0
What are the frequency limitations for transistor FET's and BJT's?
Wiki User
∙ 13y ago
As with any solid state device the ratings vary greatly depending on the manufacture. For exact statistic consult the component manufacturer.
For FET:
A gate length of 1µm limits the upper frequency to about 5 GHz, 0.2µm to about 30 GHz.
For BJT:
??? could not find a general limit
Wiki User
∙ 13y ago
Wiki User
∙ 13y agovivek
Add your answer:
Earn +20 pts
What does a transistor do?
Depending on how the transistor is biased and various other circuits connected to it, a transistor acts as an amplifier and/or switch. When acting as an amplifier the circuit containing the transistor can do things like transmit or receive radio signals, perform analog mathematical calculations, generate waveforms, etc. When acting as a switch the circuit containing the transistor can do things like turn on/off a light, turn on/off a motor, perform digital logic or mathematical operations, fetch and decode computer instructions, etc. Exactly what a transistor can do is really only limited by the system requirements and the designer's imagination as to how to meet those requirements. There are several different types of transistors: bipolar junction transistors (BJTs), field effect transistors (FETs), unijunction transistors (UJTs), programmable unijunction transistors (PUJTs), spacitors, surface barrier transistors (SBTs), tetrode transistors (TTs), point contact transistors (PCTs), etc.
What are the main differences between FETs and BJTs in terms of voltage gain?
Bipolar Junction Transistorscurrent controlleduse both holes and electrons as carriershave three terminals called the emitter, base, and collectoronly available in one mode of operationField-Effect Transistorsvoltage controlled (like vacuum tubes)use either holes or electrons as carriers, not bothhave three or four terminals called the source, gate, drain and sometimes substrateavailable in either enhancement mode or depletion mode of operation
How many junctions does a Field Effect transistor have?
1
Difference between de mosfet and e mosfet?
The basic difference is between JFET and enhanced MOSFET,although the construction of JFET and depletion MOSFET is different but their most of the characteridtics are same,i.e shockly equation can be applied on both of them,but in JFET we cant give to gate voltage, the +ve value,because it does not works, but in depletion we can give,but some limited +ve value. Now enhanced MOSFET is different,shockly equation cant be applied.The transfer characteristics are purely in +ve Vg region. i.e for E-MOSFET Vg should be > 0,for its proper function.
Why FET called current controlled device?
BJT is a current controlled device because its output current is dependent upon the current in the base while for FET it is controlled by the voltage at the gate terminal of the transistor. BJT is a current controlled device because its base current is not zero while for a FET the gate current is zero
Difeerence between n-channel and p-channel fet?
The field-effect transistor (FET) is a transistor that relies on an electric field to control the shape and hence the conductivity of a channel of one type of charge carrier in a semiconductor material. FETs are sometimes called unipolar transistors to contrast their single-carrier-type operation with the dual-carrier-type operation of bipolar (junction) transistors (BJT). The concept of the FET predates the BJT, though it was not physically implemented until after BJTs due to the limitations of semiconductor materials and the relative ease of manufacturing BJTs compared to FETs at the time.
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 are the main differences between FETs and BJTs in terms of input impedance?
FET has very high input impedanceBJT has very low input impedance
What are FETs?
Field Effect Transistor A: basically a silicon bar where the conduction is controlled by a field since there is no connection to the gate the impedance is very high
How do you calculate the current gain of a transistor JFET?
FETs don't have current gain as no current flows through the gate. The gain of a FET is a voltage gain and is called mu.
Is it possible idenfiying bjt and fet on the circuit?
Identifying BJTs and FETs on the circuitIt is in fact possible to identify transistors in circuits. However, this depends on one's familiarity with the different types of BJT and FET constructions. Since the transistor is a three-terminal device, it is easy to differentiate it from other circuit elements such as resistors, capacitors and inductorswhich are all two-terminal devices. The only exceptions to this may include regulators; which though are not transistors are provided with three terminals.
What does transistor do?
Depending on how the transistor is biased and various other circuits connected to it, a transistor acts as an amplifier and/or switch. When acting as an amplifier the circuit containing the transistor can do things like transmit or receive radio signals, perform analog mathematical calculations, generate waveforms, etc. When acting as a switch the circuit containing the transistor can do things like turn on/off a light, turn on/off a motor, perform digital logic or mathematical operations, fetch and decode computer instructions, etc. Exactly what a transistor can do is really only limited by the system requirements and the designer's imagination as to how to meet those requirements. There are several different types of transistors: bipolar junction transistors (BJTs), field effect transistors (FETs), unijunction transistors (UJTs), programmable unijunction transistors (PUJTs), spacitors, surface barrier transistors (SBTs), tetrode transistors (TTs), point contact transistors (PCTs), etc.
What does a transistor?
Depending on how the transistor is biased and various other circuits connected to it, a transistor acts as an amplifier and/or switch. When acting as an amplifier the circuit containing the transistor can do things like transmit or receive radio signals, perform analog mathematical calculations, generate waveforms, etc. When acting as a switch the circuit containing the transistor can do things like turn on/off a light, turn on/off a motor, perform digital logic or mathematical operations, fetch and decode computer instructions, etc. Exactly what a transistor can do is really only limited by the system requirements and the designer's imagination as to how to meet those requirements. There are several different types of transistors: bipolar junction transistors (BJTs), field effect transistors (FETs), unijunction transistors (UJTs), programmable unijunction transistors (PUJTs), spacitors, surface barrier transistors (SBTs), tetrode transistors (TTs), point contact transistors (PCTs), etc.
What does transistor?
Depending on how the transistor is biased and various other circuits connected to it, a transistor acts as an amplifier and/or switch. When acting as an amplifier the circuit containing the transistor can do things like transmit or receive radio signals, perform analog mathematical calculations, generate waveforms, etc. When acting as a switch the circuit containing the transistor can do things like turn on/off a light, turn on/off a motor, perform digital logic or mathematical operations, fetch and decode computer instructions, etc. Exactly what a transistor can do is really only limited by the system requirements and the designer's imagination as to how to meet those requirements. There are several different types of transistors: bipolar junction transistors (BJTs), field effect transistors (FETs), unijunction transistors (UJTs), programmable unijunction transistors (PUJTs), spacitors, surface barrier transistors (SBTs), tetrode transistors (TTs), point contact transistors (PCTs), etc.
Identification of transistors pins?
Identify Transistor Pin-outsWhich Pin Is Which on a BJT?Use this chart to find which pin is the base on a bipolar transistor and at the same time get a good idea of whether the transistor is faulty or good.(Don´t test FETs in this way though - handling FET pins can destroy the transistor!).Follow tests 1 - 3 then decide from the result which of the four arrows to follow. You may have to go through the test sequence more than once to make your diagnosis.
How do you check field-effect transistor using analoge multitester?
There is no simple way to test FETs with either analog or digital multimeters. Bipolar transistors can be tested to see if their junctions are OK but they can also have failures that cannot be detected with a multimeter.
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.
