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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Because the series string would be rendered inoperable by a single lamp failing, each bulb has an antifuse installed within it. Unsourced material may be challenged and removed. Often a special bulb with no antifuse and often a slightly different rating antifusf 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.

Please help improve this article by adding citations to reliable sources. Views Read Edit View history. Antifuses are best known for their use in mini-light or miniature style low-voltage Christmas tree lights. 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.

Encyclopedia

The insulation of the antifuse wire withstands the ordinary low voltage imposed across a functioning lamp but rapidly breaks antifusse under the full mains voltage, giving the antifuse action. 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. Also circuits built via the antifuse’s permanent conductive paths may be faster than similar circuits implemented in PLDs using SRAM technology.

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. Formation of the conductive channel is performed by a dielectric breakdown forced by a high voltage pulse.

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Antifuse – Wikipedia

Occasionally, the insulation fails to break down on its own, but tapping the blown lamp will usually finish the job. An atifuse is an electrical device that performs the opposite function to a fuse.

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. Amorphous silicon is a material usually ahtifuse used in either bipolar or CMOS processes and requires an additional manufacturing step. The spike is formed on and slightly below the silicon surface, just below the passivation layer without damaging it.

antifuse Definition from PC Magazine Encyclopedia

Zener diodes can be used as antifuses. 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 antjfuse packaging the chip.

By using this site, you agree to the Terms of Use and Privacy Policy. This fpta has many applications. The resulting resistance of the junction is in the range of 10 ohms. The parallel resistors cannot have too low value as that would sink the zapping current; a series-parallel combination of resistors and antifuses is employed in such cases.

From Wikipedia, the free encyclopedia. When the failed lamp was finally changed, a new piece of film was also installed, once again separating the electrical contacts in the cutout. In this way, the failed lamp was bypassed and illumination restored to the rest of the street. A standard NPN transistor structure is often used in common bipolar processes as the antifuse.

By this approach, it is possible only to lower the value of the resulting resistor. They are historically used especially with bipolar processes, where the thin oxide needed for dielectric antifuses is not available.

Retrieved from ” https: This article needs additional citations for verification. 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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The conductive shunt therefore does not compromise integrity and reliability of the semiconductor device.

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

Antifuses are widely used to permanently program integrated circuits ICs. This programming, performed after manufacturing, is permanent and irreversible. 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 limitan 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.

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.

The antifuse is usually triggered using an approximately 5 mA current.

antifusr 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.

Unlike Christmas lights, the circuit usually contained an automatic device to regulate the electric current flowing in the circuit, preventing the current from rising as additional lamps burned out. Certain programmable logic devices PLDssuch as structured ASICsuse antifuse technology to configure logic circuits and create a customized design from a standard IC design.