and second current sources to generate first and second currents; a bias current monitor adapted to detect a magnitude of the second current and to provide a control signal when the magnitude of the second current is equal to or greater than a predetermined magnitude; and a bias controller adapted to switch the first current from the oscillator and to switch the second current to the oscillator in response to the control signal. a reference voltage generator, a comparator, and a bias controller. Exemplary embodiments include reference voltage generator, a comparator, and a bias controller.
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Citations
35 Claims
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1. A start-up apparatus for a free-running harmonic oscillator, the apparatus comprising:
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a first current source adapted to provide a first current; a second current source adapted to provide a second current, the second current source having at least one complementary to absolute temperature (CTAT) configuration, proportional to absolute temperature (PTAT) configuration, or proportional to absolute temperature squared (PTAT2) configuration; a bias current monitor coupled to the first current source and the second current source, the bias current monitor adapted to detect a magnitude of the second current and to provide a control signal when the magnitude of the second current is equal to or greater than a predetermined magnitude; and a bias controller coupled to the bias current monitor, the bias controller adapted to switch the first current from the oscillator and to switch the second current to the oscillator in response to the control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of providing low-latency start-up for a harmonic oscillator, the method comprising:
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generating a first current; generating a second current, front a parameter-dependent current source having at least one complementary to absolute temperature (CTAT) configuration, proportional to absolute temperature (PTAT) configuration, or proportional to absolute temperature squared (PTAT2)configuration; generating a first reference voltage and a second reference voltage; comparing the first reference voltage to the second reference voltage; when the second reference voltage is greater than the first reference voltage, providing the first current to the oscillator; and when the second reference voltage is not greater than the first reference voltage, providing the second current to the oscillator. - View Dependent Claims (10, 11)
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12. A system for low-latency start-up of a free-running harmonic oscillator, the system comprising:
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a harmonic oscillator; a reference voltage generator adapted to generate a first reference voltage and a second reference voltage; a comparator coupled to the reference voltage generator, the comparator adapted to compare the first reference voltage to the second reference voltage and to provide a first comparison signal when the second reference voltage is greater than the first reference voltage and to provide a second comparison signal when the second reference voltage is not greater than the first reference voltage; a bias controller coupled to the comparator, the bias controller adapted to switch a first current to the harmonic oscillator in response to the first comparison signal and to switch a second current to the oscillator in response to the second comparison signal; and a parameter-dependent current source adapted to provide the second current, the parameter-dependent current source having at least one complementary to absolute temperature (CTAT) configuration, proportional to absolute temperature (PTAT) configuration, or proportional to absolute temperature squared (PTAT2) configuration. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A start-up apparatus for a free-running harmonic oscillator, the apparatus comprising:
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a reference voltage generator adapted to generate a first reference voltage and a second reference voltage; a comparator coupled to the reference voltage generator, the comparator adapted to compare the first reference voltage to the second reference voltage and to provide a first comparison signal when the second reference voltage is greater than the first reference voltage and to provide a second comparison signal when the second reference voltage is not greater than the first reference voltage; a bias controller coupled to the comparator, the bias controller adapted to switch a first current to the oscillator in response to the first comparison signal and to switch a second current to the oscillator in response to the second comparison signal; and a parameter-dependent current source adapted to provide the second current, the parameter-dependent current source having at least one complementary to absolute temperature (CTAT) configuration, proportional to absolute temperature (PTAT) configuration, or proportional to absolute temperature squared (PTAT2) configuration. - View Dependent Claims (19, 20, 21, 22, 23)
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24. An apparatus comprising:
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a harmonic oscillator, a first current source adapted to provide a first current; a second current source adapted to provide a second current, the second current source having at least one complementary to absolute temperature (CTAT) configuration, proportional to absolute temperature (PTAT) configuration, or proportional to absolute temperature squared (PTAT2) configuration; a bias current monitor coupled to the first current source and the second current source, the bias current monitor adapted to provide a control signal; and a bias controller coupled to the bias current monitor, the bias controller adapted to switch the first current from the oscillator in response to the control signal. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A start-up apparatus for a harmonic oscillator, the apparatus comprising:
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a reference voltage generator adapted to generate a reference voltage; a first current source adapted to provide a first current; a second current source adapted to provide a second current, the second current source having at least one complementary to absolute temperature (CTAT) configuration, proportional to absolute temperature (PTAT) configuration, or proportional to absolute temperature squared (PTAT2) configuration; a comparator coupled to the reference voltage generator, the comparator adapted to compare the reference voltage to a voltage proportional to the second current and to provide a control signal; a bias controller coupled to the comparator, the bias controller adapted to switch the first current from the oscillator in response to the control signal. - View Dependent Claims (35)
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Specification