Other Parts Discussed in Thread: OPA857, TS5A3357, TINA-TI
Good afternoon, I am using the subject amplifier in a transimpedance application with a photodiode. Currently, in addition to the transmipedace stage, we have a second gain stage and then a third stage with a VGA. We are trying to get rid of the second and third stages to combine the variable gain function into the transimpedance stage by using a device such as the TSA3357 part or similiar. See attached...
I am hoping to use the switch to bring in various feedback resistors in to modify the gain. I'm concerned about capacitance affecting the BW of the opamp. What else should I be concerned about? Are there other TI switches that would work better?
Thanks,
Robert