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- Users: skelmonsta
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oscillator bank
There is significant crosstalk, but calibrating for this is not a problem. I appreciate the point about sidebands, but my prototype has worked well so far---as long as I make sure there is enough headroom in the mixer for linearity with more carriers I should be OK. Any oscillator bank...- skelmonsta
- Post #40
- Forum: Circuit design
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oscillator bank
VE1BLL, thanks again- I did think of using FFT hardware, but my requirement for separate physical signals makes it useless unless there's some really profound hack I'm missing. Hardware FFTs work a lot like software ones-- there is a butterfly pattern of multiplications. For an IFFT, the input...- skelmonsta
- Post #37
- Forum: Circuit design
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oscillator bank
Let me first say a "wow" and "thanks" to the quantity and quality of discussion here. I was expecting a new idea or two to trickle in if I was lucky---as it is I have only just found time to keep up. This is a great forum. 0.01% seemed like a loose frequency requirement, but because of the...- skelmonsta
- Post #33
- Forum: Circuit design
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oscillator bank
VE1BLL - the phases really don't matter, as long as their modulation doesn't move the frequencies outside of my pretty loose requirements. I am not locking to any phases, just determining overall amplitudes with every FFT. So if I go with the "big memory" solution, I think I can cut some...- skelmonsta
- Post #14
- Forum: Circuit design
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oscillator bank
geekEE, thanks for the pointer. I was hoping there would be some multi-oscillator chip out there.- skelmonsta
- Post #8
- Forum: Circuit design
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oscillator bank
> Huge memory. Thanks VE1BLL, this is a good idea. Since my frequencies don't have to be very accurate, I can probably fudge the LCM a lot too.- skelmonsta
- Post #7
- Forum: Circuit design
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oscillator bank
Hi all, I'm a software/DSP guy currently a bit over my head designing some hardware. I have a design in mind for my problem, but it's based on technology I would have used to do this twenty years ago. So I am writing in hopes of getting a "sanity check" on my solution. Problem: build an...- skelmonsta
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- Replies: 41
- Forum: Circuit design
