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?