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Low drop-out regulator and display device including the same

  • US 9,983,604 B2
  • Filed: 10/05/2015
  • Issued: 05/29/2018
  • Est. Priority Date: 10/05/2015
  • Status: Active Grant
First Claim
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1. A low drop-out (LDO) regulator, comprising:

  • a pass transistor configured to regulate an input according to a control signal; and

    a compensation circuit configured to provide a negative capacitance to a gate node of the pass transistor,wherein;

    the compensation circuit further comprises a source follower circuit connected to an input terminal of a non-inverted amplifier;

    the source follower circuit has a transistor comprising;

    a first electrode connected to a power supply;

    a second electrode connected to a current sink circuit; and

    a gate electrode configured to receive the control signal;

    the control signal is formed based on feedback associated with the pass transistor, a reference input, and the negative capacitance; and

    an absolute value of the negative capacitance is substantially equivalent to a sum of a parasitic capacitance associated with a first node connected to a gate electrode of the pass transistor and a parasitic capacitance between gate and drain electrodes of the pass transistor.

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