"Composite Op Amp For High Performance," Siliconix AN81-3, July 1983

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JR.
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Re: "Composite Op Amp For High Performance," Siliconix AN81-3, July 1983

Post by JR. » Sat May 18, 2019 12:05 pm

IIRC Brad Wood (RIP) was working on a crazy low noise JFET MC preamp as one of his later projects.

He may have left some evidence around the internets, I don't see much on his old facebook page where I think he may have shared it once.

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mediatechnology
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Re: "Composite Op Amp For High Performance," Siliconix AN81-3, July 1983

Post by mediatechnology » Sat May 18, 2019 1:10 pm

Brad gets the credit for introducing me to the ZTX851.
At the time he hadn't used it but had read the new edition of Horowitz and Hill and pointed me in that direction.
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Re: "Composite Op Amp For High Performance," Siliconix AN81-3, July 1983

Post by billshurv » Sat May 18, 2019 3:17 pm

Found it. This is the list from Gerhard posted on DIYAudio. The CPH5902 is the one that looks most interesting even if you have to ignore the built in bipolar. Of course linear might finally pull their fingers out and sort out production of the LSK489...
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mediatechnology
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Re: "Composite Op Amp For High Performance," Siliconix AN81-3, July 1983

Post by mediatechnology » Sun May 19, 2019 5:50 am

The CPH5902 is one they got from Sanyo's product line. Interesting. Thanks for the list.

https://www.onsemi.com/PowerSolutions/p ... id=CPH5902

This is the parametric table of ON JFETS. ON has nice tables.

https://www.onsemi.com/PowerSolutions/p ... 6/products
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