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Q. Explain about Zener Diodes?
Most diodes are not intended to be operated in the reverse breakdown region. Diodes designed expressly to operate in the breakdown region are called zener diodes. A nearly constant voltage in the breakdown region is obtained for a large range of reverse current through the control of semiconductor processes. The principal operating region for a zener diode is the negative of that for a regular diode in terms of both voltage and current. Zener diodes are employed in circuits for establishing reference voltages and for maintaining a constant voltage for a load in regulator circuits. Figure shows the device symbol along with the linearized i-v curve and the circuit model.
As seen from the i-v characteristic, a zener diode approximates an ideal diode in the forward region. However, when the reverse bias exceeds the zener voltage VZ, the diode starts to conduct in the reverse direction and acts like a small reverse resistance RZ in series with a battery VZ. Zener diodes are available with values of VZ in the range of 2 to 200 V. The circuit model of Figure (c) incorporates two ideal diodes, Df and Dr, to reflect the forward and reverse characteristics of the zener diode. The i-v curve thus has two breakpoints, one for each ideal diode, and three straight-line segments.
Primacy of MOSFET In the year 1959, Dawon Kahng and Martin M. (John) Atalla at Bell laboratory invented the MOSFET. Operationally and structurally diverse from the bipolar ju
A pure sine wave along with a frequency of 100Hz is sampled at 150Hz. At which point one of the subsequent frequencies would you expect an alias? A) 75Hz B) 100Hz C) 150Hz
List out the five categories of the 8085 instructions. Give examples of the instructions for each group. 1. Data transfer group - MOV, MVI, LXI. 2. Arithmetic group - ADD,
Design : Rather than 100 two-motion selectors as in the case of Design 3, let's consider only 24 two-motion selectors. In the case 24 simultaneous calls can be put through the swi
Q. The block diagram of Figure represents a multi loop control system. (a) Determine the transfer function C(s)/R(s). (b) For G 2 G 3 H 2 = 1, evaluate C(s)/R(s).
Q. With suitable diagram explains the working of a sweep frequency generator. Sol. A sweep frequency generator or sweeper is a special type of signal generator in which the o
internal dc generator
Q. For the coupled coils shown in Figure, a dot has been arbitrarily assigned to a terminal as indicated. Following the dot convention presented in the text, place the other dot in
CT 10VA, 50A/5A, 6ohz, 2.4KV required nominal primary voltage?
what is signal analysis
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