The summing (usually inverting) amplifier is a classic op amp configuration. However, I'm struggling to find any products on the market which actually do this, leading me to conclude that I have to build my own.
The move from the textbook with its ideal components to the messy real world often comes with gotchas and problems you might not have thought of, and these practical considerations often end up dominating the noise budget of a system.
So: what kind of issues are there to be wary of when building a low noise, ~150 MHz, ~5dBm output, unity gain summing amplifier from parts? Or, alternatively, do commercial systems with these problems conveniently pre-solved exist?
Thanks in advance.