Solving Diode Logic Circuits: 4V, B=2V, C=3V

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SUMMARY

The discussion centers on troubleshooting a diode logic circuit with specified voltages: A = 4V, B = 2V, and C = 3V. The user initially miscalculated the output voltage due to overlooking the state of the first diode. After analyzing the circuit with a diode voltage drop of 0.7V and an on-resistance of 500 ohms, the user derived an output voltage (Vout) of 4.31V, which differs from the expected 4.03V. The correct understanding of diode states and their impact on circuit analysis is crucial for accurate voltage calculations.

PREREQUISITES
  • Understanding of diode voltage drop characteristics (0.7V for silicon diodes)
  • Basic circuit analysis techniques, including Kirchhoff's laws
  • Familiarity with resistor values and their impact on current flow
  • Knowledge of voltage nodes in electrical circuits
NEXT STEPS
  • Study diode logic circuit design and analysis techniques
  • Learn about Kirchhoff's Current Law (KCL) and its application in circuit analysis
  • Explore the effects of resistor values on current distribution in circuits
  • Investigate simulation tools for modeling diode circuits, such as LTspice or Multisim
USEFUL FOR

Electrical engineers, circuit designers, and students studying semiconductor devices and circuit analysis will benefit from this discussion.

Dirac8767
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EDIT: I was being stupid and forgot the first diode would turn off after i worked out stuff for diode C, thanks anyway, solution found!Hi I'm having some trouble getting the correct output voltage when i model the diodes using a voltage ofset and resistors.

A = 4V, B = 2V, C = 3V
Using Voltage drop across the diode of 0.7V and a on resistance of 500 ohms

Doing the analysis of the circuit in the attachments I conclude A & C are on.

I1 = I2 + I3

I1 = (5 - Vx)/1500

I2 = (Vx- 4.7)/500

I3 = (Vx- 3.7)/500

Once i re-arrange all of those i get Vout to be 4.31V whereas in the answers it should be 4.03V.

Any help would be gratefully received! many thanks

Edit: Vx is the node all the diodes are attached to
 

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only diode C will be ON
 

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