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3: emitter, base, collector
There are three regions but to be absolutely picky I think only two of them need be doped.
Nope: they MUST be doped NPN or PNP. If any are undoped it will not function as a transistor.
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoemitter
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What is the application of TTL in integrated circuits?
Transistor transistor logic is one type of many different types of bipolar transistor based digital logic circuitry. It is very efficiently implemented in integrated circuit chips, needs only one power supply voltage, and operates at reasonably high speeds. Transistor transistor logic was first developed in the middle 1960s as a modification of the diode transistor logic, then in use in some digital logic integrated circuit chips but dating back to the earliest discrete bipolar transistor logic developed in the late 1950s and derived from vacuum tube point contact diode logic used in many early first generation computers. Transistor transistor logic integrated circuits dominated the computer and electronic digital controller market from the late 1960s until the middle 1980s, when metal oxide semiconductor field effect transistor based microprocessors and microcontrollers began to replace it. By the early 1990s transistor transistor logic and other bipolar transistor based digital logic integrated circuits had been replaced with equivalent complementary metal oxide semiconductor field effect transistor integrated circuits that were both faster and consumed less power (thus running much cooler) or with programmable logic devices of various types. In general transistor transistor logic is now considered obsolete.
How many junction transistor have?
3
How many transistor are used in op-amp 741?
2o
How many pn junction does transistor contain?
Two, either in NPN or PNP transistors
How many possible states does a transistor have?
The transistor is a semi conductor. The materials in which it is constructed has three terminals and which to connect to external input. The connection in addition has another terminal which changes current. Therefore the output is high input is lower.
What is the application of TTL in integrated circuits?
Transistor transistor logic is one type of many different types of bipolar transistor based digital logic circuitry. It is very efficiently implemented in integrated circuit chips, needs only one power supply voltage, and operates at reasonably high speeds. Transistor transistor logic was first developed in the middle 1960s as a modification of the diode transistor logic, then in use in some digital logic integrated circuit chips but dating back to the earliest discrete bipolar transistor logic developed in the late 1950s and derived from vacuum tube point contact diode logic used in many early first generation computers. Transistor transistor logic integrated circuits dominated the computer and electronic digital controller market from the late 1960s until the middle 1980s, when metal oxide semiconductor field effect transistor based microprocessors and microcontrollers began to replace it. By the early 1990s transistor transistor logic and other bipolar transistor based digital logic integrated circuits had been replaced with equivalent complementary metal oxide semiconductor field effect transistor integrated circuits that were both faster and consumed less power (thus running much cooler) or with programmable logic devices of various types. In general transistor transistor logic is now considered obsolete.
What is the relation between transistor current?
transistor current is dependent on a factor known as Beta of the transistor. a darlington pair has a large Beta(10,000) , a small signal transistor such as the 2n3904 has a small beta of around 100. the beta of a transistor determines the amount of current that flows from collector to emitter ( bipolar transistors) for each amount of current that flows into the base you get a hundred fold increase between collector and emitter (2n3904), so you insert 1 ma (milliamp) into the base, you get 100 ma out the emitter. there is a doped region in the middle of the transistor that expands when current is applied to the base, this expansion allows more current to flow from collector to emitter (npn). there are many types of transistors but they all employ basically the same function. The mathematics involved is a bit more complicated but I speaking in general terms here to avoid getting someone lost.
Why is npn transistor called emmitor follower?
In an NPN transistor an emiter follower refers to an amplifier topology. The emiter follower configuration is when the emitter of a N-Type Bipolar Junction Transistor (BJT) is connected to the common point on a circuit (typically ground). This is not always the case, however, because many amplifier configuration exist.
What are the two classifications of transistors?
The two basic types of transistors are the NPN transistorand the PNP transistor. Certainly there are many other semiconductor devices, but these are arguably the two basic ones.
Type of transistor?
There are many different part-numbers found on transistors. These part numbers are to distinuguish individual models for voltage-ratings etc., but there are only two different transistor types; PNP (Positive Negative Posistive), and NPN (Negative Positive Negative)
Why you prefer silicon over conductor?
We use chips of silicon in computers and mobile phones and many other devices because we can control the conductivity of silicon. We cannot control the conductivity of metal conductors -- they are always highly conductive. The really magical thing about silicon is that it can be doped such that a few regions (the "transistor channels") can be actively switched from conductive to insulating, millions of times per second. I wouldn't say I prefer one over the other, though -- all those devices invariably *also* have many metal conductors.
How many kinds of transistor?
germanium - bipolar/darlington?/npn/pnp =4 silicon - bipolar/darlington/thickfilm/thinfilm/npn/pnp =8 J-FET/enhancement/depletion/nchannel/pchannel = 4 MOSFET/enhancement/depletion/nchannel/pchannel = 4 I know of 20 kinds without considering application packaging & frequency (speed).
How many junction that transistor have?
3
How many junction transistor have?
3
What is transistor and how can it operate and what are its types?
A transistor is a semiconductor device used to amplify & switch electronic signals. The name transistor comes from the 'trans' of transmitter and 'sister' of resistor. Transistors are used in a wide array of electronic equipment, ranging from pocket calculators and radios to industrial robots and communications satellites.There are two types of transistor viz:Primary type transistor-The primary type of transistor in use is known as a bipolar junction transistor, which consists of three layers of semi-conductor material, two of which have extra electrons, and one which has gaps in it. The two with extra electrons (N-Type) sandwich the one with gaps (P-Type). These bipolar transistor are divided into NPN and PNP types. All these primary type of transistor are shielded to protect from light source if it is not shielded from light then the light may be used to open or close the gate, in which case it is referred to as a phototransistor, functioning as a highly-sensitive photodiode.Secondary type transistor-The secondary type of transistor is known as a field-effect transistor, and consists either entire of N-Type semi-conductive material or P-Type semi-conductive material, with the current controlled by the amount of voltage applied to the transistor.General process of Transistor WorkingEach transistor has a store of electrical charge that remains there until it is turned on. In order to turn on a transistor, a small electrical charge needs to enter it via the base. When this happens, the electrical charge opens up the collector, and a more powerful charge leaves through the emitter. Electrical charge is measured in milliamps, and the typical transistor will multiply an electrical charge by one hundred times the number of milliamps it has. The electrical charge that is emitted by a transistor will then flow through a route designated by however the component it is attached to is designed. Complex electronics have many paths that electrical currents need to travel on, and therefore many transistors will be needed in order to constantly supply enough power to work the device.
Where was the transistor discovered?
The transistor was not discovered, it was invented.The first patent for a transistor was filed in Canadaon October 22, 1925. The device was a FET and although some prototypes apparently worked the device was never commercialized and sold.The first practical transistor was invented on November 17, 1947 at Bell Labs while attempting to recreate the FET. However this device was a bipolar point contact transistor instead. Early in 1948 another researcher at Bell Labs invented the BJT. Both point contact and BJT types of transistors were rapidly commercialized by Bell Labs and sold by many companies.The first practical FET was invented in 1953 at Bell Labs.
Can someone with bipolar have OCD and depression without being diagnosed with bipolar?
yes it is possible. Bipolar is very difficult to diagnose, especially in teens. Bipolar has similar aspects as ocd. infact Bipolar has many other traits similar to many,many other disorders, that's why it is so hard to diagnose. But yes it is possible. hope this helps
