> He also thought the best idea for this PCB would be to just huddle the > nodes > of Q11-S, C5, R13 and Q7-G close together and not put any other pads close > by and forego the guard ring. He said if he had used an FET input OpAmp, > he > would recommend a guard ring. Why is a FET any different than a FET-input opamp vis-a-vis the guard ring?