论文部分内容阅读
在通信传输设备的抖动性能测试中，常用的抖动调制振荡器一般由模拟器件构成，其产生抖动的范围为：频率２０Ｈｚ～２０ｋＨｚ，幅度小于１０ＵＩ。然而，随着ＳＤＨ的发展，ＳＤＨ和ＰＤＨ将在一段时期内共存，在测试ＰＤＨ设备时可能需要更低频率或更高抖动值的抖动，上述仪器便无能为力。本文将介绍一种实用的全数字化的抖动调制振荡器，其时钟标称频率２．０４８ＭＨｚ，抖动频率１～２０Ｈｚ，抖动幅度１～６４ＵＩ。
In the communication transmission equipment jitter performance test, commonly used jitter modulation oscillator is generally composed of analog devices, the jitter generated by the range: frequency 20Hz ~ 20kHz, amplitude less than 10UI. However, with the development of SDH, SDH and PDH will coexist for a period of time, and the above instruments can not do anything when testing PDH equipment may require jitter of lower frequency or higher jitter value. This article will introduce a practical all-digital jitter modulation oscillator, the clock nominal frequency of 2.048MHz, jitter frequency of 1 ~ 20Hz, jitter amplitude of 1 ~ 64UI.