18 August 2008, 4:56 pm
The question goes like this A) design an inverting amplifier with an input resistance of 20 kohms and a gain of negative ten (-10). B) Include a resistor to compensate for bias current C) Design a summing amplifier such that Vout = -(10*V1+2*V2+0.5*V3). So I think I have the design sort of. Down here is a link for part A and I think I have that right. http://s274.photobucket.com/albums/jj243/drod0886/?action=view¤t=summer.jpg What I don't get is part B. Where should I add the resistor to compensate for bias current? Also for the summing circuit, I know it should look something like this http://s274.photobucket.com/albums/jj243/drod0886/?action=view¤t=summer2.jpg But what resistor values should I use? I'm guessing that you do want any gain so the Rf resistor should be the same as your input resistor. But which would be your input resistor. And do you use a value that is 10 times lower than your feedback resistor to get a voltage 10 times the first one or use a value that is 2 times bigger than your feedback resistor to get .5 gain out of voltage 3? Some one please help... read more
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