Merits and demerits of collector-to-base bias, Electrical Engineering

Assignment Help:

Merits and Demerits of Collector-to-base bias:

Merits:

In this type of circuit the circuit stabilizes the operating point against differences in temperature and β (that is replacement of transistor)

Demerits:

In this type of circuit, to keep Ic independent of β, the subsequent condition must be met:

Ic = βIb = β(Vcc - Vbe)/ Rb + Rc + βRc ≈ (Vcc - Vbe) / Rc

This is the case while

βRc >> Rb

As β-value is set (and usually not known) for a given transistor, this relation can be satisfied either through keeping Rc fairly large or making Rb very low.

If Rc is large, a high Vcc is essential that increases cost also precautions are essential while handling.

The reverse bias of the collector-base region is small If Rb is low that limits the range of collector voltage swing which leaves the transistor in active mode.

The resistor Rb causes an AC feedback, decreasing the voltage gain of the amplifier. This not desirable effect is a trade-off for greater Q-point stability.


Related Discussions:- Merits and demerits of collector-to-base bias

Calculate motor efficiency, 1. A self excited shunt generator supplies a lo...

1. A self excited shunt generator supplies a load of 12.5 kw at 125 volts. The field resistance is 25 ohms and the armature resistance is 0.2 ohms. The total voltage drop because o

Find the current by means of mesh-current analysis, For the network shown i...

For the network shown in Figure, find the current delivered by the 10-V source and the voltage across the 3- resistor by means of mesh-current analysis.

Measurement and control systems, Electronic signals are used by almost all ...

Electronic signals are used by almost all measurement and control systems to transfer information. Much of this data is in the form of analogue voltages, which are prone to the ef

Electromechanical meters, Electromechanical Meters Electromechanical e...

Electromechanical Meters Electromechanical energy meters are based on the Ferraris Principle (see note in the margin). The working of these meters is explained. Working o

Metering techniques, Metering Techniques The techniques of metering co...

Metering Techniques The techniques of metering could be categorized depending upon the voltage at which consumers are fed as: 1. LT (Low Tension) Metering, and 2. HT (Hi

On line ups systems - power supplies , On line UPS Systems In this Ups ...

On line UPS Systems In this Ups  there are two  switches  one is  main static switch  and another  is Ups  static  switch . in normal  operation the Ups  static switch  remains

Evaluate gm and pm for the asymptotic bode plot, Q. The loop gain of an ele...

Q. The loop gain of an elementary feedback control system(see Figure) is given by G(s)·H(s), which is 10/(1+s/2)(1+s/6)(1+s/50). Sketch the asymptotic Bode plot of the loop-gain fu

What is meant by biasing transistor, Q. What is meant by biasing transistor...

Q. What is meant by biasing transistor? The purpose of dc biasing of transistor is to obtain a certain dc collector current at a certain dc collector voltage. These values of c

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