A resettable fuse is a polymeric positive temperature coefficient (PPTC) device that is a passive electronic component used to protect against overcurrent faults in electronic circuits. The device is also known as a multifuse or polyfuse or polyswitch. . Beam deflection tube · Charactron · Iconoscope · Magic eye tube. Read about ‘F1/F2 polyfuses gone’ on elementcom. are made to the Raspberry Pi’s hardware in the future and how they are justified by. Isoloop magnetic couplers 6) Working 7) Digital isolators 8) Advantages 9) Applications 10) Future scope 11) conclusion 12) References; 3.

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Wednesday 04th of October Lay out a series-connected binary-weighted resistor network consisting of four resistors, the smallest futufe which equals Assume all of these resistors consist of PSD-doped poly-2 with a width of 4um.

Considerable space can be saved by eliminating the base diffusion Figure 5. They are less variable than base pinch resistors,and they have a much larger sheet resistance than base.

Pinch resistors can withstand larger differential voltages if they are constructed in multiple segments. A speed sensor is positioned around the axis, thus detecting the wheel revolutions.

A base pinch plate can be made still more effective by coding base implant alone rather than in conjunction with moat.

Their sheet resistances typically range from 2 to so there is no difficulty in directly contacting the emitter diffusion. The sheet resistance of base pinch resistors is poorly controlled and a process variation of 50 is typical. Diffused resistors can also withstand larger power transients than poly resistors because the thermal conductivity of silicon far exceeds that of the field oxide. This section compares the various polyyfuse of resistors presented in Chapter 3, and also presents several additional resistors that are useful for special applications.


future scope of polyfuse pdf

By itself, the N-well exhibits a sheet Even higher sheet resistances can be produced by resistance of as much as pinching the well with PSD Figure 5.

The networks used for laser trimming are similar to those shown in Figure 5. At higher voltages, the positive end of the resistor can deplete entirely through.

Nonuniform current flow near the contacts can increase its resistance.

Resettable fuse

Unless the circuitry is specifically designed to switch at low voltages, the look-ahead process may overstress the poly fuse, causing it to increase in value to the point where it can no longer be reliably programmed. In extreme cases, polysilicon resistors may experience a phenomenon similar to what occurs in Zener zaps.

To get full information or details of money pad the future wallet ppt free download please have a look on the pages http: The act of programming a Zener is called zapping, so these Zeners are called zap Zeners, or Zener zaps. About future of polyfuse pdf download is Not Asked Yet? As the voltage difference between the resistor and the tank increases, the depletion regions widen and the resistance increases.

Outdiffusion can widen a resistor and thus reduce its resistance.

The current must bend upward to exit through the surface of the resistor, and it crowds toward the inside edges of the contacts as it does so. The heterogeneous nature of polysilicon also affects its temperature coefficient of resistivity.


5The art of Analog Layout(Resistors)_图文_百度文库

The three tank biasing schemes shown in Figure 5. By the same token, narrow resistors will exhibit large process variations due to linewidth control. Archived from the original PDF on 22 January Emitter Resistors Emitter resistors are available in standard bipolar Figure 3.

Lasers are also used to sever metal and ot links. Diffused resistors do, however.

So we will move to find the exact location of fault. These sense leads should be as narrow as possible to ensure that the length of the resistor is determined by the spacing between the leads and not by their width. The width bias applies to the HSR implant forming the resistor body, while the length bias applies to the separation between the base heads. Second-metal leads can route over a resistor placed on first metal, but first-metal or poly leads should not route beneath a resistor placed on second metal because they may introduce nonplanarities in the resistor.

These specialized materials can also be deposited as h i n -f i l m resistors easthin films on the surface of an integrated circuit. The most significant corrections to the resistor equation are those scooe with width rather than length, because most resistors are much narrower than they are long.