电测知识分享——N7010A性能验证

[{"insert":"1. "},{"attributes":{"bold":true},"insert":"关键词（应用技术）"},{"insert":"\n"},{"attributes":{"bold":true},"insert":"N7010A,端接适配器，数字测试"},{"insert":"\n\n2. "},{"attributes":{"bold":true},"insert":"摘要"},{"insert":"\n"},{"attributes":{"color":"#262626"},"insert":"Keysight N7010A 有源端接适配器是一款 30 GHz 单端适配器，具有用户可调节的公共端接电压（VTERM）和超低的噪声。适用于 HDMI 2.0、DisplayPort 和 MIPI M-PHY Gear 3/4 等应用。 示波器可以内部控制端接电压，使其保持在 -4.0 V 至 +4.0 V 之间。 "},{"insert":"\n3. "},{"attributes":{"bold":true},"insert":"测试系统搭建"},{"insert":"\n3.1. 仪器/附件/软件清单\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/f0ff2815548395f4.png"}},{"attributes":{"align":"center"},"insert":"\n\n"},{"insert":"3.2. 连接示意图\n"},{"attributes":{"color":"#000000","bold":true},"insert":"带宽测试"},{"attributes":{"align":"center"},"insert":"\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/daa92bdef53eb2d0.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"attributes":{"color":"#000000","bold":true},"insert":"DC 电阻测试"},{"attributes":{"align":"center"},"insert":"\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/5cc20ddf5e5fa2fa.png"}},{"attributes":{"align":"center"},"insert":"\n\n"},{"insert":"4. "},{"attributes":{"bold":true},"insert":"测试步骤"},{"insert":"\n4.1. 连接设备仪器\n"},{"attributes":{"color":"#ff0000"},"insert":"连接好的场景图如下图所示。"},{"insert":"\n带宽测试"},{"attributes":{"align":"center"},"insert":"\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/fb753d3c1fa11932.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"DC电阻测试"},{"attributes":{"align":"center"},"insert":"\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/2c40dc3d282e0d26.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"attributes":{"bold":true},"insert":" "},{"insert":"\n4.2. 操作步骤\nDC 电阻测试\n1) 按图示连接好测试环境。N7010A接到DSAV334A的CH1上，再通过3.5mm射频线连出来。\n2) 万用表调到欧姆档，N7010A通过射频线连接到T型香蕉头接入万用表\n3) 记录此时万用表读数为R1=48.2Ω\n4) 把香蕉头正负和万用表接头反接，记录万用表读数为R2=52.9Ω\n5) 计算平均输入电阻值R\nR=(R1+R2)/2=(48.2+52.9)/2=50.55Ω\n6) 验证规格参数\n\t48.5Ω≤R≤51.5Ω\n7) DC 平均输入电阻值符合规范参数要求\n\n带宽测试\n1) N7010A探头校准。N7010A连接到DSAV334A的CH1,通过射频线连接到示波器的CAL OUT端口。示波器SETUP—Channel1---Probe Cal，进行N7010A校准,并完成校准。\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/83ff73e4c15bd9da.png"}},{"attributes":{"align":"center"},"insert":"\n\n"},{"attributes":{"color":"#000000"},"insert":"2) 功率计探头归零校准"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"N1911A+N1922A归零校准，并把单位改成W"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"3) 按照带宽测试示意图连接好测试系统"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"4) 信号源E8257D，输出F=50MHz，Amp=-4dBm的CW信号，并打开输出"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"5) DSAV334A恢复默认设置，Default Setup，然后打开CH1,设置纵轴和横轴刻度"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"Vertical scale (Channel 1):50 mV/div"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"Horizontal scale: 16 ns/div (display 8 cycles of a 50 MHz waveform)"},{"insert":"\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/462f6f7086eab6ce.png"}},{"attributes":{"align":"center"},"insert":"\n\n"},{"attributes":{"color":"#000000"},"insert":"6) 添加测量项（RMS）"},{"insert":"\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/05e8edd0bc8e5503.png"}},{"attributes":{"align":"center"},"insert":"\n\n"},{"attributes":{"color":"#000000"},"insert":"7) 读取示波器测量值Vout=69.3 mV"},{"insert":"\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/a4976adb87241c9c.png"}},{"attributes":{"align":"center"},"insert":"\n\n"},{"attributes":{"color":"#000000"},"insert":"8) 读取功率计测量值Pmeas=96.4uW并计算Vin"},{"insert":"\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/385fdc9834bed9ad.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/4d19b9a8323c9e4b.png"}},{"attributes":{"align":"center"},"insert":"\n\n"},{"attributes":{"color":"#000000"},"insert":"Vin = (96.4 x 10-6 X 50Ω)1/2=69.4 mV"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"9) 计算50MHz时的Gain"},{"insert":"\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/85e6fdaa1b01310d.png"}},{"attributes":{"align":"center"},"insert":"\n\n"},{"attributes":{"color":"#000000"},"insert":"Gain（50MHz）=Vout/Vin=69.3/69.4=0.998"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"10) 把PSG的频率改成30GHz，功率计频率也改成30GHz，读取此时的功率计测量值Pmeas=41uW"},{"insert":"\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/c2bf7cb16ac4756c.png"}},{"attributes":{"align":"center"},"insert":"\n\n"},{"attributes":{"color":"#000000"},"insert":"计算Vin= (41 x 10-6 X 50Ω)1/2=45.3 mV"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"11) 更高示波器横轴刻度为50ps"},{"insert":"\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/a9585d8a50b150a1.png"}},{"attributes":{"align":"center"},"insert":"\n\n"},{"attributes":{"color":"#000000"},"insert":"12) 读取RMS测量值Vout=50 mV"},{"insert":"\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/b9f2c9e6b96f2b80.png"}},{"attributes":{"align":"center"},"insert":"\n\n"},{"attributes":{"color":"#000000"},"insert":"13) 计算30GHz时N7010A的Gain值"},{"insert":"\n"},{"insert":{"image":"https://files.eteforum.com/article/202306/0f4cdc5193cf61a7.png"}},{"attributes":{"align":"center"},"insert":"\n\n"},{"attributes":{"color":"#000000"},"insert":"Gain（30GHz）=20Lg[(50/45.3)/0.998 ]=0.83dB"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"14) 验证-3 dB带宽规格参数"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"Gain（30GHz）>-3Db"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"符合各个参数要求"},{"insert":"\n"},{"attributes":{"align":"right"},"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"——作者 君鉴科技/付飞黄"},{"attributes":{"align":"right"},"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"——来源 每日E问eteforum"},{"attributes":{"align":"right"},"insert":"\n"}]