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高通可編程濾波器硬件基礎(chǔ)結(jié)構(gòu)

更新時(shí)間:2025-08-19      點(diǎn)擊次數(shù):157
  高通可編程濾波器是一種結(jié)合了數(shù)字信號處理(DSP)技術(shù)和模擬電路設(shè)計(jì)的先進(jìn)器件,其核心優(yōu)勢在于能夠通過軟件配置實(shí)現(xiàn)不同頻率響應(yīng)特性的動(dòng)態(tài)調(diào)整。以下是其作用原理的詳細(xì)解析:
  一、高通可編程濾波器硬件基礎(chǔ)結(jié)構(gòu)
  1.輸入接口模塊
  接收原始模擬信號或已數(shù)字化的采樣數(shù)據(jù)流;
  包含抗混疊低通濾波器(Anti-Aliasing LPF),抑制高于奈奎斯特頻率的成分以避免頻譜混疊。
  2.可編程邏輯單元(PFU)
  由現(xiàn)場可編程門陣列(FPGA)、專用集成電路(ASIC)或微控制器(MCU)構(gòu)成;
  根據(jù)預(yù)設(shè)算法實(shí)時(shí)計(jì)算濾波系數(shù),并控制后續(xù)處理流程。
  3.數(shù)字乘法累加器(MAC Array)
  實(shí)現(xiàn)有限脈沖響應(yīng)(FIR)結(jié)構(gòu)的卷積運(yùn)算,每個(gè)抽頭延遲線對應(yīng)一組權(quán)重參數(shù);
  典型配置支持64~1024階抽頭,決定過渡帶陡峭度和阻帶衰減深度。
  4.數(shù)模轉(zhuǎn)換器(DAC)及重建電路
  將處理后的數(shù)字結(jié)果轉(zhuǎn)換為模擬信號;
  配備平滑濾波器消除量化噪聲和鏡像頻率分量。
  二、高通可編程濾波器工作原理分步詳解
  步驟1:信號采集與預(yù)處理
  采樣定理遵循:以至少兩倍最高感興趣頻率的速度對連續(xù)時(shí)間信號進(jìn)行離散化;
  直流偏移校正:通過高分辨率ADC檢測并去除共模電壓干擾;
  自動(dòng)增益控制(AGC):動(dòng)態(tài)調(diào)整輸入幅度至最佳信噪比區(qū)間。
  步驟2:數(shù)字域?yàn)V波實(shí)現(xiàn)-采用兩種主流算法架構(gòu):
  1FIR濾波機(jī)制
  其中h[k]為預(yù)先設(shè)計(jì)的沖激響應(yīng)序列;
  優(yōu)點(diǎn):嚴(yán)格線性相位特性保證各頻率成分延遲一致,避免波形失真;
  2IIR遞推結(jié)構(gòu)
  通過反饋回路實(shí)現(xiàn)無限長沖激響應(yīng);
  優(yōu)勢:較低階數(shù)下即可達(dá)到尖銳滾降特性,適合資源受限場景;
  注意點(diǎn):需謹(jǐn)慎處理穩(wěn)定性問題,防止極點(diǎn)移出單位圓導(dǎo)致振蕩。
 

 

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