低噪声空间光调制器电流开关网络结构的研究

Research on Low-Noise Current-Switching Network Structure for Spatial Light Modulator

提出了一种基于开关电容积分电路、用于多量子阱空间光调制器驱动电路的电流开关网络结构。通过改变开关网络结构及调整开关尺寸,在保持开关电容电路结构简单、功耗低等优点的同时,克服了MOS管开关非理想特性带来的开关噪声,提高了输出精度。仿真结果表明,新型电流开关网络结构将开关开启、关断造成的尖峰电流从几十个微安降低到几个微安,有效抑制了噪声影响,极大地提高了输出精度,完全符合多量子阱空间光调制器的要求。

A new current-switching network structure, which is based on the switched-capacitor circuits and applied in the driving circuit of multi-quantum-well （MQW） spatial light modulator （ SLM）, is pro- posed in this paper. By modifying the network structure and readjusting the switch size, it not only keeps the simplicity of the structure and low-power consumption, but also declines the switching noise and in- crease output precision. It can be seen from the simulation results, that the new current-switching net- work structure reduces peak current from tens of μA reduced to several ~A. whereby the noise impact can be effectively suppressed and the output precision can also be greatly improved, which completely meets the requirements of MQW spatial light modulator.