Data Acquisition System of ERT Based on DSP and FPGA

In order to combine real-time signal processing ability of DSP and logic controllable,hardware programmable of FPGA,a novel 16 electrodes ERT data acquisition system was constructed.In this paper,FPGA was used to realize excitation signal generation,front-end signal processing,system logic control and orthogonal sequences demodulation,while DSP accomplished data post-processing and image reconstruction.Experiments show that this modularization design guarantees a better maintainability and expansibility and then effectively improves imaging speed and measurement precision of the ERT system.