"ERROR -- Invalid Value"
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 2nd October 2008, 09:07 PM #1 spice freak   diyAudio Member   Join Date: Sep 2008 "ERROR -- Invalid Value" Hi, I am trying to do AC Sweep Analysis. Every time PSPICE gives me this error: "ERROR -- Invalid Value" What could be the reason? Thanks.
spice freak
diyAudio Member

Join Date: Sep 2008
Hi,

OK, I got it solved.

Now, the problem is I need some experimental starting values for my capacitors for the COMMON SOURCE amp.

Thanks.
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 6th October 2008, 11:56 PM #3 lineup   diyAudio Member     Join Date: Dec 2005 Location: the north C vs R-load gives the lower rolloff freq (-3dB) For such I use: uF x kOhm The higher this value ( C x RL ), the lower Rolloff Frequency My target value is at least 47 uFkOhm. This gives -3dB at 3.38 Hz For 100 kOhm load, I this means 0.47uF (470nF). Formula: -3dB frequency = 1/[ 2pi x C x R ] ... where 2pi = 6.28 uFkOhm value = Frequency -3dB 10 = 15.9 Hz 22 = 7.23 Hz 47 = 3.38 Hz 100 = 1.59 Hz (if you would use 1uF for 100 kOhm load. __________________ lineup
 7th October 2008, 12:09 AM #4 lineup   diyAudio Member     Join Date: Dec 2005 Location: the north To match C2 = 470 nF (47 uFkOhm) you will need make input cap C1 so that you get a value >= 47 uFkOhm Otherwise input rolloff will be limit of lower freq rolloff C1 sees: R1 // R2 (6k2 and 4k7) The combined load (=the input impedance) is: 1 [ (1/R1) + (1/R2) ] ... which give 2673 Ohm = 2k67 47/2.67 = 17.6 uF ... to give 47 uFkOhm So, C1 needs to be 18 uF or more, to match the output RC value __________________ lineup
 7th October 2008, 05:56 PM #5 spice freak   diyAudio Member   Join Date: Sep 2008 Thanks! it makes a lot more sense now. ...

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