高灵敏表面光伏谱前置放大器的研制

Development of high-sensitivity preamplifier of surface photovoltaic spectroscopy

表面光伏技术可测量半导体材料的少数载流子的扩散长度、表面电荷等，能表征半导体微结构。采用静电计管作为信号的前置放大器具有电压增益低、体积大等缺点。介绍了一种表面光伏谱前置放大器的设计原理、设计方案和应用实例。该前置放大器具有灵敏度高、响应时间短、截止频率低等优点，并且体积小、使用成本低。

The paper introduces the design and application of a new kind of surface photovoltaic spectroscopy preamplifier. This preamplifier has not only advantages of high sensitivity, low response time, low cut-off fre quency, but also smaller size and lower price.