From: Jim Thompson
Subject: Re: How does a mixer work?
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Date: Thu, 17 Oct 2002 15:35:30 GMT
NNTP-Posting-Date: Thu, 17 Oct 2002 11:35:30 EDT
Organization: Cox Communications
On Thu, 17 Oct 2002 15:30:40 GMT,
Fred Bloggs ,
In Newsgroup: sci.electronics.design,
Entitled: "Re: How does a mixer work?",
Wrote the following:
|Kevin Aylward wrote:
|> "Asa Cannell" wrote in message
|>>How does a mixer work? I don't understand why it needs a non-linear
|>>element. I think examples of why a linear element (resistor) wont work
|>>would help illustrate why a non-linear element (diode) will. Also,
|>>what does 'mutiply' mean in terms of mixing? What if two DC signals
|>>are applied to a mixer, like 2V and 4V? Will the output be 8V?
|> The basic reason is based on a standard trigonometric result.
|> Sin(A)*Sin(B)= 0.5*(Cos(A-B) + cos(A+B))
|Huh? And which alternative reality is this?
Fred, Are you well ?:-) The equation is the classic trig showing that
the product of sines contains sum and difference frequencies.
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
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I love to cook with wine. Sometimes I even put it in the food.