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ece240: finish diodes

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eggy 2023-11-03 12:46:53 -04:00
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docs/2a/ece240.md
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@ -73,3 +73,18 @@ $$r_d=\left(\frac{\partial i_D}{\partial v_D}\right)^{-1} = \frac{V_T}{I_D}$$
$$i_D(t)=I_D+\frac{1}{r_d}V_d(t)$$
### Signal analysis
1. Analyse DC signals
- assume blocking capacitors are open circuits
- turn off AC sources
2. Analyse AC signals
- assume blocking capacitors are shorts
- turn off DC sources
- replace diode with effective resistor (the differential resistor)
!!! tip
Most $R$s in the circuit can be assumed to be significantly greater than $r_d$, so $r_d$ can be removed in series or $R$ can be removed in parallel.
!!! warning
Oftentimes, turning off a DC source to nowhere is actually a short to ground.