Did you mean Analog Devices? Specifically the AD8333? Looks very
interesting:
www.analog.com/en/subCat/0,2879,770_849_0__0_,00.html
Artie Lekstutis
KC2MFS
>
> Cecil
>
> What is the part number for the AMD device?
>
> Tom
> W2TER
>
>
> ----- Original Message -----
> From: [EMAIL PROTECTED]
> To: [email protected]
> Cc: [EMAIL PROTECTED]
> Sent: Thursday, September 14, 2006 12:38 AM
> Subject: Re: [soft_radio] Re: New file uploaded to soft_radio
>
>
> Cecil
>
> Ok this is somewhat encouraging, I must take stock of what looks
like
> might stop being manufacured in the future. SMT is ok, I have
found
> some neat little boards called Surf Boards that can come in handy
when
> with SMT and the breadboard. In turn chips mounted on them can
then be
> treated like a DIP IC in terms of ease of use in a finished
board.
> Folk might like such chips premounted and someone can make a few
sales
> with them that way.
>
> Dan
>
> "Dual gate FETs should work just fine, back some time they were
> considered the cat's meow since they worked so well, they could
handle
> large signals without distortion (high IP3) especially when used
in a
> balanced circuit. While being a mixer they can also provide gain.
>
> They are a little hard to get since very few are made anymore,
they were
> excellent for a receivers RF/IF amplifier since changing the bias
on the
> second gate could be used to control the gain of the device, and
are by
> nature very low noise devices.
>
> Their big gotcha is that they are incredibly sensitive to static,
so are
> easily damaged, I would solder them in place before removing the
little
> wire that was wrapped around the pins
>
> The SA612A will also work fine also as long as you stay within
the chips
> input level. By they way I read that they no longer manufacture
the DIP
> package versions, they now only make the SMT version so enjoy
them while
> you can, I have about 20 in stock, they are handy little devices.
>
> AMD makes a much better version that sports two mixers and a
built in
> Quadrature clock generator. You feed it a clock at 2X the receiver
> frequency, and it generates the Quadrature clocks for the mixers
inside,
> it also has a much higher IP3 figures of +19dB, it cost around
$4.00,
> it's available in SMT only.
>
> Under 20M I prefer switches, but any kind of mixer will work,
just some
> better than others. Here is a schematic of a receiver with I/Q
audio but
> uses a Diode Balanced Mixer, there are all kinds of possibilities
out
> there;
>
> < http://www.hpsdr.com/Public/Parts/Clock/TMschematic.pdf>
>
> Too much fun and not enough time." ....Cecil KD5NWA
>
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>
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