  Reconfigurable intelligent surface (RIS) is a revolutionary technology to
enhance both the spectral efficiency and energy efficiency of wireless
communication systems. However, most of the existing contributions mainly
focused on the study of passive RIS, which suffers from the ``double fading''
effect. On the other hand, active RIS, which is equipped with amplifiers, can
effectively address this issue. In this paper, we propose an active RIS-aided
simultaneous wireless information and power transfer (SWIPT) system.
Specifically, we maximize the weighted sum rate of the information receivers,
subject to the minimum power received at all energy receivers, amplification
power constraint at the active RIS, and the maximum transmit power constraint
at the base station (BS). By adopting alternating optimization framework,
suboptimal solutions are obtained. Simulation results show that the active
RIS-aided SWIPT system has higher performance gain with the same power budget.
