Electronics > RF, Microwave, Ham Radio

Looking for cheap-ish generator (oscillator) module, 2.45 GHz, 10 W

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hanakp:
I'm participating in development of a portable instrument that needs to generate 2.45 GHz signal with 6 to 10 W output power. Basically, it will be a miniature microwave oven, so frequency stability, spectral purity etc. are not critical. The project leader wants me to design an oscillator based on Ampleon BLF2425M9L30 power LDMOS, but I'd rather to avoid it. I did some microstrip circuit design with Ansoft Designer (now Ansys Electronics Desktop) in the past, but it feels like over-engineering to me. Well, except when I tried searching for some off-the-shelf modules, I found nothing. Likewise, I found no published design that I could easily reuse. Do you happen to know some? The generator should preferably fit into 10x5x5 cm dimensions and cost under 500 USD. DC power input, 50 ohm RF output. It would be nice if the output RF power could be varied (our plan is to control LDMOS drain voltage), but we could just use attenuators if needed. Thanks!

LaserSteve:
GvA-84 mmic as a driver, and a 2.45 ghz VCO module as oscillator. Dither the VCO input voltage to find cavity resonance as needed on the load..

Skyworks and Minicircuits for driver MMICs and oscillators as  needed.

AppCad to help with sizing your microstrip:

http://www.hp.woodshot.com/

Use the recommended board layout in the PA data sheet. Thus the Power FET is used as intended, as an amplifier.

AS LONG AS YOU KEEP your striplines under a quarter wavelength between the oscillator and MMIC and then MMIC to Driver you should have few problems.  Typically a 1 or 2  dB PI attenuator between the oscillator and driver amplifier would be used for preventing load pulling.

A DBM module makes for easy control.

Steve


hanakp:
But... GvA-84+ has 20 dBm output power (0.1 W). I need up to 40 dBm.

Oh, you mean then reuse the example amplifier design for BLF2425M9L30? They do provide an example board data on their site, but they call it "test circuit" in the datasheet. Therefore, I'm not so sure that the input and output lines are matched to 50 ohm. Or at least I don't see any stepped-width microstrip sections that are normally used for matching.

https://www.ampleon.com/documents/data-sheet/BLF2425M9L30_M9LS30.pdf

Uunoctium:
Is it an single project? Or will you produce larger quantities?
In first case i would go with ready mades from bison-electronic, PL.

https://www.ebay.de/itm/203941633749?
https://www.ebay.de/itm/203868305296?
https://www.ebay.de/itm/203949784270?
Sufficient enough for burnt fingers...  :P



p.S.: don't forget to implement components like these on the pink foam. Otherwise you got magic smoke
p.p.S: can imagine the real purpose :-+

hanakp:
It's for a specialized instrument for biomaterial preparation. Even if it actually makes it to the market, it will sell dozens of pieces per year at maximum. And right now, they need only 3 or 4 oscillators for testing purposes, that's why I'm reluctant to design it from scratch. But at the same time, they want something repeatable, with components from "respectable" manufacturers, that are likely to stay on the market for 10 years or more. That's how they came to the BLF2425M9L30, it has assured availability up to 2030. Plus, they're cheap enough so they can just stockpile them when the EOL date approaches.

Sourcing used modules from Ebay and the like is out of the question.

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