Advertisements
Advertisements
प्रश्न
Define the terms : Input resistance How are these determined using typical input and output characteristics?
Advertisements
उत्तर
Input resistance may be defined as the ratio of small change in the base-emitter voltage (ΔVBE) to the resulting change in base current (IB) at constant collector-emitter voltage (VCE).
Input resistance, `R_i=(DeltaV_(BE))/(DeltaI_B)`
To find the input resistance, mark a point P on the input characteristic. Now, draw a tangent at point P. The reciprocal of slope of AB will give the input resistance
APPEARS IN
संबंधित प्रश्न
For a CE-transistor amplifier, the audio signal voltage across the collector resistance of 2 kΩ is 2 V. Suppose the current amplification factor of the transistor is 100, find the input signal voltage and base current if the base resistance is 1 kΩ.
Draw a circuit diagram of a transistor amplifier in CE configuration.
With the help of necessary circuit diagram, describe briefly how n-p-n transistor in CE configuration amplifies a small sinusoidal input voltage. Write the expression for the ac current gain
Derive an expression for voltage gain of the amplifier and hence show that the output voltage is in opposite phase with the input voltage.
Draw a circuit diagram for studying the input and output characteristics of a n-p-n transistor in common emitter configuration. Using the circuit, explain how input, output characteristics are obtained
Figure shows a block diagram of a transmitter identify the boxes ‘X’ and ‘Y’ and write their functions.
Figure shows a block diagram of a detector for amplitude modulated signal. Identify the boxes ‘X’ and ‘Y’ and write their functions.
Consider an amplifier circuit using a transistor. The output power is several times greater than the input power. Where does the extra power come from?
In a common base amplifier, the phase difference between the input signal voltage and output voltage is ______.
In common emitter amplifier, the current gain is 62. The collector resistance and input resistance are 5 kΩ and 500 Ω respectively. If the input voltage is 0.01 V, the output voltage is:
