As above. Another question please: what do you call the "purpose/arrangement" (unsure of the proper terminology) of these JFETs in the circuit?
sample Schematic:
NOTES:
sample Schematic:
NOTES:
- The unidentified opamp to the left of the OP27 is the bigger circuit above it.
- The dual JFETs will be subsituted with 2x of their single counterparts.
Using doubles means both come from same die, were subject to exact same processes, etc. , so by definition they are "born" matched, or at least incredibly close.
Separates? .... not so much.
Separates? .... not so much.
Stability issues, signal headroom, lower degeneration (large open loop gain), to name some.
Just explained today to my trainee at my work the strategy of matching j-fets: same Idss, Upo or transfer function (S)?
It's a scattered field of parts to choose from. All choices are less ideal for various reasons. The trade off of same die semi's is the risk of a higher noise floor, but manageable.
Just explained today to my trainee at my work the strategy of matching j-fets: same Idss, Upo or transfer function (S)?
It's a scattered field of parts to choose from. All choices are less ideal for various reasons. The trade off of same die semi's is the risk of a higher noise floor, but manageable.