Hi folks,
Ive been reading up on everything google had to offer, including the related threads on this forum. However im drawing a blank and im about to lose my sanity over this. So here goes:
I have a simple set up to verify that the AD623 does its job at amplifying the signal _linearly_. The V- is grounded, V+ is connected to a voltage divider with a potensiometer (to adjust input voltage for testing), Vs+ is 5V, Vs- is grounded, Ref is grounded and i am of course measuring on the output pin.
The Rg is 5k Ohms, which makes the gain about 20.
The problem is: What i put on the V+ pin seems to have NO linearity with what comes out at the output pin. Im trying to check the gain factor by dividing the voltage at the output pin with the voltage at the V+(input) pin and the Gain factor is a LOT at very small voltage and almost nothing at higher gains. (Ofcourse it will stop amplification of the signal when Output reaches 5V, but i mean even before this happens).
I am very lost and totally out of ideas so PLEASE anybody help me!
Thank you so much for any help!
Ive been reading up on everything google had to offer, including the related threads on this forum. However im drawing a blank and im about to lose my sanity over this. So here goes:
I have a simple set up to verify that the AD623 does its job at amplifying the signal _linearly_. The V- is grounded, V+ is connected to a voltage divider with a potensiometer (to adjust input voltage for testing), Vs+ is 5V, Vs- is grounded, Ref is grounded and i am of course measuring on the output pin.
The Rg is 5k Ohms, which makes the gain about 20.
The problem is: What i put on the V+ pin seems to have NO linearity with what comes out at the output pin. Im trying to check the gain factor by dividing the voltage at the output pin with the voltage at the V+(input) pin and the Gain factor is a LOT at very small voltage and almost nothing at higher gains. (Ofcourse it will stop amplification of the signal when Output reaches 5V, but i mean even before this happens).
I am very lost and totally out of ideas so PLEASE anybody help me!
Thank you so much for any help!