We have designed ECLIPSE, the readout circuit of the space infrared observatory project SPICA and its instrument B-BOP. When coupled to a 16 × 16 pixel detector matrix, the circuit fulfils two functions: an initial “amplification” stage (buffering) at input, and a subsequent 16 to 1 time multiplexing of the detector readout. Since it is placed directly above the detector and consequently needs to operate at 50 mK, it requires very low power consumption. To reduce power consumption, the input stage of a channel is powered only when it is read, i.e., 1/16th of the time. In addition, since the impedance of the detector is very high (1 GΩ), a complex sequencing of the clocks has been implemented to avoid charge injection in the detector when switching. The performance of the used technology, CMOS 0.35 µm by AMS, had been previously validated at 100 mK on a technology qualification circuit. The circuit has been recently received from the foundry; testing will start in the coming months.

中文翻译：

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ECLIPSE，用于 SPICA 空间天文台项目的偏振相机 B-BOP 的低温读出电路

我们设计了 ECLIPSE，空间红外天文台项目 SPICA 的读出电路及其仪器 B-BOP。当耦合到 16 × 16 像素检测器矩阵时，该电路实现两个功能：输入端的初始“放大”级（缓冲），以及检测器读数的后续 16 比 1 时间复用。由于它直接放置在检测器上方，因此需要在 50 mK 下运行，因此它需要非常低的功耗。为了降低功耗，通道的输入级仅在读取时才供电，即1/16 的时间。此外，由于检测器的阻抗非常高 (1 GΩ)，因此已实施复杂的时钟排序，以避免切换时检测器中的电荷注入。所用技术的性能，AMS 的 CMOS 0.35 µm，之前已经在技术认证电路上以 100 mK 进行了验证。该电路最近已从代工厂收到；测试将在未来几个月开始。