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Voltage comparator having hysteresis characteristics

  • US 7,417,471 B2
  • Filed: 06/30/2006
  • Issued: 08/26/2008
  • Est. Priority Date: 08/02/2005
  • Status: Expired due to Fees
First Claim
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1. A voltage comparator having hysteretic characteristics, said voltage comparator comprising:

  • a comparing section for comparing an input voltage with a reference voltage so as to output a high-level signal or a low-level signal; and

    a reference voltage changing section for changing the reference voltage when the low-level signal is outputted from the comparing section;

    wherein the comparing section includes;

    a switching section that is driven by the input voltage and the reference voltage;

    a voltage drop unit that is connected to the switching section and a ground terminal so as to generate a voltage drop;

    a signal output section that is connected to the voltage drop unit so as to output the high-level or low-level signal through an output terminal; and

    a bias current section that is connected to the switching section and the signal output section so as to maintain a constant amount of current.

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