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Old 22nd April 2002, 04:34 PM   #1
mlloyd1 is offline mlloyd1  United States
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Default IV Converters, PA630 IC?

Some of the recent discussion on I/V converters and op amps loosened some memories. One that I remember reading about some 7 or so years ago was an IC called a current converter. The part number was PA630. As I recall, it was NOT an op amp, but a numer of current mirrors one could configure to follow a DAC, addressing a number of the performance issues mentioned with op amps in recent discussions.

I never bought or otherwise sampled any of these devices and was wondering if any of you did. If so, what did you think? And why is it there doesn't seem to be much info on this device on the web? This link to Wadia info makes me think maybe Wadia secured the rights to this device.

Just curious.
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Old 22nd April 2002, 06:18 PM   #2
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I have just followed Nelson's design for I/V conversion to an I out from a DAC.I have a little prototype drawing likely to work:
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Old 24th April 2002, 08:08 AM   #3
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Question PA630

Hi Mlloyd1,
You mean the current-conveyor by Photonics?
http://archives.e-insite.net/archive...294/10di10.htm
Could not find a website yet.
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Old 24th April 2002, 08:22 AM   #4
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I think I know where they got the idea from. Maybe our lawyer needs to look into this. Maybe not.

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Old 24th April 2002, 12:24 PM   #5
mlloyd1 is offline mlloyd1  United States
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Default Re: PA630

Yes; this is the device. You also found all I could find on the device and the company via the web.

I remember at least one company some time ago bragging about their IV converter using this device and its superior performance to conventional opamps with feedback. I'm still check my papers here....

Also, as I recall it was not a cheap device,built on DI process. Maybe $30 USD per chip?

I'm curious what Jocko means ... patent infringment maybe?

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Originally posted by Elso Kwak
Hi Mlloyd1,
You mean the current-conveyor by Photonics?
http://archives.e-insite.net/archive...294/10di10.htm
Could not find a website yet.
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Old 24th April 2002, 01:12 PM   #6
mlloyd1 is offline mlloyd1  United States
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I found my data sheets (I can prove to my wife I'm not senile .... yet!) More details after I find someone with a scanner.

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Old 24th April 2002, 04:27 PM   #7
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No. I designed a I/V stage back '89 that sounds a lot like what they are describing. At least if you can believe what they are saying. I KNOW Wadia knows about my circuit.

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Old 27th April 2002, 05:28 AM   #8
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Talking The idea is quite old !

Eveyone whom has learn about the current mode technology would knew the part PA630 & PA630A! It was present as a classical design of current conveyor in the textbook. And, one of it's typical use which was present in textbook is a open-loop I/V convertor for audio application!!! I guess that the DAC in the textbook is PCM-XX or AD-XXXX.

I'm very curious how can Wadia get the patent.
To get a patent is so easy like this?
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Old 27th April 2002, 05:37 AM   #9
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Most likely their patent......if they even have one......is based on how it is fabricated, implemented, or some other nonsense.

But the emperor usually has no clothes. Wadia is no exception.

Jocko
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Old 3rd January 2003, 10:42 AM   #10
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Here is a link that may work. Not much info on the PA630, just an application.

http://www.e-site.net/ednmag/archive...294/10di10.htm

Dallas has an interesting chip using mirrors.

http://www.maxim-ic.com/appnotes.cfm/appnote_number/692
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