Active-mode npn transistors in circuits, Electrical Engineering

Active-mode NPN transistors in circuits

940_Active-mode NPN transistors in circuits.png

Figure:  Structure and use of NPN transistor. Arrow according to schematic.

The figure opposite is a schematic presentation of an NPN transistor associated to two voltage sources. To construct the transistor conduct appreciable current (on the order of 1 mA) from C to E, VBE have to be above a minimum value sometimes considered to as the cut-in voltage. The cut-in voltage is generally about 600 mV for silicon BJTs at room temperature but can be different depending upon the sort of transistor and its biasing. This applied voltage results in the lower P-N junction to 'turn-on' permitting a flow of electrons from the emitter into the base. In active mode, the electric field lay between base and collector (caused by VCE) will cause the majority of these electrons to cross the upper P-N junction into the collector to make the collector current IC. The remainder of the electrons again combines with holes, the majority carriers in the base, making a current by the base connection to form the base current, IB. As displayed in the figure, the emitter current, IE, is the total transistor current that is the sum of the other terminal currents (that is IE=IB+IC).

Posted Date: 1/10/2013 6:47:08 AM | Location : United States







Related Discussions:- Active-mode npn transistors in circuits, Assignment Help, Ask Question on Active-mode npn transistors in circuits, Get Answer, Expert's Help, Active-mode npn transistors in circuits Discussions

Write discussion on Active-mode npn transistors in circuits
Your posts are moderated
Related Questions
CMP Compare Instruction This instruction is used to compare the contents  of register  or memory  with accumulator the contents of the operand remain  unaffected. There are tw

Q. Find the exponential form of the Fourier series of the periodic signal given in Figure. Also determine the resulting series if T = 2τ .


Give the names of four alloys along with their composition, which are used for making heater and thermocouple elements. Constantan or Eureka {(55 to 60 percent) Cu, (45 to 40 p

Q. Show the Octal Number System? Though this was once a popular number base, especially in the Digital Equipment Corporation PDP/8 and other old computer systems, it is rarely


Q. A 60-Hz, 440-V, three-phase system feeds two balanced wye-connected loads in parallel. One load has a per-phase impedance of 8 + j3  and the other 4 - j1 . Compute the real po

Condition Return Similar to conditional jump and call  instructions there are conditional return  instructions  also  based on various  flags.

For an operating point half way up the parallel section and the discharge valve and the discharge fully open, design a proportional only controller which will give closed loop dyna

Q. Illustrate the basic use of binary in IT ? The binary system is thus useful in IT because not only any number, but any information, can be represented in terms of only 0s an