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From: john@Neopha.44in88.net (John Todd)
Subject: Re: How does a mixer work?
Date: 17 Oct 2002 15:47:29 GMT
References: <email@example.com> <firstname.lastname@example.org>
User-Agent: slrn/0.9.5.5 (UNIX)
On 17 Oct 2002 08:10:40 -0700, Asa Cannell wrote:
>Okay now I get the multiply part, where the LO is driven hard,
>multiply the RF/IF input by 1 or 0. But why do we need non-linear
>elements? I understand if you apply two signals to a linear element
>you just get to signals. But I dont see why a non linear element
>suddenly multiplies. Is there some analogy or other type of circuit
>that uses the non linear aspect of diodes in the same or similar way?
No. You appear to be reading an entry-level document.
Multiplication in this context refers to "frequency multiplication",
in which the subject signal is mixed with _itself_ to obtain
a similar signal at two or three times the original frequency.
In the days before PLL's, VHF signals were generated in this way,
with two or more multiplier stages.
I think of the mixing process this way: It is only when
the distortion due to the non-linear element is introduced,
that the sum and difference products of the interaction between
the two signals is of useful amplitude.
John E. Todd <> email@example.com
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