Hi,
I am working with AFE 5809 EVM and TSW 1400 to acquire the digitized samples of 8-channel echo signals. Which are further processed in matlab for imaging. The reflected echo signal from transducer are given to AFE5809 and collected the samples in excel sheet for 8 individual channels. Here the AFE in default settings, But the noise echo signal at input and output signal observed in matlab are same. no filtering was happened, and LPF default setting is 10Mhz. 
Above pictures illustrates the echo signal and frequency spectrum, shows that 10Mhz frequencies are also present in the signal. And also I tried using on board digital TGC which is of no help in getting time gain compensated output. So help me in modifying the defaults operation to be able get TGC and filtering and more if any.
Please help me to be able to process the echo signal for perfect imaging.