Look at the pulse trains that are shown in Figure A-2. Which of the following st

Question

Look at the pulse trains that are shown in Figure A-2. Which of the following statements correctly describes these pulse trains? Pulse train 1 is NRZ, and pulse train 2 is bipolar Pulse train 1 is PCM, and pulse train 2 is bipolar Pulse train 1 is unipolar, and pulse train 2 is alternating Pulse train 1 is unipolar, and pulse train 2 is bipolar Look at the limiter circuit that's shown in Figure A-3. The primary purpose of this circuit is to limit the frequency swing of the input signal. current level of the input signal. power level of the input signal. voltage level of the input signal. In the limiter circuit that's shown in Figure A-3, the purpose of R_c is to act as a collector load for the transistor. make the stage easily overdriven. broaden the bandpass of the coupling circuit. decouple the power supply from the circuit.

Explanation / Answer

1) pulse train 1 is unipolar and pulse train 2 is bipolar

Reason 1.unipolar return to zero:half of bit duration is high but it immediatly returns to zero and shows the absence of pulse during the remaing half of the bit duration

2.bipolar return to zero:An example of this type is Alternate Mark Inversion(AMI) for a bit 1 the voltage level gets transition from + to -,having alternate ones to be of equal polarity.a 0 will have zero voltage level

2) Voltage level of the signal

The limiter in FM is used to remove amplitude/voltage variations.In FM signal the frequency of carrier is varied.so if there are any variations in the amplitude of received signal due to noise or interference in the communication channel.so the amplitude/voltage variations are removed by limter circuit

3)The purpose of Rc is broaden the bandpass of coupling circuit

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