Lab 1 - ECE 420L
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Vouts magnitude (green) and phase shift (red) hand calculations shown above.
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Fig 1.22 circuit schematic
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**Note: Due to 1uF being used rather than the 1pF, simulation was altered
to produce relatively identical waveforms**
Hand calcs to find delay and rise times
Only td derivation shown since method
for deriving tr is similar
Simulation confirming hand calculated results
Waveform matching simulation results
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Revisit Fig 1.21 and performig frequency sweep.
f3db calculated by hand. it is the frequency
which causes real and imaginary contributions to be equal
| Frequency (Hz) | Magnitude (Volts) | Phase (degrees) | (dB) |
| 16 | 1 | 0 | 0 |
| 160 | 0.7 | 45 | -3 |
| 1.6K | 0.1 | 90 | -20 |
Critical values displayed to represent behavior of RC circuit
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From comparing experiment 1 and 2 we see that the adition of a capacitor parallel to the resistor greatly
reduced the phase shift, but did not have much effect on the magnitude.
Experiment 3 showed how a capacitor responds to a sudden change in voltge, specifically examining
the time required to reach critical points when charging.
Experiment 4 reviewed our good friend the frequency sweep. While transfer functions (Vin vs Vout) are ever popular in
power analysis, Frequency sweeps are used relentlessly in the analysis of systems.
