Hi all When an ideal opamp is added to the core cell of the square circuit in electric, the schematic is able to run properly. However, when i tried to draw the same circuit in LTspice (etc using same transistors size, same processes, same ideal op amp at output, same inputs), the output value obtained for both LTspice and electric varies. (The shape of graph is the same, however, the value of the output varies quit significantly, by about 4 times). I thought that Ltspice and Electric should generate same result. Anyone got any clue about what has happened? Thank You
Regards Weiyi On Mar 5, 10:01 pm, Jake Baker <[email protected]> wrote: > Would you post a schematic so it's easier to follow the question? I'll see > if I can comment, Jake. > > > > > > On Fri, Mar 5, 2010 at 1:25 AM, war_of_justice <[email protected]> wrote: > > Hi everyone > > > I am currently working on a square circuit and the circuits consists > > of current mirrors. The input voltage will result in a output square > > current function being obtained. However, At the output, there is one > > p and n mos transistors (one at top, one at bottom) and this 2 > > transistors are supposed to provide a sum current which will then be > > the output current ( output junction at the middle of the 2 > > transistors). However, it seems that for both LTspice and electric, > > there will be just one single current flowing through the transistors, > > making the current mirror to fail, may i know anyone has any method to > > solve this problem. For LTspice, I had tried to put an ideal inverting > > op amp at the output, the voltage across R1 (ideal op amp gain of R2/ > > R1=1) is set to 0 so that there will be a short circuit, causing > > current from n transistor and p transistor to flow directly across the > > op amp, this can help to solve the single current flow problem. > > However, for Electric, I do not have the processes or parameters for > > the transistors within the op amp, causing me to unable to use similar > > approach. May I know anyone has any better solution to solve this > > problem.Thank You very much > > > Regards > > Weiyi > > > -- > > You received this message because you are subscribed to the Google Groups > > "Electric VLSI Editor" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > > [email protected]<electricvlsi%2bunsubscr...@googlegroups.com> > > . > > For more options, visit this group at > >http://groups.google.com/group/electricvlsi?hl=en. > > --http://CMOSedu.com/jbaker/jbaker.htm- Hide quoted text - > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "Electric VLSI Editor" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/electricvlsi?hl=en.
