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
Derive Equation 13-20 pertaining to the conversion algorithm based on redefined unit capacitor

Discuss the various types of memory devices that you are familiar with. All of the memory utilized as main store in a modern computer is implemented like semiconductors fabrica

how to wire a three phase contactor to become a single phase contactor?

Q. Explain about Half Duplex Transmission? Half Duplex Transmission A half-duplex channel can receive andsend, though not at the same instance. It's like a one-lane bridge w

Problem : a) What is an "Embedded System"? Discuss the characteristics of Embedded Systems. b) Describe three downfalls of "Embedded Systems". c) Explain the difference b



A LIT (linear time-invariant) system, impulse response h [ n ], is described by: (a) Show the block-diagram representation for this FIR filter (only use multiplier, adder

Q. Consider a 1-bit version of the digital comparator shown in Figure. Note that the operation of this circuit is such that whichever output is 1 gives the desired magnitude compar

A dc machine, operating as a generator, develops 400 V at its armature terminals, corresponding to a field current of 4 A, when the rotor is driven at 1200 r/min and the armature c