HI!
My purpose is to detect the impedance information of two signals. And the two input signal are about 2v, 100KHz, then it pass a resistance attenuation network(refer to the Datasheet in page 19). Now, the signal attenuates to about 200mV,The schematic as follow.
Q:
1. the formal input signal is shaken and distorted by the attenuation network, how can I eliminate the distort?
2. I have change the value of R167 and R178 to 1KΩ, what is the influence of this changes?（If I set the two resistors to 52Ω , the input signal will disappear ）
3. no matter I change the input signal, the average of VMAG stays at about 1V and VPHS stays at about 1.04V, where is the problem?
looking forward your reply!