Voltage divider bias, Electrical Engineering

Assignment Help:

Voltage divider bias:

92_Voltage divider bias.png

The voltage divider is made by using external resistors R1 and R2. The voltage beyond than R2 forward biases the emitter junction. Via proper selection of resistors R1 and R2, the operating point of the transistor can be prepared independent of β. In this type of circuit, the voltage divider holds the base voltage fixed independent of base current given by the divider current is large as compared to the base current. Though, even with a fixed base voltage, collector current changes with temperature thus an emitter resistor is added to stabilize the Q-point, identical to the above circuits with emitter resistor.

In this circuit the base voltage is provided by:

VB = voltage across R2

= Vcc (R2) / (R1+R2) - IB (R1R2) / (R1+R2)

 Vcc (R2) / (R1+R2) provided IB << I2 = VB /R2

Also

VB = Vbe + IERE

For the given circuit,

1628_Voltage divider bias1.png


Related Discussions:- Voltage divider bias

Find the maximum radiation intensity, Q. An antenna has beam widths of 3° a...

Q. An antenna has beam widths of 3° and 10° in orthogonal planes and has a radiation ef?ciency factor of 0.6. Find the maximum radiation inten- sity if 1 kW is applied to the anten

Tampering of, Damage of revolving metallic disc due to tampering

Damage of revolving metallic disc due to tampering

Why are waveguides not used at low frequencies, Q. Comment brie?y on the fo...

Q. Comment brie?y on the following: (a) Why are waveguides not used at low frequencies? (b) Why are open-wire lines not generally used as guiding structures at very high freq

Electrical machine -i, What are the causes of sparking in the commutator? E...

What are the causes of sparking in the commutator? Explain the methods to reduce the sparking in the commutator?

Calculate minimum number of poles for the induction machine, A wound-rotor ...

A wound-rotor induction machine, driven by a dc motor whose speed can be controlled, is operated as a frequency changer. The three-phase stator winding of the induction machine is

Illustrate the components of flexible manufacturing system, What is FMS? Il...

What is FMS? Illustrate the components of Flexible Manufacturing System? Discuss the different kinds of Material Handling and Storage Systems?

Clampers, just to put an assignment Give only short details that are impor...

just to put an assignment Give only short details that are important Specially bised clamper

Describe the methods of improving commutation., There are two practical way...

There are two practical ways of improving commutation i.e. of making current reversal in the short - circuited coil as sparkless as possible. These methods are known as (i) resista

Data rates in pstns, Data rates in PSTNs: A voice channel in a PSTN is ...

Data rates in PSTNs: A voice channel in a PSTN is band limited with a nominal bandwidth of 3.1 kHz. A first-cut estimate of this can be attained from Nyquist's theorem that app

Power semiconductor-controlled drives, Q. Explain Power semiconductor-contr...

Q. Explain Power semiconductor-controlled drives? Power electronics deals with the applications of solid-state electronics for the control and conversion of electric power. Con

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