Other Parts Discussed in Thread: OPA695
I built the following circuit. There are three OPA4872 in the first stage, one OPA4872 in the second stage and OPA695 in the last stage to form a 10:1 multiplexer.
I have a total of eight, 10:1 multiplexers. Supplies are +/-4V5.
I find that the input at R4 (the input to U1) is distorted or possibly unstable for square wave.
The square wave below is 400KHz for 50R input termination (R4).
I have removed the cable and the signal looks normal. I have changed 50R to 1K and the signal looks better but is still distorted or possibly unstable.
The square wave below is 400KHz for 1K input termination (R4).