分析了調(diào)幅信號(hào)和載波信號(hào)之間的相位差與調(diào)制信號(hào)的極性的對(duì)應(yīng)關(guān)系,得出了相敏檢波電路輸出電壓的極性與調(diào)制信號(hào)的極性有對(duì)應(yīng)關(guān)系的結(jié)論。為了驗(yàn)證相敏檢波電路的這一特性,給出3 個(gè)電路方案,分別選用理想元件和實(shí)際元件,采用Multisim 對(duì)其進(jìn)行仿真實(shí)驗(yàn),直觀形象地演示了相敏檢波電路的鑒相特性,是傳統(tǒng)的實(shí)際操作實(shí)驗(yàn)所不可比擬的。關(guān)鍵詞:相敏檢波;鑒相特性;Multisim;電路仿真
Abstract : The corresponding relation between modulation signal polarity and difference phases of amplitudemodulated signal and the carrier signal ,the polarity of phase2sensitive detecting circuit output voltage and the polarity of modulation signal are correspondent . In order to verify this characteristic ,three elect ric circuit s plans are produced ,idea element s and actual element s are selected respectively. Using Multisim to carry on a simulation experiment ,and then demonst rating the phase detecting characteristic of the phase sensitive circuit vividly and directly. Which is t raditional practical experience cannot be com pared.Keywords :phase sensitive detection ;phase2detecting characteristic ;Multisim;circuit simulation
