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.
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. Views Read Edit View history. When the failed lamp was finally changed, a new piece of film was also installed, once again separating the electrical contacts in the cutout. A standard NPN transistor structure is often used in common bipolar processes as the antifuse.
They are historically antkfuse especially with bipolar processes, where the thin oxide needed for dielectric antifuses is not available.
They may be less susceptible to alpha particles which can cause circuits to pfga. 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.
Antifuses are best known for their use in mini-light or miniature style low-voltage Christmas tree lights.
Ordinarily for operation from mains voltagesthe lamps are wired in series. 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.
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. Formation of the conductive channel is performed by a dielectric breakdown forced by a high voltage pulse.
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. An antifuse is an electrical device that performs the opposite function to a fuse.
Zener zap is frequently employed in mixed-signal circuits for trimming values of analog components. 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. 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.
This technology has many applications. Each bit contains both a fuse and an antifuse and is programmed by triggering one of the two.
By this approach, it is possible only to lower the value of the resulting resistor. Unsourced material may be challenged and removed. Unlike Christmas lights, the circuit usually contained an automatic device fpa regulate the electric current flowing in the circuit, preventing the current from rising as additional lamps burned out. 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.
antifuse Definition from PC Magazine Encyclopedia
Retrieved from ” https: Their disadvantage, however, is lower area efficiency compared to other types. May Learn antjfuse and when to remove this template message. 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.
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.
Antifuses are widely used to permanently program integrated circuits ICs. This page was last edited on 7 Julyat 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 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 ajtifuse, causing it to rupture.
Zener diodes can be used as fpva. 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. This article needs additional citations for verification.