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Dual FET mixer.

S

Spehro Pefhany

Jan 1, 1970
0
Does any one have a part # and source to get a modern dual gate
RF mixer FET transistor? This would have to be a through hole or
an SOT or something close to that I could fit in.

wouldn't mind one that can operate up in the high end like 1 Ghz
or better.

This is just a curiosity question because I may have a need for one
as a replacement and also a few for a project idea.

I did a search for dual gate RF FETS and I don't seem to be able to
find much any where. At least where I looked, that is. I find lots of
Obsolete ones.

Jamie

I'm using NXP BF998s.. they're pretty cheap & available.


Best regards,
Spehro Pefhany
 
J

Jamie

Jan 1, 1970
0
Does any one have a part # and source to get a modern dual gate
RF mixer FET transistor? This would have to be a through hole or
an SOT or something close to that I could fit in.

wouldn't mind one that can operate up in the high end like 1 Ghz
or better.

This is just a curiosity question because I may have a need for one
as a replacement and also a few for a project idea.

I did a search for dual gate RF FETS and I don't seem to be able to
find much any where. At least where I looked, that is. I find lots of
Obsolete ones.

Jamie
 
S

Spehro Pefhany

Jan 1, 1970
0
I'm using NXP BF998s.. they're pretty cheap & available.
p.s. BF1102/BF909 is better for high frequencies.


Best regards,
Spehro Pefhany
 
J

Jamie

Jan 1, 1970
0
Spehro said:
I'm using NXP BF998s.. they're pretty cheap & available.


Best regards,
Spehro Pefhany
yes, I can make those work.. And mouser has them. Thanks..

they are cheap, too! :)


Jamie
 
J

Jamie

Jan 1, 1970
0
Dave said:
NXP still has dual-gate FETs - BF992, BF991, BF994, and a whole bunch
of others, in a SOT143 format. Digi-Key stocks a bunch of them...
just search the phrase "dual gate" in their product finder and then
select "RF FETs" as the category.

They seem to be spec'ed out for gain-controlled amplification
applications but I imagine you could probably use them as mixers.
Yes, I have just looked at those. I need to look at the spec for a
3Sk45B to see if they will sub for that. As for a project that is
kicking in my head, I can make those work as they are.

Thanks.
Jamie
 
J

Jamie

Jan 1, 1970
0
Jan said:
I second that.

I am going to get some and test them, I noticed they have a internal
diode clamp from the gates to the source. Most likely won't cause a
problem but nice to know before I waste time.

jamie
 
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