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Driver circuit for converting a CMOS level signal to a high-voltage level

  • US 5,120,991 A
  • Filed: 01/12/1990
  • Issued: 06/09/1992
  • Est. Priority Date: 05/16/1988
  • Status: Expired due to Term
First Claim
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1. A driver circuit comprising:

  • a first MOS transistor having a source, a gate, and a drain, one of the source and drain being connected to a first power source voltage;

    a diode connected between the other of said source and drain of said first MOS transistor and an output terminal;

    a second MOS transistor having a source, a gate, and a drain, the drain and the source being respectively connected to said output terminal and a ground voltage, and the gate receiving a first drive signal;

    a constant voltage element inserted between the gate of said first MOS transistor and the other of said source and drain of said first MOS transistor;

    a third MOS transistor having a source, a gate, and a drain, the drain and the source being respectively connected to said gate of said first MOS transistor and the ground voltage, and the gate receiving a second drive signal;

    a bipolar transistor having an emitter, a collector, and a base, wherein the emitter is connected to the first power source voltage and the collector is connected to said gate of said first MOS transistor;

    current control means, for controlling a value of current supplied to the base of said bipolar transistor in accordance with a plurality of third drive signals; and

    drive signal generating means, for generating the first drive signal, the second drive signal, and the plurality of third drive signals on the basis of an input signal and a control signal.

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