2.a) Calculate Ay, Aj, Rin, and Rout on the circuit given in Figure 2. Assume that the coupling capacitors, Cci and Cco,

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2 A Calculate Ay Aj Rin And Rout On The Circuit Given In Figure 2 Assume That The Coupling Capacitors Cci And Cco 1 (47.05 KiB) Viewed 29 times

2.a) Calculate Ay, Aj, Rin, and Rout on the circuit given in Figure 2. Assume that the coupling capacitors, Cci and Cco, behave as open circuit for DC signals and as short circuit for AC signals. 2.b) Determine limits of the signal source, vs, for the transistor to remain in forward- active region. (Hint: AC current on RL will be added onto the quiescent emitter current.) Vcc=15V Q1: BC237 or BC238 B=200 Rs Ссі 220kΩ VBE(on)=0.7V F Kai 46 vs Сco RL 1.2k.12 1000 Rout Figure 2. Common-collector amplifier (emitter follower). RB 10012 4.7uF وام RE “| 4.7uF Rin 2.c) Simulate the emitter-follower circuit given in Figure 2. Verify that the function generator output is still set to 1 Vp-p, 1 kHz, and fulfill the following steps:
20 Measure the voltage gain. Ay. Use the oscilloscope in X-Y mode, probing s on Ch-1 (X) and wo on Ch-2 M). Vp-p = Vop-p- A. - 2e) Determine the current gain, A, by measuring the peak-to-peak AC voltages across Rg and RL VRSpe VRLpp 18p-p = LP-D A = 21 Disconnect R and measure the input resistance, Rin Use the oscilloscope in X-Y mode, probing is (voltage across Rs) on Ch-1(x) and son Ch-2 (7) Note that, the two osciloscope channels must share a single.common node for proper ground connection. Vape VRSpp = 18p-p- 2) Measure the voltage gain, Ay. Vape- Vopp A = 2h) Determine the current gain, A VRSpe= VRLpp = spe= A = 21 Disconnect R, and measure the input resistance, Rin- Vpp = VRSpe= 13p2- Rin= 2) Increase vs amplitude to 2.0 Vp-p and observe v, on the oscilloscope. How do you explain the distortion in the vo waveform? R. = ما 2k) Find a way to restore the waveform while keeping ys amplitude at 2.0 Vp-p. and R = 1000 Explain how you can restore the vo waveform 21 Set the function generator output back to 1 Vp-p, and measure the output resistance, Rout. You should use a smaller variable resistor such as 100 to obtain a better precision with emitter-follower. Vop-piNoLoad Rout