High-precision incremental analog-to-digital converter and conversion method thereof

The invention discloses a high-precision incremental analog-to-digital converter and a conversion method thereof. The high-precision incremental analog-to-digital converter comprises an input signal determination unit 100, a logic control unit 200, an analog signal gain amplifier 300, a quantization output unit 400 and a digital code translation unit 500 which are connected in sequence, wherein the logic control unit 200 is connected with the digital code translation unit 500. On the basis that high precision is achieved, integral nonlinearity and differential nonlinearity of the whole incremental sigma-delta analog-digital converter are effectively improved, and the inherent defect that when the incremental sigma-delta analog-digital converter is close to the maximum value and the minimumvalue of the input range, the quantization error is large is overcome. 本发明公开了一种高精度增量型模数转换器及其转换方法，包括：依次连接的输入信号判定单元100、逻辑控制单元200、模拟信号增益放大器300、量化输出单元400和数字码平移单元500，逻辑控制单元200连接数字码平移单元500。在实现高精度的基础上，同时有效的提升了增量型ΣΔ模数转换器整体的积分非线性和微分非