I am now doing a project to measure the phase difference in my circuit. Figure 1 is my circuit. My target is to know the phase difference between the output of the DAC and the input of the ADC. I have known the phase of the output of the DAC, phase shift of the analogue circuit and that the modulator has no phase shift. And the output signals from the DAC is lower than 20kHz.
My questions are:
what phase shift would the SMA connector cause normally?(SMA connector is 5-1814400-1 from TE connectivity) And
How about the RF port? What phase shift would it cause?
Does anyone have idea about my questions or idea about how can I solve the problems? (I will try my best to update all information in need)
Thank you very much!
The cable between the SMA and RF port is about 30cm long. But I can`t find any more detail about it. The modulator and analogue circuit are connected through fibre and PD. The analogue circuit, SMA connector and MCU are inside one PCB board.