Advertisements
Advertisements
प्रश्न
Give the Barkhausen conditions for sustained oscillations.
उत्तर
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
संबंधित प्रश्न
Assuming VCEsat = 0.2 V and β = 50, find the minimum base current (IB) required to drive the transistor given in the figure to saturation.
In the symbol for a transistor, the arrow head points in the direction of the ____________.
In an npn transistor, the base current is 100 µA and the collector current is 10 mA. The emitter current is ______.
In transistor amplifier, base-emitter junction is forward biased and collector emitter junction is reverse biased. The current gain is ______.
For an ideal diode, the current in the following arrangement is ______.
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 base current in common emitter mode of the transistor changes by 10 µA. If the current gain of the transistor is 50, then change in collector current 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 ______.
In a CE amplifier, the current gain is 80 and the emitter current is 9 mA. The base current is ______.
Define α.
