Aug 3, 2018 #21 A adnan012 Advanced Member level 1 Joined Oct 6, 2006 Messages 468 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,298 Activity points 4,923 Thanks for reply. Find the attached file. When the op-amps are changed to FET type input, the circuit does not work. Attachments DiffAmp.rar 2.9 KB · Views: 34
Thanks for reply. Find the attached file. When the op-amps are changed to FET type input, the circuit does not work.
Aug 3, 2018 #22 KlausST Advanced Member level 7 Joined Apr 17, 2014 Messages 25,184 Helped 4,869 Reputation 9,759 Reaction score 5,545 Trophy points 1,393 Activity points 168,531 Hi, can you show us your TINA results without the need to install TINA? * Screenshot? * PDF? Klaus
Aug 3, 2018 #23 FvM Super Moderator Staff member Joined Jan 22, 2008 Messages 52,432 Helped 14,752 Reputation 29,786 Reaction score 14,106 Trophy points 1,393 Location Bochum, Germany Activity points 298,152 You must not use a floating source to drive the differential amplifier, need to bias it inside the common mode range. Some OPs might float to a mid voltage by chance, at least in a simulation, don't expect this for a real world amplifier.
You must not use a floating source to drive the differential amplifier, need to bias it inside the common mode range. Some OPs might float to a mid voltage by chance, at least in a simulation, don't expect this for a real world amplifier.