POWER SUPPLY NOISE REDUCTION CIRCUIT AND POWER SUPPLY NOISE REDUCTION METHOD

摘要

A power supply noise reduction circuit and a power supply noise reduction method that do not require a circuit device to be large in size and do not cause a voltage drop of a power supply voltage are provided. A power supply noise reduction circuit (10) for reducing noise included in a constant voltage output from a power supply (2) to a load, comprising: a first resistor (20) inserted in a power supply line (L1) A filter 31 connected to the lower end of the first resistor 20 for outputting a first voltage whose noise is reduced from the constant voltage output, and a second resistor 31 for driving the first voltage outputted from the filter 31, And a unit gain amplifier 32 for outputting the amplified signal to the negative terminal of the amplifier 20.