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

Write some disadvantages of loosely coupled systems, Write some disadvantag...

Write some disadvantages of loosely coupled systems More complicated due to the needed additional communication hardware. They are less portable and more expensive because o

Determine the current through each resistor, For the circuit of Fig 1a: ...

For the circuit of Fig 1a: (i) Using Ohm's Law , determine the equivalent resistance across the battery (ii)  determine the current through each resistor (iii) the arrang

Quick ratio, Quick ratio A stringent indicator that determines whether...

Quick ratio A stringent indicator that determines whether a firm has enough short-term assets to cover its immediate liabilities without selling inventory. It is calculated as

Downsampling in dsp, #ques1. (MATLAB) Generate 100 samples of the signal ...

#ques1. (MATLAB) Generate 100 samples of the signal  = sin (0.125). We want to decimate this signal using D = 2. • Design a 25-order lowpass filter using the Parks-McClella

Explain magnetic property of ferromagnetic materials, The critical temperat...

The critical temperature above which the ferromagnetic materials lose their magnetic property is known as (A) Hysteresis.                                   (B) Curie point.

Explain the working of a depletion type mosfet, Q. With a cross sectional v...

Q. With a cross sectional view, explain the working of a depletion type MOSFET Draw a biasing amplifier circuit DEPLETION-TYPE MOSFET: Two types of FETs: JFETs and MOSFETs. MOS

Illustrates typical thermal noise waveform, Q. Illustrates typical thermal ...

Q. Illustrates typical thermal noise waveform? In general, any physical resistor or lossy device can be modeled by a noise source in series with a noiseless resistor, as shown

Explain public mode, Explain PUBLIC For large programs several small mo...

Explain PUBLIC For large programs several small modules are linked together. In order that the modules link together correctly any variable name or label referred to in other m

Describe the physical properties and uses of the brasses, Describe the phys...

Describe the physical properties and uses of the Brasses. Brass - It is an alloy of copper and zinc along with 60 percent copper and 40 percent zinc. Its properties are- 1.

Break over voltage of finger voltage - thyristor , Break over  voltage of...

Break over  voltage of Finger Voltage   The  minimum  forward voltage  when the gate  is opened  at which SCR  starts  conducting  heavily is called  the break over  voltage. To

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