Thin film transistor redundancy structure
First Claim
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1. In a microcircuit device wherein a voltage differential is applied to at least one element of said microcircuit device, said voltage differential being incompatible with a plurality of said microcircuit components;
- means for isolating said components from said voltage differential, which comprise;
at least one first TFT switching circuit adapted to apply said voltage differential to said element; and
at least one second TFT switching circuit adapted to separate said components from said voltage differential.
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Abstract
In a microcircuit device such as a memory chip, where a bank of state devices such as fuses and anti-fuses determine the enabling and disabling of redundant circuitry, a scheme for blowing one or more state devices by applying a programming voltage through a switching circuit comprising thin film transistors (TFTs) which are not damaged by the device blowing, programming voltage. The TFTs can be activated by a low voltage enable signal provided by a state device designator logic module.
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15 Claims
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1. In a microcircuit device wherein a voltage differential is applied to at least one element of said microcircuit device, said voltage differential being incompatible with a plurality of said microcircuit components;
- means for isolating said components from said voltage differential, which comprise;
at least one first TFT switching circuit adapted to apply said voltage differential to said element; and at least one second TFT switching circuit adapted to separate said components from said voltage differential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- means for isolating said components from said voltage differential, which comprise;
Specification