研究三角形取樣鑒相數字合成器鎖相環中的混沌現象。其方法是先對三角形取樣鑒相數字合成器鎖相環系統作離散化處理，得到相應的離散化系統模型；系統中的環路濾波器采用RC積分濾波器, 鑒相器采用三角形鑒相特性；通過驗證離散化系統相應的低維系統存在快返反射點，證明了當系統方程滿足一定條件時，原系統有混沌輸出。最后導出了混沌與系統參數間的關系式。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.