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US 11,114,176 B1Granted
Systems and methods to provide write termination for one time programmable memory cells
AssigneeQUALCOMM Incorporated
InventorsHochul Lee, Anil Chowdary Kota, Keejong Kim
Life of this patent
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Abstract
A One Time Programmable (OTP) memory, includes: a first driver coupled to a reference cell by a first bit line; a second driver coupled to an OTP cell by a second bit line; and a comparator having a first input coupled to the first bit line and the reference cell, a second input coupled to the second bit line and the OTP cell, and an output coupled to a logic circuit configured to control the first driver and the second driver.
Claims30
A One Time Programmable (OTP) memory, comprising:
- a first driver coupled to a reference cell by a first bit line;
- a second driver coupled to an OTP cell by a second bit line;
- and
- a comparator having a first input coupled to the first bit line and the reference cell, a second input coupled to the second bit line and the OTP cell, and an output coupled to a logic circuit configured to control the first driver and the second driver.
1 more element
A method comprising:
- applying a driver control signal to a first driver coupled to a reference cell by a first bit line;
- applying the driver control signal to a second driver coupled to an OTP cell by a second bit line;
- generating a first current by the first driver, thereby generating a reference voltage at a first input of a comparator that is coupled to the first bit line;
- generating a second current by the second driver, thereby generating an OTP cell voltage at a second input of the comparator that is coupled to the second bit line;
- adjusting the driver control signal in response to a change of the OTP cell voltage associated with the OTP cell being blown by the second current;
- changing an output signal of the comparator;
- and
- adjusting the driver control signal based on the output signal of the comparator.
5 more elements
A Read Only Memory (ROM), comprising:
- means for producing a first current on a first bit line;
- means for producing a second current on a second bit line;
- a reference resistor coupled between the first bit line and a ground;
- a One Time Programmable (OTP) cell coupled between the second bit line and the ground;
- and
- means for turning off the second current producing means in response to a change in a voltage at the second bit line relative to a voltage at the first bit line.
3 more elements
Dependencies are inferred from the claim text.