Implement research on multi-channel sampling and level drifting for ultra sound phase array

The proposed ultra sound phase array system experimental testbed, including a self-developed multi-channel acquisition card, which samples and holds eight-channel analog signals using two ADCs simultaneously for phase array signal processing. The problem of the voltage level drifting occurring between four in-phase and quadrature receivers is addressed. A multi-channel acquisition card is solved and the validity of the system is verified on the basis of the data actually retrieved by this card.