In the attachment, I've shown an outline circuit (biasing absent) in which the global feedback loop is made stable by C2. C2 then forms a feedback loop around the two JFETs. For the two JFETs, I was thinking of using the same type, with the higher Idss/Vcutoff one as the cascode.
With two very similar parts operating at the same current, would this arrangement be stable? If not, what could be done to stabilise this inner loop? Or, if two different JFET types were used, what properties should the cascode FET have relative to the common-source FET (what to look for in datasheets)?
Thanks,
Stephen
With two very similar parts operating at the same current, would this arrangement be stable? If not, what could be done to stabilise this inner loop? Or, if two different JFET types were used, what properties should the cascode FET have relative to the common-source FET (what to look for in datasheets)?
Thanks,
Stephen