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Reference voltage generation circuit, regulator, and semiconductor device

  • US 10,067,522 B2
  • Filed: 12/28/2017
  • Issued: 09/04/2018
  • Est. Priority Date: 05/01/2015
  • Status: Active Grant
First Claim
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1. A semiconductor device comprising:

  • a reference voltage generation circuit including;

    a first reference voltage source operable to generate a first reference voltage;

    a second reference voltage source operable to generate a second reference voltage, the second reference voltage having a temperature response different from a temperature response of the first reference voltage;

    a first comparator operable to compare the first and second reference voltages with each other to generate a first comparison signal; and

    a selector operable selectively to output one of the first and second reference voltages as a reference voltage according to the first comparison signal;

    a third reference voltage source operable to generate a third reference voltage, the third reference voltage having a temperature response different from either of the temperature responses of the first and second reference voltages;

    a second comparator operable to compare the second and third reference voltages with each other to generate a second comparison signal; and

    a logic operator operable to generate a switching signal from the first and second comparison signals,wherein the selector is operable to select one of the first, second, or third reference voltages as the reference voltage according to the switching signal,wherein the semiconductor device further comprises;

    a pre-regulator operable to generate a first internal supply voltage and a second internal supply voltage from an input voltage; and

    a regulator operable to generate a constant voltage from the first internal supply voltage,wherein the reference voltage generation circuit is operable to generate the reference voltage by being supplied with the second internal supply voltage from the pre-regulator, andthe regulator is operable to perform output feedback control so as to keep equal the constant voltage or a feedback voltage commensurate therewith and the reference voltage.

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