Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision		 Previous revision
lab_electrical_engineering:triangle-to-rectangular_conversion_schmitt_trigger [2026/06/17 11:36] – [Background Information] mexleadminlab_electrical_engineering:triangle-to-rectangular_conversion_schmitt_trigger [2026/06/17 15:01] (current) – mexleadmin
Line 1: Line 1:
 +~~PAGEBREAK~~
 =====Triangle-to-Rectangular Conversion - Schmitt Trigger===== =====Triangle-to-Rectangular Conversion - Schmitt Trigger=====
  
Line 6: Line 7:
 back the output signal, i.e., returning it to the non-inverting input (+ input). back the output signal, i.e., returning it to the non-inverting input (+ input).
 In the circuit shown, the feedback is provided by resistor $R_\mathrm{2}$.\\ In the circuit shown, the feedback is provided by resistor $R_\mathrm{2}$.\\
-\\  
 <wrap left> <wrap left>
-{{drawio>mexlefirst_intern:non_inverting_schmitt_trigger_circuit.svg}}+{{drawio>non_inverting_schmitt_trigger_circuit.svg}}
 </wrap> </wrap>
-\\  +~~CLEARFIX~~ 
-\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ +
 The output voltage $u_\mathrm{a}$ can only take two values, either $\mathrm{+}U_\mathrm{sat}$ The output voltage $u_\mathrm{a}$ can only take two values, either $\mathrm{+}U_\mathrm{sat}$
 or $\mathrm{-}U_\mathrm{sat}$. It switches between these two values when no voltage drops or $\mathrm{-}U_\mathrm{sat}$. It switches between these two values when no voltage drops
-at the differential input of the OPV, ($u_\mathrm{d}=0$).+at the differential input of the OPV, ($u_\mathrm{d}=0$).\\
 Then $i_\mathrm{R2}=\frac{u_\mathrm{a}}{R_\mathrm{2}}$ and Then $i_\mathrm{R2}=\frac{u_\mathrm{a}}{R_\mathrm{2}}$ and
 $u_\mathrm{e}=-R_\mathrm{1} \cdot i_\mathrm{R1}$. $u_\mathrm{e}=-R_\mathrm{1} \cdot i_\mathrm{R1}$.
Line 23: Line 23:
 \\  \\ 
 <wrap left> <wrap left>
-{{drawio>mexlefirst_intern:non_inverting_schmitt_trigger_characteristic_input_output_signal.svg}}+{{drawio>non_inverting_schmitt_trigger_characteristic_input_output_signal.svg}}
 </wrap> </wrap>
-\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ +~~CLEARFIX~~ 
 The image shows the input/output characteristic curve of the circuit known as a  The image shows the input/output characteristic curve of the circuit known as a 
 “non-inverting Schmitt trigger.” The reaction to any input signal is shown on the right.  “non-inverting Schmitt trigger.” The reaction to any input signal is shown on the right. 
Line 31: Line 32:
 threshold at the input is reached. It only switches to $\mathrm{-}U_\mathrm{sat}$, when the threshold at the input is reached. It only switches to $\mathrm{-}U_\mathrm{sat}$, when the
 negative switching threshold at the input is reached. negative switching threshold at the input is reached.
 +\\ 
 +~~PAGEBREAK~~ 
 ====Experimental Tasks==== ====Experimental Tasks====
  
Line 37: Line 39:
 \\  \\ 
 <wrap left> <wrap left>
-{{drawio>mexlefirst_intern:schmitt_trigger_circuit_experiment.svg}}+{{drawio>schmitt_trigger_circuit_experiment.svg}}
 </wrap> </wrap>
 \\  \\ 
Line 47: Line 49:
 Values of the components used:\\  Values of the components used:\\ 
 R2 = 20kΩ, R3 = 27kΩ\\  R2 = 20kΩ, R3 = 27kΩ\\ 
-\\  + 
-\\  +~~CLEARFIX~~ 
-\\  + 
-\\  +  - Calculate the switching thresholds using the given values. \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\  
-\\  +  - Roughly sketch the voltage curves that you expect at the SQ output when you apply a triangular signal to Ue whose amplitude just reaches the switching points. \\ \\ **Output SQ**\\ \\ <wrap left>{{drawio>oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1:$\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$  ~~CLEARFIX~~ \\ \\ \\ 
-\\  +  - Set up the Schmitt Trigger on the MEXLE-Board. Perform the following measurements on the Schmitt Trigger: 
-\\ +
-\\  +
-\\  +
-  - Calculate the switching thresholds using the given values. +
-  - Roughly sketch the voltage curves that you expect at the SQ output when you apply a triangular signal to Ue whose amplitude just reaches the switching points. \\ \\ **Output SQ**\\ \\ <wrap left>{{drawio>mexlefirst_intern:oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1:$\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\  +
-  - Set up the Schmitt Trigger on the MEXLE-Board. **Please use the level shifting circuit at the input of the circuit.** Perform the following measurements on the Schmitt Trigger: +
       * Connect channel 1 on the oscilloscope to 𝑈𝑒 and channel 2 to SQ.        * Connect channel 1 on the oscilloscope to 𝑈𝑒 and channel 2 to SQ. 
       * Connect the function generator to the Ue input. Set it to triangle with a frequency of 1kHz and a voltage of 3 V (amplitude).        * Connect the function generator to the Ue input. Set it to triangle with a frequency of 1kHz and a voltage of 3 V (amplitude). 
-      * Sketch the oscilloscope screen image. \\ \\ **Ue = 3 V (amplitude), f = 1 kHz**\\ \\ <wrap left>{{drawio>mexlefirst_intern:oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$\\ \\ \\ \\ \\ \\ \\ \\ \\  +      * Sketch the oscilloscope screen image.   
-  - Sketch the oscilloscope screen image you would expect for 1 V (amplitude). \\ \\ **Ue = 1 V (amplitude), f = 1 kHz**\\ \\ <wrap left>{{drawio>mexlefirst_intern:oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$\\ \\ \\ \\ \\ \\ \\ \\ \\  +~~CLEARFIX~~  
-  - Compare your measurements with the calculation from sub-task 1 and the forecast from 2. Explain the results.+\\  <wrap outdent> **Ue = 3 V (amplitude), f = 1 kHz**</wrap> 
 +\\ \\ <wrap left>{{drawio>oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$ ~~CLEARFIX~~ \\ \\ \\ \\ 
 +  - Sketch the oscilloscope screen image you would expect for 1 V (amplitude). \\ \\ **Ue = 1 V (amplitude), f = 1 kHz**\\ \\ <wrap left>{{drawio>oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$ ~~CLEARFIX~~ \\ \\ \\ \\ 
 +  - Compare your measurements with the calculation from sub-task 1 and the forecast \\ Explain the results. \\ \\ \\ \\ \\ \\ \\ \\ \\ 
  
  
Line 69: Line 68:
 ====Test Questions - Schmitt Trigger==== ====Test Questions - Schmitt Trigger====
 </WRAP> </WRAP>
 +~~PAGEBREAK~~