THS4541: I designed the parameters according to what we discussed, the closure of the switch and the abandonment of the device are shown in the figure, but I used the oscilloscope at the input end of the THS4541 to measure the relevant VSIN signal

Tool/software:

I designed the parameters according to what we discussed, the closure of the switch and the abandonment of the device are shown in the figure, but I used the oscilloscope at the input end of the THS4541 to measure the relevant VSIN signal, but the VSIN signal at one end and the DC signal at the other end, the value is equal to 0.5VDD_FDA, and there are only two DC signals at the output of the opamp whose value is equal to 0.5VDD_FDA.