Advertisements
Advertisements
प्रश्न
Figure shows a block diagram of a transmitter identify the boxes ‘X’ and ‘Y’ and write their functions.
उत्तर
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
संबंधित प्रश्न
Write the functions of three segments of a transistor.
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?
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
Draw a labelled diagram of a common emitter amplifier, showing waveforms of the signal voltage and output voltage.
Figure shows a block diagram of a detector for amplitude modulated signal. Identify the boxes ‘X’ and ‘Y’ and write their functions.
Draw a circuit diagram for the common emitter transistor amplifier. What is meant by phase reversal?
A pnp transistor is used in common-emitter mode in an amplifier circuit. A change of 40 µA in the base current brings a change of 2 mA in collector current and 0.04 V in base emitter voltage. Which of the following is the correct value of the input resistor Rin?
When a junction transistor is used as an amplifier in CE-mode,
