wassa said:i want to ask one thing in this regard.
can we do it through some usb microcontroller with built-in A/D converter. can anyone tell me the feasibility of this option and some useful links.
pisoiu said:wassa said:i want to ask one thing in this regard.
can we do it through some usb microcontroller with built-in A/D converter. can anyone tell me the feasibility of this option and some useful links.
Of course you can, but usually the sample rate of the A/D converters included in microcontrollers is too low for that purpose. For example, if you want to view a periodical signal with the freq at 1MHz, you need to sample it with a freq of 2MHz (according to Niquist), but in practice, if you want to see something usefull, you need to sample it at min 5MHz. Microcontrollers are too slow for sampling AND storing the data at that speed.
/pisoiu
dainis said:For example look Ubicom IP2022 risc CPU (price 23 USD), that have up to 160 MHz clock (160 Mips), and have internal Ethernet interface (with internal PHY), also USB interface ... I thinking that is possible on IP2022 making very simple and low cost digital oscilloscope wth analog bandwith 20 MHz ?
It's a good idea but it's not as simple to do when using the same inputs as the ones for the scope since the prescaler (finite impedance) must not degrade the signal. With a separate input, it's more simpler (NB: I saw on the bitscope schematics that the prescaler input impedance is +-50 ohm).A) Maby it's an idee to include a frequency counter using a prescaler like the bitscope did: h**p://www.bitscope.com/design/hardware/?p=5
Yes thks... and we've to choose between the two REF IC !B) You should add a capacitor to the REF 4.096V
I've already did it in a previous project (see the other project on the site). I've putted my own PID and changed .inf file accordingly.There is a simple way to let windows detect a: USB 100MS Digital Scope
By changing FTD2XXX.inf and use a 'own VID & PID' with mprog.
vendor 0403 (dont change) product ID Exxx (change)
My company received 10 product ID's for free from FTDI, but if you use a random one there is only a chance of 1 in FFFF it's double.
See helpfile for Mprog (section D2XX Driver customizing) or PM me
U2 is the 100MHz clock generatorWhere is clock generator (U1) on your "Logic unit" schematic?
If you don't have FPGA look at QuickLogic FPGA (QuickRAM series) h**p://www.quicklogic.com/home.asp?PageID=297&sMenuID=314
We've already discussed about the sampling depth. Having 32k or 64k seems to be an acceptable value. Concerning 8 or 10 bit resolution, one can have the same ADC package with 10 bits resolution instead of 8 for a little extra cost, then we choose 10 bits.Ram: If i take a close look at the tds210 the display has a resolution of 320*200 or maby 400*300 so there should be no need for a 10 bit a/d converter. If the X-axis is 300 pixels and leave some room for streching the axis, 4 times more we need 1200 Bytes. (hope the acex got it) For every timebase the a/d coverter should use another sampling frequency. Or is this completely wrong?
If every (of 10) divisions on the screen got 30 samples the fastes time base is 300nS
DrShoe said:For every timebase the a/d coverter should use another sampling frequency. Or is this completely wrong?
Hey
I was wondering if I can help with writing the necessary code for the DSO project to work. Is this been done already ? or is this project still in the hardware design phase.
beshan
Maybe usage of QT3 libraries should be considered for cross platform compatibility.I planned to write the software with C++ Builder
simce said:Maybe usage of QT3 libraries should be considered for cross platform compatibility.I planned to write the software with C++ Builder
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