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Depletion MOSFET driver

  • US 9,806,553 B2
  • Filed: 06/26/2013
  • Issued: 10/31/2017
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A current driven depletion-mode MOSFET-based driver circuit comprising:

  • a. a depletion-mode MOSFET having a first terminal, a second terminal and a gate, wherein the first terminal is coupled to a power supply;

    b. an output capacitor having a first terminal and a second terminal, wherein the second terminal of the output capacitor is coupled to be in direct electrical contact with ground;

    c. a Zener diode having a cathode coupled to be in direct electrical contact with the second terminal of the depletion mode MOSFET and an anode coupled to be in direct electrical contact with the first terminal of the output capacitor;

    d. a voltage divider coupled to be in direct electrical contact with the first terminal of the output capacitor;

    e. a transistor having a first terminal to receive a driving voltage, a second terminal and a third terminal coupled to be in direct electrical contact with ground, wherein the first terminal of the transistor is coupled to be in direct electrical contact with the voltage divider, and the second terminal of the transistor is coupled to be in direct electrical contact with the gate of the depletion-mode MOSFET; and

    f. a resistor having a first terminal and a second terminal, wherein the first terminal of the resistor is coupled to be in direct electrical contact with the cathode of the Zener diode and is coupled to be in direct electrical contact with the second terminal of the depletion-mode MOSFET, and the second terminal of the resistor is coupled to be in direct electrical contact with the gate of the depletion-mode MOSFET and is coupled to be in direct electrical contact with the second terminal of the transistor such that a connection is formed between the second terminal of the depletion-mode MOSFET and the gate of the depletion-mode MOSFET via the resistor.

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