Re: Extending frequency range question


If you want higher frequencies, you need a different generator - or redesign the current one. The AD9851 typically runs at 180MHz, and the "cleanest" sine waves are under 60MHz. Due to the wonders of aliasing, there IS an image signal: this is what the low pass filter is supposed to eliminate.

For a higher frequency, go to the Analog Devices website and read up on the AD9958: run with a clock of about 500MHz, produces signals up to about 200MHz. There's currently even a board available on Ebay for about $85 USA.

There are even higher frequencies possible, but the chips get rather expensive - and I suspect the design would be more sensitive to noise / layout issues.

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