1. Increas the size of the devices to be matched
2. Use simmetric layout
3. Replicate the same geometry using series/parallel connection to achieve the wanted size.
I have a questions: What condition for the matching parameters Avt and Ak based on? Is it based on just two same structure spaced closed to each other (without interdigit), or stands Avt for interdigit or common-centroid one? For example, if datasheet say Avt = 1% um, will common-centroid layout improves this level of matching?