Adopt the method that based on equivalent model to qualitatively analyze and fix quantify ration the point that may be bring error in the I-F convert circuit. It's necessary to choose the low input offset voltage integrated operational amplifier for decreasing the error in the part of I/V conversion. The output current meets the requirements. In the part of integrated operational amplifier the factors may bring error consisted of open-loop gain and input resistance and output resistance. The other factors i...
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