hannover90
Member level 4
Hello all,
with helping of replys to my last thread, I designed a fully differential amplifier with a gain "G", but i can not understand the gain of the whole circuit with a signal-feedback, as showed in the attached figure.
The gain of the whole circuit, I calculated as: A=Rx/Ry for example A=1000KΩ/500kΩ=2, but how is the role of the gain "G" of the fully differential amplifier, which should be high as possible?
Now, i try to check the stability of the designed FDA using cmcdprobe from analogLib, as seen in the attached figure.
Does the AC simulated gain (called in cadance as loop gain) indicate "A" or "G"?
The transient simulated output signals of my DFA for different A=1, A=2, A=3, have a little swing (please, see the attachment ).
Is the DFA instabil?
I would be thankful for any reply.
with helping of replys to my last thread, I designed a fully differential amplifier with a gain "G", but i can not understand the gain of the whole circuit with a signal-feedback, as showed in the attached figure.
The gain of the whole circuit, I calculated as: A=Rx/Ry for example A=1000KΩ/500kΩ=2, but how is the role of the gain "G" of the fully differential amplifier, which should be high as possible?
Now, i try to check the stability of the designed FDA using cmcdprobe from analogLib, as seen in the attached figure.
Does the AC simulated gain (called in cadance as loop gain) indicate "A" or "G"?
The transient simulated output signals of my DFA for different A=1, A=2, A=3, have a little swing (please, see the attachment ).
Is the DFA instabil?
I would be thankful for any reply.
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