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

Determine the flux, Q. Consider themagnetic circuit of Figure. Let the cros...

Q. Consider themagnetic circuit of Figure. Let the cross-sectional area AC of the core, be 16 cm 2 , the average length of the magnetic path in the core lC be 40 cm, the number

Explain explanatory notes on a/d conversion, Explain explanatory notes on A...

Explain explanatory notes on A/D conversion. The digital inventory is working a revolution into the field of microcontrollers, technology and microprocessors are used more effi

R = 10 ohms VB = 5V V1 is the sinusoidal wave having, Ask questionDraw the ...

Ask questionDraw the following circuits on the PROTEUS and check the output waveform on oscilloscope #Minimum 100 words accepted#

Circuit board packaging, Topics for the projects 1. Power supply design:...

Topics for the projects 1. Power supply design: One source, multiple source. Project process: 1.  Design(circuit analysis, diagram, list of components). 2.   Hardware e

Design a calculator with multi functions, Aims More practice using d...

Aims More practice using data movement and control flow statements. Understand techniques to interface microprocessors with external switch-based hardware. Write P

Explain working of electrically erasable programmable rom, Q. Working of El...

Q. Working of Electrically erasable programmable rom EEPROM is used for remote-area applications. The device is provided with special pins which, when activated electrically, a

State fleming''s right-hand rule, Fleming's Right-hand rule states: Let ...

Fleming's Right-hand rule states: Let the thumb, first finger and second finger of the right hand be extended such that they are all at right angles to every other. If the first

Explain what is interrupt latency, Interrupt latency refers to the amount o...

Interrupt latency refers to the amount of time among when an interrupt is triggered and when the interrupt is observe by software.

Armature winding, what is use of dummy coil in DC m/c????

what is use of dummy coil in DC m/c????

Explain protected mode addressing, Explain protected mode addressing. ...

Explain protected mode addressing. This addressing permits access to data and programs located as the first 1M byte of memory, with in the first 1M byte of memory. Addressing

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