HxRG近红外探测器缓冲工作模式的性能优势
Performance advantages of buffered mode operation of HxRG near infrared detectors
摘要：
Teledyne HxRG探测器具有多功能和可编程输出选项，允许在各种配置下运行，如慢速无缓冲、慢速缓冲、快速缓冲或无缓冲模式，以优化给定应用的探测器性能。通常在ESO时，为了实现低噪声工作，探测器以慢速非缓冲模式工作。虽然慢速非缓冲模式提供了到外部MEMS电子器件的简单接口，但是在该模式下的检测器操作可能遭受降低的像素频率响应和读出通道之间的较高的电串扰。在ELT第一代仪器（MICADO、HARMONI和METIS）所需的探测器系统的背景下，进行了一项练习，以评估慢缓冲模式下探测器的噪声、速度和串扰性能。一个测试模块设计了缓冲或非缓冲模式下的H2RG检测器操作选项，使用或不使用基准输出，因此可以在不同模式之间进行直接的性能比较。本文提出的性能优势，如增加像素频率响应，消除读出通道之间的电串扰和缓冲模式操作中的噪声性能。这些改进使我们能够使用ELT仪器的一半检测器低温电子器件和检测器控制器电子器件来实现相同的帧读出时间，这显著降低了仪器中相关的低温机械复杂性。
英文摘要：
The Teledyne HxRG detectors have versatile and programmable output options to allow operation of them in a variety of configurations such as slow unbuffered, slow buffered, fast buffered or unbuffered modes to optimise the detector performance for a given application. Normally at ESO, for low noise operation, the detectors are operated in slow unbuffered mode. Whilst the slow unbuffered mode offers a simple interface to the external preamplifier electronics, the detector operation in this mode can suffer from reduced pixel frequency response and higher electrical crosstalk between the readout channels. In the context of the detector systems required for the first generation instruments of the ELT (MICADO, HARMONI and METIS), an exercise was undertaken to evaluate the noise, speed and crosstalk performance of the detectors in the slow buffered mode. A test preamplifier has been designed with options to operate a H2RG detector in buffered or unbuffered and with or without using the reference output, so a direct performance comparison can be made between different modes. This paper presents the performance advantages such as increased pixel frequency response, elimination of electrical crosstalk between the readout channels and the noise performance in the buffered mode operation. These improvements allow us to achieve the same frame readout time using half the detector cryogenic electronics and detector controller electronics for the ELT instruments, which significantly reduces the associated cryomechanical complexities in the instrument.
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