## SUPPLEMENTARY PROBLEMS

 25 Refer to the block diagram in Fig. 2-20. If A V = 50 and B = 0.01, will the circuit oscillate? If not, calculate the required value of A V. 26 Refer again to Fig. 2-20. If A V = 50 and B = 0.04, will the circuit oscillate? 27 Refer again to Fig. 2-20. If B = -0.05, what value of A V is required to sustain oscillations? 28 Refer to Fig. 2-20. Assume A V = 100 and B = 0.01. Calculate v fb if V out = 30 V p-p 29 Refer to Fig. 2-31. Calculate the following: ( a) f osc; ( b) the feedback fraction B; ( c) , , and ; ( d) X T (net reactance) of the L 2 C 3 branch. Figure 2-31 30 Refer again to Fig. 2-31. If C 3 is increased to 154.4 pF, calculate: ( a) f osc; ( b) , , and ; ( c) X T of the L 2 C 3 branch. 31 Refer to Fig. 2-31. Assume that it is desired to obtain an oscillating frequency of 4 MHz. If C 3 = 25 pF and B must equal , calculate: ( a) L T; ( b) L 1 and L 2; ( c) , ,...

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##### Topics of Interest

INTRODUCTION Modulation is the process of imposing information contained in a lower-frequency electronic signal onto a higher-frequency signal. The higher-frequency signal is called the carrier and...

2.2 RF OSCILLATOR CIRCUITS Let us apply our knowledge of oscillator fundamentals to some commonly used oscillator circuits. Figure 2-2( a) shows a popular circuit known as a Hartley oscillator. Its...

3.10 Problems For the problems in this chapter and all future chapters, assume the following transistor parameters: npn bipolar transistors: ? = 100 V A = 80 V ? b = 13 ps ? s = 4 ns r b = 330 ? n...

INDUCTIVE REACTANCE OF SIX-CONDUCTOR LINE Calculate the per-phase inductive reactance of a six-conductor, three-phase line at 377 rad/s consisting of Teal ACSR conductors (Fig. 9.5). Distance D a 1 c...

PROBLEMS   14.1    A photodiode with responsivity 0.3 A/W and dark current 2 nA is biased in the photoconductive mode, with a 9 V battery and 500 k resistor. Make a sketch like that of...

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