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speaking of substrate diodes...

Started by Unknown October 15, 2021
leads to this one...

https://www.dropbox.com/s/cgaxalnn3hhf315/RRIO_Logamp.jpg?raw=1

where we use the substrate diode of a RRIO opamp as a logarithmic
current-to-voltage converter.

There are better ways to do this, but maybe none so cute.




-- 

Father Brown's figure remained quite dark and still; 
but in that instant he had lost his head. His head was
always most valuable when he had lost it.



  
On Friday, October 15, 2021 at 2:52:10 PM UTC+11, jla...@highlandsniptechnology.com wrote:
> leads to this one... > > https://www.dropbox.com/s/cgaxalnn3hhf315/RRIO_Logamp.jpg?raw=1 > > where we use the substrate diode of a RRIO opamp as a logarithmic > current-to-voltage converter. > > There are better ways to do this, but maybe none so cute.
Or as risky. -- Bill Sloman, Sydney
jlarkin@highlandsniptechnology.com wrote:
> leads to this one... > > https://www.dropbox.com/s/cgaxalnn3hhf315/RRIO_Logamp.jpg?raw=1 > > where we use the substrate diode of a RRIO opamp as a logarithmic > current-to-voltage converter. > > There are better ways to do this, but maybe none so cute. > > > >
Assuming your op amp's common mode range goes that far. Which one is it? Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com