hi TI
Using the lmh6881 simulation model downloaded from the official website, the peripheral input circuit is modified, but the simulated magnification is less than 20 times. Please help to see what's wrong? thanks
1200
Hi kai
Thank you for your guidance, but after I use spice to replace it according to your figure, it is still only 10 times. Can you help me guide how to check it?
Hi Rain,
like this (look at R1)?
Seems like that the "EN" input of LMH6321 in your schematic has no proper ground connection?
Kai
Hi kai
It has been modified according to your suggestion, but the results have not changed. Can you simulate with pspice-for-ti tool? The pspice version is shown in the figure below. Thank you
Hello Rain,
Kai used the post processing functionality in Tina-TI to achieve the correct gain in respect of Vin.
Here is a thread in which Kai and Hasan explain this using Tina-TI: https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/915301/lmh6881-simulation-in-tina
The same concept would need to be done in PSpice for TI:
I have attached the PSpice for TI project with your schematic. To obtain the trace measurements, run the AC sweep. Then right click anywhere on the empty plot, and select add trace and enter the equation as shown in the image above.
Let me know if you run into issues or have any questions on the above information.
Thank you,
Sima
