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MOS threshold control circuit

  • US 4,791,318 A
  • Filed: 12/15/1987
  • Issued: 12/13/1988
  • Est. Priority Date: 12/15/1987
  • Status: Expired due to Term
First Claim
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1. Apparatus for controlling a threshold voltage of a circuit including an MOS operating device having a back gate, comprising:

  • a reference stage including an input, an output and an MOS reference device having a back gate;

    means for applying a reference voltage VR to the input of said reference stage, said reference voltage VR being equal to the desired circuit threshold voltage; and

    feedback means for providing a control voltage to the back gate of said MOS reference device for maintaining a prescribed relationship between said reference voltage and a voltage VX at said output, said control voltage being coupled to the back gate of said MOS operating device.

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