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Semiconductor device and variation information obtaining program

  • US 9,094,021 B2
  • Filed: 03/03/2013
  • Issued: 07/28/2015
  • Est. Priority Date: 03/30/2012
  • Status: Active Grant
First Claim
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1. A semiconductor device, comprising:

  • an oscillation circuit, including a transistor, configured to output a signal having a predetermined frequency; and

    a control circuit, coupled to the oscillation circuit, configured to;

    output a current set value to set an operation current of the oscillation circuit to a first current value,obtain first frequency information related to the frequency of the output signal of the oscillating circuit when the operation current is set to the first current value,output the current set value to set the operation current of the oscillation circuit to a second current value,obtain second frequency information related to the frequency of the output signal of the oscillation circuit when the operation current is set to the second current value,obtain manufacture variation information, including a variation amount of a threshold voltage of the transistor, based on a difference between the first and second frequency information, andcorrect the current set value used for oscillating operation of the oscillator circuit based on the variation amount of the threshold voltage of the transistor.

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