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In-cell differential read-out circuitry for reading signed weight values in resistive processing unit architecture

  • US 10,468,098 B2
  • Filed: 03/14/2019
  • Issued: 11/05/2019
  • Est. Priority Date: 03/30/2018
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • receiving, by a resistive processing unit (RPU) cell, a read control signal to read a weight of the RPU cell, wherein the weight of the RPU cell comprises a weight value and a weight sign;

    in response to the read control signal, the RPU cell generating a read current based on the weight of the RPU cell, and outputting the read current to an output port of the RPU cell;

    wherein the read current is generated as a difference between a first current and a second current;

    wherein the read current comprises a magnitude and sign which represent the weight value and the weight sign, respectively, of the RPU cell;

    wherein the sign of the read current is deemed positive when the first current is greater than the second current; and

    wherein the sign of the read current is deemed negative when the first current is less than the second reference current.

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