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Q. What is balanced discriminator?
A balanced discriminator with the corresponding frequency characteristics is depicted in Figure. The rising half of the frequency characteristic of a tuned circuit, shown in Figure (b), may not have a wide enough linear region. In order to obtain a linear characteristic over a wider range of frequencies [see Figure (d)], usually two circuits tuned at two frequencies f1 and f2 [with the frequency response shown in Figure (c)] are used in a balanced discriminator [Figure (a)].
Figure shows a block diagram of an FM demodulator with feedback (FMFB), in which the FM discrimination is placed in a feedback system that uses a VCO path for feedback. The bandwidth of the discriminator and the subsequent low-pass filter is matched with that of the message signal, which is the output of the low-pass filter.
Q. An FM station's modulator has a sensitivity k FM = 5π × 10 4 rad/s·V. A receiver uses a discriminator that has a gain constant of 10 -5 /π V·s/rad. Neglecting noise, determin
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