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NdeveR

  • 3 years ago

H4P1: Zener Regulator A non-ideal voltage source can be modeled by a series combination of an ideal DC voltage source, a resistance, and a small-signal voltage source. The small-signal source is included to represent the noise inherent in the source. This model is illustrated in the figure below: In practice, connecting the non-ideal voltage source to a load may result in undesirable effects due to the noise voltage vo appearing across the load. This problem studies such effects and how a Zener diode may be used to ameliorate the problem. Assume that VI=13.0V, RIN=1kΩ, and vi=20.0m

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  1. NdeveR
    • 3 years ago
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    there is more to this problem: and here are some pictures Again, we calculate vo (i.e. output noise) and VO (i.e. DC output voltage) for RL=2kΩ and RL=4kΩ for this new circuit. Hint: Your first job here is to determine which of the three regions of the piecewise-linear characteristic of the Zener is the one containing the operating point: we suggest you sketch a load line, but be very careful about the signs. Once you have determined where the operating point is, you can model the Zener in the circuit with a series combination of an independent voltage source and a resistor.

  2. NdeveR
    • 3 years ago
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    so far, i have only been able to solve for RL=2kohm, Vo is 8.6667 volts. if anyone could explain this one i'd appreciate it.

  3. nick67
    • 3 years ago
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    |dw:1348666679433:dw|

  4. nick67
    • 3 years ago
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    |dw:1348667042917:dw|

  5. nick67
    • 3 years ago
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    |dw:1348667163811:dw|

  6. nick67
    • 3 years ago
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    |dw:1348667507556:dw|

  7. Sparkle
    • 3 years ago
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    What about the last bit, minimum value of RL..Im getting it wrong.

  8. nick67
    • 3 years ago
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    @Sparkle could you better explain your problem, pls :-)

  9. dany
    • 3 years ago
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    Teh minimum value of RL is the value of RL when the voltage across the RL is equal to that of Vz

  10. yahya.aamir
    • 3 years ago
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    @nick67, I tried looking at the your explanation. But couldn't figure out the answer when the Zener diode is implemented. Could you please explain it again?

  11. nick67
    • 3 years ago
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    @yahya.aamir Hi, you should separate DC and AC analysis, this way: |dw:1349534424806:dw|

  12. nick67
    • 3 years ago
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    |dw:1349534977332:dw|

  13. yahya.aamir
    • 3 years ago
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    Thanks @nick67. I really appreciate it. :-)

  14. nick67
    • 3 years ago
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    you're welcome

  15. mahi1431
    • 3 years ago
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    hey plz explain me clearly

  16. nick67
    • 3 years ago
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    @Nurali could you post the question in a separate post ? I'm quite sure that Stefo should be very interested, too; he has big knowledge about FETs

  17. ammanjordan
    • 3 years ago
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    Can we have the results as results (Numbers)?

  18. nick67
    • 3 years ago
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    @ammanjordan from http://openstudy.com/code-of-conduct : Give Help, Not Answers I will encourage and guide those needing help, and not just give them an answer

  19. ammanjordan
    • 3 years ago
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    Thank nick67, solving the problem, i found the value of Vo for RL=ΚΩ, also, i found the same Vo when RL = 4ΚΩ. How i can find the relevants u0 when RL=2 and 4 ΚΩ?

  20. ammanjordan
    • 3 years ago
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    Hi guys, can i have some method to find vo for RL= 2 and 4 ΚΩ. thanks.

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