neoflash
Community Fellow
Offline
Mixed-Signal Designer
Posts: 397
|
Usually you add a switch in series with the R/C will achieve the programming function.
The complexity is:
1. How big the switch it needs to be?
2. Which side should the switch sit?
3. How to deal with the disconnected terminal of R/C? Let it float or bias it somewhere?
These questions are related to detailed specifications of your filter. Those problems are quite fundamental thus not many paper/book will specifically talk deep about it. But they are truly important problem that engineers should not ignore.
|