Explain the fixed bias circuit, Electrical Engineering

Assignment Help:

Q. Explain the fixed bias circuit?

          The Fig refers to the common emitter collector characteristics and the ac and dc load lines.The Fig shows the points Q1 and Q2 which refers to the operating point at the middle of the dc load line and the point which gives as large as an output possible without too much distortion respectively.

769_Explain the fixed bias circuit.png

 

Biasing is usually done to prevent thermal runaway which damages the transistor permanently. One kind of biasing is the fixed bias circuit.

Analyzing the input loop of the circuit by KVL

Vcc=IbRb + Vbe.

Ib=(Vcc-Vbe)/Rb.

Ic=bIb.

Analyzing the output loop of the circuit by KVL.

Vcc=Ic+Vce

Vce=Vcc-Ic.Rc.

Hence through the input and output loop we have calculated the output current(Ic) and output voltage (Vce).

The current Ib is constant and the network in the dig 2 is called the fixed bias circuit.

In summary we see that selection point Q depends upon a number of factors. Among these factors are the ac and dc loads of the stage the available power supply the maximum power ratings, the peak signal excursions to be handled by the stage and the tolerable distortion.


Related Discussions:- Explain the fixed bias circuit

LED, what ternary alloy, composition and binary substrate can be used for ...

what ternary alloy, composition and binary substrate can be used for an LED at 1.55 µm optical fiber windo

Comperators, How to build a 6 bit comparator?

How to build a 6 bit comparator?

What do you man by subtractive polarity, Q. Show polarity markings for a si...

Q. Show polarity markings for a single-phase transformer for (a) subtractive polarity, and (b) additive polarity.

Explain about rotating machines, Q. Explain about Rotating Machines? Th...

Q. Explain about Rotating Machines? Themost widely used electromechanical device is a rotatingmachine, which utilizes themagnetic field to store energy. The main purpose of mos

Real power sources - overview, We have seen that a practical power source m...

We have seen that a practical power source may be modelled by an ideal constant voltage source in series with a resistor - a Thevenin equivalent circuit Alternati

Autotransformer, conversion of auto transformer in to winding transformer a...

conversion of auto transformer in to winding transformer and vice versa

Cma complement accumulator instruction, CMA Complement Accumulator  Instru...

CMA Complement Accumulator  Instruction Complement the  contents of the accumulator  i e the   accumulator  al once are converted zeros  and all zeros  are converted to  ones.

Single phase meters, Single Phase Meters Single phase meters are commo...

Single Phase Meters Single phase meters are commonly rated for 240 V AC supply; the current ratings are 5/10, 10/20, 2.5/10 or 5/20 A or are for direct connection to the mains

Uses of fet, Uses of FET IGBTs (Insulated-gate bipolar transistor) se...

Uses of FET IGBTs (Insulated-gate bipolar transistor) see application in switching internal combustion engine ignition coils, in which fast switching and voltage blocking cap

Obtain voltage sing the laplace transform method, Obtain v(t) in the circui...

Obtain v(t) in the circuit of Figure by using the Laplace transform method.

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