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

What is extended data output ram, What is extended data output RAM? EDO...

What is extended data output RAM? EDO RAM: A slight modification to the DRAM structure changes the device in an EDO (extended data output) DRAM device. Inside the EDO memory, a

Explain extrinsic semiconductor, Explain Extrinsic Semiconductor. Extr...

Explain Extrinsic Semiconductor. Extrinsic Semiconductor: An intrinsic semiconductor is able to conduct some current even at room temperature but as this is not helpful for t

Fixed capacitor, what is the contruction of a fixed capacitor

what is the contruction of a fixed capacitor

Explain the power transmission lines, Explain the Power Transmission Lines ...

Explain the Power Transmission Lines Transmission and distribution of electric power is accomplished by using overhead lines or underground cables. Overhead lines are normally

Define the spectral resolution of satellite, Q. Define the spectral resolut...

Q. Define the spectral resolution of satellite? Spectral resolution : The sensitivity to different features of earth is the most important aspects considered in the spectral

Calculate the current flow through rl, Using star-delta transformation, cal...

Using star-delta transformation, calculate the current flow through RL.

Calculate the rms value, The sinusoidal voltage source in the circuit shown...

The sinusoidal voltage source in the circuit shown in Fig. is developing an rms voltage of 2000 V. The 4 ? load in the circuit is absorbing four times as much average power as the

Calculate the value of the wavelength, In an electron microscope, a beam of...

In an electron microscope, a beam of electrons is produced by a device called an electron gun. In the electron gun, electrons are 'boiled off' from a heated filament (which is the

What are the main embedded system components, What are the main embedded sy...

What are the main embedded system components? Main Embedded System Components a. Embeds hardware to provide computer as functionalities b. Embeds major application softw

Perform analysis and calculate the values of vgs, A small signal amplifier ...

A small signal amplifier circuit is given in figure Q 4. The values of RD and RS must be set such that the gain of the system is 8. It is also known that Vgs = ¼ Vp. a). Per

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