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AC coupling modules for bias ladders

  • US 10,236,872 B1
  • Filed: 03/28/2018
  • Issued: 03/19/2019
  • Est. Priority Date: 03/28/2018
  • Status: Active Grant
First Claim
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1. A FET switch stack, including:

  • (a) a plurality of series-coupled FETs, including a first end FET having a first signal terminal and a second end FET having a second signal terminal;

    (b) a gate bias resistor ladder coupled to the gates of the series-coupled FETs and configured to be coupled to a gate control voltage that controls the ON or OFF switch state of each series-coupled FET; and

    (c) an AC coupling gate module coupled to at least one end of the gate bias resistor ladder and configured to be coupled to a radio frequency voltage source;

    wherein in response to the OFF switch state of each series-coupled FET, a signal applied to the first or second signal terminal is blocked from conduction through the plurality of series-coupled FETs, and wherein in response to the ON switch state of each series-coupled FET, a signal applied to the first or second signal terminal is conducted through the plurality of series-coupled FETs.

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