Noise at AD2 power supply output

[Bjarne Skipper]

Having much benefits using the AD2 during many years, I have now discovered that the power supply outputs having significant switching noise which depends on the output voltage and load at the power supplies! Unloaded it is wellknown that DC-DC power supplies can be pulse skipping and thereby cause low frequency switching noise. 

But even with reasonable loads the noisy behavior are still significant! Hereby a couple of measurements:

Ch1: positive supply Ch2: negative supply

Is it possible to reduce/remove this power supply noise? (Except of cause by heavy LP filtering).

BR Bjarne

500mV, -500mV

 

1000mV, -1000mV

 

900mV, -900mV

 

1500mV, -1500mV

Edited February 16, 2022 by Bjarne Skipper