I could not found symbol of AD622 in ORCAD 16.3 and spice model file of this amplifier is also not available. Anyone please help me with alternate of the same.
You might check if the AD620 is in the library. It has similar performance to the AD622, and will have the same symbol.
For your design, I would also recommend the AD8221. This part will give you better performance than the AD622 at a lower price.