hi i got problem while connecting two block of sub circuit Output effected : is this problem due to symbol pin or schematic pin (i have taken iopin for Schematic and inout pin for sysmbol) thank you @Boris Murmann @Tim Edwards

Is xschem giving you an error message when generating the netlist? If so, what is the error message?

no

Then I do not understand the problem.

i am working on comparator circuit output of it connected to a logic sub circuit . output of comparator working fine while checking separately when i connected it with logic sub circuit output get affected @Tim Edwards

It is impossible to debug an issue for which the only description is "output gets affected".

Please show a schematic. I suspect you are loading the output of a latch comparator asymmetrically, which leads to an input referred offset. But it's really hard to tell from your description.

I'm suspicious of something much more fundamental, such as failing to specify the power supply in the digital components.

i connected one vdd to all other vdd with one same power supply . comparator : schematic logic block : schematic @Boris Murmann @Tim Edwards thank you

I don't see how the comparator is connected in your circuit. The left schematic is the comparator, the right schematic is some logic path with signals that I don't know.

using symbol i connected thank you

You are loading the comparator asymmetrically. Capacitive imbalance translates into a DC offset for a dynamic latch comparator. Read about it here: https://ieeexplore.ieee.org/document/4033159. You need at least one or two inverters of the same size connected to the latch on each side before you can branch out into random logic.

I am grateful for this suggestion. once again thank you @Boris Murmann.