High-stability and high-precision current source circuit
A high-precision, current source technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of poor current accuracy, unstable output current range, long response time, etc., to improve control accuracy and efficiency. , the effect of high-precision current source output
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[0013] The output terminal of the D / A converter is connected to AGND in series with resistors R1 and R2. When the output voltage Uin of the D / A converter, a voltage U1+=Uin*(R2 / (R1+R2)) will be generated at the connection point between R1 and R2.
[0014] The negative terminal of the first operational amplifier OP1 is connected to the connection point of the resistors R1 and R2. The positive terminal of the first operational amplifier OP1 is divided into two paths, one is connected to AGND through a resistor R3, and the other is connected to the drain of the first field effect transistor V1 to form a positive feedback connection to generate a voltage U1-. The output terminal of the first operational amplifier OP1 is connected to the gate of the first field effect transistor V1. The negative feedback circuit formed by OP1 and V1 makes U1+=U1-, and then I2=U1- / R3=U1+ / R3. Because the first operational amplifier OP1 is a positive feedback connection, the setup time of U1- is shorte...
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