集成LCoS芯片内的可编程多通道参考电压产生器

摘要

Integrated reference voltage generator in LCoS(Liquid Crstal on Silicon) display chip can produce more accurate reference voltage, wireless of LCoS screen interface, lower power consumption and higher reliability of the overall LCoS display system, and so on. This paper proposes a design of programmable multiple reference voltage generator integrated in LCoS chip, analyses the role of the reference voltage in LCoS display system, and gives part circuits of schematic, layout, lower-power method. The whole circuit is composed of I2C interface circuit, multi-channel registers, control circuit, multi-channel DAC(Digital to Analog Convertor) and multi-channel buffer. This paper focuses on multi-channel DAC and multi-channel buffer of the reference voltage generator. EDA(Electronic Design Automation) design tools are used to complete part of the circuit schematic design and simulation. The CMOS processes of SMIC are used to complete the circuit layout design and follow-up of ERC(Electrical Rules Check), DRC (Design Rule Check),LVS(Lagout Vesus Schematic) inspected and verified. The final results show that the output of the circuit can completely satisfy the requirements of LCoS display.%在LCoS显示芯片内集成参考电压产生器有很多优点,能产生更精确的参考电压、LCOS屏接口的外围引线更少、芯片系统的整体功耗更低、可靠性更高等.提出了集成LCOS芯片内的可编程多通道参考电压产生器的设计,分析了 LCoS 显示系统中参考电压的作用,给出了部分电路的原理图、版图以及电路低功耗的实现方法.整个电路系统有I2C接口电路、多通道寄存器、控制电路、多通道 DAC 以及多通道缓冲器组成.重点介绍了参考电压产生器中多通道 DAC 和多通道缓冲器的设计,并且用EDA设计工具完成了对部分电路原理图的设计和仿真.最后用SMIC CMOS工艺完成了电路版图的设计以及后续的ERC、DRC和LVS检测和验证.最后结果显示此电路系统能够完全满足 LCoS 显示的要求.