Fast scanning circuit with background current eliminating function

Abstract

The invention discloses a fast scanning circuit with the background current eliminating function. The fast scanning circuit comprises an alternating-current power source, a first operational amplifier, a second operational amplifier, a third operational amplifier, a fourth operational amplifier, an electrochemical cell, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first slide rheostat, a second slide rheostat and a first capacitor, a background currentcompensation generating circuit is formed by the third operational amplifier, the second rheostat, the tenth resistor and the first capacitor, and a background current eliminating circuit is formed bythe fourth operational amplifier, the sixth resistor, the seventh resistor, the eighth resistor and the ninth resistor. The fast scanning circuit has the advantages that no matter how the scanning frequency is improved, background currents are eliminated and do not cause interference or influence on Faradic currents, the signal to noise ratio of output voltage is increased, and the detection sensitivity of the scanning circuit is improved.

Description

technical field [0001] The invention relates to a fast scanning circuit, in particular to a fast scanning circuit with background current elimination function. Background technique [0002] Voltammetry examines the electrochemical properties of the system under study by changing the scanning rate of the electrode potential, and can be used for cyclic scanning to obtain reverse information that cannot be obtained by other electrochemical techniques. It is a commonly used electrochemical technique at present. Voltammetry can conveniently provide the thermodynamic parameters of the redox process of chemical or biochemical species, and can also directly gain insight into the kinetic information of various electrochemical reactions, such as: determining the heterogeneous electron transfer rate constant of the system, investigating the multi-step process of the system Electron transfer process, detecting the production and reaction of reaction intermediates and studying the accomp...

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Problems solved by technology

from Figure 2(a) ~ Figure 2(d) It can be seen that with the increase of the scanning frequency, the background current increases continuously; while the Faraday current which depends on the characteristics of the solution does not increase with the increase of the scanning voltage frequency, which leads to the decrease of the signal-to-noise ratio of the output voltage. reduces the sensitivity of the circuit

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