AC coupling modules for bias ladders

  • US 10,630,280 B2
  • Filed: 01/29/2019
  • Issued: 04/21/2020
  • Est. Priority Date: 03/28/2018
  • Status: Active Grant
First Claim
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1. A method for providing a FET switch stack, including:

  • (a) providing 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, wherein the plurality of series-coupled FETs includes one or more series-coupled positive-logic FETs requiring a relative negative VGS to turn OFF but configured to not require a negative power supply, and a first end-cap FET that turns OFF when the VGS of such first end-cap FET is essentially zero volts, series-coupled to a first end of the one or more series-coupled positive-logic FETs;

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

    (c) coupling an AC coupling gate module to at least one end of the gate bias resistor ladder and configuring the AC coupling gate module 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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