Hi,
I was messing around in SPICE and think I solved the PSRR problem with a white cathode follower using depletion-mode MOSFETs. I appear to have given it a 26dB improvement.
Is it elegant or another lame-o dud?
The top jfet gets the current sense relative to the supply and send it to the bottom one that inverts and adjusts for matching swings.
I was messing around in SPICE and think I solved the PSRR problem with a white cathode follower using depletion-mode MOSFETs. I appear to have given it a 26dB improvement.
Is it elegant or another lame-o dud?
The top jfet gets the current sense relative to the supply and send it to the bottom one that inverts and adjusts for matching swings.
Here's a slightly different one that can bring a 25 ohm Denon AH-D2000 to its full 1.8 watts.
I changed the VAS p-device to a Supertex VP0550 which allows the I-to-V resistor to be larger as the D-MOS turn-on is much higher. This gives much more open-loop gain. Each output device dissipates just 900mW at full load or 1.3W at idle.
I changed the VAS p-device to a Supertex VP0550 which allows the I-to-V resistor to be larger as the D-MOS turn-on is much higher. This gives much more open-loop gain. Each output device dissipates just 900mW at full load or 1.3W at idle.
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Those are enhancement mode. I guess you could do white cathode follower with them, but it won't self-bias
triodes are like self fb, plate is signal out, but at same time could be used as fb input.
when triode is working into opt, that´s easy.
how to make it work in other schemas..quite hard
when triode is working into opt, that´s easy.
how to make it work in other schemas..quite hard
Interesting.. A small change to get the bottom biased, and this might just work.
Possibly not tempco stable, though.
Possibly not tempco stable, though.
Ooops, Semelabs... sorry.. The spice I did for the Semisouth power SiC JFETs. I was wondering why you asked about.. give me a few moments. a BUZ900, okay?
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