Max Vout: What is the Maximum Voltage Output?

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Discussion Overview

The discussion centers around determining the maximum output voltage (Vout) in a circuit, with participants exploring various input values and the role of diodes in limiting output voltage. The scope includes theoretical considerations and circuit behavior analysis.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants express uncertainty about the maximum value of Vout, with one suggesting it could be 0 V due to insufficient details.
  • Another participant clarifies that the maximum output voltage should consider all possible input values.
  • Several participants question whether the maximum output voltage is 5V, with some repeating this uncertainty.
  • One participant proposes that if a voltage is forced onto the output, it could affect the maximum voltage observed.
  • There is a suggestion that the output voltage is limited to a minimum of 5V, although this is later contested as potentially being a maximum instead.
  • One participant mentions that if the diode turns on when the voltage exceeds a certain threshold, it could create a short to a voltage source, thus pinning the output voltage.
  • Another participant discusses the behavior of the circuit with varying output voltage values and the implications of using an ideal versus non-ideal diode.
  • There is a claim that the maximum output voltage could be 5.7V, factoring in the forward voltage drop of the diode.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the maximum output voltage, with multiple competing views regarding the role of the diode and the conditions under which Vout is limited.

Contextual Notes

There are unresolved assumptions regarding the ideality of the diode and the specific circuit configuration, which may affect the maximum output voltage calculations.

luigihs
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Approx what is the maximum value of Vout

voltages.jpg


I don't have any idea I am just guessing but there's not enough details I think is 0 V but I am not sure.. how am I suppose to answer this??
 
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They want the maximum output voltage, which applies to all possible input values.
 
I don't understand is that 5V?
 
luigihs said:
I don't understand is that 5V?

Grab Vo, what if you try to force a voltage on it. (The actual forcing could be done by a source connected to Vin)
 
The output voltage is limited to a minimum of 5V. ?
 
luigihs said:
The output voltage is limited to a minimum of 5V. ?

You mean a maximum of 5V. If you go higher the diode turns on and there is a short to a voltage source that pins the voltage. Is there a diode drop involved?
 
Ok so is maximum ?
 
You can try different voltage values at the output and see how the circuit behaves.

If the diode is not ideal, then there is no theoretical limit on the output voltage due to limited positive-biased diode impedance. However, I assume that the diode is ideal and thus is positively-biased and turns once the output voltage exceeds the cathode voltage.
 
Does this make it any easier to understand. It's the same circuit. If Vin >> 5V the diode conducts and stops Vout going any higher.
 

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  • #10
so that means it could be 5.7 V? or more
 
  • #11
No, it means it can't be more than 5.7V (=5V+Vf).

If Vin >> 5V current flows from Vin, through the resistor, through the diode to the +5V rail.
 

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