Current front-end wide-dynamic low-noise amplification circuit of ADC (Analog to Digital Converter) sampling module
The invention discloses a current front-end wide-dynamic low-noise amplification circuit of an ADC sampling module, which comprises a current transformer circuit, a primary filter circuit, an operational amplifier circuit and a noise reduction circuit, and is characterized in that the transformation...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The invention discloses a current front-end wide-dynamic low-noise amplification circuit of an ADC sampling module, which comprises a current transformer circuit, a primary filter circuit, an operational amplifier circuit and a noise reduction circuit, and is characterized in that the transformation ratio of a current transformer of the current transformer circuit is greater than a first ratio; the primary filter circuit is in circuit connection with the current transformer through an external resistor, the primary filter circuit is formed by connecting a first resistor and a first capacitor in series, and the resistance value of the first resistor is set above a preset resistance threshold value; the operational amplifier circuit is connected with the primary filter circuit and comprises an operational amplifier, and a second resistor and a second capacitor which are connected in parallel with the operational amplifier, and the resistance ratio of the second resistor to the first resistor is greater than or |
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