lab_EE1L1_2.1_RLC_2025-11-13

🏠 Homework

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✏️ Execises

1. Second order circuit

EE1L1_LTSpice_1_2025-11-09

${\omega }_0=\frac{1}{\sqrt{LC}}=100\text{k rad/s}$

$\alpha =\frac{R}{2L}$ ${\omega }_d=\sqrt{{\omega }_0^2-{\alpha }^2}$

sim results are comparable to real life, only with some noise

circuit	resistance	R-50	measured ${\omega }_d$	$f$
${\omega }_0=\alpha$	$200\Omega$	$150\Omega$	0rad/s	0Hz
${\omega }_0=0.25$	$50\Omega$	$0\Omega$	96,824.6 rad/s	15,411.3 Hz
${\omega }_0=5\alpha$	$1000\Omega$	$950\Omega$	97,979.6 rad/s	15,595.3 Hz

2. AC-DC reectifier with one diode

circuit 1 looks exactly the same, the negative part is cut off

forward voltage = 0.7V

at high frequency we get a stead voltage, because the capacitor is kept charged, and slowly discharged because of the resistor (higher $\tau$) so at lower frequencies the output begins to look more like a sine that goes to 0 because the period is longer, the capacitor can discharge

with a higher resistance the capacitor discharges slower, so it gives a more steady voltage at a lower frequency

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📄Assignment