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Reference voltage generator for hysteresis circuit

  • US 6,933,760 B2
  • Filed: 09/19/2003
  • Issued: 08/23/2005
  • Est. Priority Date: 09/19/2003
  • Status: Expired due to Fees
First Claim
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1. A hysteresis circuit, comprising:

  • a sensing amplifier to generate an output signal having an output and two inputs with one of the inputs coupled to an input signal;

    a reference generator coupled to the output and the other one of the inputs of the sensing amplifier and responsive to the output signal to generate an output reference voltage;

    the reference generator including a first originator circuit to generate a first reference voltage on a first reference voltage node;

    a second originator circuit to generate a second reference voltage on a second reference voltage node;

    a selector circuit coupled to the first and second originator circuits to provide as the output reference voltage either the first or second reference voltage based upon the output signal undertaking a falling signal transition or a rising signal transition respectively;

    a voltage supply; and

    a ground;

    the first originator circuit including a first p-channel device and a second p-channel device coupled in parallel between the voltage supply and the first reference voltage node; and

    the second originator circuit including a first n-channel device and a second n-channel device coupled in parallel between the second reference voltage node and the ground.

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