complementary small-signal mosfets?

bogdan_borko · 16th April 2006, 12:10 PM

Anyone knows any complementary small-signal mosfets?
Is there 2N7000/7001 or BS170 complemetary?

jcx · 16th April 2006, 03:51 PM

no mosfets are truely complementary, differing conductivity of N vs P doped Si gives different area (= parasitic C) for similar conductivity or different gm, Ron for same geometry

bjts differ too but Vbe, gm are more alike between pnp/npn

in mosfets threshold V variations and the larger Cgs,gd effects make "complementary" designs less useful in distortion cancellation compared to the fairly useful complementary bjt Vbe even order cancellation

Zetex has a few small signal mosfets - some are Supertex second sources

consider using the sot-223 package for a little more power - still big enough to hand prototype with and soldering a Cu flag on the tab can get you up 2 W

ilimzn · 16th April 2006, 09:04 PM

IRFD9110 and IRFD120 come close if I remember right...
2N7000/7001 and BS107/170 have no direct complements.
Zetex makes a few 'complements' ZVN/ZVPxxxx.

16th April 2006, 12:10 PM	#1
bogdan_borko diyAudio Member Join Date: Nov 2005 Location: serbia, zajecar	complementary small-signal mosfets? Anyone knows any complementary small-signal mosfets? Is there 2N7000/7001 or BS170 complemetary?

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16th April 2006, 03:51 PM	#2
jcx diyAudio Member Join Date: Feb 2003 Location: ..	no mosfets are truely complementary, differing conductivity of N vs P doped Si gives different area (= parasitic C) for similar conductivity or different gm, Ron for same geometry bjts differ too but Vbe, gm are more alike between pnp/npn in mosfets threshold V variations and the larger Cgs,gd effects make "complementary" designs less useful in distortion cancellation compared to the fairly useful complementary bjt Vbe even order cancellation Zetex has a few small signal mosfets - some are Supertex second sources consider using the sot-223 package for a little more power - still big enough to hand prototype with and soldering a Cu flag on the tab can get you up 2 W

16th April 2006, 09:04 PM	#3
ilimzn diyAudio Member Join Date: Feb 2005 Location: Zagreb	IRFD9110 and IRFD120 come close if I remember right... 2N7000/7001 and BS107/170 have no direct complements. Zetex makes a few 'complements' ZVN/ZVPxxxx.

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