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中文摘要：
基于电容积分法测量原理，利用32位微控制器STM32F103控制双通道双切换积分（Dual Switched Integrator）芯片DDC112，配合电路防泄漏电流工艺设计，实现双通道fA（飞安10^-15A）级微弱电流的连续测量。利用单芯片DDC112实现I/V转换，并提供20位数字输出，使系统具有电路简化，分辨率高，干扰噪声低等特点。该系统测量分辨率达到1fA，测量时间范围：50～1×10^6 us，电流量程可在5×10^4-7×10^9fA范围内通过设置积分时间进行选择。
英文摘要：
Based on the capacitor-integration measurement method, control the dual channel and dual switched integrated chip DDC112. leakage current, it realized double channel fA （fei ampere 10 the STM32 series microcontroller was used to Coordinate with the process design for Anti- 15 A） level of the current weak consecutive measurements. By using a single chip DDC112 to realize I/V switching and providing 20 digital output, the system is with simplified circuit, high resolution, low noise interference characteristics. The system measurement resolution achieves lfA measuring time range is 50-1×10^6 us , and current range can be set up in the range of 5×10^4 -7×10^9 fA by setting the integral time.
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