2. Consider a simple AM radio consisting of a tunable L-C circuit. The input is the voltage received by the antenna v,(t), and the output is the voltage vo(t) to an amplifier. The ODE governing the circuit is 4C- d²vo dt² +2× 10 4 dvo dt +2x10¹vo = 2 × 10 4 dus +1 × 10 2vx dt (2) where C is capacitance of the variable capacitor to select stations. (a) Determine the transfer function from vs(t) to vo(t). (b) When C = 50 × 10 12 F, determine the poles and the zeros of the system. (c) Input A is sinusoidal with frequency of 3 ×106 rad/s. Input B is sinusoidal with frequency of 1 x107 rad/s. When C = 50×10-12 F, if both inputs have the same amplitude, which input will lead to a smaller output? Why? (Hint: Don't need to calculate anything.) (d) What is the physical meaning of the magnitude and phase of the transfer function?

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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2. Consider a simple AM radio consisting of a tunable L-C circuit. The input is the voltage
received by the antenna v,(t), and the output is the voltage vo(t) to an amplifier. The ODE
governing the circuit is
4C-
d²vo
dt²
+2× 10 4 dvo
dt
+2x10¹vo = 2 × 10 4 dus
+1 × 10 2vx
dt
(2)
where C is capacitance of the variable capacitor to select stations.
(a) Determine the transfer function from vs(t) to vo(t).
(b) When C = 50 × 10 12 F, determine the poles and the zeros of the system.
(c) Input A is sinusoidal with frequency of 3 ×106 rad/s. Input B is sinusoidal with frequency
of 1 x107 rad/s. When C = 50×10-12 F, if both inputs have the same amplitude, which
input will lead to a smaller output? Why? (Hint: Don't need to calculate anything.)
(d) What is the physical meaning of the magnitude and phase of the transfer function?
Transcribed Image Text:2. Consider a simple AM radio consisting of a tunable L-C circuit. The input is the voltage received by the antenna v,(t), and the output is the voltage vo(t) to an amplifier. The ODE governing the circuit is 4C- d²vo dt² +2× 10 4 dvo dt +2x10¹vo = 2 × 10 4 dus +1 × 10 2vx dt (2) where C is capacitance of the variable capacitor to select stations. (a) Determine the transfer function from vs(t) to vo(t). (b) When C = 50 × 10 12 F, determine the poles and the zeros of the system. (c) Input A is sinusoidal with frequency of 3 ×106 rad/s. Input B is sinusoidal with frequency of 1 x107 rad/s. When C = 50×10-12 F, if both inputs have the same amplitude, which input will lead to a smaller output? Why? (Hint: Don't need to calculate anything.) (d) What is the physical meaning of the magnitude and phase of the transfer function?
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