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Lab7.315 - EECE-315 Prelab 7 Assume = 150 Analyze all...

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EECE-315 Prelab 7 Assume β = 150. Analyze all circuits shown in Fig. 1, Fig. 2 and Fig. 3 of Lab-7. (a) Derive I CQ and V CEQ . Verify the transistor is biased in its active region. (b) Assume all capacitors have infinite capacitances. Derive the (ac) voltage gain. Note that there are two different cases for the circuit shown in Fig.1; with C E and without C E . (c) Derive the input resistance seen by the ac input voltage source for the circuit shown in Fig. 3. In the laboratory, you can measure the input resistance of an amplifier as follows: a. Adjust the input voltage until the output voltage is P volts unclipped peak-to-peak at a frequency in the midband (e.g. 10 kHz). b. Leaving the input voltage at this setting, place a decade resistance box between the input voltage source and the amplifier. Adjust the decade box until the output voltage drops to 0.5P volts peak-to-peak. The setting of the decade box is the input resistance.
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EECE-315 Lab 7
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