Explain about transistor amplifiers, Electrical Engineering

Assignment Help:

Q. Explain about Transistor Amplifiers?

Amplifiers are circuits that produce an output signal which is larger than, but proportional to, an input signal. The input and output signals can be both voltages or currents, or one or the other, as in voltage-in current-out and current-in voltage-out amplifiers. The amplifier gain is just the network's transfer function, which is the ratio of output-to-input complex signals in the frequency domain as found by complex analysis.

Amplifiers find extensive use in instrumentation applications. Sometimes, amplifiers are used for reasons other than gain alone. An amplifier may be designed to have high input impedance so that it does not affect the output of a sensor while at the same time giving a low output impedance so that it can drive large currents into its load, such as a lamp or heating element. In some other applications, an amplifier with a low input impedance might be desirable.

The first step in designing or analyzing any amplifier is to consider the biasing. The biasing network consists of the power supply and the passive circuit elements surrounding the transistor that provide the correct dc levels at the terminals. This is known as setting the Q point (quiescent or operating point) with no signal applied. A good bias circuit must not only establish the correct dc levels, but must maintain them in spite of changes in temperature, variations in transistor characteristics, or any other sources of variation.


Related Discussions:- Explain about transistor amplifiers

Find the current and voltage drop at resistor, For the circuit in figure, f...

For the circuit in figure, find the current and voltage drop at every resistor

Power and power distribution, design a single phase circuit from a supply p...

design a single phase circuit from a supply point to a load

Explain n-type and p-type semiconductors, Explain n-type and p-type semicon...

Explain n-type and p-type semiconductors. n - Type semiconductor: If small amount of pentavalent impurity (group V elements) is added to a pure semiconductor giving a large

Image retreval and face recognization technique, block diagram of eigen fac...

block diagram of eigen face,Viola & Jones Method,Bio-ID,RWTH-i6 Groups of People Database

Compute the efficiency of the transformer, Q. These data were obtained from...

Q. These data were obtained from tests carried out on a 10-kVA, 2300:230-V, 60-Hz distribution transformer: • Open-circuit test, with low-voltage winding excited: applied voltag

What is key bouncing, What is Key bouncing? Mechanical switches are us...

What is Key bouncing? Mechanical switches are used as keys in lots of the keyboards. When a key is pressed the contact bounce back and forth and settle down only after a littl

Adc instruction, ADC   Instruction This instruction is used to add th...

ADC   Instruction This instruction is used to add the contents of any register of any register  memory location and carry  flag with the  contents of accumulator  and result  i

Magnetic circuits, Suppose we have a coil wound onto a ring of material wit...

Suppose we have a coil wound onto a ring of material with relative permeability µ r . Provided that the relative permeability µ r  >> 1, then the magnetic flux lines will s

State about the embedded web technology, State about the Embedded Web Techn...

State about the Embedded Web Technology Embedded Web Technology (EWT) This is a new technology which uses the Internet in real time to interact/control with a device which

Electonic principles, can you help with my electronic principle assignment

can you help with my electronic principle assignment

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd