So the delay through the connector is about 23 ps. The dielectric constant of the PTFE (Teflon) material in the SMA connector is about 2.0. The length of the signal path is maybe 5 mm. The analogue circuit, SMA connector and MCU are inside one PCB board.Īt 20 kHz, the phase shift of the SMA connector is negligible. The modulator and analogue circuit are connected through fibre and PD. But I can`t find any more detail about it. The cable between the SMA and RF port is about 30cm long. Simulate this circuit – Schematic created using CircuitLab (I will try my best to update all information in need) How about the RF port? What phase shift would it cause?ĭoes anyone have idea about my questions or idea about how can I solve the problems? What phase shift would the SMA connector cause normally?(SMA connector is 5-1814400-1 from TE connectivity) And And the output signals from the DAC is lower than 20kHz. 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. My target is to know the phase difference between the output of the DAC and the input of the ADC. I am now doing a project to measure the phase difference in my circuit.
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