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Q. Explain about Junction FET?
The JFET is a three-terminal, voltage-controlled current device, whereas the BJT is principally a three-terminal, current-controlled current device. The advantages associated with JFETs are much higher input resistance (on the order of 107 to 1010 ), lower noise, easier fabrication, and in some cases even the ability to handle higher currents and powers. The disadvantages, on the other hand, are slower speeds in switching circuits and smaller bandwidth for a given gain in an amplifier.
Figure shows the n-channel JFET and the p-channel JFET along with their circuit symbols. The JFET, which is a three-terminal device, consists of a single junction embedded in a semiconductor sample.When the base semiconductor forming the channel is of a n-type material, the device is known as an n-channel JFET; otherwise it is a p-channel JFET when the channel is
formed of a p-type semiconductor. The functions of source, drain, and gate are analogous to the emitter, collector, and base of the BJT. The gate provides the means to control the flow of charges between source and drain.
Q. What is Barkhausen criterion? Why is the value of Ab kept slightly greater than 1? The condition |Ab| = 1 is called the Barkhausen criterion. It implies that when |Ab| = 1,
1. The voltage across a 1 - μF capacitor is given. Which is the sinusoidal expression for the current? a) 30 sin200t b) 70cos (800t - 20°) 2. At what frequency will the re
A circular ring of magnetic material has a mean length of 1m and a cross sectional area of .001m^2.A sawcut of 5mm width is made in the ring . calculate the magnetizing current req
Q. Explain about Synchronous machines? Large ac power networks operating at a constant frequency of 60 Hz in the United States (50 Hz in Europe) rely almost exclusively on sync
Discuss merits and demerits of Macro over procedures. The MACRO directive informs assembler the starting of a macro which is used with ENDM directive to enclose a macro. The
I''m trying to design ADC using MAX1198 and DAC using IDAC in Multisim 12 but none of them are working. I need some help in this regard
Ask qu1. If the resistor Radj is adjusted to 175O what is the rotational speed of the motor at no-load conditions? 2. Assuming no armature reaction, what is the speed of the motor
Properties of a good heat sink For maximum efficiency, a heat sink should be 1)Be in good thermal contact with the transistor case 2)Have the largest surface area 3)Be
various types of electrical insulators used in electrical engineering
Four Quadrant Chopper or Class E chopper Figure class E chopper circuit Mode I When
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