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ANTIFUSE FPGA PDF

The antifuse technology, routing architecture, logic mod- ule, design automation, programming, testing and use of ACTTM antifuse FPGA ‘s are described. FPGA Architectures Overview. In this short article we discuss modern FPGA architectures (SRAM-based, flash-based, antifuse- based) and their applications. Imperial College, Digital System Design. Actel FPGAs. ◇ Uses antifuse technology. ◇ Based on channelled gate array architecture as shown below.

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As the number of bonding pads is limited for a given size of the chip, various multiplexing strategies are used for larger number of antifuses. Certain programmable logic devices PLDssuch as structured ASICsuse antifuse technology to configure logic circuits and create amtifuse customized design from a standard IC design.

Their disadvantage, however, is lower area efficiency compared to other types. Zener zap is frequently employed in mixed-signal circuits for trimming values of analog components.

A specialized structure optimized for the purpose can be employed where the antifuse is an integral part of the design. By using this site, you agree to the Terms of Use and Privacy Policy. May Learn how and when to remove this template message. Ordinarily for operation from mains voltagesthe lamps are wired in series. The spike is formed on and slightly below the silicon surface, just below the passivation layer without damaging it.

This programming, performed after manufacturing, is permanent and irreversible. Antifuses are best known for their use in mini-light or miniature style low-voltage Fpba tree lights.

From Wikipedia, the free encyclopedia. In the same fashion as with the Christmas lights described above, if the lamp failed, the entire voltage of the street lighting circuit thousands of volts was imposed across the insulating film in the cutout, causing it to rupture. They may be less susceptible to alpha particles which can cause circuits to malfunction. One approach for the ICs that use antifuse technology employs a thin barrier of non-conducting amorphous silicon between two metal conductors.

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When the failed lamp was finally changed, a new piece of film was also installed, once again separating the electrical contacts in the cutout. This article needs additional citations for verification. In some cases a combined circuit with zeners and transistors can be used to form a zapping matrix; with additional zeners, the trimming which uses voltages higher than the normal operational voltage of the chip can be performed even after packaging the chip.

In gpga way, the failed lamp was bypassed and illumination restored to the rest of the street. Views Read Edit View history. The larger, traditional, C7 and C9 style lights are wired in parallel and are rated to operate directly at mains voltage.

Antifuse – Wikipedia

The antifuse is made using wire with a high resistance coating and this antituse is coiled over the two vertical filament support wires inside the bulb. When a sufficiently high voltage is applied across the amorphous silicon it is turned into a polycrystalline silicon-metal alloy with a low resistancewhich is conductive.

Each individual street-lamp was equipped with a film cutout ; a small disk of insulating film that separated two contacts connected to the two wires leading to the lamp. It is therefore necessary to shift the manufacturing tolerances so that the lowest-value typically made is equal to or larger than the desired value. The antifuse is usually triggered using an approximately 5 mA current. Please help improve this article by adding citations to reliable sources.

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Encyclopedia

By this approach, it is possible only to lower the value of the resulting resistor. Occasionally, the insulation fails to break down on its own, but tapping the blown lamp will usually finish the job.

Often a special bulb with no antifuse and often a slightly different rating so it blows first as the voltage gets too high known as a “fuse bulb” is incorporated into the string of lights to protect against the possibility of severe overcurrent if too many bulbs fail. Formation of the conductive channel is performed by a dielectric breakdown forced by a high voltage pulse.

When the bulb blows, the entire mains voltage is applied across the single blown lamp.

antifuse Definition from PC Magazine Encyclopedia

Antifuses are widely used to permanently program integrated circuits ICs. Articles needing additional references from May All articles needing additional references. Because the series string would be rendered inoperable by a single lamp failing, each bulb has an antifuse installed within it.

Also circuits built via the antifuse’s permanent conductive paths may be faster than similar circuits implemented in PLDs using SRAM technology.

With a poly-diffusion antifuse, the high current density creates zntifusewhich melts a thin insulating layer between polysilicon and diffusion electrodes, creating a permanent resistive silicon link. An antifuse is an electrical device that performs the opposite function to a fuse.

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