基于石墨烯探测器的积分电路设计

Integral Circuit Design Based on Graphene Detector

摘要:

为了解决石墨烯探测器光电探测的难题,针对石墨烯探测器受光照像元电阻发生变化的特点,设计了基于石墨烯探测器的新型积分电路结构。该积分电路结构主要包含前端偏置电路、运算放大器以及开关和反馈电容等部分,电路主要利用暗像元电阻不随光照变化,而感光像元电阻会随光照强度变化而变化的特点,将光照条件下暗像元支路的电流与感光像元支路电流的差作为光响应电流,并采用CTIA积分电路进行电流积分,将光响应电流转换为积分电压输出,进而实现石墨烯探测器对光响应信号的探测和输出。文中对相关的主要电路设计进行了分析,并基于Cadence ADE仿真环境完成了电路仿真。经仿真分析,基于文中的积分电路,可以将不同光照条件下石墨烯探测器的光响应转换为对应的积分电压输出。可见,所设计的积分电路能够满足石墨烯探测器对光响应探测的需求,对石墨烯材料进入光电探测器领域具有重要意义。

Abstract:

In order to solve the problem of photoelectric detection of graphene detectors, a new integrated circuit structure based on graphene detectors was designed according to the change of resistance of illuminated pixels of graphene detectors. The integrated circuit structure mainly includes front-end bias circuit, operational amplifier, switch and feedback capacitor. The circuit mainly utilizes the characteristics that dark pixel resistance does not change with illumination, but the resistance of photosensitive pixel changes with illumination intensity. The current of photosensitive pixel branch under illumination condition changes. And the difference of current from photosensitive pixel branch to dark pixel branch is taken as the light response current, and the CTIA integral circuit is used to integrate the current. The light response current is converted to the integral voltage, and then the detection and output of the light response signal of the graphene detector are realized. In this paper, the related main circuit design is analyzed, and the circuit simulation is completed based on the cadence ADE simulation environment. The simulation results show that the photoresponse of graphene detector under different illumination conditions can be converted to the corresponding integrated voltage with the integrated circuit in this paper. Therefore, the designedintegrated circuit can meet the needs of the graphene detector for the detection of light response, and it is of great significance for graphene materials to enter the field of photodetectors.