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large input swing means that the input voltage limitation of keeping all the transistors opearated in saturation is decreased.
Added after 3 hours 46 minutes:
maybe,the amplifier is the load of some blocks. the output voltage of the block will be changed rather than constant.
if the amplifier has large input swing, the change of the output voltage of the block will has little influence on the amplifier, that is, all the transistors always operate in saturation region.
Hi
Dear friend, since SNR value for a noisy signal is proportional to the square of main signal (output swing), so to have higher SNR (consequently, higher Dynamic-range, or SNDR that requires for high resolution data converters).
therefore not to loss output swing, particularly in low-voltage applications, is very important in high-tech analog circuit design;
but noting, in most applications, the input of an opamp, for example, is virtual shorten, input swing is often not defined. but for general purpose designs since input of designed circuit has to able to operate with every CM input voltage, here Rail-to-rail designs are introduced with high input common-mode range (ICMR).
However, if you want to use e.g. an opamp in unity buffer config. then since the output and input have connected together, where input swing (ICMR) must be equal to (greater than) output swing!
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