Fixed bias with emitter resistor, Electrical Engineering

Assignment Help:

Fixed bias with emitter resistor:

711_Usage.png

Figure: Fixed bias with emitter resistor

The fixed bias circuit is changed through attaching an external resistor to the emitter. This resistor establishes negative feedback which stabilizes the Q-point. From the voltage law of Kirchhoff, the voltage across the base resistor is

VRb = VCC - IeRe - Vbe.

From the law of Ohm, the base current is

Ib = VRb / Rb.

The manner feedback controls the bias point is like this. If Vbe is stay constant and temperature get increases, emitter current also increases. Though, a larger Ie increases the emitter voltage Ve = IeRe, in turn which decreases the voltage VRb across the base resistor. A lower base-resistor voltage drop decreases the base current that results in less collector current since Ic = ß IB. Collector current and emitter current are related through the Ic = α Ie with α ≈ 1, thus an increase in emitter current with temperature is opposed, and operating point is kept stable.


Related Discussions:- Fixed bias with emitter resistor

Find the rated and maximum torques, A 4000-V, 5000-hp, 60-Hz, 12-pole synch...

A 4000-V, 5000-hp, 60-Hz, 12-pole synchronous motor, with a synchronous reactance of 4  per phase (based on cylindrical-rotor theory), is excited to produce unity power factor at

Ratio, how do ratos connect to engineering

how do ratos connect to engineering

Emirrer feedback bias, RE should be made large enough to swamp out rB/ B. h...

RE should be made large enough to swamp out rB/ B. how does making RE large saturate the transistor b

Draw the logic diagram of the enabled d latch, Q. (a) Draw the logic diagra...

Q. (a) Draw the logic diagram of the enabled D latch using only NAND gates. (b) Complete the timing diagram of Figure (a) of theDlatchwhose block diagram and truth table are giv

Daa decimal adjust accumulator instruction , DAA Decimal Adjust Accumulator...

DAA Decimal Adjust Accumulator Instruction This  instruction adjusts the contents  of the accumulator  into BDC (Binary Coded Decimal )  form  after a BCD  addition. It should

What do you mean by byte, Q. What do you mean by Byte? Without question...

Q. What do you mean by Byte? Without question, the most vital data structure used by the 80x86 microprocessor is the byte this is true since the ASCII code is a 7-bit non-weigh

8 bit data to memory - move immediate instruction , 8 bit  data to memory ...

8 bit  data to memory This form  of the  instruction is used to  copy 8 bit  data directly  to the memory  location pointed  by register pair HL.  The instruction  format is

Show the r’s complement, Q. Show the r’s Complement? Step1- get the (r-...

Q. Show the r’s Complement? Step1- get the (r-1)'s complement Step 2- add 1 to the result ex.            935 10                                     9 9 9

Explain inductorless filters, Q. Explain Inductorless Filters Inductorl...

Q. Explain Inductorless Filters Inductorless (Active) Filters Filters (used to pass or eliminate certain frequency components of a signal) that are suitable for IC fabricati

BASIC ELECTRICLE, kindly tell me which text book is usefull forlearn the ba...

kindly tell me which text book is usefull forlearn the basic electricle.

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