Patent ID: 11953535
Assignee: TEKNOLOGIAN TUTKIMUSKESKUS VTT OY
Field: Basic communication processes (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An active noise source apparatus, comprising:
a first switched-biased noise amplifier branch, comprising a first noise amplifier having a switched biasing, and a first noise-generating device connected to supply a first pure noise signal to an input of the first noise amplifier,
a second switched-biased noise amplifier branch, comprising a second noise amplifier having a switched biasing, and a second noise-generating device connected to supply a second pure noise signal to an input of the second noise amplifier, and
a directional coupler having a pair of input ports connected to combine noise outputs from the first and second switched-biased noise amplifiers, one output port of the directional coupler being connected to a matched termination and another output port of the directional coupler being connected to supply an amplified noise signal to an output of the apparatus, the apparatus being configured to be an active noise source.