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mitxstudent
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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
 2 years ago
 2 years ago
mitxstudent Group Title
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
 2 years ago
 2 years ago

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morpheous87 Group TitleBest ResponseYou've already chosen the best response.3
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
 2 years ago

mitxstudent Group TitleBest ResponseYou've already chosen the best response.0
how do i work out rd sorry
 2 years ago

nick67 Group TitleBest ResponseYou've already chosen the best response.0
did you check here: http://openstudy.com/study#/updates/5062c622e4b0da5168bd6c57 it's quite similar
 2 years ago

mitxstudent Group TitleBest ResponseYou've already chosen the best response.0
i did but there wasnt a visible formula i could use
 2 years ago

morpheous87 Group TitleBest ResponseYou've already chosen the best response.3
RD should be 1, value taken from the graphic. Did my answers were correct?
 2 years ago

nick67 Group TitleBest ResponseYou've already chosen the best response.0
noise value is: vo = vi*Rz/(Rz+Rin), where Rz is 1 Ohm
 2 years ago

mitxstudent Group TitleBest ResponseYou've already chosen the best response.0
0.000055 was right for 4k but not 2k
 2 years ago

nick67 Group TitleBest ResponseYou've already chosen the best response.0
the noise output with zener is quite not dependent by the load
 2 years ago

nick67 Group TitleBest ResponseYou've already chosen the best response.0
as far as the Rload is much higher than Zener resistance, load contribution to vo calculation is negligible
 2 years ago

morpheous87 Group TitleBest ResponseYou've already chosen the best response.3
hmmm it should be almost the same, try close values :0.000054, 0.000056 should be fine
 2 years ago

mitxstudent Group TitleBest ResponseYou've already chosen the best response.0
iv attached a print screen so you can see if i have done summit wrong
 2 years ago

nick67 Group TitleBest ResponseYou've already chosen the best response.0
I was talking about values with Zener in
 2 years ago

nick67 Group TitleBest ResponseYou've already chosen the best response.0
with RL 2K vo about 54.92 uV, with RL 4K vo about 54.93 uV
 2 years ago

morpheous87 Group TitleBest ResponseYou've already chosen the best response.3
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?
 2 years ago

mitxstudent Group TitleBest ResponseYou've already chosen the best response.0
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
 2 years ago

nick67 Group TitleBest ResponseYou've already chosen the best response.0
without Zener, vo is 36.67 mV for RL = 2k and 44 mV for RL = 4K
 2 years ago

morpheous87 Group TitleBest ResponseYou've already chosen the best response.3
The formula for RL is : Vin*RL/(RL+Rin)>=5V
 2 years ago

morpheous87 Group TitleBest ResponseYou've already chosen the best response.3
Try 580590 value, ok?
 2 years ago

mitxstudent Group TitleBest ResponseYou've already chosen the best response.0
thank you for the help mate best respone and this has probably helped alot of others that have been stuck on this one
 2 years ago

morpheous87 Group TitleBest ResponseYou've already chosen the best response.3
so it's everything ok now?
 2 years ago

wuzupdawg Group TitleBest ResponseYou've already chosen the best response.0
uhhhh how did you find V0 (capital V)
 2 years ago

morpheous87 Group TitleBest ResponseYou've already chosen the best response.3
Try this if you are asking about the first part  VO=VI*RL/(RL+RIN) If not give more info what you need.
 2 years ago
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