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questions about one type of latched comparator

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sendy

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Hello Guys,

I am a newer to comparator. I read some materials and I found one type of comparator which I could not understand. Attached is the schematic of the comparator which I could not understand.

In this circuit, I can understand how the track and latch work. But I could not understand what the transistor M2 and M3 are used for. It seems that these two transistors are always off during the simulation. The supply voltage I used for simulation is about 1V. And the differential inputs are about 400mV+-100mV.

Is there anyone who can explain this to me? Thanks in advance.


Sendy,
 

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  • comparator.jpg
    comparator.jpg
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M2, M3 represents regenerative amplifier during M5,M6 switching-on, accompanied by M8,M9 regenerative amplifier, and it provide full swing also. Comparator will work without M2, M3 also, but with less speed/sensitivity.
 
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