The Method of Real-Time Data Weighting Operations of CPLD/FPGA in Measurement Systems

—For measurement systems, guaranteeing the accuracy is the primary task and optimizing resources has strong connection with low power consumption and low cost. There is a need for smooth filtering, median filtering and some other data processing in Complex Programmable Logic Device or Field-Programmable Gate Array design of measurement systems. And the weighted arithmetic is indispensable for filtering. Combined with the characteristics of data acquisition in measurement systems, a new real-time weighted method is put forward. This method does not need to call IP core and built-in CPU. Two data registers with different bits are designed in Complex Programmable Logic Device or Field Programmable Gate Array. Combining with the addition and shift operation of the input data with the addition and shift operation of quotient together to form the new weighted division data, this method owns the advantages of good realtime ability and high accuracy compared with the conventional division operations. And it can be used in the Complex Programmable Logic Devices without IP core, as well as in low power consumption Field-Programmable Gate Arrays. This method achieves the goal of utilizing resources according to the function realization of the measurement systems. To acquire the same function with the traditional design pattern, the feasibility and effectiveness of the method described in this article are verified through designing five-order smoothing filter test. This method has been used in a project, which proves that the method is reliable, efficient and stable in practical application.