Daniel Rozsnyó wrote:
OGP does not do PCIe (yet). Only PCI and PCI-X.
Anyway, for your instrument I would suggest interfacing it to USB2 if
you can offload the processing to dsp/fpga, but that won't be under
$100. For such a price you can get an ADC and a PCIe interface, but then
you will have troubles with processing the 500+ MB/s of data in realtime
on the PC's CPU..
I don't think that it would need to process this much data per second.
A spectrum analyzer, like a digital oscilloscope, does not deal with
real time data but rather with a periodic signal. To be more specific,
a digital oscilloscope displays a periodic signal on the screen and the
refresh scans rather slowly from left to right.
Actually, a spectrum analyzer is *only* software that takes as input the
digitized output of a digital scope. The software can either use the
FFT or can obtain the Fourier coefficients by numerical integration.
The only difference in the hardware is that it would be best if the scan
frequency could vary to display exactly one cycle -- which means a
variable sample clock and a PLL.
So the question is whether you can make a good PC card digital
oscilloscope for $100.00. You need an oscillator, frequency divider,
PLL, sample & hold, and DAC as well as the PCIe interface. I seriously
doubt that this is possible for $100.00 but it does depend on the
maximum input frequency you wish to use, sample rate, and the accuracy
(and number of bits) needed. Actually, you can spend over $100. on a
good DAC
--
JRT
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