[time-nuts] What is the best way to multiply a 10 Mhz
magnus at rubidium.dyndns.org
Sun Jan 30 07:27:18 UTC 2011
On 22/12/10 15:55, Richard (Rick) Karlquist wrote:
> On 12/21/2010 10:11 PM, Bernd Neubig wrote:
>> Hi Rick,
>> I have a problem to imagine how you connect the LO and RF port of a
>> mixer in
>> series and drive it (the IF port?) with a ... sine wave.
>> Can you send me a sketch of this arrangement please?
>> Tnx a lot!
>> Best regards
>> Bernd Neubig DK1AG
> Good question. I am posting this in case others were confused.
> On the ASK-1, pins 2, 3 and 6 are NOT internally connected.
> This is confusing because the data sheet denotes them all as "Ground".
> I forgot to mention this because it is intuitive to me.
> There is a statement to this effect somewhere in an ap note.
There are many mixers which the datasheet makes you beleive that the
"ground" pins is internally connected while they in fact are not. In
fact, the way they are actually built it would complicate things with no
apparent gain. Using the ports floating is much more useful.
> The netlist is as follows:
> 10 MHz to pin 1 of inductor
> Pin 2 of inductor to pin 1 of capacitor
> Pin 2 of capacitor to pin 1 of ASK-1
> Pin 3 of ASK-1 to Pin 4 of ASK-1
> Pins 6 of ASK-1 to ground
> The X2 output comes from pins 4 and 5 (the "IF").
> Usually you would connect pin 5 to the same ground
> as pin 6, but you could also take the output differentially
> (IE floating).
> The capacitor and inductor resonate at 10 MHz, the loaded
> Q is around 4. The drive impedance of the ASK-1 as indicated
> is around 30 ohms IIRC. Of course, many other mixer models
> can be used, as long as they have both sides of the LO port
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