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Adaptable MOS current mirror

  • US 5,160,899 A
  • Filed: 10/22/1991
  • Issued: 11/03/1992
  • Est. Priority Date: 12/09/1988
  • Status: Expired due to Term
First Claim
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1. An adaptable MOS current mirror fabricated on a semiconductor substrate, said adaptable MOS current mirror having an input node and an output node and including:

  • first and second MOS transistors, each having a source, a gate, and a drain;

    a first MOS capacitor having first and second electrodes;

    the source of said first MOS transistor being connected to a source of fixed voltage, the gate and drain of said first MOS transistor being connected to said input node and to said first electrode of said first MOS capacitor, the source of said second MOS transistor being connected to a source of fixed voltage, the gate of said MOS transistor comprising a floating node connected to said second electrode of said first capacitor, the drain of said second MOS transistor forming said output node;

    means for generating a first electrical control signal;

    electron removal means coupled to said floating node and responsive to said means for generating said first electrical control signal, for removing electrons from said floating node, said electron removal means operating to vary the rate of removal of electrons from said floating gate in response to the magnitude of said first electrical control signal;

    means for selectively supplying a calibration current to said input node during adaptation;

    means for generating a second electrical control signal during adaptation;

    electron injecting means coupled to said floating node and responsive to said second electrical control signal for injecting electrons on to said floating node, said electron injecting means operating to vary the rate of injection of electrons on to said floating node in response to the magnitude of said second electrical control signal;

    whereby the output current of said current mirror is adapted to be equal to said desired output current when its input current is equal to said calibration current.

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