From Schaum's Outline of Theory and Problems of Electronic Communication, Second Edition



Refer to the block diagram in Fig. 2-20. If A V = 10 and B = 0.02, will the circuit oscillate? If not, calculate the required value of A V.

Figure 2-20


Refer to Fig. 2-20. If A V = 150 and B = 0.01, will the circuit oscillate?


Refer to Fig. 2-20. Assume B = -0.025. Calculate the value of A V required to satisfy the Barkhausen criterion.


Assume in Fig. 2-20 that V out = 24 V p-p (volts peak-to-peak) and B = 0.01. Calculate A V and V in.


Refer to Fig. 2-21. Assume L 1 = 496.67 H and L 2 = 9.93 H. 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 2-21


Refer to Fig. 2-21. Assume that it is desired to obtain an oscillating frequency of 500 kHz. If , calculate: ( a) L T; ( b) L 1 and L 2; ( c) , , and ; ( d) X T of the L 2 C 3 branch.


Refer to Fig. 2-22. If C 1 = 14.54 pF and C 2 = 435.27 pF, calculate...

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Topics of Interest

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.

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...

Fluids Control of flow systems: This is closest to 5:1. Answer is (B) To fill the missing numbers for line and equipment losses, assume the pump curve is flat. Therefore the discharge pressure...

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