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AC coupled level shifting circuit

  • US 9,941,884 B2
  • Filed: 08/31/2016
  • Issued: 04/10/2018
  • Est. Priority Date: 08/31/2016
  • Status: Active Grant
First Claim
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1. A system for adjusting a voltage level of a clock signal, the system comprising:

  • an input connection to receive an input clock signal having a first voltage level;

    an output connection to provide an output signal having a second voltage level greater than the first level;

    a capacitor coupled to the input connection;

    a first inverter coupled to the capacitor at an input node, the first inverter configured to provide the output signal to the output connection, the output connection connected in a feedback loop with the input node, the feedback loop configured to bias the first inverter at a threshold voltage for the first inverter, the first inverter comprising;

    a first transistor coupled to the input node, the output connection, and a voltage source, the voltage source providing a voltage at the second voltage level, wherein the threshold voltage is based on the second voltage level;

    a second transistor coupled to the input node, the output connection, and ground; and

    a resistor coupled between the input node and the output connection to form the feedback loop, wherein the capacitor is coupled to the input node to AC couple the input clock signal onto the threshold voltage such that changes in the input clock signal result in changes in the output signal from the first inverter; and

    a switch coupled between the capacitor and the first inverter, the switch having a first state to connect the capacitor and the first inverter and a second state to disconnect the capacitor and the first inverter.

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