Post by thread:[EE] Mixers

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 spam_OUTwackyvorlonTakeThisOuTgmail.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 -- FCC Rules Updated Daily at http://www.hallikainen.com - Advertising opportunities available!

On 3/9/07, Paul Anderson <.....wackyvorlonKILLspam@spam@gmail.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