(PRELIMINARY)
1. Lab goals
- Topics
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Transistor small-signal model parameters and small-signal circuit analysis.
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Prediction and measurement of amplifier input resistance, voltage gain, and output resistance.
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2. DC solution
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Calculate the DC values of all node voltages and collector currents in the Figure 1, “CB + EF Amplifier” circuit.
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Build the circuit and measure the node voltages ("Ohm’s law" the collector currents) to verify that you have both done the calculations correctly and have a functioning amplifier.
3. AC circuit performance
3.1. Measurements
Set the signal generator to an amplitude of 20 mVp-p at 1 kHz. The 50 Ω resistor is inside the generator and is its Thevenin-equivalent output resistance.
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Measure the voltage gain of the amplifier vout / vin.
Use the concepts of equivalent input and output resistance to make a strategy to measure the amplifier’s Rin and Rout as shown in Figure 1, “CB + EF Amplifier”.
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Measure the amplifier’s Rin and Rout using your technique.
3.2. Predictions
Re-draw the schematic as a cascade of two general voltage-in / voltage-out amplifiers. (see the whiteboard figure) Use this structure and your DC bias solutions to calculate each sub-amplifier’s input resistance, output resistance, and voltage gain.
See the Guidebook bjt-amplifiers.html.
From those numbers, predict the composite amplifier’s Rin, Rout, and voltage gain. This should include the effects of the signal generator’s output resistance and the load resistance.
References
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[[[341-notes]]] D. White, ECE 341 Class notes 2019 folder, https://drive.google.com/drive/folders/1vzdLxzTUAC6xXF6YjVcDRuy_BKR7gzDz?usp=sharing
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[[[341-docs]]] D. White, ECE 341 reference documents folder, https://drive.google.com/folderview?id=0B5O5cSaA0tEQYVpaSnJxMGFrdHM
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[AoE] P. Horowitz and W. Hill, The Art of Electronics 3rd ed. (affiliate link), Cambridge University Press, 2015. https://artofelectronics.net
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[L-AoE] T. Hayes, Learning the Art of Electronics: A Hands-On Lab Course (affiliate link), Cambridge University Press, 2016. https://learningtheartofelectronics.com
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[LEC] Tony R. Kuphaldt, Lessons in Electric Circuits, Source version: https://www.ibiblio.org/kuphaldt/electricCircuits/, All About Circuits version: https://www.allaboutcircuits.com/textbook/
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[CL-book] Michael F. Robbins, CircuitLab, Ultimate Electronics: Practical Circuit Design and Analysis, https://www.circuitlab.com/textbook/
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[TCA] Alfred D. Gronner, Transistor Circuit Analysis, Simon & Schuster, 1970, https://archive.org/details/TransistorCircuitAnalysis
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[CMOS VLSI] Neil Weste and David Harris, CMOS VLSI Design - A Circuit and Systems Perspective, 4th edition. Addison-Wesley, 2011. http://pages.hmc.edu/harris/cmosvlsi/4e/index.html
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[Guidebook] D. White, Guidebook for Electronics II. https://agnd.net/valpo/341/guidebook
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[Gummel-Poon] H.K. Gummel, H.C. Poon, An Integral Charge Control Model of Bipolar Transistors. Bell System Technical Journal, 49: 5. May-June 1970 pp 827-852. https://archive.org/details/bstj49-5-827
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[ROHM] ROHM Semiconductor, Electronics Basics, http://www.rohm.com/web/global/en_index
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[vishay-e-series] Vishay, Standard Series Values in a Decade for Resistances and Capacitances, https://www.vishay.com/docs/28372/e-series.pdf