comparator for sigma delta ADC

[sandhaajith]

i designed a comparator for a sigma delta ADC and it is working fine.But i need to give the output to a latch through an inverter.after connecting a D latch to one of the outputs, the output changes.If latch is connected to both outputs, the circuit works fine.Can anyone help

 

[JPR]

It is difficult to tell from your description, but I would guess that there is a load influence on the comparator, or more specifically an influence of mismatch of the load. This can be often found in a latch type comparator. If your comparator is this sensitive to mismatch in load, it must be either redesigned, or you must be very very careful in layout. There also may be a large influence on component matching if you see this much load influence, so be careful of this too.

 

[sandhaajith]

Thanks.