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


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
Q. The power gain of an antenna is 10,000. If its input power is 1 kW, calculate the maximum radiation intensity that it can generate.

Q. Explain Time-Dependent Circuit Analysis? The response of networks to time-varying sources is considered in this chapter. The special case of sinusoidal signals is of particu

Q. Explain about Rotating Machines? Themost widely used electromechanical device is a rotatingmachine, which utilizes themagnetic field to store energy. The main purpose of mos

#question what are the types of lines used there and their application ..

what is the effect of back emf ?

#The requirement is as follows- There is a signal which is in the range of 0 to 5Hz. This signal frequency composition is to determined. The resolution of the determination is 1Hz.

Internalization of KPI Process It is the responsibility of management to ensure in which the focus of all the participants in performance management and KPI exercise is there

Q. What is the requirement of a hybrid in telephone networks? How does it work? Ans: Digital exchanges require receive and transmit signals on separate two-wire circuits. Th

Q. A Silicon Transistor Whose Common Emitter Output Characteristics Are Shown  In Dig Is Used In The Circuit With V cc =22.5v, R c =5.6k, R e =1k, R 2 =10k, And R 1 =90