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Current source for the generation of electrical currents in the range below 10 microamperes
Current source for the generation of electrical currents in the range below 10 microamperes
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机译:电流源,用于产生低于10微安的电流
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摘要
A current source (2) for the generation of electrical currents in the range below 10 microamperes, with a current feed point (4) between a first resistor (6) and a second resistor (8) is arranged, wherein resistance value of the first resistor (6) at least 100 times greater than a resistance of the second resistor (8), a current output (10), on which a through the first resistor (6) flowing current can be picked off, and on which a signal to be calibrated device (12) can be connected, a first operational amplifier (14), whose non-inverting input (14ni) with a ground (20) is connected, whose inverting input (14i) with the second resistor (8) is connected and the one hand by the second resistor (8) current flowing together with a negative feedback resistor (13) which converts into a voltage, a voltage output (18) at which the first operational amplifier (14) is made available at the voltage is picked up and can be measured, is distinguished by a second operational amplifier (16), whose non-inverting input (16ni) with the ground (20) is connected and whose inverting input (16i) with the current output (10) is connected and a ground connection (22) with the output (16A) of the second operational amplifier (16), from.
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机译:布置用于产生低于10微安的电流的电流源(2),在第一电阻器(6)和第二电阻器(8)之间具有电流馈送点(4),其中第一电阻器的电阻值电阻(6)比第二电阻(8)的电阻大至少100倍,电流输出(10)可以从中流过流过第一电阻(6)的电流,并在其上输出如果要连接校准设备(12),则连接第一运算放大器(14),其同相输入(14 ni Sub>)与地(20)的同相输入,其反相输入(14 i Sub>)与第二电阻器(8)连接,并且一方面第二电阻器(8)的电流与负反馈电阻器(13)一起流动,该负反馈电阻器转换成电压,电压输出(18)在第二个运算放大器的作用下,第一运算放大器(14)在电压被拾取和测量时可用。放大器(16),其同相输入(16 ni Sub>)与地(20)连接,并且其反相输入(16 i Sub>)与电流输出(10) )与第二个运算放大器(16)的输出(16 A Sub>)相连,并且接地连接(22)。
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