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Lab_8-Experiment_17

Lab_8-Experiment_17 - Randall Robert(9771 Experiment 17...

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Randall Robert (9771) Experiment 17 TUNED AMPLIFIER AND OSCILLATOR EE 3221 – 005 Partner: Jason M.

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OBJECTIVE : To study the characteristics of a tuned circuit, a class C amplifier, and a radio-frequency oscillator. Part 1 Connect the circuit show in Figure 1, and apply a sinusoidal signal of about Vp-p to the base of the transistor at a frequency of about 455khz. What is the voltage gain of the ckt? ٠ Gain = 400mv/500mv = 0.80 How large is the dc component of the voltage across the collector resistor compared to the rf signal? ٠ DC Voltage = 15-(VoDC) = 15-10.5 = 4.5V Part 2 Bypass the emitter with a 0.2μF, as shown in Figure 2.
What does the collector waveform look like now? ٠ X Y -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 10 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 10 0 Part 3 Bypass the 10k resistor in the collector circuit with a 0.01μF capacitor, add the tuned circuit as show in Figure 3, and remove the 0.02μF capacitor bypassing the emitter. Vary the frequency of the sinal generator until a maximum in signal strength is obtained across the tuned circuit.

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