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I dont know where you got the second layout from but I've never seen it before. From an aesthetic point of view, I prefer the first one. The gradient are more evenly spread across the transistors in the first one than in the latter.
Re: gain-boosting
You'll also find that the exact value is somethin like gm2(1+A)ro1ro2 but since A>>1, that's the reason for the approximation to just (gm2)A
its just the normal cascode Rout, gm2ro2ro1 multiplied by the gain of M3, gm3ro3 and that's the overall Rout and the driving transistor is M1 so gain is -gm1(Rout). I believe it is inverted.
The minimum output swing is just the Vgs of M3 plus the VDSsat of M2
constant gm circuit
a) is the preferred circuit. Jacob Baker refers to it as the Beta Multiplier for biasing. you should check out cmos.edu for more info
Re: SR and 3dB BW question
slew rate is a large signal phenomena that deals with how quickly the output changes when there is a large change in the input, i.e. a step response. In order to increase SR, increase current.
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