On increasing the reverse bias to a large value in a pn junction diode, the current
When the reverse bias voltage is increased, a stage is reached when the charge carries (electrons and holes) are accelerated by the reverse bias voltage and acquire kinetic energy so as to break the covalent bonds in the semiconductor by collisions. The freed electrons can do the same and a rapidly increasing number of energetic electrons are produced. Consequently, the reverse current increases very rapidly.
In a transistor amplifier, the two ac current gains as defined as . The relation between is
In a transistor, a change of 8.0 mA in the emitter current produces a change of 7.8 mA in the collector current. What change in the base current is necessary to produce the same change in the collector current?
In a common emitter amplifier, the output resistance is and the input resistance . In the peak value of the signal voltage is 10 mV and , then the peak value of the output voltage is
The base current of a transistor is and the collector current is 2 mA. What is the current gain for the common base configuration?
In the depletion region of an unbiased pn junction diode, there are
An oscillator is nothing but an amplifier with
When Ge crystals are doped with phosphorus atom, then it becomes
The transfer ratio of a transistor is 50. The input resistance of the when used in the common emitter configuration is . The peak value of the collector ac current for an ac input voltage for 0.01 V peak is
In a common base transistor circuit, the current gain is 0.98. On changing in the emitter current by 5.00 mA, the change in the collector current is
When arsenic is added as an impurity to silicon, the resulting material is