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[问答]

E4438C和N5182A不向后面板I/Q端口输出信号该怎么办?

我使用E4438C作为基带发生器,在基带频率上产生未调制的正弦波。
我希望信号在后面板I / Q端口输出,但不输出信号。
我正在以BB频率(~10MHz)工作,当我使用RF端口时,我的正弦波输出(然后我使用移相器将其分成I和Q,但我想从我的移除移相器
建立)。
当我调制信号(使用ARB波形发生器)时,我在I_out和Q_out端口获得正确的信号。
为了在I_out和Q_out端口启用信号输出,还有什么我需要做的,还是仅保留用于调制信号?
谢谢,大卫

以上来自于谷歌翻译


     以下为原文

  I'm using the E4438C as a baseband generator to generate an unmodulated sine wave at baseband frequencies. I expect the signal to be output at the rear-panel I/Q ports but no signal is output. I'm working at a BB frequency (~10MHz) and when I use the RF port, my sine wave is output (I then use a phase shifter to split it to I and Q, but I want to remove the phase shifter from my setup).
When I modulate the signal (using a ARB waveform generator) then I get the correct signal at the I_out and Q_out ports.
Is there anything I need to do in order to enable signal output at the I_out and Q_out ports, or are they reserved only for modulated signals?

Thanks,
David  

回帖(1)

李欢

2019-8-8 14:23:09
嗨大卫 - 后面板I / Q端口输出I / Q调制信号的模拟同相分量,但它必须来自内部基带发生器。
I / Q端口需要注意的其他事项:该连接器的标称输出阻抗为50Ω,直流耦合。
损坏等级> +3.5 V且DC原点偏移通常为50Ω负载的输出信号电平如下:•0.5 Vpk(典型值)对应于I / Q向量的一个单位长度。
•0.69 Vpk(2.84 dB),π/ 4 DQPSK峰值的典型最大波峰因数,α= 0.5。
•0.71 Vpk(3.08 dB),π/ 4 DQPSK峰值的典型最大波峰因数,α= 0.35。
•通常最大1 Vp-p问候 -

以上来自于谷歌翻译


     以下为原文

  Hi David -

The rear-panel I/Q ports output the analog in-phase component of I/Q modulation signal, but it has to come from the internal baseband generator. 

Other things to take note of on the I/Q ports: 
The nominal output impedance of this connector is 50Ω, DC-coupled. 
The damage levels are > +3.5 V and < −3.5 V. 
The DC origin offset is typically < 10 mV. 
The output signal levels into a 50Ω load are as follows:
• 0.5 Vpk, typical, corresponds to one unit length of the I/Q vector.
• 0.69 Vpk (2.84 dB), typical, maximum crest factor for peaks for π/4 DQPSK with alpha = 0.5.
• 0.71 Vpk (3.08 dB), typical, maximum crest factor for peaks for π/4 DQPSK with alpha = 0.35.
• Typically 1 Vp-p maximum

Regards -
举报

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