Merits and demerits of fixed bias with emitter resistor, Electrical Engineering

Merits:

The circuit has the trend to stabilize operating point against changes in temperature and β-value.

Demerits:

In this type of circuit, to keep IC independent of β the following condition has to be met:

Ic = βIB = β (Vcc - Vbe)/ RB (β+1) RE ≈ (Vcc - Vbe) / RE

That is approximately the case if

(β + 1) RE >> RB

As β-value is set for a given transistor, this relation can be satisfied either through keeping RE very large or by making RB very low.

High VCC is essential if RE is of large value. This increases cost also precautions are essential while handling.

A separate low voltage supply should be employed in the base circuit if RB is low. By using two supplies of different voltages is not practical.

Posted Date: 1/10/2013 7:21:23 AM | Location : United States







Related Discussions:- Merits and demerits of fixed bias with emitter resistor, Assignment Help, Ask Question on Merits and demerits of fixed bias with emitter resistor, Get Answer, Expert's Help, Merits and demerits of fixed bias with emitter resistor Discussions

Write discussion on Merits and demerits of fixed bias with emitter resistor
Your posts are moderated
Related Questions

Differentiate between LBM and EBM process on the basis of application and limitations.

Selection of Proper Fuse : Fuse is a safety device or a wire of metal in a cut-out which may be fused by an excessive current. The current drawn by an appliance is restricted by t

Explain Bimetals. Bimetals : It is made of two metallic strips of not like metal alloys with various coefficients of thermal expansion. At a specific temperature the strip wil

what is decibel

Fast  Recovery diodes The fast  recovery  diodes low recovery times. These diodes  are manufactured by diffusion. They are used in converter circuits where  the speed  of reco

please give the source coding of fast decoupled method

i want to plot a system current transfer matrix element vs frequency curve.how can i draw it?any suggestion.

how thyristor work in speed control??

Discuss the function of instruction queue in 8086? In 8086, a 6-byte instruction queue is presented at the Bus Interface Unit (BIU). It is used to pre fetch and store at the ma