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Synthetic ripple regulator

  • US 7,132,820 B2
  • Filed: 05/25/2004
  • Issued: 11/07/2006
  • Est. Priority Date: 09/06/2002
  • Status: Expired
First Claim
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1. A synthetic ripple voltage generator for a DC-DC regulator having a hysteretic comparator that develops a pulse width modulation (PWM) signal provided to a switching circuit that switches an input voltage via a phase node through an output inductor to develop an output voltage at an output node, said synthetic ripple voltage generator comprising:

  • a transconductance amplifier circuit having an input for coupling to the output inductor and an output for coupling to an input of the hysteretic comparator; and

    a ripple capacitor coupled to said output of said transconductance amplifier circuits;

    wherein said transconductance amplifier circuit provides current to said ripple capacitor which develops a voltage indicative of ripple current through the output inductor.

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