Floating-point number FIR digital filter and design method thereof

Abstract

The invention discloses a floating-point number FIR digital filter and a design method thereof, and belongs to the technical field of digital signal processing in a high-voltage pulse power supply system. The filter comprises a to-be-filtered data storage module, a filter coefficient storage module, a floating-point number conversion module, a first-in first-out memory module, a memory control module, a first random access memory, a second random access memory and a floating-point number multiply-accumulate module. The FIR digital filter based on floating-point number operation can be realized, the precision of a filtering result can reach the precision of a theoretical value calculated by MATLAB, compared with a traditional fixed-point number filter, the introduced quantization error is greatly reduced, and meanwhile, low-pass filtering can be carried out on a signal which is acquired in a high-voltage pulse power supply system and receives high-frequency interference, and a foundation is laid for subsequent signal monitoring and analysis.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing in a high-voltage pulse power supply system, and in particular relates to a floating-point number FIR digital filter and a design method thereof. Background technique [0002] For the high-voltage pulse power supply system, because the load of the high-power switching tube in the switching circuit is the primary coil of the high-frequency transformer, it is an inductive load. When the high-power switching tube is turned on and off, both ends of the primary side of the high-frequency transformer will Spike noise occurs. The high current change rate and high voltage change rate generated during the working process, their surge current and peak voltage form a source of interference, because analog signals such as voltage and current inside the power supply system are easily subject to high-frequency interference, resulting in The signal waveform is mixed with a lot of high-frequenc...

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Problems solved by technology

However, the data processing of the traditional FIR filter in the FPGA is processed by fixed-point numbers. For example, Guo Xiaoyu of Wuhan University designed a FIR digital filter based on FPGA design in his master thesis [Guo Xiaoyu. FIR digital filter based on FPGA] The realization of the filter, Wuhan University, 2004], is to use the fixed-point number to carry out the filter calculation, because the precision range that the fixed-point number can represent is very limited, so if the digital filter is performed through the fixed-point number, especially in the multiplication and accumulation (MAC) structure The quantization error introduced by the filter is very easy to enlarge with the process of multiplying and accumulating, and finally causes a large deviation between the actual filtering result and the theory. cycle increase

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