What are transistor amplifiers, Electrical Engineering

Assignment Help:

Q. What are transistor amplifiers? What is meant by efficiency of an amplifier? What is amplifier coupling?

The AMPLIFIER is a device that enables an input signal to control an output signal. The output signal will have some (or all) of the characteristics of the input signal but will generally be larger than the input signal in terms of voltage, current, or power. A transistor amplifier is a current-control device. The current in the base of the transistor (which is dependent on the emitter-base bias) controls the current in the collector.

Once current is controlled it can be used to give a voltage gain or a power gain. The efficiency of an amplifier refers to the amount of power delivered to the output compared to the power supplied to the circuit. Since every device takes power to operate, if the amplifier operates for 360° of input signal, it uses more power than if it only operates for 180° of input signal. If the amplifier uses more power, less power is available for the output signal and efficiency is lower. Since class A amplifiers operate (have current flow) for 360° of input signal, they are low in efficiency.


Related Discussions:- What are transistor amplifiers

Voltage divider with ac bypasses capacitor, Voltage divider with AC bypasse...

Voltage divider with AC bypasses capacitor: Figure: Voltage divider with capacitor The standard voltage divider circuit that is discussed above faces a drawback - A

Semiconductor material, Semiconductor Material: Semiconductor is a mat...

Semiconductor Material: Semiconductor is a material that has a conductivity level somewhere between the extreme of an insulator and a conductor   Resistivity of a material

Image gradient, Image gradient Write an m-file "grad.m" which computes ...

Image gradient Write an m-file "grad.m" which computes and displays gradient and orientation of an input image (use Gaussian derivatives). To compute Gaussian derivative in o

Embedded system, comment instruction for LIST p=18f4550

comment instruction for LIST p=18f4550

500Mhz Collpitts Oscillator, How to design an Oscillator Circuit (500 MHz r...

How to design an Oscillator Circuit (500 MHz range) with no Op amps?

Concept of flux density, We can illustrate the direction and strength of a ...

We can illustrate the direction and strength of a magnetic field by means of drawing 'flux lines'. These have arrows to show the direction of the magnetic field at any point and th

The quantity of electricity transferred., If a current of 10A flows for fou...

If a current of 10A flows for four minutes, find the quantity of electricity transferred. Quantity of electricity, Q=It coulombs. I =10A and t = 4 × 60 = 240s.  Hence Q =

Calculate rotor copper losses, A 20 h.p. , 3 phase, 400 volt, 60 hertz, 4 p...

A 20 h.p. , 3 phase, 400 volt, 60 hertz, 4 pole induction motor delivers full load at 5% slip. The mechanical rotational losses are 400W. Calculate (a) The electromagnetic torqu

Define super scalar architecture, Define super scalar architecture. Su...

Define super scalar architecture. Super scalar architecture: The Pentium microprocessor is organized along with three execution units. Individual executes floating-point inst

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