The QPO-1ZL and QPO-2LZ are output ripple attenuators, which uses active filtering to reduce power supply output ripple and noise (PARD) over 30 dB from 1 kHz to 500 KHz. The QPO-1LZ operates over a voltage range from 3 to 30 Vdc and supports load currents as high as 10 A. The QPO-2LZ operates over a voltage range from 0.3 to 5.5 Vdc and supports load currents as high as 20 A. Output regulation is maintained using remote sensing or the trim input of the power supply. The QPO architecture improves transient response and ensures quiet point-of-load regulation. The QPO reduces the required number of output capacitors to support dynamic loads.