I have designed a circuit using the OPA2356-EP, with 100nF decoupling capacitance as suggested in power supply recommendations on page 19 of the datasheet. However I notice that page 20 lists 10uF as the minimum decoupling capacitance, which seems quite large. There is a 10uF back at the regulator, but each opamp only has 100nF locally.
The fundamental of my signal is 20 MHz, the 100nF provides very low impedance at that frequency, but there are also some higher frequency harmonics that I would like to preserve if I can. I am seeing slightly worse slew rate than expected on the output signal. I am therefore wondering if something like 22nF decoupling for high frequency signal and 10uF for bulk at each opamp would be a more suitable arrangement, but given the conflicting information in the datasheet I wondered if you could give any insight on the intended/preferred decoupling arrangement before I start trying things empirically!
Thanks
