OPA2673: Please review the schematic

Hi Chase,

I will look through the schematic and get back to you hopefully by tomorrow. Thank you for your patience.

Best Regards,

Ignacio

Hi Chase,

I was able to look over your schematic and had a few of suggestions. For this current feedback amplifier, the choice of Rf has a huge effect on the bandwidth of the device. In a gain of ~11V/V for optimal bandwidth performance, you could use an Rf of around 350ohms and adjust Rg accordingly. A value of 1kohms will work and should be more stable overall but the bandwidth will certainly be less. This can be tuned to optimize stability/bandwidth performance for your system during testing, but this is something I would like to highlight. I would also suggest adding some isolation resistors to the outputs of the amplifiers of around 5ohms. This will isolate any parasitic capacitance due to the resistor network and diodes directly at your outputs. The figure on the first page of the datasheet shows this idea. One other thing I would like to mention is that the bias mode control pins seem to be hard wired to 3.3V. If so, this would mean the device is shut off. To enable this device, A0 and A1 must be 0V. One final suggestion would be to increase C54 to 1uF. This capacitor is ideally open at DC and shorted at AC, using a smaller value would alter your expected behavior so raising this value would be good.

Best Regards,

Ignacio