I want to design a diode circuit

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Discussion Overview

The discussion revolves around designing a diode circuit that produces a specific output voltage (Vo) in relation to an input voltage (Vi), with particular characteristics defined for different ranges of Vi. The scope includes circuit design, diode functionality, and the potential use of additional components.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant outlines a desired Vo vs. Vi relationship with specific linear and constant segments.
  • Another participant questions the feasibility of achieving the desired output using only diodes, suggesting that a more complex circuit with transistors and resistors might be necessary.
  • A different participant proposes using diodes, voltage sources, and resistors, expressing uncertainty about how to achieve specific output values at certain input levels.
  • One participant references the concept of 'piecewise linear' circuits using zener diodes and resistors, suggesting it could be a viable approach and provides a resource for further exploration.
  • A later reply indicates satisfaction with a solution that does not use zener diodes but instead employs a diode and a voltage source, while expressing hope that the solution is correct.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of using only diodes for the circuit design, with some suggesting additional components may be necessary. The discussion does not reach a consensus on the best approach.

Contextual Notes

Participants mention specific output conditions that may depend on the arrangement and values of components, which remain unresolved. There is also uncertainty regarding the effectiveness of the proposed solutions.

Nickclark
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i want to design a diode circuit where the Vo vs. Vi looks like this:

Vi between -2 and 2 Vo = Vi

Vi between 2 and 4 Vo is a linear with slope 0.5
Vi between -2 and -4 Vo is a linear with slope 0.5

Vi>4 Vo=3
Vi<4 Vo=-3

how can i do this?
 
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Just with diodes? Are you sure this is possible?

With a lot of transistors and resistors? That is possible, but it could look messy.
 
you can use diodes, voltage sources, and resistors.
i don't know how to get Vo=3 if Vi=4 and Vo=-3 if Vi=4 in one circuit!
 
This takes me back to generating arbitrary laws with 'piecewise linear' circuits using zener diodes and resistors. I googled the term and saw this link, which does the sort of thing I think you are after. (about half way through the slide show). Google the same term and you should get some other suggestions.
You'd have to work out the resistors for yourself but you should be able to solve the problem that way.
 
That's exactly what i was looking for! Thank you!
I solved it without zener, but used diode and a voltage source instead, hopefully it's correct!
Thanks again!
 

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