monnoliv said:Try this: **broken link removed**
RIS (random interval sampling) is good advanteges of scopes. Old HP scopes work with 500 MHz bandwith with 20 Mhz ADC. Its TDC (time to digital converter) based. Analog trigger start TDC then ADC clock stop it. At the TDC out DC voltage is proportional to trigger to clock delay. Low speed ADC convert this voltage to code proportional to delay.Make_Pic said:I need any information about a stroboscopic method of the measurement for DSO! The stroboscopic method allows to measure Frequencies up to about 3 GHz.
I have some information, that TDSxxx oscillscopes do not have fast ADC, but for fast sampling it use CCD (charge-coupled device device) device, may be it have different name (not CCD) ....alphi said:Hi,everyone known which sample adc chip be used in tek digital oscilloscope:TDS220?
that's what I did, no?- use a full differential OP at the input of the ADC is better (better noise relation).
It looks like a very nice project, but it would be easier to make comments if you translated the site into English.monnoliv said:Hi, look here **broken link removed**.
It's a two channels DSO (2x100MS/s with FIFO), I've just finished the schematics. I'm going to do the design of the PCB. The purpose of this project is to have a cheap self powered DSO on USB port. Open source design, comments welcome !
@+,
alphi said:Hi,everyone known which sample adc chip be used in tek digital oscilloscope:TDS220?
That is not true, normally the input impedance of oscilloscopes is 1 MΩ || ~10-100 pF.Skov said:Usually, the input chain of oscilloscopes has low resistance (50..150 Ohm) in accordance with low impedance of cable
which is connected to oscilloscope. The dissipated power for input chain is limited.
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