I have a 5 volt power supply that is from a switched mode type supply from futurlec. This unit gives out +-5V, both which need to be further filtered. I need a really clean output with the lowest AC components possible. I have attached a picture of the signal coming out with 20mV divisions and 5usec time divisions. I tried using simple filter techniques but may have to move up to higher order active filters or something. I'm also considering a zener diode regulator in which I would lose a few volts which is not ideal. Does anyone know of an easy or accurate way to clean this up. Any input is greatly appreciated!