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One-time programmable bitcell with diode under anti-fuse

  • US 10,529,436 B1
  • Filed: 01/16/2018
  • Issued: 01/07/2020
  • Est. Priority Date: 01/17/2017
  • Status: Active Grant
First Claim
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1. A one-time programmable memory device comprising a plurality of bitcells arranged in an array comprising rows and columns, a first bitcell of the plurality of bitcells comprising:

  • a first doped region implanted in a semiconductor substrate, wherein the first doped region connects the first bitcell to a first subset of the plurality of bitcells in one of the rows of the array;

    a first contact coupled to the first doped region for applying a voltage to the first doped region;

    a second doped region implanted within the first doped region, the first doped region and the second doped region forming a diode; and

    a gate positioned over the second doped region, the gate comprising a dielectric portion capacitively coupled to the second doped region and a conductive portion, the conductive portion coupled to a second contact for applying a voltage to the conductive portion, the voltage applied to the conductive portion independent from the voltage applied to the first doped region, the first bitcell programmed by forming a rupture in the dielectric portion of the gate, wherein the gate connects the first bitcell to a second subset of the plurality of bitcells in one of the columns of the array,wherein, in response to reverse biasing the diode formed by the first doped region and the second doped region, the voltage of the second doped region is based on a reverse bias diode leakage and a tunneling current through the dielectric portion of the gate.

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