Digital Square-Wave Frequency Modulated Microwave Sources for a Miniature Optically Pumped Cesium Beam Clock

• 来源期刊: 中国电子杂志（英文版）
• 学科: 工学
• 关键词: Cesium beam frequency standard Accuracy of frequency standard Direct digital fre-quency synthesizer Microwave source.
• 年，卷（期）: 2001,（1）
• 页码范围: 125-128
• 页数: 4页
• 分类号: TN
• 语种: 英文

摘要

Three different digital frequencymodulated microwave sources have been designed andapplied to our miniature optically pumped cesiumbeam clock.The main features and their influenceon clock accuracy have been experimentally tested.Itis proved that a digital square-wave frequency modu-lated microwave source using a microprocessor con-trolled direct-digital frequency synthesizer (DDFS)for our miniature optically pumped cesium beamclock works well,the frequency short term stability2 × 10 11/x r and the long term stability 3.5 x 10-13 forone day sample time have been obtained.