adde some stuff

src/cheatsheets/Digitaltechnik.typ

@@ -282,8 +282,10 @@
 
         $beta_"n/p" = (mu_"n/p" epsilon_0 epsilon_"ox")/(t_"ox") W/L = K'_"n/p" W/L$
 
-        $R_"on" = $
-        
+        #grid(columns: (1fr, 1fr),
+          $C_"G" = epsilon_"ox" epsilon_0 (W L)/t_"ox"$,
+          $R_"on" = U_"DS"/I_"D"$
+        )
       ]
     )
 
@@ -298,10 +300,12 @@
       [
         - Source am *niedrigen* Potenzial (*GND*)
         - Guter PULL-DOWN
+        - Substrat am GND
       ],
       [
         - Source am *hohes* Potenzial (*$V_"DD"$*)
         - Guter PULL-UP
+        - Substrat am $V_"DD"$
       ],
 
       align(center+horizon, scale(