Design of a Multiplex Data Collecting Controller Based on FPGA

In order to satisfy some requirements for special data acquisition systems, in this paper, a new design method used by data collecting controller is introduced. The main objective of this approach is to integrate DAC and ADC chips into one FPGA (Field programmable Gate Array) chip. The controller can not only collect multiplex analog data, but also output multiplex analog controlling signals, coupled with a minimum amount of external components. At the same time, this approach reduces the cost of hardware and resource of software exceedingly. Employing the principle of PWM, the paper puts forward a new design method to implement conversion between digital signal and analog signal without special DAC or ADC based on FPGA. Moreover, the principle and working mechanism of the controller is discussed in details, while the internal circuit block diagram is also presented.