Fast (really fast, as in 1ns fast) ADC
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Hi all, I am looking for a high speed, 16-bit, serial output analog to
digital converter... I am trying to measure a signal "impulse" that has a
0.7ns rise time. I do have a diode/capacitor setup to capture the peak, but
my circuit can't hold the peak for very long. I have done some digging for
such a device, and I've found 6 and 8-bit ADC's that are fast enough, but
not 16-bit or even 12-bit ones... Any ideas??
digital converter... I am trying to measure a signal "impulse" that has a
0.7ns rise time. I do have a diode/capacitor setup to capture the peak, but
my circuit can't hold the peak for very long. I have done some digging for
such a device, and I've found 6 and 8-bit ADC's that are fast enough, but
not 16-bit or even 12-bit ones... Any ideas??
Comments
Chuck[/font]
If you're attempting to capture single-shot events of 0.7nS with any degree
of resolution, your sample rate has to be (roughly) 1/0.07nS, or about
14GHz! If the events repeat regularly, you can fake fast sampling with
techniques used for many years in sampling oscilloscopes. Home-brew
sampling circuits have been described within the last few months in the
"Ideas for Design" column in Electronic Design magazine <www.elecdesign.com>.
>Hi all, I am looking for a high speed, 16-bit, serial output analog to
>digital converter... I am trying to measure a signal "impulse" that has a
>0.7ns rise time. I do have a diode/capacitor setup to capture the peak, but
>my circuit can't hold the peak for very long. I have done some digging for
>such a device, and I've found 6 and 8-bit ADC's that are fast enough, but
>not 16-bit or even 12-bit ones... Any ideas??
Mike Hardwick, for Decade Engineering -- <http://www.decadenet.com>
Manufacturer of the famous BOB-II Serial Video Text Display Module!
It's in the 9/18/2000 issue, and it's titled "1-GHz Sampling Osciloscope
Front End Is Easily Modified" by Hubert Houtman. The web site mentioned
below gives access to Design Idea articles as far back as March of 1997...
>If you're attempting to capture single-shot events of 0.7nS with any degree
>of resolution, your sample rate has to be (roughly) 1/0.07nS, or about
>14GHz! If the events repeat regularly, you can fake fast sampling with
>techniques used for many years in sampling oscilloscopes. Home-brew
>sampling circuits have been described within the last few months in the
>"Ideas for Design" column in Electronic Design magazine <www.elecdesign.com>.
Mike Hardwick, for Decade Engineering -- <http://www.decadenet.com>
Manufacturer of the famous BOB-II Serial Video Text Display Module!
really understand what is happening.
Original Message
From: Mike Hardwick [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=uI5mP309VUEHwmLNSkhCH4uNys9zgW8An5Ndaw3eNMuJ_9Kw9t-k0kjAKD5Q2cws3zi5aYnsDeKFG5fwBOHzaA]decade@w...[/url
Sent: Monday, March 12, 2001 5:20 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Fast (really fast, as in 1ns fast) ADC
I found the Electronic Design issue date for one of the sampling circuits:
It's in the 9/18/2000 issue, and it's titled "1-GHz Sampling Osciloscope
Front End Is Easily Modified" by Hubert Houtman. The web site mentioned
below gives access to Design Idea articles as far back as March of 1997...
>If you're attempting to capture single-shot events of 0.7nS with any degree
>of resolution, your sample rate has to be (roughly) 1/0.07nS, or about
>14GHz! If the events repeat regularly, you can fake fast sampling with
>techniques used for many years in sampling oscilloscopes. Home-brew
>sampling circuits have been described within the last few months in the
>"Ideas for Design" column in Electronic Design magazine
<www.elecdesign.com>.
Mike Hardwick, for Decade Engineering -- <http://www.decadenet.com>
Manufacturer of the famous BOB-II Serial Video Text Display Module!
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