Lab 5 Writeup - Albert Ho ECE 315 Tuesday lab Lab 05...

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Albert Ho ECE 315 Tuesday lab Lab 05 writeup Objective: The purpose of this lab was to examine the common emitter/source amplifiers in both in the resistively-loaded and actively-loaded stages. Equipment: Tektronix/Sony function generator PC – Keithley CTrace software, Waveform Manager Pro 2 Keithley SMU’s (Source Measurement Units) - denotation: SMU1 is for sweeping, and SMU2 is for stepping CA3046 IC (contains 3 standalone NPN Bipolar Junction Transistors, and a differential pair) ALD1116 IC (contains 2 n-channel bulk-tied MOSFETs) ALD1117 IC (contains 2 p-channel bulk-tied MOSFETs) Breadboard + resistors and capacitors as needed Experimental Results: BJT resistively-loaded common-emitter amplifier Figure A : Circuit diagram for a BJT resistively-loaded common-emitter amplifier (left) and same circuit except the input consists of a DC bias and AC sinusoid from signal generator (right)
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We first built the left circuit on Figure A using a load resistor of 5 kΩ. Using the Keithley SMU’s, we measured V out and V in by sweeping V in voltage from 0.6 to 0.8 V for roughly 100 points with a current limit of 10 mA. Using the stepping SMU, we stepped the current through and measured V out . The following is a plot of the transfer function for a BJT resistively-loaded common-emitter amplifier (V out as a function of V in ): Figure B : Transfer function (V out vs. V in ) for a BJT resistively-loaded (R L = 5 kΩ) common-emitter amplifier The plot in Figure B was obtained from the following raw data: V(out) and V(in) data for BJT resistively-loaded common emitter amplifier Data saved at: 14:47:58 04/12/05 Data Sheet from Keithley Instruments Curvetracer. Columns alternate Voltage then Current data for each sweep. SMU1 Voltage V(in) SMU2 Voltage V(out) 0.5999909 4.959294 0.6020025 4.956667 0.6040171 4.953805 0.6059942 4.950793 0.6080063 4.947529 Figure C : Raw data collection for V out and V in values for the BJT resistively-loaded common-emitter amplifier After obtaining a plot of the transfer function, we then built the circuit on the right of Figure A. This setup is different from the left setup in that it provides us with an input consisting of both a DC bias and an AC function. The DC bias comes from the V + source and is run through a voltage divider. The sinusoidal AC voltage comes from the V S input, which is connected to a Tektronix signal generator. The input from the generator is processed by first blocking out the DC signal with a capacitor. Then a voltage divider consisting of R 1 , R 2 , R 3 and r π (transistor’s input resistance) will attenuate the AC signal.
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The following are the resistor values we used in order to realize 2.5 V DC at the output of the setup. We took a resistance measurement to obtain the R 4 potentiometer resistance that had been adjusted: R 1 = 989 Ω R 4 = 21.5 kΩ R 2 = 8.09 kΩ R 5 = 505 Ω R 3 = 5 kΩ We first examine gain vs. amplitude by inputting a 1 kHz sine wave from the Tektronix generator. Measuring v in and v
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Lab 5 Writeup - Albert Ho ECE 315 Tuesday lab Lab 05...

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