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) , ,...