Need a solution for comparator circuit

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The circuit issue arises when the output remains at 5V regardless of the input conditions, specifically when vN is set below 0.4V. Suggestions include simplifying the circuit by removing unnecessary components like XM8, 9, and 10 to isolate the problem. If the issue persists, increasing the VPbias may help. If these steps do not resolve the problem, further troubleshooting may be necessary. The discussion emphasizes the need for effective solutions in designing a comparator for an ADC circuit.
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I have problem with this circuit. Normally when vP>vN (if I set vN>0.4V), output vQ is equal 5v. But when I set vN < 0.4V, output is not true, it is always 5V not only for vP< vN but also vP>vN. I need to design ADC circuit, and that is comparator block. Need some suggestions. Help me
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Untitled_zpscwhwwz95.png

I supply V = 5V, vG = 0V, VPbias = 0V
 
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Start with eliminating all but the most basic things. This means removing XM8, 9 and 10. If it still does not work, try increasing VPbias. If it still does not work - I am currently out of ideas.
 
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