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[Moved]Fully differential amplifier with CMFB

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gaurav5277

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can anybody help me understand this testbench. Screenshot from 2015-08-26 11:09:36.png
 

Hi,
Why and how is the second apmlifier ''acOpenDiff'' added?
I mean how do i use verilog A to do this?
Also please explain why is voltage sources at output of first amplifier added?
 

gaurav5277 said:
Why and how is the second apmlifier ''acOpenDiff'' added?
Click to expand...
1. To not load the output of the 1st amplifier additionally
2. To compensate for the DC-amplified offset

how is shown on the schematic.

gaurav5277 said:
Also please explain why is voltage sources at output of first amplifier added?
Click to expand...
I think this is a replacement for a CMFB circuit, to keep the DC output voltage at the cmref level.
 

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