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Laboratory Project 1b: Electromyogram Circuit |
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Report Contents and Grading |
1270
30 Communication
– IEEE single column, double spaced format, title, author, etc. (–20 pts if not used)
5 Style (written in the style of article, rather than disjointed figures and tables)
5 English (grammar, punctuation, and etc.)
5 Clarity (purpose of each section clearly explained)
3 Succinctness and precise wording (detailed information in as few words as possible)
3 Organization (ease of locating figures/code/equations/etc.)
3 Section numbers and headings (use section numbers shown below)
3 Equations explained (at least one sentence between equations)
3 Figures complete (every figure numbered, captioned, and referred to in text)
5 Abstract (succinct summary of results, including numerical values as appropriate)
10 I. Introduction
8 Motivation for lab [create EMG circuit, useful for medical diagnostics]
2 State report organization [briefly describe contents of sections that follow]
10 II. Electrode and Pre-Amp Modeling (Lab 1b Section V)
A. Electrode model
1 Introduce section [to demonstrate need for pre-amp to drive diff-amp]
1 Explain electrode model [small v-source in series with 1 MΩ]
1 Describe experiment simulating electrode driving diff-amp [include Fig. 2a]
1 Mention ratio of electrode model circuit output to input [v2/v6V pwr supply]
2 Explain that electrode unable to drive diff-amp [signal too small]
B. Pre-amp model
1 Explain pre-amp output model [small v-source in series with 10 Ω]
1 Describe experiment simulating pre-amp driving diff-amp [include Fig. 2a]
1 Mention ratio of pre-amp model circuit output to input [v2/v6V pwr supply]
1 Explain that pre-amp is able to drive diff-amp [signal out ≈ input]
5 III. Pre-Amp Construction (Lab 1a Section VI)
1 Describe pre-amp circuit [buffer configuration, output v = input v]
2 Include figure showing pre-amps schematic [Lab 1a Fig. 6b, crop out LED's]
1 Describe testing procedure
1 Describe testing results
25 IV. Differential Amplifier Design and Test (Lab 1b Section VI, VII.A,B)
A. Analysis of differential amplifier
1 Describe differential amplifier circuit [Lab 1b Fig. 4]
5 Derive the formula for v3
3 Derive the formula for v3 written in terms of vcm and vdm
5 Derive the formula for v3 written in terms of ¬=R1/R2=R3/R4
1 Explain that v3 written in terms of ¬ is only a function of vdm
B. Design of differential amplifier
1 Describe constraints for design (Lab 1b Section VIII.A)
3 Explain how resistor values were chosen
1 List values of resistors used in diff-amp
C. Testing of differential amplifier
1 Describe testing procedure [Lab 1b Fig. 7]
3 Show plot of v3 vs vs1 and vs2 with linear fit superimposed
1 Explain calculation of gain of diff-amp [= slope of plot] and list value of gain
10 V. EMG Measurement (Lab 1b Section VIII)
A. Measurement of EMG
1 Explain how electrodes and oscilloscope connected for EMG
3 Show plot of EMG from oscilloscope
B. Power vs weight for EMG signal
1 Explain how power for EMG calculated [Lab 1b Eqn (6)]
4 Show plot of power vs weight
1 Comment on plot [describe shape, possible measurement errors]
5 Conclusion (summarize key results; include numerical values as appropriate)