【正文】 103 傳感器 .......................................................................................................................................111 常用傳感器介紹 .............................................................................................................111 超聲傳感器及其應用 .....................................................................................................115第 3 章 典型應用電路 .....................................................................................................................120 限幅放大電路 ...........................................................................................................................120 運放參數測試電路 ...................................................................................................................121 運放參數測量介紹 .........................................................................................................122 輔助運放法通用測量電路設計 .....................................................................................123 鎖相技術原理與應用 .................................................................................................................125 鎖相環(huán)概述 .....................................................................................................................125 鎖相環(huán)應用舉例 .............................................................................................................126 集成鎖相環(huán)芯片介紹 .....................................................................................................127 峰值、有效值測量的模擬實現 ...............................................................................................130 峰值檢波電路 .................................................................................................................130 真有效值檢波 .................................................................................................................131 AGC 電路 ..................................................................................................................................132 場效應管和運放實現 .....................................................................................................132 單片機控制實現 .............................................................................................................133 可變增益放大器實現 .....................................................................................................133 功率放大電路 ...........................................................................................................................137 步進電機的驅動與控制 ...........................................................................................................139 步進電機概述 .................................................................................................................140 步進電機的控制原理 .....................................................................................................140 步進電機的的控制 .........................................................................................................141 步進電機的的驅動電路 .................................................................................................141 手寫板技術及其在單片機系統(tǒng)中的應用 ...............................................................................143 手寫板工作原理 .............................................................................................................144 手寫板解碼 .....................................................................................................................144 手寫板與單片機的硬件連接 .........................................................................................1453 手寫板實現的軟件設計 .................................................................................................146 手寫板功能擴展 .............................................................................................................147第 4 章 典型應用技術 .....................................................................................................................149 頻率合成與 DDS ......................................................................................................................149 信號產生方案與原理 .....................................................................................................149 DDS 理論設計 ................................................................................................................150 DDS 實現 ........................................................................................................................151 等精度頻率計的實現 ...............................................................................................................152 頻率測量方案 .................................................................................................................152 相關計數測頻法的實現 .................................................................................................153 寬帶高精度測頻的實現 .................................................................................................153 相位測量技術 ...........................................................................................................................154 波形分析法 .....................................................................................................................155 相位～電壓轉換法 .........................................................................................................155 計數法 .............................................................................................................................156 相位測量的實現 .............................................................................................................157 峰值、有效值測量的數字實現 ...............................................................................................158 數字法實現峰值測量原理 .............................................................................................158 數字法實現有效值測量原理 .........................................................................................159 峰值/有效值測量小結 ............