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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The p-n junction that serves as such diode is overloaded with a current spike and overheated.

In this way, the failed lamp was bypassed and illumination restored to the rest of the street. Unsourced material may be challenged and removed. When a sufficiently high voltage is applied across the amorphous silicon it is turned into a polycrystalline silicon-metal alloy anyifuse a low resistanceantfuse is conductive. This article needs additional citations for verification. The conductive shunt therefore does not compromise integrity and reliability of the semiconductor device.

The resulting resistance of the junction is in the range of 10 ohms. Please help improve this article by adding citations to reliable sources.

Antifuse – Wikipedia

Antifuses are best known for their use in mini-light or miniature style low-voltage Christmas tree lights. They are historically used especially with bipolar processes, where the thin oxide needed for dielectric antifuses is not available.

Occasionally, the insulation fails to break down on its own, but tapping the fpgw lamp will usually finish the job. This programming, performed after manufacturing, is permanent and irreversible. Ordinarily for operation from mains voltagesthe lamps are wired in series. As the number of bonding pads is limited for a given size of the chip, various multiplexing strategies are used for larger number antiguse antifuses.

The terminals of the antifuses are antifuwe accessible as bonding pads and the trimming process is performed before wire-bonding and encapsulating the chip. This technology has many applications. When the bulb blows, the entire mains voltage is applied across the single blown lamp. Each bit fpgga both a fuse and an antifuse and antifusd programmed by triggering one of the two.

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The antifuse is made using wire with a high resistance coating and this wire is coiled over the two vertical filament support wires inside the bulb. In the same fashion as with the Anfifuse 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. QuickLogic Corporation refers to their antifuses as “ViaLinks” because blown fuses create a connection between two crossing layers of wiring on the chip in the same way that a via on a printed circuit board creates a connection between copper layers.

The insulation of the antifuse wire withstands the ordinary low voltage imposed across a functioning lamp but rapidly breaks down under the full mains voltage, giving the antifuse action. By this approach, it is possible only to antiuse the value of the resulting resistor. Retrieved from ” https: Each individual street-lamp was equipped with a film cutout ; a small disk of anticuse film that separated two contacts connected to the two wires leading to the lamp.

This rapidly causes the antifuse to short out the blown bulb, allowing the series circuit to resume functioning, albeit with a larger proportion of the mains voltage now applied to each of the remaining lamps.

Often a special bulb with no antifuse and often antiduse 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.

The spike is formed on and slightly below the silicon surface, just below the passivation layer without damaging it.

Encyclopedia

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.

This page was last edited on 7 Julyat For example a precision resistor can be manufactured by forming several series resistors with Zeners in parallel oriented to be nonconductive during normal operation of the device and then shorting selected Zeners to shunt the unwanted resistors. Formation of the conductive channel is performed by a dielectric breakdown forced by a high voltage pulse.

With a poly-diffusion antifuse, the high current density creates heatwhich melts a thin insulating layer between polysilicon and diffusion electrodes, creating a permanent resistive silicon link.

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An antifuse is an electrical device that performs the opposite function to a fuse. Certain programmable logic devices PLDssuch as structured ASICsuse antifuse technology to configure logic circuits and create a customized design from a standard IC design. Zener diodes can be used as antifuses. In a similar fashion to that of Christmas tree lights, before the advent of high-intensity discharge lampsstreet light circuits using incandescent light bulbs were often operated as high-voltage series circuits.

Also circuits built via the antifuse’s permanent conductive paths may be faster than similar circuits implemented in PLDs using SRAM technology. They may be less susceptible to alpha particles which can cause circuits to malfunction. The antifuse is usually triggered using an approximately 5 mA current.

May Learn how and when to remove this template message. Antifuses are widely used to permanently program integrated circuits ICs. Articles needing additional references from May All articles needing additional references.

The larger, traditional, C7 and C9 style lights are wired in parallel and are rated to operate directly at mains voltage. Atnifuse the failed lamp was finally changed, a new piece of film was also installed, once again separating the electrical contacts in the cutout. Whereas a fuse starts with a low resistance and is designed to permanently break an electrically conductive path typically when the current through the path exceeds a specified fphaan antifuse starts with a high resistance and is designed to permanently create an electrically conductive path typically when the voltage across the antifuse exceeds a certain level.

By using this site, you agree fpgx the Terms of Use and Privacy Policy. Unlike Christmas lights, the circuit usually contained an automatic device to regulate the electric current flowing in the circuit, preventing pfga current from rising as additional lamps burned out. Their disadvantage, however, is lower area efficiency compared to other types. A standard NPN transistor structure is often used in common bipolar processes as the antifuse.