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

What is a co-processor, What is a co-processor? 8087 NDP (numerical da...

What is a co-processor? 8087 NDP (numerical data processor) is also termed as math co-processor that is used in parallel with the major processor for number crunching applicat

Piezo crystal osillator, whether piezo crystal and quazt crystal oscillator...

whether piezo crystal and quazt crystal oscillator are same?

Briefly explain the principle and operation of strain gauges, Question: ...

Question: (a) With the help of a clearly labeled diagram explain the functioning of a basic thermocouple. (b) Briefly explain the principle and operation of strain gauges

permanent magnet stepper motor - stepper motor , Normal 0 fa...

Normal 0 false false false EN-IN X-NONE X-NONE   Permanent   Magnet Stepper Motor The s

Determine the load - thevenins equivalent circuit, Determine the load - The...

Determine the load - Thevenins Equivalent Circuit: Determine the load for which the source shall transfer the maximum power if load is connected across the terminal A and B, u

What do you mean by companding, Q. What do you mean by Companding? In o...

Q. What do you mean by Companding? In order to lower the crest factor of a waveform, so as to produce better performance, a process known as companding is used. It works like a

What is idss, Q. What is Idss. What are the conditions for its maximum valu...

Q. What is Idss. What are the conditions for its maximum value? The term 'Idss' refers to saturation condition of the Drain current. From the above graph it's clear that as the

Rise time - power semiconductor devices , Rise  Time (t r ) During  ri...

Rise  Time (t r ) During  rise time voltage falls from 90% V a to 10%  where  V a where V a is the initial  anode  voltage. In terms  of current  time taken  by anode  curre

What is the minimum sampling rate, Q. The magnitude spectrum of a continuou...

Q. The magnitude spectrum of a continuous  image is as given below.  a) Sketch the frequency response of the sampled spectrum if   ωs =1.5 ωm along x and 3ωm along  y directions

Define electrical power, Electrical power Power P in an electrical circ...

Electrical power Power P in an electrical circuit is given by the product of potential difference V and current I. The unit of power is the watt, W.

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