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Different technology

The SDS uses frequency division and brick wall filtering to firstly change the frequency and then the waveform of the signal from the clock. Since there are a finite number of possible "n" in the divide-by-n counter there are finite steps in the frequencies that can be generated. If the filters are good enough the waveform approximates a sine wave very closely.

I will use an analogue oscillator like in the present circuit but I will be using the digital clock signal to directly control the oscillation frequency. This promises the best of both worlds - the analogue oscillator generates a sinewave so it doesn't need filtering, it is infinitely variable so there are no steps. The digital control means it's very stable; better than 1 part per billion is possible (if impossibly expensive).

Mark Kelly


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