4.2-5 You are asked to design a DSB-SC modulator to generate a modulated signal km(t) cos wet with the carrier frequency fc = 300 kHz (wc = 27 x 300, 000). The following equipment is available in the stock room: (i) a signal generator of frequency 100 kHz, (ii) a ring modulator, (iii) a bandpass filter tuned to 300 kHz. (a) Show how you can generate the desired signal. (b) If the output of the modulator is k · m(t) cos wet, find k.

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KVL and KCL

KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.

Sign Convention

Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.