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.
Claims17
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.
A calibration arrangement of a radiometer, the calibration arrangement comprising an active noise source apparatus 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.
An active noise source apparatus, comprising:
- a first switched-biased noise amplifier branch,
- a second switched-biased noise amplifier branch, 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 an output of the active noise source apparatus, and wherein the output of the active noise source apparatus comprises a ground-signal-ground, GSG, contact pad, and a shunt transmission line is connected parallel with a capacitance of the GSG contact pad.
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 apparatus, and
- a noise power control arranged to adjust amplification of the first and second switched-biased noise amplifiers based on a noise power level monitored at the matched termination.
Dependencies are inferred from the claim text.