Position of LO termination resistors

sinara-hw / Phaser

Quad channel 1GS/s RF generator card with dual IQ upconverter and dual 5MS/s ADC and FPGA in EEM form factor

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Position of LO termination resistors #137

Closed FabianSchwartau closed 1 year ago

FabianSchwartau commented 3 years ago

Hi everyone, I noticed that the termination resistors, which are involved in the LO signals of the TRFs are quite far away from where they should be. This involves the resistors R226A/B, R224A/B, and R225A/B. As far as I currently understand the LO signal may be as high as 4.8 GHz. This results in a wavelength of approximately 10mm and the distance of these resistors to their corresponding input/output is in the same range. This does not seem right.

gkasprow commented 3 years ago

Are you sure you are looking at the newest revision? It was fixed in v1.1

gkasprow commented 3 years ago

Ah, in rev1.1 I fixed the DAC termination resistors. IN the case of TRF, look how it's done on devkit.