And what is it in the kHz and MHz range ?
When I simulate @ DC it is not 50 OHms
Jos
Op 20-1-2020 om 11:55 schreef erik@...:
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Calculated a somewhat different resistor configuration.
Shorted R13 and replaced:
R22: 240 ohm
R23: 240 ohm
R24: 56 ohm
R25: 75 ohm
The CH1 dynamic range at 1.5GHz is now better than 40dB and the mismatch vs Z0 is reduced. As the layout is not improved (can't do that by changing resistors) the performance of the real v3.4 HW is still better
Do NOT be tempted use a resistor configuration with zero ohm R23 to have a single ended input to the CH1 SA612 as that will destroy your dynamic range (believe me, I tried)
Hz
