Transformer-coupled amplifiers, Electrical Engineering

Assignment Help:

Q. Transformer-coupled Amplifiers?

Transformer-coupled Amplifiers: The figure illustrates another type of coupling often used to couple audio frequencies - the untuned transformer. Because of the step-up property of the transformer, greater gain can be obtained with transformer coupling than with RC or impedance coupling. This greater gain, however, is obtained at the expense of narrowing the amplified bandwidth. Also, note that the transformer performs the double function of coupling ac variations and blocking the dc plate voltage from the grid of the next stage. The tuned transformer is usually used to couple radio-frequency amplifier stages. Capacitors (shown as dotted lines in figure) are placed parallel to the transformer primary and secondary,forming two parallel-tuned circuits. Greater gain and narrower bandwidth result from tuned transformer coupling if the merit factor (Q) of the tuned circuits is high.


Related Discussions:- Transformer-coupled amplifiers

State norton''s theorem, Norton's Theorem Nortons Theorem states: "A...

Norton's Theorem Nortons Theorem states: "Any linear circuit containing several energy sources and resistances can be replaced by a single Constant Current generator in para

Network reconductoring - technical loss reduction, Network Reconductoring -...

Network Reconductoring - Technical Loss Reduction The size of conductor/cable is a significant parameter as it determines the current density and the resistance of the line. A

Apparatus for BCD to excess 3, Apparatus for BCD to excess 3 convertor usin...

Apparatus for BCD to excess 3 convertor using nand and nor gates

How can we prove that radio waves are sine waves, What makes them sine? ...

What makes them sine? Ans) Fourier tells that only a sine wave has no harmonic content. The math works out that if you have any wave shape other than a sign wave, you can brea

Bad effects of armature reactions, Q.  What is meant by armature reaction....

Q.  What is meant by armature reaction. Explain briefly the bad effects of armature reactions.   Sol. By armature reaction is meant the effect of magnetic field set up

Show step-motor control system, Q. Show Step-motor control system? Figu...

Q. Show Step-motor control system? Figure illustrates a system in which the prime mover used in the disk-drive system is a step motor driven by pulse commands. In response to e

Working of a sweep frequency generator, Q. With suitable diagram explains t...

Q. With suitable diagram explains the working of a sweep frequency generator. Sol. A sweep frequency generator or sweeper is a special type of signal generator in which the o

Write notes on clamping, Q. Write notes on clamping ? Clamping network ...

Q. Write notes on clamping ? Clamping network shifts (clamps) a signal to a different d.c level, that is it introduces a d.c. level to an a.c signal. Hence, the clamping networ

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