Is there such a thing as an opto mosfet?

[Rich Grise]

Is there such a thing as an opto mosfet?

I was just thinking about gain feedback that's DC isolated - is
there SATAAOM? ;-)

In my mental imagination's movie screen, I see something like
the old incandescent/CDS gain controls. HP used just the filament,
but that was to stabilize the gain - essentially, I want to amplitude
modulate a resonant oscillator.

Long-tailed pair in push-pull with a variable current source?

Thanks!
Rich

 

[John Fields]

Is there such a thing as an opto mosfet?

I was just thinking about gain feedback that's DC isolated - is
there SATAAOM? ;-)

 

[Winfield]

Is there such a thing as an opto mosfet?

I was just thinking about gain feedback that's DC isolated - is
there SATAAOM? ;-)
SATAAOM?

In my mental imagination's movie screen, I see something like
the old incandescent/CDS gain controls. HP used just the filament,
but that was to stabilize the gain - essentially, I want to
amplitude modulate a resonant oscillator.

Ahh, why DC isolated? How about the JFET gain trick in AoE.

Long-tailed pair in push-pull with a variable current source?

Yep, not a bad idea. Look up amplitude-controlled marginal
oscillator, see if there's anything out there on that. In
the meantime I can send you some papers and drawings of its
use in NMRs and other types of Q-sensing LC oscillators.

 

[D from BC]

Is there such a thing as an opto mosfet?

I was just thinking about gain feedback that's DC isolated - is
there SATAAOM? ;-)

In my mental imagination's movie screen, I see something like
the old incandescent/CDS gain controls. HP used just the filament,
but that was to stabilize the gain - essentially, I want to amplitude
modulate a resonant oscillator.

Long-tailed pair in push-pull with a variable current source?

Thanks!
Rich

VCA IC.


D from BC

 

[Jamie]

Is there such a thing as an opto mosfet?

I was just thinking about gain feedback that's DC isolated - is
there SATAAOM? ;-)

In my mental imagination's movie screen, I see something like
the old incandescent/CDS gain controls. HP used just the filament,
but that was to stabilize the gain - essentially, I want to amplitude
modulate a resonant oscillator.

Long-tailed pair in push-pull with a variable current source?

Thanks!
Rich

YEs.

 

[Rich Grise]

SATAAOM?

Such a thing as an opto mosfet.

Ahh, why DC isolated? How about the JFET gain trick in AoE.

Well, I don't actually know if it's supposed to be DC isolated or
not - this client hasn't told me much about the project yet, but
I want to hit the ground running when he does. Clearly, if it
doesn't have to be isolated, then it's pretty simple.

And, yes, I'm gonna have to pick up a copy of AoE for my very own. ;-)

Yep, not a bad idea. Look up amplitude-controlled marginal
oscillator, see if there's anything out there on that. In
the meantime I can send you some papers and drawings of its
use in NMRs and other types of Q-sensing LC oscillators.

Cool!

Thanks!
Rich