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Old 23rd October 2009, 02:28 PM   #1
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Default Spice simulation of balanced circuit

I'm trying to simulate a balanced opamp circuit in Tina.

Now this might sound like a stupid question but...

Should I provide the voltage source with a reference to gnd like this..

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Or without gnd reference like this...

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Any advice is much appreciated.

Thanks.
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Old 23rd October 2009, 02:42 PM   #2
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Hi Tony

I知 not familiar with TINA, I知 using PSpice, but what I do when I知 simulating a balanced circuit is that I use 2 voltage sources, both connected to ground, and have one of them 180 degrees out of phase. You put ス the voltage in each of them.

Cheers
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Old 23rd October 2009, 03:00 PM   #3
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Number 2 is correct. The + input is referenced to ground through R5.
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Old 23rd October 2009, 03:05 PM   #4
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Quote:
Originally Posted by stinius View Post
Hi Tony

I知 not familiar with TINA, I知 using PSpice, but what I do when I知 simulating a balanced circuit is that I use 2 voltage sources, both connected to ground, and have one of them 180 degrees out of phase. You put ス the voltage in each of them.

Cheers
Hi Stinius, I tried that, unfortunately Tina gives an error message "Only one input is allowed".

Thanks for the suggestion though!
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Old 23rd October 2009, 03:06 PM   #5
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Quote:
Originally Posted by Frank Berry View Post
Number 2 is correct. The + input is referenced to ground through R5.
Hi Frank, surely you meant the + input is referenced to gnd through R4 and not R5? (which doesn't exist!)

Thanks,
Tony.
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Old 23rd October 2009, 10:58 PM   #6
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The input source don't need referenced to ground at my simulations of bal. circuits in "circuitmaker". But the output load need this one. So I must use number 2 of your schematic. I think, at your software it must be the same behaivour. If you see error messages nevertheless, please try to sketch leads between all points of GND and remove the earth symbols except one pieces.
By simulate of a circlotron topology (output also balanced) I must still differentiate between an real GND and GND only for simulate at the negative output

Last edited by tiefbassuebertr; 23rd October 2009 at 11:02 PM.
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Old 30th October 2009, 08:14 AM   #7
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This is how I do it for a quick check. This circuit is for a high CMRR differential amp with both a differential input and a common-mode input.
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File Type: jpg DIFFERENTIAL AMPLIFIER HIGH PERFORMANCE.JPG (45.6 KB, 125 views)
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Old 30th October 2009, 08:17 AM   #8
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Of course, for the Bose plots, you need to remove and short-circuit the ac voltage source that is not needed for the plot, as only one ac signal source can be used when performing gain/phase analysis.
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