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In Reply to: Re: Yes posted by Ray-o-Stat on August 4, 2006 at 18:33:08:
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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Follow Ups
- Different technology - Mark Kelly 20:20:55 08/04/06 (10)
- Re: Different technology - mosin 21:39:46 08/04/06 (9)
- Let's make it cheaper - Mark Kelly 00:32:17 08/05/06 (8)
- Mark. Which model T-amp... - Ray-o-Stat 08:11:16 08/05/06 (2)
- The cheap one - Mark Kelly 17:03:57 08/05/06 (1)
- OK cool. I was hoping you would say that :-) /nt\ - Ray-o-Stat 22:10:40 08/05/06 (0)
- Re: Let's make it cheaper - mosin 05:22:33 08/05/06 (4)
- OK I'll start work on the oscillators - Mark Kelly 06:24:38 08/05/06 (3)
- Re: OK I'll start work on the oscillators - mosin 08:52:14 08/05/06 (0)
- Re: OK I'll start work on the oscillators - Ray-o-Stat 08:15:53 08/05/06 (1)
- No problem - Mark Kelly 16:20:44 08/05/06 (0)