Part Number: THS4271
Tool/software: TINA-TI or Spice Models
I am getting differences in the simulation when using single-supply vs dual supply.
I tested with the THS4271, and OPAx828 TINA-TI Spice Models.
The OPAx828 shows the same gain/phase results for single supply and dual supply.
The THS4271 shows strange results for single-supply, and strange phase for dual-supply (but good gain)
I compared these "open-loop" simulation results with the datasheets, and the OPAx828 is perfect in line with the datasheet.
The THS4271 just seems...wrong. Like there is a problem with the SPICE model.
What do you guys think?
#1THS4271VDD = 10V, V+ pin Vref is 5V (Vos and Vcm etc should be fine)
#2THS4271VDD = ±5V, V+ pin Vref is GND (Vos and Vcm etc should be fine)
#3 OPAx828VDD = 10V, V+ pin Vref is 5V (Vos and Vcm etc should be fine)
#4 OPSx828VDD = ±5V, V+ pin Vref is GND (Vos and Vcm etc should be fine)
I have seen the behavior you are seeing in plot #1 before. It seems to be an issue with how the simulator is solving the circuit for certain configurations. My first suggestion would be to change the analysis parameters by opening the Analysis->Set Analysis Parameters menu. Then click the hand symbol in the bottom right of the window and select open. This should open to a default directory and at the bottom you should find several pre-set parameter (.PRM) files. Try the "DC Convergence of nonlinear circuits" or the "Irregular circuit problems caused by floating nodes" and see if that helps.
Jacob Freet High Speed Amplifiers
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