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QUESTION: Spectrally pure DDS Output?
I have the following question regarding DDS chips:
The amqrp website and others detail techniques for using Analog Devices', DDS chip as an accurate digitally controller oscillator. One of the issues that needs to be bourne in mind according to the articles is the spectral purity of this chip's output. There seem to be various schemes using PLL and filtering to kill the harmonics and spectral "grass" that these things seem to generate. Given the onward march of technology, is there any chip similar to the Analog Devices DDS, that would give be a spectrally pure, low noise sinusoid with any further filtering or PLL? I'd like something good enough to be a high quality VFO for an HF receiver (I and Q available)?? Is such a thing available, preferably offering a presoldered evaluation board (I don't want to go blind soldering it!!) for 30 or 40 bucks kind of price range?? Thanks, Tim |
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