PNA-X 放大器噪声系数测试

[{"attributes":{"bold":true},"insert":"测试系统介绍"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"测试环境："},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"PNA-X网络分析仪 N5247B"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"放大器芯片夹具"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"功率计+探头 E4419B+E4413A"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"校准件 85052D"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"电源 E3631A"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"被测件：DF782封装放大器芯"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"频率 50MHz--4GHz"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"增益 12.2dB@1GHz"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"噪声系数 4.5dB@1GHz"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"供电 5V"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":" "},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"夹具及被测件："},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/79ab35627fe46e22.png"}},{"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n整体系统搭建如下：\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/b5339339093b94b4.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n"},{"attributes":{"bold":true},"insert":"测试步骤"},{"insert":"\n1.在N5247B上按Meas案件，选择Noise Figure Cold Source，点击OK进入NF测试界面\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/fbf6465b831b369b.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"2.进入测试界面后设置测试频率10MHz--4GHz及扫描点数100\n"},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/48e478cdcc8a6bb4.png"}},{"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"3.设置功率（Port1输出-20dBm，DUT output 0dBm）\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/78b9f8573b8cd125.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":" \n4.Noise Figure设置"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"噪声接收机选择029（噪声接收机），如果没有029选件，也可以选择标准接收机"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":" "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/005b05f4d2592705.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n5.N5247B的Port1/2都连接好射频线，功率计通过GPIB线连接到N5247B的GPIB0(Controller)，探头E4413A连接到功率计归零校准。之后即可进行校准操作，选择CAL--Other CAL--CAL ALL\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/ccb202902bdce004.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n6.进入噪声系数冷源法校准步骤\n"},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/63fda9270ab28173.png"}},{"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n7.在校准设置里选择使用功率计\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/27c488205b5d677a.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n8.下一步源和接收机衰减器设置默认\n"},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/ed11352667ed65e9.png"}},{"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n9.校准件选择85052D\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/635a5539066c80dc.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n10.功率校准容限默认\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/a2cbf1117c9b8514.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n11.默认，下一步\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/07f14ca4c3f96302.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n12.Port1功率校准\n把E4413A功率探头接到Port1端口的射频线上\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/01c892c1aa4ac286.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n点击measure\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/45cc0580408f9f93.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n进行功率校准\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/327b00d2fb1f5eea.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n13.接收机校准，Port1和Port2对接，通过校准过的Port1对Port2的噪声接收机进行校准\n"},{"attributes":{"color":"#222222"},"insert":" "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/8cc1bf3908268a5c.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"attributes":{"color":"#222222"},"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/28b09e59fdc4282e.png"}},{"attributes":{"color":"#222222"},"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n点击测量进行校准\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/03cf5bb89908c22b.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n14.用校准件分别校准Port1和Port2\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/076883e035780c12.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n点击Finish\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/a9d1371041158ad0.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n15.校准传输，使用直通连接Port1和Port2，点击OK\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/e82bb18a54378bb8.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n16.校准完成\n"},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/bea9a2812cd1e9e0.png"}},{"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n此时，我们可以看到NF基本为0dB的状态（Port1,2对接）\n \n17. 把DUT放到夹具里，压紧，电源E3631A输出5V,即可测得放大器芯片的噪声系数和增益\n噪声系数测量\nDUT起始频率是50MHz，可以测得1GHz时NF值为4.67dB（在2.4GHz左右有两个尖峰是因为被测件及夹具未放置在屏蔽箱内，有外界干扰信号影响,也会导致噪声接收机过载）\n"},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/4bcade9efafe5c5e.png"}},{"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"\n增益测量\n测得DUT在1GHz时，增益为12.33dB\n——作者 君鉴科技/ sheeran"},{"attributes":{"align":"right"},"insert":"\n"},{"insert":"\n"}]