[time-nuts] new op amp for distribution amplifiers

[ed breya]

I'd suggest that if you wish to use a DIP or SO-8 version of a single 
CFA, and attain maximum BW and flatness, on a regular board, it should 
be mounted on the ground plane side, and the feedback resistor should be 
underneath on the opposite surface, directly between the output and 
inverting input pins, (through small vias, in the case of an SO-8 
package). Also, the bypass capacitors should be on the ground plane 
side, adjacent the power pins.

Dual CFAs are a different story, due to different pinout - the same 
principles apply, but crosstalk becomes an issue.

If you desire to keep the feedback network R as low as possible, the 
inductance of the runs going around the IC on the same plane will become 
a bigger factor, possibly causing the observed peaking. So, it's best to 
keep it a short trip, either underneath, or even tacked on top of the 
IC. Likewise, the shunt resistor to ground from the inverting input 
should go straight to ground plane, right next to the non-inverting 
input termination resistor, so they both see nearly the same ground point.

Ed