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System and method for suppressing load transients in radio frequency power amplifier switching power supplies

  • US 7,701,690 B1
  • Filed: 01/15/2008
  • Issued: 04/20/2010
  • Est. Priority Date: 01/15/2008
  • Status: Active Grant
First Claim
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1. A power supply control circuit comprising:

  • a low drop out circuit that comprises an operational amplifier having an output coupled to a low drop out transistor;

    a switcher circuit having an output coupled to the low drop out circuit, the switcher circuit configured to provide a switcher operating voltage to the low drop out transistor; and

    load transient suppression circuitry configured to suppress a load transient in the switcher operating voltage that is provided to the low drop out transistor, wherein the load transient suppression circuitry comprises;

    a preload control signal circuit configured to generate a preload control signal;

    an active current source responsive to the preload control signal;

    a comparator configured to determine whether a specified load is present at the output of the low drop out circuit; and

    a flip flop circuit configured to reset the preload control signal when the comparator determines that the specified load is present at the output of the low drop out circuit.

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