PC oscilloscope.. - Electronic Circuits Projects Diagrams Free

tariq7868 · 8th July 2009, 09:02 PM

Hello.. is there a way tht we can make a pc oscilloscope which have atleast 20MHz of bandwidth??? ,, no matter what port to interface it with... can anybody provide me with circuit diag?

blueroomelectronics · 8th July 2009, 09:13 PM

If you're trying to DIY it to save money over buying one you're going to find them very complex and expensive to build from scratch.

tariq7868 · 9th July 2009, 07:37 AM

but still i want to make it...

**Nigel Goodwin** · 9th July 2009, 09:24 AM

Quote:

Originally Posted by tariq7868

but still i want to make it...

Well make it then - there are various documents about then on the net, often university projects that people have designed for their final projects.

You're probably going to need FPGA's to get the required speed, and fast memory to store to.

Hero999 · 9th July 2009, 08:29 PM

Bear in mind you'll need to sample at at least 40MHz but to be of any use you really need to go even higher. Sampling at 40MHz will cause you to loose most of the phase information at 20MHz. For example, you have two 20MHz signals 90° out of phase, they appear to be in phase because the deplay between the two signals is 1/80M 1/40M. I'd recommend sampling at 100MHz or even higher.

BrownOut · 9th July 2009, 08:48 PM

Alternatively, you can use repetative sampling for periodic waves. You'll get better resolution, but you'll lose visibility for any transient behavior.

crutschow · 9th July 2009, 10:21 PM

And, of course, you need a graphical interface that will display the measured data as a waveform on the PC screen.

All-in-all building a PC digital oscilloscope from scratch is a very complex task. Unless you are an expert with high speed digital and analog circuits, your chances of success are not high.

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8th July 2009, 09:02 PM	#1
tariq7868	PC oscilloscope.. Hello.. is there a way tht we can make a pc oscilloscope which have atleast 20MHz of bandwidth??? ,, no matter what port to interface it with... can anybody provide me with circuit diag? __________________ Rεσllγ !!! Mγ Σ×ρer!ence is Directly Propotional τΘ the NΦ of Electronic Items I have Me§§eD µρ ...

8th July 2009, 09:13 PM	#2
blueroomelectronics	If you're trying to DIY it to save money over buying one you're going to find them very complex and expensive to build from scratch. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

9th July 2009, 07:37 AM	#3
tariq7868	but still i want to make it... __________________ Rεσllγ !!! Mγ Σ×ρer!ence is Directly Propotional τΘ the NΦ of Electronic Items I have Me§§eD µρ ...

9th July 2009, 08:29 PM	#5
Hero999	Bear in mind you'll need to sample at at least 40MHz but to be of any use you really need to go even higher. Sampling at 40MHz will cause you to loose most of the phase information at 20MHz. For example, you have two 20MHz signals 90° out of phase, they appear to be in phase because the deplay between the two signals is 1/80M 1/40M. I'd recommend sampling at 100MHz or even higher. __________________ I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong. Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.

9th July 2009, 08:48 PM	#6
BrownOut	Alternatively, you can use repetative sampling for periodic waves. You'll get better resolution, but you'll lose visibility for any transient behavior. __________________ You don't need a quadraphonic Blaupunkt -- you need a curve ball.

9th July 2009, 10:21 PM	#7
crutschow	And, of course, you need a graphical interface that will display the measured data as a waveform on the PC screen. All-in-all building a PC digital oscilloscope from scratch is a very complex task. Unless you are an expert with high speed digital and analog circuits, your chances of success are not high. __________________ Carl Curmudgeon Elektroniker