Voltage divider bias, Electrical Engineering

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

Posted Date: 1/10/2013 7:23:32 AM | Location : United States







Related Discussions:- Voltage divider bias, Assignment Help, Ask Question on Voltage divider bias, Get Answer, Expert's Help, Voltage divider bias Discussions

Write discussion on Voltage divider bias
Your posts are moderated
Related Questions
Molecular Chain (MIT, Princeton, Colorado) Consider a one-dimensional chain consisting of N molecules which exist in two configurations, α, β, with corresponding energies  and

Earth Leakage : Earth leakage takes place when, through some fault in an appliance or its connections. Electric current escapes to earth i.e. the body of the appliance become 'liv

applications of electronics device (bjt,mosfets) in civil engineering

Need answers of a question bank of power electronics . It is an assignment. Urgent

Q. Advantage of digital technology? The primary advantage of digital technology is the low cost, simplicity, and versatility of the digital building blocks. Because digital sig

Determine the Service and Backwash Rates The system on site is a pressure sand filter, with a service curve. The filter is backwashed using the feed pump, at a higher flow rat

Q. Explain about Adaptive Control System? Another type of control system that makes use of the computer is known as adaptive control, which is functionally represented in Figur

Advantages of Expert System The system, once set up, requires to be tested employing data with known outcomes to see if it functions correctly. If it's being used to diagnos

Q. Use MATLAB to obtain the Laplace transform of the waveform f(t) = [200t e -25t + 10 e -50t sin(25t)]u(t) which consists of a damped ramp and a damped sine. Also show the

Q. Give the classification of oscillators. Discuss the frequency stability of oscillators. Oscillators are classified in the following different ways. 1. According to the wa