Part Number: AFE5808A Hi there, We met similar problem as this thread : Our setup is similar to the orignial thread. We have 64 hardware channels, with 1:2 HV switched to 128 Piezoelectric crystals Elements. When testing, all HV switches are statically switched to 0..63 channels and connected to GND directly with wires. All T/R switch ON (conducted). As below picture. Ultrasound AFE ADC Sample Rate is 40MHz, then do FFT in MATLAB for digital values of each channel. We thought theoretically every channel should be "clean"(both on time and frequency domains) because they are Grounded. However, as test reslts showed below, we found spectrum of some channels are good(Black Rectangle Marked), but some others are Noisy (Red Rectangle Marked). pls ignore the blue plots. Could you please help analyze our result? Thanks. We also would like to know about the orignal psot's solution, and not sure why @ Praveen Aroul suggested the device inputs to be AC grounded. Thanks very much.
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