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circuit_design:uebung_2.1.3 [2021/11/13 13:00]
slinn 		circuit_design:uebung_2.1.3 [2023/12/01 01:23] (aktuell)
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 <panel type="info" title="Exercise 2.1.3 Z-diode as voltage reference"> <WRAP group><WRAP column 2%>{{fa>pencil?32}}</WRAP><WRAP column 92%> <panel type="info" title="Exercise 2.1.3 Z-diode as voltage reference"> <WRAP group><WRAP column 2%>{{fa>pencil?32}}</WRAP><WRAP column 92%>
  
-{{  elektronische_schaltungstechnik:z-diode_als_spannungsreferenz.png?nolink&300|z-Diode als Spannungsreferenz}}+The following circuit depicts a simple voltage reference circuit. There, a Z-diode provides a constant output voltage $U_\rm L$ on the load - despite a fluctuating input voltage $U_\rm S$ from the source. \\
  
-In a voltage reference circuit, a Z-diode enables - despite a fluctuating input voltage - an output voltage to be kept relatively constant. In the simplest case, a circuit as shown on the right can be used for this purpose. +The following quantities shall to be used: 
-The following quantities are to be used for the task: +  * Source voltage  $U_{\rm S}=7.0 ... 13.0~\rm V$ (e.g. via sinusoidal input voltage with $f = 50 ~\rm Hz$), 
-  * Source voltage $U_S=7.0 ... 13.0V$ (e.g. via sinusoidal input voltage with $f = 50 Hz$), +  * series resistor $R_{\rm V}=1.0~\rm k\Omega $ 
-  * series resistor $R_V=1.0k\Omega $ +  * load resistor   $R_{\rm L}= 10~\rm k\Omega $ 
-  * load resistor $R_L=10k\Omega $ +  * Z-diode $D_\rm Z$ as $\rm BZX84C6V2$ ($U_\rm Z = 6.2 ~\rm V$)
-  * Z-diode $D_Z$ as $BZX84C6V2$ ($U_Z = 6.2 V$)+
  
-An ideal (Z) diode would be assumed to hold the breakdown voltage $U_Z$ at all reverse currents $I_S$. \\+{{drawio>circuit_design:diagram1.svg}} 
 + 
 +An ideal Z-diode would be assumed to hold the breakdown voltage $U_\rm Z$ at all reverse currents $I_\rm S$. \\
 This is to be checked for the real diode. This is to be checked for the real diode.
  
   - Model the circuit in Tina TI and insert a picture of the circuit.   - Model the circuit in Tina TI and insert a picture of the circuit.
-  - Compare the progression of $U_L$ to $U_S$. In particular, measure the maximum and minimum values of $U_L$.  +  - Compare the progression of $U_\rm L$ to $U_\rm S$. In particular, measure the maximum and minimum values of $U_\rm L$.  
-  - Change the load resistance to $R_L=1.0k\Omega $ and perform the same comparison of $U_L$ to $U_S$ again.+  - Change the load resistance to $R_\rm L=1.0~\rm k\Omega $ and perform the same comparison of $U_\rm L$ to $U_\rm S$ again.
   - How can the difference be explained?    - How can the difference be explained? 
  
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