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'[EE] Mixers'
2007\03\09@185324 by

I've been reading in EMRFD and the ARRL Handbook.  I've seen
mixers(gilbert cell and diode ring) used for a whole bunch of things.
Does anyone know of a good article that covers the ways we can use
these?

--
Paul Anderson
VE3HOP
wackyvorlongmail.com
http://www.oldschoolhacker.com
"May the electromotive force be with you."

> I've been reading in EMRFD and the ARRL Handbook.  I've seen
> mixers(gilbert cell and diode ring) used for a whole bunch of things.
> Does anyone know of a good article that covers the ways we can use
> these?
>
> --
> Paul Anderson
>

Well, I dunno about a good article, but they are interesting devices. I
look at them as analog multipliers. When one sine wave is multiplied by
another of another frequency, the result is the sum of two sine waves, one
at the sum of the two frequencies, the other at the difference. You can
use trig sum and difference formulae to derive this.  You can also use a
mixer, balanced modulator, or analog multiplier to generate double
sideband suppressed carrier AM and AM with carrier (add a DC offset). You
can also use them as a phase detector since multiplying two in-phase
signals gives a DC value of 1 and two signals 90 degrees out of phase
gives 0. You can also combine two DSBSC signals with the carriers shifted
90 degrees and the audio shifted 90 degrees to generate single sideband
AM. Or you can independently drive the two non-carrier inputs to generate
quadrature amplitude modulation. You can also use an analog multiplier to
demodulate all of these things.

Pretty amazing trigonometry!

Harold

--
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On 3/9/07, Paul Anderson <wackyvorlongmail.com> wrote:
> I've been reading in EMRFD and the ARRL Handbook.  I've seen
> mixers(gilbert cell and diode ring) used for a whole bunch of things.

Gilbert cell could be a nasty stuff. It has some major limitations in
the amplitude of the input signals, exceding the limits are producing
distorsions on mixed signals.
The second problem of all mixers is the existence of the sum and
difference between the signal and LO at the output, and sometime
filters does not help enough.

members.tripod.com/michaelgellis/gilbert.html
http://rcaverly.ee.vill.edu/cmosrf/gilbert.htm

> Does anyone know of a good article that covers the ways we can use
> these?

http://www.intersil.com/data/an/an9744.pdf

serach here for datasheets and application notes:
http://www.digikey.com/scripts/DkSearch/dksus.dll?Criteria?Ref=11422&Site=US&Cat=33489969

Vasile
an old AD, digital, mixed, and RF design engineer

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