基于TSMC 0.25μm CMOS工艺,采用分段开关电流结构,设计了一种基于2.5 V电源电压的14位400 MS/s D/A转换器。该D/A转换器内置高精度带隙基准源、高速开关驱动电路和改进的Cascode单位电流源电路,以提高性能。D/A转换器的积分非线性(INL)和微分非线性(DNL)均小于0.5 LSB。在400 MHz采样频率1、99.8 MHz输出信号频率时,其无杂散动态范围(SFDR)达到85.4 dB。 Based on the TSMC 0.25μm CMOS process, a 14-bit 400 MS / s D / A converter based on a 2.5 V supply voltage is designed using a segmented switching current architecture. The D / A converter includes a high-precision bandgap reference, high-speed switch driver, and an improved Cascode unit current-source circuit for improved performance. The D / A converter has an integrated nonlinearity (INL) and differential non-linearity (DNL) of less than 0.5 LSB. Its Spurious-Free Dynamic Range (SFDR) reaches 85.4 dB at a 1,99.8 MHz output signal frequency at a 400 MHz sampling frequency.