Oscillator system with switched-capacitor network and method for generating a precision time reference
First Claim
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1. An oscillator system comprising:
- an oscillator sub-circuit to generate an oscillation frequency; and
an amplitude-limiter sub-circuit to provide feedback to the oscillator sub-circuit to control an amplitude level of the oscillation frequency, wherein the amplitude-limiter sub-circuit includes a switched-capacitor network to control the feedback based on a switching frequency and the amplitude level of the oscillation frequency.
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Abstract
Briefly, in accordance with embodiments of the invention, switched capacitors may be utilized to emulate resistors in a longer time constant feedback network for amplitude regulation of a crystal oscillator.
20 Citations
24 Claims
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1. An oscillator system comprising:
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an oscillator sub-circuit to generate an oscillation frequency; and
an amplitude-limiter sub-circuit to provide feedback to the oscillator sub-circuit to control an amplitude level of the oscillation frequency, wherein the amplitude-limiter sub-circuit includes a switched-capacitor network to control the feedback based on a switching frequency and the amplitude level of the oscillation frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of generating a precision time reference comprising:
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generating an oscillation frequency; and
providing a switching frequency to a switched-capacitor network to generate feedback to control an amplitude level of the oscillation frequency. - View Dependent Claims (13, 14, 15)
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16. An oscillator system comprising:
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an oscillator circuit to generate an oscillation frequency;
a switching-frequency generator to provide a switching frequency to the oscillator circuit as a multiple of the oscillation frequency; and
a buffer-amplifier circuit to instruct the switching-frequency generator to generate the multiple of the oscillation frequency when the oscillation frequency is determined to be stable. - View Dependent Claims (17, 18, 19)
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20. A system comprising:
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an omni-directional antenna to communicate RF signals;
a receiver to convert the RF signals to data signals; and
an oscillator system to provide a precision time reference to the receiver for use in converting the RF signals to the data signals, the oscillator system comprising an oscillator circuit to generate an oscillation frequency, a switching-frequency generator to provide a switching frequency to the oscillator circuit as a multiple of the oscillation frequency, and a buffer-amplifier circuit to generate the precision timing reference from the oscillation frequency. - View Dependent Claims (21, 22, 23, 24)
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Specification