Diode Current & Output Voltage Calculation with V(1)=10 V and V(0)=5 V

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Discussion Overview

The discussion revolves around calculating the current through diodes and the output voltage Vo in a circuit with specified voltage values (V(1)=10 V and V(0)=5 V) and a diode threshold of 0.6 V. Participants explore the application of Kirchhoff's laws and the behavior of diodes in the circuit.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests determining the state of the diodes by assuming one state and confirming it, noting difficulty in calculating certain voltages (VA and VB).
  • Another participant emphasizes that once a diode is on, it will clamp the potential to one diode-drop from the source, recommending to start with the highest potential sources.
  • There is a correction regarding the circuit diagram, where a participant points out the omission of a 5k resistor and the incorrect value of a 10k resistor, which is stated to be a 1k resistor instead.
  • Clarification is made that Vo is the output and is different from V(0), which is described as indicating a logic low of approximately 5V.
  • One participant shares an image of their work for feedback, asking if they are on the right track.
  • A later reply indicates that the work presented looks good.

Areas of Agreement / Disagreement

Participants generally agree on the approach to analyze the circuit and the distinction between Vo and V(0). However, there are unresolved issues regarding the circuit diagram and the specific values of components, indicating some disagreement on the details.

Contextual Notes

There are limitations in the discussion, such as missing assumptions about the circuit configuration and unresolved details regarding the component values in the circuit diagram.

Who May Find This Useful

Students and individuals interested in circuit analysis, diode behavior, and applications of Kirchhoff's laws may find this discussion relevant.

JasonHathaway
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Homework Statement


If V(1)=10 V and V(0)=5 V, and the voltage threshold for all diodes is 0.6 V. Determine the current through every diode and the output voltage Vo if V1=V4= 5V and V2=V3=10 V.
001.jpg

Homework Equations


Basic KCL & KVL.

The Attempt at a Solution



I know that the basic idea to determine whether the diode is on or off is by assuming one state and then confirm it. The thing is I could do that with two or three diodes at most. but I know another to determine its state which is done by determining the voltages on both the anode and the cathode separately. And that I what I was going, but I couldn't determine some voltages like VA and VB in the following figure:
002.jpg


Any help?
 
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Certain diodes being turned on will dominate things. Once a diode is on it will effectively "clamp" the potential to one diode-drop from the source that's driving that current. So look for the highest potential sources first and assume their diodes are on. See what that would imply for the others (look for contradictions).

In your equivalent circuit diagram you seem to have "lost" a 5k resistor, and the 10k resistor seems to have become a 1k resistor. You also left out the 5V source for Vo.
 
gneill said:
You also left out the 5V source for Vo.
There is no 5V source at Vo. Vo is our output.

Vo is different from V(0). :smile:

V(0) = 5V is just telling us that for this gate, LOGIC LOW is approx 5V
 
NascentOxygen said:
There is no 5V source at Vo. Vo is our output.

Vo is different from V(0). :smile:

V(0) = 5V is just telling us that for this gate, LOGIC LOW is approx 5V
Ah. I should have spotted that. Thanks.

My suggested approach still applies though.
 
Looking good.
 
Thanks. I really appreciate your help. :)
 

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