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Asst. Prof. Dr. Asst. Prof. Dr. MontreeMontree SIRIPRUCHYANUNSIRIPRUCHYANUNDept. of Teacher Training in Electrical Engineering,King Mongkut’s Institute of Technology North Bangkok

Tuned Circuit and Tuned AmplifierTuned Circuit and Tuned Amplifier

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Find the resonant frequency, Q, Bandwidth and the haft-power frequencies of a series circuit having L=5μH, C=100pF and R=10ΩAns: fo=7.12MHz, Q=22.4, B=318kHz, fL=6.96MHz and fH=7.28MHz

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A parallel RLC circuit has an inductance of 100nH, Q =100,a resonant frequency of 100MHz, and Find R, C, Bandwidth and the haft-power frequencies Ans: R=6.28kΩ, C=25.3pF, B=1MHz, fL=99.5MHz and fH=100.5MHz

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The resonant frequency of the circuit shown is 860kHz, and the -3dB bandwidth is 25kHz. Calculate Qo, the Q of the coil (L=200μH)

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The coil Q is 80 while the Q of the capacitor is 200 at the resonant frequency. Plot the frequency re4sponse of the circuit shown.(L=300μH not 300mH)

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The circuit shown resonates at 600kHz and has a bandwidth of 15kHz. Assuming ideal capacitors, calculate the inductance of the coil and the coil Q.

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The coil Q is 50 at the resonant frequency. The peak magnitude input of vin is 2V

(a) Select C1 and C2 to result in fo=300kHz and a bandwidth of BW=15kHz.

(b) Calculate vout at resonance.

(c) Calculate vout at f=280kHz.

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The transistor β is 100 and rout=200kΩ. The coil Q is 40 at the desired resonant frequency of 1MHz. The bandwidth of vout is to be 50kHz

(a) Calculate the capacitance needed.

(b) Select the value of R1 required.

(c) Calculate the resonant voltage gain.

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From the tuned amplifier

(a) Calculate C1 and C2 to maintain a resonant frequency of 1MHz and a bandwidth of 50kHz.

(b) Calculate the resonant frequency voltage gain.