QUADRATURE CLOCK GENERATION WITH INJECTION LOCKING
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United States of America
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May 25, 2018
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May 25, 2018
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Abstract
Aspects of the disclosure are directed to quadrature clock generation with injection locking. In accordance with one aspect, quadrature clock generation with injection locking uses a digital calibration circuit having a coarse calibration circuit and a fine calibration circuit to perform a coarse frequency calibration of a controlled oscillator, wherein the controlled oscillator is coupled to the digital calibration circuit; characterize a replica oscillator signal path associated with an oscillator replica circuit, wherein the oscillator replica circuit is coupled to the controlled oscillator; perform a fine frequency calibration of the controlled oscillator by measuring a phase difference between the controlled oscillator and the oscillator replica circuit; and generate a calibrated set of quadrature clock signals after performing the fine frequency calibration of the controlled oscillator.
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