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Design question on Sampler Mixer

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Devil103

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Hello to all,

I'm looking for some references on designing a sampler based mixer (0 to 3 GHz).
Especially the pulse generator is giving me a headache since most references require a (expensive/rare) step recovery diode which I'm trying to avoid.

The general idea in my head at the moment is to use a fast switching varactor diode and drive a few transistor amplifiers into saturation to generate harmonics upward from the input frequency of preferably 1 MHz (perhaps from a crystal oscillator). If I can't generate 1 MHz harmonics upto 3 GHz I can still make this input frequency a discrete VCO with limited tuning range (5 MHz - 30 MHz).

Any thoughts on this?
 

you could use a gigabit logic inverter gate, capacitively couple the output to a short circuited transmission line. The gate provides a quick rise time, and the short circuited transmission line makes the pulse width narrow. Should work for a 3 Ghz mixer.
 

Might be a good option to investigate further, thanks.
Any specific component in mind for the inverter?

Perhaps on a side note, I'm new to ADS (MWO user before) and I'm wondering if I could use ADS' Harmonic Balance simulator for this. I still have to go through the HB manual though.
 

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