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APPARATUS AND METHOD FOR A PVT INDEPENDENT RC DELAY

  • US 20180167057A1
  • Filed: 12/08/2016
  • Published: 06/14/2018
  • Est. Priority Date: 12/08/2016
  • Status: Active Grant
First Claim
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1. A delay circuit configured to receive an input signal and to provide a delayed representation of the input signal at an output, the delay circuit comprising:

  • a resistor configured to pass a compensation current;

    a capacitor configured to receive a charge current based on the compensation current;

    a first compensation circuit configured to provide a control signal, the first compensation circuit comprising;

    an inverter circuit configured to track an inverter threshold voltage across process, voltage and temperature variations, wherein an output of the inverter circuit is directly coupled to an input of the inverter circuit;

    an amplifier configured to receive the output of the inverter circuit an provide the control signal; and

    a charge-current coupling circuit configured to receive the control signal and to provide the compensation current and the charge current.

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