CALIBRATION TECHNIQUES FOR FREQUENCY SYNTHESIZERS
First Claim
1. A frequency synthesizer comprising:
- an oscillator including configurable circuitry that defines an initial frequency of the oscillator for an initial input parameter; and
a calibration unit that adjusts the configurable circuitry based on a comparison of a signal indicative of the oscillator and a signal indicative of a reference, wherein the calibration unit initializes the signals indicative of the oscillator and the reference so that the signals are substantially in phase.
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Abstract
In one embodiment, this disclosure describes a frequency synthesizer for use in a wireless communication device, or similar device that requires precision frequency synthesis but small amounts of noise. In particular, the frequency synthesizer may include a phase locked loop (PLL) and an integrated voltage controlled oscillator (VCO). The frequency synthesizer may implement one or more calibration techniques to quickly and precisely calibrate the VCO. In this manner, the analog gain of the VCO can be significantly reduced, which may improve performance of the wireless communication device. Also, the initial state of the PLL may be improved to reduce lock time of the PLL, which may enhance performance of the wireless communication device.
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Citations
17 Claims
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1. A frequency synthesizer comprising:
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an oscillator including configurable circuitry that defines an initial frequency of the oscillator for an initial input parameter; and a calibration unit that adjusts the configurable circuitry based on a comparison of a signal indicative of the oscillator and a signal indicative of a reference, wherein the calibration unit initializes the signals indicative of the oscillator and the reference so that the signals are substantially in phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A frequency synthesizer comprising:
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an oscillator including configurable circuitry that defines an initial frequency of the oscillator for an initial input parameter; and means for adjusting the configurable circuitry based on a comparison of a signal indicative of the oscillator and a signal indicative of a reference, wherein the means for adjusting initializes the signals indicative of the oscillator and the reference so that the signals are substantially in phase. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for calibrating a frequency synthesizer comprising:
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comparing a signal indicative of an oscillator and a signal indicative of a reference; adjusting configurable circuitry connected to the oscillator so that the signals are substantially in phase such an initial frequency of the oscillator is set for an initial input parameter.
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Specification