Method for implementing low-cost low-power-consumption programmable multistage FIR filter

Abstract

The invention relates to a method for implementing a multistage FIR filter in the field of an integrated circuit. The method for implementing the multistage FIR filter relates to an arithmetic unit, a control unit and a software environment for conducting programming configuration on the control unit. The arithmetic unit comprises a pretreatment unit, an ALU and a storage unit RAM, a transfer function of the filter is calculated through time division multiplexing, the mode that data in the RAM are flexibly read by changing addresses is adopted, and therefore a large quantity of data transfer power consumption in a typical filter implementation method is saved. The control unit comprises a storage unit ROM and a plurality of counters and summing units, commands and coefficients in the transfer function of the filter are provided for the arithmetic unit, therefore, filtering arithmetic of the arithmetic unit is finished in specific control step-by-step numbers, and a filtering result is acquired. The software environment conducts the programming configuration on the control unit according to performance parameters of the filter, and therefore a custom-made FIR filter suitable for application requirements is acquired. The method for implementing the multistage FIR filter can be mainly used for achieving a multistage FIR decimation filter, a multistage FIR interpolation filter and a multistage FIR same-speed filter, the function that the area can reach the minimum level of documents which have been published internationally can be achieved, and the method for implementing the multistage FIR filter has the advantages of greatly reducing the power consumption and customizing products according to the application requirements.

Description

technical field [0001] The invention relates to a method for realizing a multi-stage FIR filter in the field of integrated circuits. The realization area of ​​the method can reach the lowest level in international published documents, and the power consumption can be greatly reduced. At the same time, it has the feature of programming. The implementation method has great application prospects, and can be specifically used in the realization of multi-stage FIR decimation filters, multi-stage FIR interpolation filters, and multi-stage FIR same-rate filters. Background technique [0002] Filters are the basic modules used for signal processing in electronic products, and they are indispensable in a large number of electronic products and play an important role. Due to the advantages of high performance, high precision, high signal-to-noise ratio, and high reliability, digital filters are preferred over analog filters. They are indispensable in a large number of high-end strict ...

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Problems solved by technology

[0005] In addition, after searching the existing technical literature, it is found that the core technical bottleneck of the current digital filter lies in its speed and cost. A digital filter with strict response characteristics usually has hundreds to thousands of orders. If it is implemented according to the above typical method or similar methods will consume huge costs

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