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

Name the materials used in case of bimetals, Name the materials used in cas...

Name the materials used in case of Bimetals and give reasons. Bimetals : Alloy of nickel and iron along with low value of coefficient of thermal expansion are utilized as

When mt2 is negative and g is positive , When MT 2 is Negative  and g is ...

When MT 2 is Negative  and g is positive In this  case  gate  current  flows  through  junctions P 2 N 2   electrons  are injected from  N 2   layer to  P 2   a result  junct

Explain the properties of high resistive materials, Explain the properties ...

Explain the properties of high resistivity materials. High resistivity materials: The conducting materials containing resistivity from 10 -6 to 10 -3 ohm-m come under such

Explain open loop control systems, Explain Open Loop Control Systems In...

Explain Open Loop Control Systems In an open-loop control system, the controller independently computes exact voltage or current required by the actuator to do the job and send

Explain the excess three codes - bcd to decimal conversion, Explain the Exc...

Explain the Excess three codes - BCD to Decimal Conversion The Excess-3 representation of a number is based on Binary Coded Decimal. It is formed by taking the number in Binary

Temperature triggering , Temperature Triggering At high temperature th...

Temperature Triggering At high temperature the leakage current  of junction J 2 increases. This leakage  current is collector  current of tr 1 and Tr 2 . So rise in temperat

#emf., what is the effect of back emf ?

what is the effect of back emf ?

Determine the resonant frequency and bandwidth, Q. A gyrator is sometimes u...

Q. A gyrator is sometimes used in integrated circuits to simulate inductances. Consider the circuit of Figure consisting of a gyrator. (a) Show that the impedance as seen to the

Conditional jumps , Conditional Jumps The most  important  part of  pr...

Conditional Jumps The most  important  part of  programming is its  decision making capability. Which is  normally  provided  by statements  like if  then else in high level

Determine the study of robotics, Determine the study of Robotics Robots...

Determine the study of Robotics Robots can comprise embedded processors or be linked to a computer system. They are pre-programmed to do a specific task or taught' to remember

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