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公开(公告)号：US20210270881A1
公开(公告)日：2021-09-02
申请号：US17260825
申请日：2019-07-17
Applicant: TEKNOLOGIAN TUTKIMUSKESKUS VTT OY
Inventor： Mikko VARONEN , Henrik FORSTEN , Jan SAIJETS
Abstract: An active noise source apparatus includes a pair of a first and second switched-biased noise amplifier branches (22, 23). A directional coupler (24) having a pair of input ports (3, 4) connected to combine the noise outputs from the first and second switched-biased noise amplifiers. One output port (4) of the directional coupler (24) is connected to a matched termination (Rtermination) and another output port (2) of the directional coupler (24) is connected to an output (25) of the active noise source.
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