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.
speaking of substrate diodes...
Started by ●October 15, 2021
Reply by ●October 15, 20212021-10-15
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
Reply by ●October 17, 20212021-10-17
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