5 31 Analyze The Performance Of The Fm Circuit Of Fig 5 8b Assume That The Voltage Appearing Across The Reverse Biased 1 (20.99 KiB) Viewed 40 times
5 31 Analyze The Performance Of The Fm Circuit Of Fig 5 8b Assume That The Voltage Appearing Across The Reverse Biased 2 (29.62 KiB) Viewed 40 times
5-31 Analyze the performance of the FM circuit of Fig. 5-8b. Assume that the voltage appearing across the reverse-biased diodes, which provide the voltage variable capacitance, is v(i) = 5+ 0.05 mi), where the modulating signal is a test tone, m() = cos = 2mfi, and fi = 1 kHz. The capacitance of each of the biased diodes is C 100V1 + 2v(1) pF. Assume that Co-180 pF and that L is chosen to resonate at 5 MHz. (a) Find the value of L. (b) Show that the resulting oscillator signal is an FM signal. For convenience, assume that the peak level of the oscillator signal is 10 V. Find the parameter D.
a 5-40 The calibration of a frequency deviation monitor is to be verified by using a Bessel function test. An FM test signal with a calculated frequency deviation is generated by frequency mod- ulating a sine wave onto a carrier. Assume that the sine wave has a frequency of 2 kHz and that the amplitude of the sine wave is slowly increased from zero until the discrete carrier term (at f) of the FM signal vanishes, as observed on a spectrum analyzer. What is the peak frequency deviation of the FM test signal when the discrete carrier term is zero? Suppose that the amplitude of the sine wave is increased further until this discrete carrier term appears, reaches a maximum, and then disappears again. What is the peak frequency deviation of the FM test signal now?
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