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Transistors are commonly used as electronic switches, for both high power applications including switched-mode power supplies and low power applications such as logic gates.
When the transistor reaches a base voltage of a certain level the current will no longer increase and the output will be held at a fixed voltage. Because of this property the transistor can have values of input voltage such that the output is either completely off or completely on. The transistor is acting as a switch, and this type of operation is common in digital circuits where only "on" and "off" values are relevant.
FOR A TRANSISTOR TO BE CALLED A SWITCH it must be operating into the saturation area. whereby both diodes are fully forward biased. to saturate a transistor Essex current must flow into the base. how much rules of thumbs beta of 10. Pushing more base current will have the effect of increasing saturation voltage meaning there is a trade off. it is incorrect to assume that the voltage will no longer increase I submit that both diodes will follow an exponential curve.
Basically: BY CREATING TWO CIRCUIT LOOPS
Wiki User
∙ 11y ago
Wiki User
∙ 12y agoFor BJTs, if you connect the the collector to the base. If you look at the Ebers-Moll model for a BJT, this will become abundantly clear:
http://web.cecs.pdx.edu/~jmorris/ece321/ECE321%20Winter%202008/J%20&%20B%20Added%20Textbook%20Material/Section%205.5%20Insert%20p217-220.pdf
Wiki User
∙ 14y agoFrom wikipedia.com:
A transistor is a semiconductor device used to amplify or switch electronic signals. It is made of a solid piece of semiconductor material, with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor's terminals changes the current flowing through another pair of terminals. Because the controlled (output) power can be much more than the controlling (input) power, the transistor provides amplification of a signal. Some transistors are packaged individually but many more are found embedded in integrated circuits.
Wiki User
∙ 14y agoA single transistor has three basic components: An Emitter, A Base and a Collector.
There are two types of transistors: One is a NPN and the other a PNP.
Let's look at the NPN first. Think of the emitter as a ground bar or a common work point.
We will call this section ground, or our grounded element, just so we know what our reference is. Any voltage we talk about are referenced to this point
The next section is called the base. We are going to apply small signal voltages here. By applying a small voltage here we are causing large changes in the internal resistance inside the transistor. This signal voltage must always be positive compared to ground (emitter)
The third section is our collector. This is the output of our transistor. The small voltage swings at the base cause large swings in resistance between the emitter and this section. If we put a load here and a voltage source across the load and in series with this device, we see amplification.
If we tie the base to the collector, this becomes a memory device. Once the base sees a small voltage the transistor turns on and stays on until the power to the device is lost.
A PNP works the same way but the positive side is the emitter and all voltages that are referenced to the emitter must be negative to the emitter.
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Does a refrigerator have transistors?
A fridge may or may not have a few transistors in it, these are electrical components that would probably be part of the control circuitry. Transistors used to be very common components of most electrical appliances. The cooling process of the fridge has nothing to do with transistors and is handled by a compressor and a heat exchange pump
How many transistors are in an AND gate?
6
How many transistors are used in static ram?
I am not to sure about Static Ram but in CMOS RAM, 1GB of RAM would contain about 137438953472 transistors because 1 bit of CMOS RAM contains 16 Transistors, 8 bits in a byte and 1073741824 bytes in a gigabyte. I am 100% sure about this and these are just estimations. Static RAM uses about 6 times as many transistors as dynamic RAM for the same amount of storage. Dynamic RAM uses 1 or 2 transistors per bit in typical implementations. Add to this transistors for address decode, bus interface, etc.
What were used before transistors?
If the integrated circuit in some kind of device has 5,000 transistors on it, then before integrated circuits were available, the same function might have been performed by 100 individual transistors. And before transistors were available, the same function might have been performed by 30 vacuum tubes, a fan and air system to keep them cool, and a large power system to operate the tubes and the cooler.
How many transistors in LCD?
millions and more
What are power transistors?
Power transistors are transistors that are used in high-power amplifiers and power supplies.
Are transistors semiconductors?
Transistors are made out of semiconductors, yes.
What element are in transistors?
Silicon and germanium are the elements used in transistors
What elements in in transistors?
Silicon and germanium are the elements used in transistors
Why are npn transistors used more often than pnp transistors?
The primary reason that NPN transistors are used more often than PNP transistors is that they usually operate faster (at higher frequencies) because the mobility of the current carriers in NPN transistors (electrons) is much higher than that of the current carriers in PNP transistors (holes).
What elements are used in transistors?
Silicon and germanium are the elements used in transistors
How did colossus work without transistors?
There were vacuum tubes before transistors
How many transistors are on a Phenom II 965?
758 Million transistors.
How do you install transistors on Toyota 5fbc25?
how to install TMS003 transistors on Toyota 5fbxc25
Do phones have transistors?
yes, Mobile phones are having transistors.
What replaced vacuum tubes in the computer?
Integrated circuits (in many microprocessor integrated circuits) containing many billions of transistors each.
Why transistors are called transistors?
Previous answer "TRANSISTORS are current controlled voltage soruce" Nup, current-controlled current controller. Named as a contraction of TRANSference resISTOR.
