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From: Jan Panteltje <alien@comet.invalid>
Newsgroups: sci.electronics.design
Subject: Re: "Sampler??"
Date: Tue, 30 Jul 2024 10:36:51 GMT
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On a sunny day (Tue, 30 Jul 2024 08:58:35 -0000 (UTC)) it happened Cursitor
Doom <cd999666@notformail.com> wrote in <v8a9vr$v9r2$1@dont-email.me>:

>On Tue, 30 Jul 2024 05:16:24 GMT, Jan Panteltje wrote:
>
>> On a sunny day (Mon, 29 Jul 2024 09:29:04 -0700) it happened john larkin
>> <jlarkin_highland_tech> wrote in
>> <72gfajl8ke966lsu54bpajpang9dvgmt63@4ax.com>:
>> 
>>>On Mon, 29 Jul 2024 05:19:06 GMT, Jan Panteltje <alien@comet.invalid>
>>>wrote:
>>>
>>>>On a sunny day (Sun, 28 Jul 2024 21:40:41 -0000 (UTC)) it happened
>>>>Cursitor Doom <cd999666@notformail.com> wrote in
>>>><v86dsp$3n74$1@dont-email.me>:
>>>>
>>>>
>>>>>I still can't see where the 'sampling' bit comes into it.
>>>>>AFAICT, there's are two signals into this thing and one signal out.
>>>>>The signal from the LHS is passed through a very fast diode which
>>>>>generates harmonics from that fundamental. The signal from the RHS is
>>>>>unmodified and mixed with the desired harmonic to give the necessary
>>>>>output signal which is then filtered to get rid of the unwanted mixing
>>>>>products. If that's all correct, as I believe it is, where does any
>>>>>*sampling* come into it?
>>>>
>>>>A 'sampler' is fact a non-linear mixer.
>>>
>>>In the audio world, a "mixer" is a linear summer.
>>>
>>>In RF, a mixer is usually a multiplier, typically a 4-quadrant diode
>>>thing or a Gilbert cell type circuit. Or a 2-quadrant thing like a
>>>pentode. Or even a single diode. All do some flavor of multiplying.
>>>
>>>Some mixers inherently multiply a signal by a square wave, which
>>>resembles other multiplier-type things once you lowpass filter the
>>>output. That's a "synchronous detector", which we usually do in an FPGA.
>>>
>>>A sampler is a signal multiplier too.
>>>
>>>These are all variations on the basic idea of multiplying two signals.
>> 
>> A the word 'mixer' in RF is not the same as a multiplier,, 
>> Multipliers are like harmonic generating stages say you have a 1 MHz
>> distorted sine wave and then a second stage tuned at 3 MHz,.. turned to
>> third harmonic.
>> 
>> mamamatical speaking RF mixing is indeed multiplication.
>> 
>> Like Shakepierce once said:
>>  "What's in a name..." CocaCola wihout coke
>
>I think in this context, HP is using the term "sampler" to mean something 
>which 'sniffs' a small amount of a signal for testing purposes. Like a few 
>turns of wire around a transmission line will 'sniff' a small sample of 
>what's going on in the line.
>Where I went wrong was rigidly thinking HP meant 'sampling' in the manner 
>a sampling oscilloscope works. That's what threw me. I tend to interpret 
>things very literally. :(

Would be nice to see a real circuit diagram of that thing.
What is the model / type number?
I am curious.
So far I have been able to find circuits for most stuff I came across with google.