Apparatus and methods for biasing radio frequency switches

  • US 9,712,158 B1
  • Filed: 04/07/2016
  • Issued: 07/18/2017
  • Est. Priority Date: 04/07/2016
  • Status: Active Grant
First Claim
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1. A radio frequency (RF) switching circuit comprising:

  • a field effect transistor (FET) switch electrically connected along a signal path; and

    an adaptive biasing circuit configured to generate a bias voltage, wherein a gate of the FET switch is biased in part by the bias voltage, the adaptive biasing circuit comprising;

    a low pass filter configured to generate a low pass filtered voltage based on low pass filtering a signal path voltage of a node of the signal path;

    a buffer circuit configured to receive the low pass filtered voltage and to generate a buffered voltage; and

    a voltage shifting circuit configured to generate the bias voltage by shifting the buffered voltage by an amount of voltage that changes based on a state of a switch control signal.

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