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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From Wikipedia, the free encyclopedia.

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.

Amorphous silicon is a material usually not used in either bipolar or CMOS processes and requires an additional manufacturing step. In the same fashion as with the Antiruse 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.

antifuse Definition from PC Magazine 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. The antifuse is antifusse using wire with a high resistance coating and this wire is coiled over the two vertical filament support wires inside the bulb.

Retrieved from ” https: Views Read Edit View history. By this approach, it is possible only to lower the value of the resulting resistor. Antifuses may be used in programmable read-only memory PROM.

Antifuse – Wikipedia

This programming, performed after manufacturing, is permanent and irreversible. Please help improve this article by adding citations to reliable sources. 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. 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.

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Encyclopedia

Each bit contains both a fuse and an antifuse and is programmed by triggering one of the two. The larger, traditional, Antiguse and C9 style lights are wired in parallel and are rated to operate directly at mains voltage.

May Learn how and when to remove this template message. Certain programmable logic devices PLDssuch as structured ASICsuse antifuse technology to configure logic circuits and create a customized design from a standard Antjfuse design. 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.

An antifuse is an electrical device that performs the opposite function to a fuse.

The parallel resistors antifse have too low value as that would sink the zapping current; wntifuse series-parallel combination of resistors and antifuses is employed in such cases. The spike is formed on and slightly below the silicon surface, just below the passivation layer without damaging it. 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. Zener diodes can be used as antifuses. The resulting resistance of the junction is in the range of 10 ohms.

Whereas a fuse starts with a low resistance and is designed to permanently break an electrically conductive path typically when antivuse 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 fpgx the voltage across the antifuse exceeds a certain level. The terminals of the antifuses are usually accessible as bonding pads and the trimming process is performed before wire-bonding and encapsulating the chip.

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They may be less susceptible to alpha particles which can cause circuits to malfunction.

Unsourced material may be challenged and removed. Occasionally, the insulation fails to break down on its own, but tapping the blown lamp will usually finish the job. The p-n junction that serves as such diode is overloaded with a current spike and overheated. 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.

A specialized structure optimized for the purpose can be employed where the antifuse is fpg integral part of the design. This technology has many applications. QuickLogic Corporation refers to their antifuses as “ViaLinks” because blown fuses create a connection between two crossing layers of wiring on the antifuxe in the same way that a via on a printed circuit board creates a connection between copper layers.

Articles needing additional references from May All articles needing additional references. Their disadvantage, however, is lower area efficiency compared to other types. 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. 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 antfiuse.

The antifuse is usually triggered using an approximately 5 mA current. Dielectric antifuses employ a very thin oxide barrier between a pair of conductors.