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Bipolar is still much faster and still can drive more devices than cmos. Military continues to use it along with companies like IBM. I think the PS3 uses those processors; the powerpc processors from IBM. The first 3 Pentium chips were BiCMOS in fact. It will always be needed
Bipolar transistors a thing of the past? Absolutely not! They're everywhere! It's just that a large majority of them are integrated into 1-piece circuits, the so-called integrated circuits. Many, many transistor junctions can be printed on a substrate (along with many other components), and we can end up with some very exotic circuits on a single chip. Just because you can't see 'em doesn't mean they ain't there. Your automobile almost certainly has a number of integrated circuits in it, and most if not all of them have bipolar junction semiconductor devices printed into the circuit. Count on it.
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What does the arrow in bipolar junction transistor symbol represent?
There a two types of bipolar transistors PNP and NPN . This refers to the doping elements used in the silicon components of this 3 layer device with base always in the middle. The arrow is the emitter wire and shows direction of conventional current flow(positive to negative) NPN transistors (generally used in negative earth circuits) have the arrow pointing away from the base connection PNP transistors ( generally used in circuits with positive earth) have the arrow pointing towards the base connection.
Difference between bipolar junction transistor amplifier and field effect transistor amplifier?
Bipolar transistors are so named because in which holes & electrones takes part in conduction.as opposed to unipolar transistors, such as field-effect transistors, in which only one type of Majority carrier takes part in conduction. FET Advantage over BJT FET requires vertually no input corrent and gives extreamly high input resistance.FET's have a 4th source called a body and are a little bit more complicated the simple emitter, base, and collector of BJT's. they are more semiconductor and can't handle as much power as BJT.http://en.wikipedia.org/wiki/Field_effect_transistorhttp://en.wikipedia.org/wiki/Bipolar_junction_transistor
What configuration will give both voltage and current gain simultaneously?
amplifiers operated with Common emmitter configuration for bipolar transistors , will give both voltage & current gain . Though equivalent fet & mosfet circuit topologies exist , these amplifiers operate more on signal voltage on input & the signal current is negligible compared to a bipolar transistor.
Why FET is called as a unipolar transistor?
The FET is a semiconductor device with the output current controlled by an electric field. Since the current is carried predominantly by one type of carriers, the FET is known as a unipolar transistor.
How does a phototransistor work?
All bipolar transistors are light sensitive: photons striking the semiconductor create electron-hole pairs which make the transistor conduct.In ordinary transistors this is an undesirable source of noise, so they are packaged in opaque metal or plastic cases.A phototransistor on the other hand is packaged either in a metal case with a transparent lens or in transparent plastic to let light in.Note: this is not a significant effect with MOS transistors.
What are PNP and NPN?
In most discrete bipolar junction transistors the substrate is the collector. In monolithic integrated circuits the bipolar junction transistors are electrically isolated from the substrate, either by reversed biased junctions or insulator (e.g. sapphire). Some older bipolar junction transistor types (usually made with germanium) the substrate is the base. In bipolar point contact transistors the substrate was the base.
What do digital circuits mostly use?
Bipolar Transistors and Diode's .
What is the center section of a transistor called?
in bipolar transistors it is called the basein field effect transistors it is called the channel
What applications would prefer the bipolar junction transistors over the field effect transistor?
bjt is bipolar device whr fet is unipolar....fet is input resistance thts y fet gain is less compared to bjt..... The applications that will prefer bipolar junction transistors to field effect transistors are applications that require fast switching.
What is btj transistors?
They are NPN and PNP. BJT mean bipolar junction transistors. there are two P-N junctions in BJT transisters.
Why h parameters are used?
They are one standardized way of describing the characteristics of bipolar transistors.
What has the author Peter Ashburn written?
Peter Ashburn has written: 'Sige Heterojunction Bipolar Transistors'
Do people use bipolar junction transistor today?
Yes people still use bipolar junction transistors today because of its high switching speed.
Why Insulated gate bipolar transistors are used for Uninterrupted power supplies?
they are reliable and have high pulse ratings.
Why are MOSFETs used in motor control circuits instead of bipolar junction transistors?
Actually either can be used.
Are the Bipolar Junction Transistor and the Transistor the same thing?
Sort of. The Bipolar Junction Transistor, or BJT, is a type of transistor. But the term transistor applies to a much wider family of components than just the Standard BJT. A rough list of the other common types of transistors includes:Field effect transistors, or FETs, including both Junction types and Metal-oxide Semiconductor types: JFETs and MOSFETs. and also UJTs or unijunction transistors.In a basic electronics course, though, if you say just 'transistors' it is assumed you mean BJTs.
What has the author Richard Charles Jaeger written?
Richard Charles Jaeger has written: 'Low frequency noise sources in bipolar junction transistors' -- subject(s): Transistors, Frequency response (Dynamics)
