Simulink Simulation of Fifth-Order CIC Filter

In the following content, I will present the Simulink simulation process for a fifth-order Cascaded Integrator-Comb (CIC) filter. This serves as an excellent guide for readers with foundational knowledge in digital signal processing and filter design. The implementation begins with input signal sampling and quantization, followed by processing through the CIC filter structure. In Simulink, we will construct the filter using integrator and comb filter components arranged in five cascaded stages, with appropriate decimation/interpolation factors. The simulation includes analysis and visualization of output signals using spectrum analyzers and scope blocks to examine frequency response and time-domain characteristics. Key implementation aspects include configuring differential delay parameters, managing bit growth through internal word-length adjustments, and optimizing filter performance using Simulink's fixed-point tools. Finally, I will explain each step of the process in detail, including the transfer function implementation and frequency response validation, to help readers thoroughly understand the filter's operational principles. This article aims to provide valuable assistance for your signal processing projects!