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The definition of differential output swing

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diego.fan

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Hi, all, in Razavi's book, there is a question. I don't understand the red part.

In my opinion, Vmax=Vdd-|Vod7|-|Vod5|, Vmin=Vod3+Vod1+Vod9
Vmax-Vmin=Vdd-|Vod7|-|Vod5|-Vod3-Vod1-Vod9
This cannot be 3V. Otherwise |Vod7|+|Vod5|+Vod3+Vod1+Vod9=0, which is impossible.

I also check this question https://www.edaboard.com/showthread.php?t=266154
But I still don't know how to calculate differential output swing.

Thanks in advance.
 

View attachment 141340
I don't understand the red part.

In my opinion, Vmax=Vdd-|Vod7|-|Vod5|, Vmin=Vod3+Vod1+Vod9
Vmax-Vmin=Vdd-|Vod7|-|Vod5|-Vod3-Vod1-Vod9
This cannot be 3V. Otherwise |Vod7|+|Vod5|+Vod3+Vod1+Vod9=0, which is impossible.
No, this sum = 3V : The Solution text doesn't concern the output swing, but the partitioning of the total available voltage (3V) into the individual transistors' Vds of the branch. Here Vod=Vds_max.

The possible output swing then is the sum of (Vod - Vds_sat) for all transistors in the branch.
 

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