研究三角形取樣鑒相數(shù)字合成器鎖相環(huán)中的混沌現(xiàn)象。其方法是先對三角形取樣鑒相數(shù)字合成器鎖相環(huán)系統(tǒng)作離散化處理，得到相應(yīng)的離散化系統(tǒng)模型；系統(tǒng)中的環(huán)路濾波器采用RC積分濾波器, 鑒相器采用三角形鑒相特性；通過驗(yàn)證離散化系統(tǒng)相應(yīng)的低維系統(tǒng)存在快返反射點(diǎn)，證明了當(dāng)系統(tǒng)方程滿足一定條件時(shí)，原系統(tǒng)有混沌輸出。最后導(dǎo)出了混沌與系統(tǒng)參數(shù)間的關(guān)系式。Chaos phenomenon of sampling phase-detector digital synthesizer loop is studied. First, the systems of sampling phase-detector digital synthesizer loop is discretization handled and the discretization systems model is given. In this systems, loop filter is RC integral filter and phase-detector is triangle phase-detector characteristic. By verifing the corresponding lower dimension system of discretization systems has the Snapnack Repeller, it is proof that original system output chaos when certain conditions of system parameters are satisfied. The relation between chaos and the parameter of the system is given finally.