集成电路与嵌入式系统2025，Vol.25Issue(2)：16-25,10.DOI:10.20193/j.ices2097-4191.2024.0075
基于MO-TFT工艺的8位32 kS/s电流舵DAC
An 8-bit 32 kS/s current-steering DAC based on MO-TFT
摘要
Abstract
In this paper,an 8-bit current-steering Digital to Analog Converter(DAC)based on Metal Oxide Thin Film Transistor(MO-TFT)technology is designed,which includes a timing refresh module,a synchronous register circuit,a segmented decoding circuit,a switch driver circuit,a switch array and a current source array,a multiplexer network,and a random sequence generator.The timing refresh structure is designed in the digital circuit to solve the traditional bootstrap logic gate charge leakage caused by the current source switch driving voltage drop,to avoid the problem of sampling errors in low frequency signals.A differential dual decoding structure is proposed,so that the open and close signals could reach the switch driver circuit at the same time,ensuring the symmetry of the voltage rise and fall Windows in the driver circuit and reduced the output glitter.Meanwhile,the D flip-flop in the digital circuit and the logic gate in the decoder circuit are used to implement the driver enhancement circuit,guaranteeing the high bit unit current source in the ana-log circuit can be driven and the conversion rate is improved.Dynamic Elements Matching(DEM)technique is employed to improve the dynamic performance of DAC.The poster-simulation results show that the designed DAC has an area of 73 mm2,a power consumption of 6.5 mW,an output current swing of 301.46 μA,a maximum conversion rate of 32 kS/s.Under the condition that the standard devi-ation of the random matching error of the unit current source is 0.1,the Spurious-Free Dynamic Range(SFDR)at the Nyquist frequen-cy can reach 42.43 dB,the maximum Differential Nonlinearity(DNL)is 0.36 LSB,and the maximum Integral Nonlinearity(INL)is 1.75 LSB,meeting the requirements of flexible electronic systems for biomedical applications.关键词
MO-TFT/电流舵/DAC/非晶铟化镓TFTKey words
MO-TFT/current steering/DAC/Amorphous Gallium-Indium-Zinc-Oxide TFT分类
信息技术与安全科学引用本文复制引用
欧逸怡,李斌,吴朝晖,赵明剑..基于MO-TFT工艺的8位32 kS/s电流舵DAC[J].集成电路与嵌入式系统,2025,25(2):16-25,10.基金项目
国家自然科学基金面上项目(62174058). （62174058）
