Advertisements
Advertisements
प्रश्न
How is a transistor biased to be in active state?
Advertisements
उत्तर
There are two conditions for a transistor to be into an active region.
1. The input circuit should be forward biased by using a low voltage battery.
2. The output circuit should be reverse biased by using a high voltage battery.
APPEARS IN
संबंधित प्रश्न
What are α and β parameters for a transistor? Obtain a relation between them.
Write clearly, why in the case of a transistor (i) the base is thin and lightly doped
Write clearly, why in the case of a transistor (ii) the emitter is heavily doped.
Write the functions of the three segments of a transistor.
The figure shows the input waveforms A and B for ‘AND’ gate. Draw the output waveform and write the truth table for this logic gate.
Draw a typical input and output characteristics of an n-p-n transistor in CE configuration. Show how these characteristics can be used to determine (a) the input resistance (r1), and (b) current amplification factor (β)
Draw typical output characteristics of an n-p-n transistor in CE configuration. Show how these characteristics can be used to determine output resistance.
The output characteristic curve of a transistor at constant input current is plotted between
If an emitter current is changed by 4 mA, the collector current changes by 3.5 mA. The value of β will be ______.
Sanya performed an experiment of obtaining characteristic curves of a junction diode. When she forward biased it, she found that beyond forward voltage V = Vk, the conductivity is very high. When she reverse biased the diode she found that a very small current (of about a few microamperes) flows in the diode. It remained constant even though she varied the voltage.
(i) In Figure 1 below, which one of the diodes is forward biased?
Figure 1
(ii) What is meant by a saturation current?
(iii) When applied voltage during forward bias is small, why does no current flow in the diode?
(iv) The circuit shown in Figure 2 below contains two diodes, each with a forward resistance of 50 Ω and with infinite resistance during reverse bias. If the battery voltage is 6V, then calculate the current through the 100 Ω resistance.
Figure 2
