I've been working with the following very basic opamp circuit:
I've built this Voltage amp a few times for a couple of low-frequency opamps, and it never let me down. I now need to amplify a high-frequency signal for the first time, however, so I switched to the OPA699 in the hope of amplifying a ±10 MHz signal.
The above image shows the exact circuit I built. I built it "dead bug style", meaning the opamp has been glued upside down onto a copper plate, and all resistors have been soldered together mid-air. The copper plate functions as a ground plane. The opamp is directly connected to a power supply, which is specifically designed to supply an extremely stable (there's some huge capacitors in there) ±5V voltage. The input signal is a 100 Hz sine, supplied by a TABOR 8020 function generator through a small cable, while the output is readout using a BNC bus connected to my oscilloscope.
Now my problem: when I build this circuit with my low-frequency opamps, both on a breadboard and dead bug style, all is well. But with this high-frequency opamp, the circuit doesn't work. When I don't apply any voltage to the input whatsoever, the opamp still clips. Applying a small DC input voltage doesn't change a thing.
All that appears to generate any output whatsoever is applying a signal that is sure to overload; a 5Vpp sine wave for instance gives a very noisy clipped sine wave as output. The output is then riddled with 12 MHz noise.
When I attempt to apply an offset to the opamp, I again get MHz-range noise.
I'm starting to believe that either the OPA699 isn't built for such a voltage-amplifier circuit, or that I'm making a huge mistake in my circuit. I know that at high frequencies, opamps can start oscillating (which is why I opted for dead-bug-style), which might invalidate my circuit. Is there any way I can get this to work?
TL;DR: I built the above circuit. When I give a sine input, the output either clips completely or consists mostly of MHz-range noise. I'm thinking that either I'm misusing the OPA699, or perhaps my circuit is not meant to be used in high-frequency applications.
OPA699 datasheet: http://www.ti.com/cn/lit/ds/symlink/opa699.pdf