What is barkhausen criterion, Electrical Engineering

Assignment Help:

Q. What is Barkhausen criterion? Why is the value of Ab kept slightly greater than 1?

The condition |Ab| = 1 is called the Barkhausen criterion. It implies that when |Ab| = 1, there exists an output voltage even in the absence of any externally applied signal. If |Ab| = 1, the feedback voltage is sufficient for producing self sustained oscillations. If Ab = 1 precisely, then after sometime it is found that Ab will either become lower or higher than unity. This is due to the change in the characteristics of the active devices with voltage, temperature or age. If Ab < 1, the removal of input signal source will result in dying out of oscillations. If Ab > 1, then the amplitude of the oscillations will continue to increase until clipping occurs because of saturation and cut-off causing the voltage gain to reduce.

Hence, Ab is kept slightly larger than unity so that any variation in circuit parameters may not cause Ab to become less than unity.


Related Discussions:- What is barkhausen criterion

Explain the hysteresis loop of a magnetic material, Explain the hysteresis ...

Explain the hysteresis loop of a magnetic material. Hystereses loop-Below the Curie temperature all-ferromagnetic materials show the identified hysteresis in the B (i.e. flux

Explain about hybrid network, Q. Explain about Hybrid network? Hybrid n...

Q. Explain about Hybrid network? Hybrid network (sometimes known as a hybrid coilor duplex coil) in a telephone set is a special balanced transformer used to convert a two-wire

Energy bands, Energy Bands 1) Since isolated atoms are brought togethe...

Energy Bands 1) Since isolated atoms are brought together to make a solid, the electron wave functions begin to overlap. 2) Several interactions occur, and, at the proper i

Describe the function of material handling system, a) Diagram FMS layout co...

a) Diagram FMS layout configurations with labeling. b) what are the basic components of FMS?Discuss in briefly. c) Describe the function of material handling system.

Network topology, LAN topologies: Network topology is a physical schematic...

LAN topologies: Network topology is a physical schematic that demonstrates interconnection of the many users. There are four fundamental topologies as under: (i) Direct Connect

Show that operating point does not depend on beta, Q. Prove mathematically ...

Q. Prove mathematically that the operating point does not depend on beta, in a potential divider bias circuit ? To determine the operating point, consider the input section of

Determine tick of the material, Tick off the material, which is different f...

Tick off the material, which is different from the group (A) Constantan.            (B) Manganin. (C) Nichrome.               (D) Brass. Ans: Tick off the materi

Determine briefly subscriber loop system, Q. Determine briefly subscriber l...

Q. Determine briefly subscriber loop system.  Give some technical specification for subscriber lines. Ans: Subscriber Loop System: Each subscriber in a telephone network is

Electrical engineering, 4. Modify the circuit designed for question 3 to pr...

4. Modify the circuit designed for question 3 to provide an emergency stop which will park both cylinders in the extended position (i.e. A + B +). 5. Modify the circuit designed fo

Which property of material allows it to drawn out in wires, Property of mat...

Property of material which allows it to be drawn out into wires is (A) Ductility.                                    (B) Solder ability. (C) Super conductivity.

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