Doering_9_2S - Move cursor until gain reads as close...

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9.2 – Bode Plots, Section 9-3 Summary Comparison: Results: LF asymptote (dB) LF asymptote (deg) HF asymptote (dB) HF asymptote (deg) LF corner (kHz) HF corner (kHz) Analysis 9.630 180 -20.00 180 0.1592 4.823 Simulation 9.613 180 -20.01 180 0.1580 4.852 Measurement 9.62 180 -20 180 0.1585 5.012 Relative Differences: Simulation -- Analysis -0.2% 0.0% 0.1% 0.0% -0.8% 0.6% Measurement -- Analysis 0.1% 0.0% -0.1% 0.0% 0.3% 3.3%
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Analytical Solution:
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myDAQ Results:
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Bode Analyzer setup and measurement of low-frequency asymptotes: Low-frequency asymptotes: 9.62 dB and +180 °
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High-frequency asymptotes: This is a difficult measurement due to the limited frequency range of myDAQ compared to simulation. Estimate that magnitude converges to -20dB and phase converges to +180 ° . Move cursor until gain reads as close to 9.6 – 3.0 dB (6.6 dB) as possible. Low-frequency corner = 158.5 Hz
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Unformatted text preview: . Move cursor until gain reads as close to -20dB + 3.0 dB (-17 dB) as possible. High-frequency corner = 5012 Hz . Further Exploration: Circuit created with Multisim “NI myDAQ Design” project: Compare simulation results (green trace) and measurement results (yellow trace): NOTE : Must select “Op-Amp Signal Polarity” = “Inverted” to make the measured phase response trace overlay the simulated response (Multisim apparently does not account for the inverting nature of this op amp filter circuit when using the Bode Analyzer). The simulated and measured frequency response plots are remarkably similar considering that 5% resistors and 10% capacitors are used to construct the circuit. The phase becomes a bit more dissimilar at higher frequencies, likely due to limitations in the op amp....
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Doering_9_2S - Move cursor until gain reads as close...

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