SJEP120R100
Ciss — 670pF
Coss — 103pF
Crss — 97pF
6x 2SK1058 parallel
Ciss — 3600pF
Coss — 2100pF
Crss — 60pF
But then if you have no Semisouth, maybe 6x matched 2SK1058 plus a Cascode is worth considering.
Good idea,
Patrick
Ciss — 670pF
Coss — 103pF
Crss — 97pF
6x 2SK1058 parallel
Ciss — 3600pF
Coss — 2100pF
Crss — 60pF
But then if you have no Semisouth, maybe 6x matched 2SK1058 plus a Cascode is worth considering.
Good idea,
Patrick
Weeell, but the SJEP data sheet gives the capacitances at Vds = 100V / Vgs = 0V, while 2SK1058 is quoted at Vds = 10V / Vgs = -5V. If you correlate the data based on the charts (at least for Ciss, there's no Coss / Crss chart in the 2SK1058 data sheet), you get:
SJEP120R100
Ciss = ~850pF
2SK1058
Ciss = ~330pF x 6 = 1,980 pF
Still a lot, but not 5.5x as much, "only" 2.5x. 😉 So perhaps 4 in parallel selected for the highest yfs would just about cut the mustard... (2SK286, with 1.4 typ / 2.5 max yfs and Ciss of ~400pF, could still be a cheaper / easier to find option.)
SJEP120R100
Ciss = ~850pF
2SK1058
Ciss = ~330pF x 6 = 1,980 pF
Still a lot, but not 5.5x as much, "only" 2.5x. 😉 So perhaps 4 in parallel selected for the highest yfs would just about cut the mustard... (2SK286, with 1.4 typ / 2.5 max yfs and Ciss of ~400pF, could still be a cheaper / easier to find option.)
Attachments
Can this silicon carbide power mosfet be a candidate?
https://www.mouser.it/datasheet/2/90/c2m0280120d-1795432.pdf
https://www.mouser.it/datasheet/2/90/c2m0280120d-1795432.pdf
F8 is innovative, an example of unmatched simplicity and efficiency-performance.
Let's broaden the view of this innovation by considering a classical power amp which has the familiar 3 stages. An input diff amp, followed by the last voltage amp and followed by complementary buffers. Let's do unto this classical amp what Mr. Pass did to J2.
Disable one semi from the the input diff amp, and return loop feedback to the source or emitter of the remaining semi in diff amp. Maybe easier written than done; but its an experiment!
Best
Anton
Let's broaden the view of this innovation by considering a classical power amp which has the familiar 3 stages. An input diff amp, followed by the last voltage amp and followed by complementary buffers. Let's do unto this classical amp what Mr. Pass did to J2.
Disable one semi from the the input diff amp, and return loop feedback to the source or emitter of the remaining semi in diff amp. Maybe easier written than done; but its an experiment!
Best
Anton
heavyhearted, I must admit - F8 is equal to (my beloved) M2 in sheer wit and elegance, and that even without Iron in signal path
go figure ........... nothing to Babelfish there
go figure ........... nothing to Babelfish there
