Use ideal_balun.
https://designers-guide.org/analysis/diff.pdf
Use ideal_balun in AC analysis.Do you have a method please to simulate the differential input and common-mode input capacitance of the fully differential amplifier?
See https://www.edaboard.com/showthread.php?372399#10
Here I don’t use ideal_balun.
No.but you used skill for simulation,
I usually use the schematic
Yes, as far as you can understand diffential mode correctly.is the differentia output impedance of the fully differential amplifier
is twice the impedance taken from each output individually? (Rout_diff = 2 Rop=2Ron)
No.
It is based on schematic.
Yes, as far as you can understand diffential mode correctly.
Differential drive is different from floating drive.
No.
It is based on schematic.
Yes, as far as you can understand diffential mode correctly.
Differential drive is different from floating drive.
No, they are completely different.I presume both test benches are equivalent
Of course, you are wrong.unless if I am wrong
No, they are completely different.
Testbench using balun is correct.
However testbench using VCVS is wrong.
Of course, you are wrong.
Can you understand VCVS ?
It is unidirectional.
You can not see output of Amplifier from VCVS input.
Testbench using VCVS does not drive output of amplifier differentially.
It does drive output of amplifier as floating.
On the other hand, testbench using balun does drive output of amplifier differentially.
Observe postive and negative output nodes of amplifier in Transient Analysis.
You can see difference between differential and floating.
I don't think so.in Both cases I am getting an identical result and fit to the theoretical calculation.
Connect (2*RL)//(CL/2) to d node of balun.That means in the method 2 I am not using the full functionality of the balun in the correct short way, I think it should look like the image below (method 3)
Not necessary.I will later di a simulation for you to show how results from 1 and 2 are identical,
nevertheless I am leaving using VCVS toward balun.
Load of method1 is floating load not differential
Load. There is no common mode load.
So method1 is not equivalent to both method2 and method3.
If you ignore common mode,
RL=5kohm, CL=20pF in method2,
RL=10kohm, CL=10pF in method3.
See https://www.edaboard.com/showthread.php?352410
Not necessary.
Simply you are misunderstanding VCVS.
What do you want to mean by “same effect” ?to determince the equivalent load (same effect) of the fully differential from the single ended
What do you want to mean by “same effect” ?
If you mean an equivalency as signal processing, RL=5kohm, CL=20pF.
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