Radio frequency (RF) switch with on and off switching acceleration

  • US 10,044,349 B2
  • Filed: 05/03/2017
  • Issued: 08/07/2018
  • Est. Priority Date: 01/08/2016
  • Status: Active Grant
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First Claim
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1. A radio frequency (RF) switch comprising:

  • two or more stages coupled in series between an RF input terminal and an RF output terminal, each stage comprising;

    a gate resistor coupled between a control input and a control output;

    a first field-effect transistor (FET) having a first current terminal coupled to the control input and a second current terminal coupled to the control output to shunt the gate resistor when the first FET is on, and a first control terminal for controlling an on/off state of the first FET;

    an RF switching device having a third current terminal coupled to a signal input, a fourth current terminal coupled to a signal output to pass an RF signal between the signal input and the signal output when the RF switching device is on, and a second control terminal coupled to the control output for controlling an on/off state of the RF switching device, wherein the signal input of a first stage of the two or more stages is communicatively coupled to the RF input terminal, and the signal output of a last stage of the two or more stages is coupled to the RF output terminal and the signal output of a proceeding stage of the two or more stages is coupled to the signal input of a following stage of the two or more stages;

    a second FET having a fifth current terminal coupled to the signal input and a sixth current terminal coupled the signal output to shunt the RF switching device when the second FET is on, and a third control terminal coupled to an acceleration output for controlling an on/off state of the second FET; and

    a third FET having a seventh current terminal coupled to the first control terminal of the first FET, an eighth current terminal coupled to the signal input for controlling charge on a gate of the first FET, and a fourth control terminal coupled to an acceleration input for controlling an on/off state of the third FET.

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