AD797 - FAQ

What do I do with the "null pins" on the amplifier if I don't plan to use them?

The null pins should be left floating, and not connected if unused.

What is a "decompensated" op amp?

Feedback stability theory states that the closed-loop gain must intersect the open-loop gain at a slope no greater than 6 dB/octave (single pole response) for the system to be unconditionally stable. For a given amplifier, the bandwidth can be increased at higher gains if the amplifier is not designed to be unity gain stable. This type of op amp is sometimes referred to as a decompensated op amp. Please see Tutorial MT-033, Voltage Feedback Op Amp Gain and Bandwidth.