METHOD OF REDUCING INTERNAL NOISE OF PRECISION AMPLIFIER OF ELECTRICAL SIGNAL Russian patent published in 2025 - IPC G01P15/00 G01R29/26 H03F1/26 

FIELD: radio engineering.

SUBSTANCE: invention relates to radio engineering and, in particular, to methods of developing highly sensitive ultra-low-noise precision amplifiers of analogue signals, and can be used in designing equipment for studying microfluctuations in various physical and chemical systems. Purpose of the invention is to reduce the level of self-noise voltage (SNV) of a combined amplifier composed of two identical components of amplifiers, the inputs of which are mutually connected in parallel and are the input of the combined amplifier, and the outputs are connected to a summing device, the output of which is the output of the combined amplifier. Technical result is achieved by introducing into the summation process a special matching weight coefficient for each component amplifier, the value of which must be inversely proportional to the level of its squared SNV.

EFFECT: reducing the SNV in the combined amplifier to the maximum possible level taking into account the inevitable divergence of the SNV in the component amplifiers; maintaining the efficiency of the method regardless of the degree of divergence of the SNV of the components of the amplifiers, including when the critical value is exceeded by more than √3 times; elimination of the need for special selection of components of amplifiers based on small discrepancy of levels of SNV.

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