Hardware delay compensation in digital phase locked loop
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United States of America Patent
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May 30, 2017
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app pub date -
Mar 9, 2016
filing date -
Mar 31, 2015
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Abstract
In a digital phase locked loop comprising a PLL loop including a first software-implemented controlled oscillator (SDCO) responsive to a control value to generate output phase and frequency values locked to a reference input signal, and a hardware-implemented controlled oscillator responsive to output phase and frequency values from said first SDCO to synthesize said clock signals, hardware delays are compensated for by sampling said synthesized clock signals, or derivatives thereof, to generate synthesized clock phase values. The synthesized clock signal phase values are compared with feedback phase values derived from the PLL loop to generate a compensation value to modify the synthesized clock signals or derivatives thereof.
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