公开(公告)号：US20230155560A1

公开(公告)日：2023-05-18

申请号：US17919784

申请日：2021-04-21

Applicant: ZTE CORPORATION

Inventor： Song CHEN ,  Jie LIN ,  Hao CHEN

IPC: H03G3/30

CPC classification number: H03G3/3036 ,  H03G2201/103 ,  H03G2201/307

Abstract: Provided are automatic level control (ALC) circuit, signal source, method for controlling signal source output power, and storage medium. The ALC circuit includes: at least two stages of ALC loops, each ALC loop including an amplifier, a coupler, a power detector, and an attenuation control module connected sequentially. An output end of an adjustable attenuator is connected to an input node of first stage of ALC loop; an output node of each stage of ALC loop, other than last stage of ALC loop, is connected to a normally on end of a two-way single-on switch, a first gating end of the two-way single-on switch is connected to an input node of a next stage of ALC loop, and the output node of the last stage of ALC loop and a second gating end of each two-way single-on switch are connected to an output end of the ALC circuit.