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

Compute the real power inductive load, Q. A 60-Hz, 440-V, three-phase syste...

Q. A 60-Hz, 440-V, three-phase system feeds two balanced wye-connected loads in parallel. One load has a per-phase impedance of 8 + j3  and the other 4 - j1 . Compute the real po

What do you understand by analog to digital conversion, Q. What do you unde...

Q. What do you understand by Analog to Digital conversion? What do you understand by A/D conversion? Give an explanation of any one of the following A/D techniques: (i) Su

Rms values, 1. Derive the necessary formula/method to determine the effect...

1. Derive the necessary formula/method to determine the effective value or RMS of a triangular wave. Use either a similar method to the class example of the RMS determination

Find the effective noise temperature, Q. An antenna with an effective noise...

Q. An antenna with an effective noise temperature of 130 K couples through a waveguide that has a loss of 0.8 dB to a receiver. Find the effective noise temperature presented by th

DC motor, why DC motors use field winding instead of armature winding

why DC motors use field winding instead of armature winding

Emitter follwer, Ask questertion #Minimum 100 words accepted#

Ask questertion #Minimum 100 words accepted#

Communication, can I get matlab code for out of band radiation reduction of...

can I get matlab code for out of band radiation reduction ofdm system

Determine the function of time for the clock, Q. Determine the function of ...

Q. Determine the function of time for the clock? Given the block diagram for a 4-bit shift-left register shown in Figure (a), draw the output (Q 0 , Q 1 , Q 2 , Q 3 , and data

Magnetic field in the core, We can use Ampere's Law to calculate the magnet...

We can use Ampere's Law to calculate the magnetic field in the core.

Impact of abnormal solar winds on the earth, (a) Provide examples of intent...

(a) Provide examples of intentional electromagnetic sources and examples of unintentional sources. (b) Describe the process of the formation of lightning. (c) Reduce each of

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