Published:2011/7/6 5:08:00 Author:Lucas | Keyword: Current conversion , voltage conversion , FET | From:SeekIC
In the circuit, FET tube can switch feedback resistor Rf according to the size of the measured current to make output voltage be the specified value. The input signal is swicthed from DC signal to the lKHz AC signal with conversion accuracy in 0.1%. The accuracy of the feedback resistor and open-loop gain of Al affects the conversion accuracy. Al uses LF356, when the frequency is 1KHz, its open-loop gain is 3x1Ox1Ox1O to reach 0.1% conversion accuracy completely. A, B, C, D are switching control signal input ends.
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