Electronics Engineering

Different between power transistor and transistor that used in small signal?


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2012-09-07 14:10:33
2012-09-07 14:10:33

Power transistor can conduct large amount of currents through it, more than small signal transistor. power transistor has a vertical structure and small signal transistor has horizontal structure.In power transistor quasi saturation region is present which is absent in the small signal transistor. In power transistor there is a inculsion of drift layer which is not there in the small signal transistor. Power dissipation is less in power transistor and it is more in small signal transistor.


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When the out from a transistor is the exact replic of the input signal then it is called unmodulated signal i e. there will not be any change in frequency voltage power etc

A Mosfet is a (spelled down): Metal Oxide Semiconductor Field Effect Transistor A power transistor could be a power mosfet, but a power mosfet is not the only option for power transistor - you could use a BJT, JFET, etc.

in bc107 transistor b stands for the material i.e,silicon here and c stands for af low power signal

A power transistor is physically larger, and capable of carrying more current without melting or burning up. Usually a power transistor has a heatsink attached to help remove heat from the device and keep it cool.

A BJT is one type of transistor and POWER TRANSISTOR can be BJT or MOSFET or some other phenomena.POWER TRANSISTOR are usually those who are used at high current ratings e.g at POWER AMPLIFIER where large transistors are used at final stage to gain output.

It can be calculated by simplifying the ratio between power of signal by power of noise

A: A transistor is a voltage amplifier and a tube is a current amplifier. A tube needs emission power to function a transistor does not.

Active devices are those devices which can produce power or which can amplify the signal Such devices are- diode transistor op-amp

a transistor designed to operate at high power levels. was that brief enough?

There are three pins on a transistor. One is hooked to the input signal. One to the power supply, and the third to ground. (These have different names depending on whether the particular device in your hand is a bipolar transistor or a field-effect transistor.) The pin hooked to the input signal controls the amount of voltage allowed to pass from the power supply pin to the ground pin. So, basically, to amplify an input signal you feed more power into the "power supply" pin on the transistor than you are feeding into the "input" pin. You don't want a huge amount of difference between the input and output on a transistor because it'll distort if you ask it for much, so a really high-powered transistor amp has multiple stages. That's one large difference between designing a transistor amp and a tube amp: a tube will give you a lot more amplification in one stage before it distorts. Prime example: the Marshall 2203 amplifier head, which is the most popular heavy-metal guitar amp head around. It's a 100-watt amplifier that contains one stage of preamplification with two tubes and one power amplification stage with four tubes. If that was a transistor amp it'd have at least 50 transistors in it. Another example, and a better one at that, is the 4CX35000 radio tube...which will amplify a 1750-watt input to 35,000 watts in one stage. I love solid state devices for their low power consumption, reliability and low heat, but if you're looking for a lot of gain in very few devices, tubes have always been the way to go.

A transistor controls the flow of current between the emitter and collector. The larger current is supplied by the power supply, across the emitter and collector. The flow is then controlled by a small current applied to the base connection. So, a large current flow mimics the small signal current. Limits are reached, when the transistor gets close to being fully switched on or off. This will cause distortion. To avoid this, more amplification is provided by a series of transistor amplifiers, one after the other.

A transistor is a device used to switch power between electrical components. Transistors work to amplify existing signals as well as open and close circuits.

Its is the emiiter base of the transistor voltage!

what is the power rating of a transister

The transistor is the one that controls the collector and emitter of power supply. The flow of power supply is based on voltage.

An AS162 transistor is a type of PNP transistor commonly made of germanium. This is an older kind of transistor that was often found in power amplification circuits.

It is an npn power transistor

Electronic have two type of components Active components and Passive components. Active components are those which increase the power of a signal and must be supplied with the signal and a source of power. Passive components do not increase the power of a signal. Active components are Bipolar transistor, Operational amplifier, field effect transistors etc and Passive components are semiconductor, resistor, capacitor, inductor etc

A signal x(t) is called an energy signal , if the energy is finite and the power is zero.A signal x(t) is called an power signal , if the power is finite and the energy is infinite.

no,ramp signal is neither energy nor power signal... because ramp signal is infinit energy and power

This is a particular transistor amplifier configuration. In general, the input signal is applied to the base, the collector is connected to a supply voltage, and the output is taken between the emitter and power supply common. One of the characteristics of the emitter follower is the output voltage "follows" the input, but the output is reduced by the Vbe voltage (the voltage drop between base and emitter, approximately 0.7 V for a silicon bipolar transistor).

TTL - transistor-transistor logic uses connections between transistors to perform logic functions, rather than connections using resistors or diodes.T - transistor input stage (logic section)T - transistor output stage (power gain section)L - logicEarlier logic families like DTL (D - diode input stage) and RTL (R - resistor input stage) used different components in the input circuit and simpler output circuits.Later logic families like IIL (Integrated Injection Logic) and CMOS (Complimentary Metal Oxide Semiconductor) used entirely different circuits without separating into input (logic) and output (power gain) stages and significantly reduced power consumption, making dramatically higher levels of integration practical.

a 603 12F high current power, multi-emitter transistor.

Passive elements don't require power from the supply to produce its effect on a signal. They derive the power of the input signal to perform its action. for example, a resistor doesn't require a separate supply to provide its action of resistance in a circuit. Where as in active elements there should be a power source for its working. They require a supply for there working. For instance, transistors - Only after biasing the transitor in required region of operation, its characteristics are applied on the signal. ie, for amplification, transistor require a source from where it can work in.

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