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Using a switching signal delay to reduce noise from a switching power supply

  • US 9,250,643 B2
  • Filed: 11/30/2012
  • Issued: 02/02/2016
  • Est. Priority Date: 11/30/2011
  • Status: Active Grant
First Claim
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1. Circuitry comprising:

  • a power supply output; and

    power supply switching circuitry adapted to provide;

    a first switching output signal to a first inductive element; and

    a second switching output signal to a second inductive element, such that the second switching output signal is delayed from the first switching output signal by a switching signal delay, wherein;

    the first inductive element is coupled between the power supply switching circuitry and the power supply output;

    the second inductive element is coupled between the power supply switching circuitry and the power supply output;

    the first inductive element is adapted to have a first inductor current; and

    the second inductive element is adapted to have a second inductor current, such that the first inductor current and the second inductor current combine to provide a combined inductor current, which has a frequency response with a plurality of notches, such that frequency locations of the plurality of notches are based on the switching signal delay.

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