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Digital sub-regulators

  • US 9,899,922 B1
  • Filed: 02/13/2017
  • Issued: 02/20/2018
  • Est. Priority Date: 02/13/2017
  • Status: Active Grant
First Claim
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1. A regulator, comprising:

  • a variable-impedance switch coupled between a supply rail and a circuit block, wherein an impedance of the variable-impedance switch is set by an impedance code input to the variable-impedance switch;

    an analog-to-digital converter (ADC) configured to convert a block supply voltage at the circuit block into a voltage code; and

    a controller configured to adjust the impedance code based on the voltage code in a direction that reduces a difference between the block supply voltage and a target supply voltage;

    wherein the controller is configured to adjust the impedance code by a first amount within a period of time in response to a voltage droop on the block supply voltage, and to adjust the impedance code by a second amount within the period of time in response to a voltage overshoot on the block supply voltage, wherein a magnitude of the first amount is larger than a magnitude of the second amount, and the voltage droop and the voltage overshoot have approximately a same magnitude.

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