Thanks for replying. But for low frequencies we need low gm. Gm with feedback means feedback should be an internal feedback. I am using source degeneration which also produces negative feedback.
You can decrease Flicker with the increasing of the area! Length is not enough, because it decreases the gm of diff.pair. Degeneration also decreases, and feedback doesn't reduce the input referred noise, read about it in Razavi's book.I have tried increasing the length for low flicker noise. I have also used PMOS differential pairs but still noise is quite high.
If you voltage gain is below 1 it means only that your circuit does not work at all. Check DC operating points. Show us your testbench too.
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