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

Programming languages - introduction to microprocessors , Programming langu...

Programming languages As we  have seen  the evolution of computer  hardware  similarly  programming  languages also  have their  history  of development from  machine  language

Schematic diagram of a system in which the d/a converter, Q. Develop a sche...

Q. Develop a schematic diagram of a system in which the D/A converter of Figure can be employed in a digital voltmeter.

RLC series, What is Average value in AC circuit?

What is Average value in AC circuit?

Low voltage at transformers, Low Voltage at Transformers While the vo...

Low Voltage at Transformers While the voltage applied to induction motor varies from the rated voltage, its performance is affected. Against permissible voltage variation of

Define serial in - serial out shift registers, Define Serial In - Serial Ou...

Define Serial In - Serial Out Shift Registers? An essential four-bit shift register can be constructed using four D flip-flops. The register is the first cleared forcing all fo

Explain industry standard architecture bus, Explain the term Industry Stand...

Explain the term Industry Standard Architecture Bus. The Industry Standard Architecture, bus has been approximately since the very start of the IBM-compatible personal computer

What do you mean by heat sink?, Q. What is a heat sink? List the factors, w...

Q. What is a heat sink? List the factors, which determine its efficiency. To reduce the chance of thermal runaway, the rise of temperature at the collector junction to a danger

Explain lda and daa instructions, Explain LDA, STA and DAA instructions ...

Explain LDA, STA and DAA instructions LDA copies the data byte into accumulator from the memory location particular by the 16-bit address. STA copies the data byte from the acc

Determine the parameters of the equivalent circuit, No-load and blocked-rot...

No-load and blocked-rotor tests are conducted on a three-phase,wye-connected inductionmotor with the following results. The line-to-line voltage, line current, and total input powe

Define addressing modes of 8085, Define addressing modes of 8085. a) Im...

Define addressing modes of 8085. a) Immediate addressing b) Register addressing c) Direct addressing d)  Indirect addressing e)  Implicit 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