# Switching Mixers for LO frequency= 4.25Ghz

I want to upconvert a square pulse of 250 Mhz bandwidth(250Mhz is the value of the first zero of the sinc ) to a center frequency of 4.25 Ghz , so that the spread becomes from 4Ghz to 4.5 Ghz.

Effectively, the output I want is $sin(2 \pi \cdot 4.25 \cdot 10^9 t) * Pulse$.

Previously it has been done with a switching mixer HMC128 . From my understanding of switching mixer, it basically either allows the signal to pass as it is or blocks it depending on the phase of the Local Oscillator.

The problem is that the above IC is not available on any of the sites like Digikey etc that ship to India. Can any one suggest some other mixer? Also can anyone explain exactly how the switching mixer gives the output I desire? Is there some sort of filter to remove the multiplication of the harmonics of 4.25Ghz?

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When you say the part is "not available", what precisely do you mean? Hittite shows it on their website, and does not show it as "discontinued" or "obsolete" or anything like that. –  John R. Strohm Feb 1 '12 at 1:31
I am unable to find a way to order 2-3 pieces that I need directly from Hittite to be delivered to India and sites like Digikey do not have it. Hence a substitute required. –  gururaj Feb 1 '12 at 8:55
@gururaj: If you are a university student, and this is for a student project, email the company, explain that you are a student, and you need two or three for a school project. If you are not a student, the thing to do is email them and explain, POLITELY, that you need a small quantity of these units for prototype development. –  John R. Strohm Feb 1 '12 at 22:02
If you want to request samples, you might have more luck contacting Hittite's local sales rep, which is apparently Syratron (syratron.com). They might also be able to refer you to a local distributor. –  The Photon Feb 2 '12 at 3:02
The lowest RF,LO f is 1.8GHz for this mixer. You might want to start looking for differently specced mixer but of the same type (switched). Still with mix of pulse video and GHz carrier the idea of using switching mixer looks valid –  user924 May 28 '12 at 16:16

THese devices are not stocked as they tend not to be in high demand. The factory also does not keep stock. So MOQ = 10 * $23.11 or so.=$231 + tax etc.