Current measurement circuit, current measurement method and nanopore sequencing device

A current measurement circuit, comprising:

• an amplification unit, electrically connected to a sensor unit and configured to amplify an electrical signal from the sensor unit;
• a comparison unit, electrically connected to the amplification unit and configured to:
• output a high level under a condition that a voltage signal output by the amplification unit is greater than a preset voltage, and output a low level under a condition that the voltage signal output by the amplification unit is less than the preset voltage, to obtain an initial pulse signal;
• a delay unit, electrically connected to the comparison unit and configured to delay an output of the initial pulse signal to obtain a target pulse signal;
• a resistance unit, wherein two terminals of the resistance unit are electrically connected to an input terminal of the amplification unit and an output terminal of the delay unit respectively, and the resistance unit is configured to feed back charging and discharging currents to the amplification unit based on the target pulse signal;
• and
• a calculation unit, electrically connected to the delay unit and configured to calculate a target current based on the target pulse signal output by the delay unit, wherein the target current is a current flowing through the sensor unit,
• wherein the calculation unit is configured to calculate the target current based on the target pulse signal output by the delay unit by:
• calculating the target current based on a frequency and a duty cycle of the target pulse signal output by the delay unit;
• or
• performing moving average calculation based on the target pulse signal output by the delay unit to obtain a value of the target current.