Tuning voltage tracker for receive/transmit phase-locked loop (PLL) fast switching
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United States of America Patent
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May 14, 2024
Grant Date -
Mar 28, 2024
app pub date -
Sep 23, 2022
filing date -
Sep 23, 2022
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Abstract
Methods and apparatus for storing a control voltage of a phased-locked loop (PLL) when switching from mission mode to standby mode for the PLL, and for restoring the control voltage of the PLL when switching back to mission mode. An example PLL circuit includes a charge pump, a voltage-controlled oscillator (VCO) having a control input coupled to an output of the charge pump via a node, and a tracking circuit coupled to the node. The tracking circuit is generally configured to sample a voltage of the node during a mission mode, save a representation of the sampled voltage before entering a standby mode, and restore the sampled voltage to the node for reentering the mission mode using the saved representation of the sampled voltage.
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