Active noise source design
AssigneeTeknologian tutkimuskeskus VTT Oy
InventorsMikko VARONEN, Henrik FORSTEN, Jan SAIJETS
Life of this patent
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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.
Claims15
An active noise source apparatus, comprising a first switched-biased noise amplifier branch, a second switched-biased noise amplifier branch, 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 an output of the active noise source.
A calibration arrangement of a radiometer, the calibration arrangement comprising an active noise source apparatus as claimed in arranged to output a broadband noise signal that is injected to an input of the radiometer, the active noise source apparatus further comprising
- a first switched-biased noise amplifier branch,
- a second switched-biased noise amplifier branch,
- 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 an output of the active noise source.
Dependencies are inferred from the claim text.