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Programmable low dropout regulators with fast transient response when programming output voltage

  • US 10,310,527 B2
  • Filed: 10/16/2017
  • Issued: 06/04/2019
  • Est. Priority Date: 08/17/2015
  • Status: Active Grant
First Claim
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1. A power amplifier system comprising:

  • a power amplifier configured to provide amplification to a radio frequency signal; and

    a programmable low dropout regulator having an output that powers at least one stage of the power amplifier with an output voltage that is programmable to a plurality of different voltage levels, the programmable low dropout regulator including an output capacitor electrically connected to the output, a regulation transistor having a drain electrically connected to the output capacitor and configured to charge the output capacitor in response to programming the output voltage from a low voltage level to a high voltage level, an amplifier configured to control a gate voltage of the regulation transistor, and an alternative discharge circuit configured to activate to discharge the output capacitor in response to programming the output voltage from the high voltage level to the low voltage level.

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