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sample_lab342 - ECE-342 Lab 5: BJT Amplifier This sample...

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Unformatted text preview: ECE-342 Lab 5: BJT Amplifier This sample report from the 2007 ECE-342 Lab 5 assignment is meant to serve as a guide for lab reports for ECE-342 and ECE-343 Sample Lab Report Don Hummels, Someone Else September 2, 2008 Abstract Required Section: Very short de- scription of what is in this report. Enough information so that a reader can assess whether this report is one that they should check out. The design and test of a common-emitter BJT amplifier is described. The amplifier uses two NPN transistors to form a current-source bias network, and a single 2N2222A NPN transistor as the common-emitter amplifier. The am- plifier requires +10 V and- 5 V supplies, and achieved a measured 46.5 dB gain with 7.8 k Ω input impedance at 1 kHz, and 1.2 MHz 3-dB Bandwidth. Component selection and test procedures are described. 1 Contents 1 Introduction 3 2 Circuit Development and Analysis 3 2.1 CE Amplifier: Selection of R L and I C 3 . . . . . . . . . . . . . . . . 4 2.2 Design of the Current Source: Selection of R 1 . . . . . . . . . . . . 5 2.3 Low-Frequency Performance: Selection of C . . . . . . . . . . . . 6 3 Simulated Performance 7 4 Experimental Implementation 8 4.1 Generation of the input signal . . . . . . . . . . . . . . . . . . . . . 8 4.2 Measurement of the output signal . . . . . . . . . . . . . . . . . . . 9 4.3 Measurement results . . . . . . . . . . . . . . . . . . . . . . . . . 10 5 Discussion 12 6 Conclusion 13 A Lab 5 Assignment 14 B Time Management and Documentation 15 C General Notes for ECE-343 Lab Reports 16 2 1 Introduction Required Section: Give an overview of the lab, and a short outline of the report that will follow. Generally avoid equations. (Leave the details to later sections.) Do give a preview of the results. Your report should stand on its own. Do not assume that the reader has assignment sheet. This report describes the design, implementation and test of a common-emitter am- plifier using 2N2222A NPN BJT transistors. 1 A two-transistor current source is used to provide the required bias current for the single-transistor common-emitter amplifier. The amplifier requires +10 V and- 5 V supplies, and is designed to achieve a nominal “mid-band” gain of 46 dB. Specific Lab 5 requirements are sum- marized in the Lab 5 Assignment sheet, included as Appendix A. The amplifier was constructed using a solderless breadboard, and lab measurements verify that the amplifier achieved a peak gain of 46.5 dB at 5 kHz, with 3-dB band ranging from 73 Hz to 1.2 MHz. Section 2 describes the development of the amplifier, including the selection of components and the prediction of the lower cutoff frequency. Circuit simulation results are presented in Section 3, and experimental measurements and procedures are presented in Section 4. Section 5 gives a summary and comparison of the simu- lated and measured results, and addresses specific questions associated with the lab assignment....
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sample_lab342 - ECE-342 Lab 5: BJT Amplifier This sample...

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