Advertisements
Advertisements
Question
Figure shows a block diagram of a transmitter identify the boxes ‘X’ and ‘Y’ and write their functions.
Advertisements
Solution
Modulator: Since the frequency range of signal is quiet low and it is associated with very small amount of energy, it dies out very soon if transmitted as such. So, it is modulated by mixing with very high frequency waves called carrier waves. This is done by modulator power. Amplifier: Since the signal gets weaken after travelling through long distances it cannot be transmitted as such. Thus, we use a power amplifier to provide it necessary power before feeding the signal to the transmitting antenna.
APPEARS IN
RELATED QUESTIONS
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.
Define the terms : Input resistance How are these determined using typical input and output characteristics?
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
Under what condition does the transistor act as an amplifier?
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
Gautam went for a vacation to the village where his grandmother lived. His grandmother took him to watch 'nautanki' one evening. They noticed a blackbox connected to the mike lying nearby. Gautam's grandmother did not know what that box was. When she asked this question to Gautam, he explained to her that it was an amplifier.
(i) Which values were displayed by the grandmother? How can inculcation of these values in students be promoted?
(ii) What is the function of an amplifier?
(iii) Which basic electronic device is used in the amplifier?
Figure shows a block diagram of a detector for amplitude modulated signal. Identify the boxes ‘X’ and ‘Y’ and write their functions.
Write the truth table of the following circuit. Name the gate represented by this circuit.
In a common base amplifier, the phase difference between the input signal voltage and output voltage is ______.
