Depletion mode?

CBS240 · 4th October 2007, 02:27 AM

Hi

Does anyone happen to know if there exists a P-channel depletion mode mosfet? Preferably one similar to this one in characteristics... http://www.supertex.com/pdf/datasheets/DN3525.pdf or http://www.supertex.com/pdf/misc/d_m..._SG_device.pdf

Enhancement or depletion doesn't really matter, they would be used as a cascode in the VAS of a balanced bridge circuit (...attempt

). That is, they are used as a common gate amplifier. I have read that Trench type fets aren't good for audio, partly because of the input capacitance relation with Vds. I think from the data sheet the DN3525 would be a better part, or anything that is similar, but I can only find N-channel types, and of course at least rough complements are desired. Case style is completely open though since this circuit doesn't really exist yet.

Is there anyone who makes a P-channel depletion mode mosfet? Does such a thing even exist?

lucaigor · 4th October 2007, 08:52 PM

Have you checked the IXYS web site?
They are specilized in power semiconductor,
and if I'm not wrong they have P-channel mosfet (depletion).

4th October 2007, 02:27 AM	#1
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	Depletion mode? Hi Does anyone happen to know if there exists a P-channel depletion mode mosfet? Preferably one similar to this one in characteristics... http://www.supertex.com/pdf/datasheets/DN3525.pdf or http://www.supertex.com/pdf/misc/d_m..._SG_device.pdf Enhancement or depletion doesn't really matter, they would be used as a cascode in the VAS of a balanced bridge circuit (...attempt ). That is, they are used as a common gate amplifier. I have read that Trench type fets aren't good for audio, partly because of the input capacitance relation with Vds. I think from the data sheet the DN3525 would be a better part, or anything that is similar, but I can only find N-channel types, and of course at least rough complements are desired. Case style is completely open though since this circuit doesn't really exist yet. Is there anyone who makes a P-channel depletion mode mosfet? Does such a thing even exist? __________________ All the trouble I've ever been in started out as fun......

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4th October 2007, 08:52 PM	#2
lucaigor diyAudio Member Join Date: Aug 2007	Have you checked the IXYS web site? They are specilized in power semiconductor, and if I'm not wrong they have P-channel mosfet (depletion).

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