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发明授权
CN107918428B 一种具有背景电流消除功能的快速扫描电路 有权

一种具有背景电流消除功能的快速扫描电路
摘要：
本发明公开了一种具有背景电流消除功能的快速扫描电路，包括交流电源、第一运算放大器、第二运算放大器、第三运算放大器、第四运算放大器、电化学池、第一电阻、第二电阻、第三电阻、第四电阻、第五电阻、第六电阻、第七电阻、第八电阻、第九电阻、第十电阻、第一滑动变阻器、第二滑动变阻器和第一电容，第三运算放大器、第二变阻器、第十电阻和第一电容构成背景电流补偿产生电路，第四运算放大器、第六电阻、第七电阻、第八电阻和第九电阻构成背景电流消除电路；优点是不管扫描频率的如何提高，其背景电流都会被消除掉，不会对法拉第电流造成干涉和影响，提高了输出电压的信噪比，提高了扫描电路的检测灵敏度。
摘要（英）：

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.

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