Engineering Is the Simulation Accurate? Analyzing an Op Amp Circuit with Multisim

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SUMMARY

The forum discussion centers on the accuracy of a simulation of an operational amplifier (op amp) circuit using Multisim. The user calculated the currents ia, ib, ic, ig, and is analytically as -470 µA, 770 µA, 22 µA, 322 µA, and 64.5 µA, respectively, with specific resistor values Ra=1kΩ, Rb=2kΩ, Rc=1.5kΩ, and Rf=210kΩ, resulting in a Vo of 14.5V. However, discrepancies were noted between the analytical results and the simulation outputs in Multisim. The user provided detailed equations for their calculations, confirming the values obtained through analysis.

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Saeed.z
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hi everyone ,

i solved a textbook question which says :

http://img268.imageshack.us/img268/8994/img1379sa.jpg

http://img685.imageshack.us/img685/3228/img1380z.jpg

and found analytically : ia = -470 uA, ib = 770 uA , ic = 22 uA, ig= 322 uA, is = 64.5 uA

Ra= 1kohms, Rb=2kohms, Rc = 1.5 kohms, Rf= 210 kohms , Vo = 14.5 v

and i simulate it by using multisim as shown below :

http://img32.imageshack.us/img32/8847/simue.png

the current (Is) looks different ! is there something wrong with simulation ? thanks : )
 
Last edited by a moderator:
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Please show your equations for the results you got.
 
ok ^^

Here is my solution :

http://img526.imageshack.us/img526/3480/ee1c.jpg

http://img444.imageshack.us/img444/1305/ee2f.jpg

hope it's clear :) thanks
 
Last edited by a moderator:
=> Vn = 29/30 v and Vo = 14.5 v

=> I s = ( Vn - 0 ) / 15k = 64.44 uA

I a = ( Va - Vp ) / 1k = -466.67 uA

I b = (Vb - Vp ) / 2k = 766.67 uA

I c = ( Vc - Vp ) / 1.5k = 22.2 uA

I g = ( Vp - 0 ) / 3k = 322.2 uA
 
Last edited:
any help ? thanks
 
i got it ! thanks :)
 

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