Advertisements
Advertisements
Question
Give the Barkhausen conditions for sustained oscillations.
Advertisements
Solution
Barkhausen conditions for sustained oscillations
The following condition called Barkhausen conditions should be satisfied for sustained oscillations in the oscillator.
- The loop phase shift must be 0° or integral multiples of 2π.
- The loop gain must be unity. |Aβ| = 1
Here; A – Voltage gain of the amplifier,
b – feedback ratio; (fraction of the output that is fed back to the input)
APPEARS IN
RELATED QUESTIONS
In a BJT, the largest current flow occurs ______.
Draw the circuit symbol for NPN and PNP transistors. What is the difference in the Emitter, Base, and Collector regions of a transistor?
The principle based on which a solar cell operates is ____________.
The condition to convert an amplified signal into an oscillating signal is ______
In common emitter mode of transistor, the d.c. current gain is 20, the emitter current is 7 mA. The collector current is ______.
A transistor is connected in C - E mode. If collector current is 72 × 10-5 A and α = 0.96, then base current will be ______.
A common emitter amplifier has a voltage gain of 50, an input impedance of 100Ω and an output impedance of 2000Ω. The power gain of the amplifier is ______.
The collector current in a common-emitter transistor amplifier is 4 mA. When the base current is increased by 20 µA, the collector current increases to 6 mA. The current gain is ______.
Define peak value of alternating signal.
Define α.
