anonymous
  • anonymous
This problem studies such effects and how a Zener diode may be used to ameliorate the problem. Assume that VI=13.5V, RIN=1 kΩ, and vi=55.0mV. how do i workout the value of vo
MIT 6.002 Circuits and Electronics, Spring 2007
schrodinger
  • schrodinger
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anonymous
  • anonymous
Hi, this worked for me - vo=vin/Rin *(RD*RL)/(RD+RL) so Try this values for both vo : 0.055/1000* (1*2000)/(2001) So for both RL 2k and 4k you should have ~ 0.000055
anonymous
  • anonymous
how do i work out rd sorry
nick67
  • nick67

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anonymous
  • anonymous
i did but there wasnt a visible formula i could use
anonymous
  • anonymous
RD should be 1, value taken from the graphic. Did my answers were correct?
nick67
  • nick67
noise value is: vo = vi*Rz/(Rz+Rin), where Rz is 1 Ohm
anonymous
  • anonymous
0.000055 was right for 4k but not 2k
nick67
  • nick67
the noise output with zener is quite not dependent by the load
nick67
  • nick67
as far as the Rload is much higher than Zener resistance, load contribution to vo calculation is negligible
anonymous
  • anonymous
hmmm it should be almost the same, try close values :0.000054, 0.000056 should be fine
anonymous
  • anonymous
iv attached a print screen so you can see if i have done summit wrong
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nick67
  • nick67
I was talking about values with Zener in
nick67
  • nick67
with RL 2K vo about 54.92 uV, with RL 4K vo about 54.93 uV
anonymous
  • anonymous
oooohh this is the first part, where there isn't zener. The formula is a bit different here. Try these values: for 2k - 0.037 and for 4k 0.044 is it ok?
anonymous
  • anonymous
yes you both are life savers i was stuck on this for the past 9 hours one last question is how do we work out the minimum rl
nick67
  • nick67
without Zener, vo is 36.67 mV for RL = 2k and 44 mV for RL = 4K
anonymous
  • anonymous
The formula for RL is : Vin*RL/(RL+Rin)>=5V
anonymous
  • anonymous
Try 580-590 value, ok?
anonymous
  • anonymous
thank you for the help mate best respone and this has probably helped alot of others that have been stuck on this one
anonymous
  • anonymous
so it's everything ok now?
anonymous
  • anonymous
uhhhh how did you find V0 (capital V)
anonymous
  • anonymous
Try this if you are asking about the first part - VO=VI*RL/(RL+RIN) If not give more info what you need.

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