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此前置放大器是为配较大面积的平面型HPGe探测器而研制的。它是由一个以低噪声FET做为输入级的电荷灵敏环与一个电压环所组成。为了降低噪声,将输入级(FET)及反馈电阻均置于低温真空室内,并以反馈电阻的分布电容作为反馈电容。
The preamplifier was developed for a larger area planar HPGe detector. It consists of a charge-sensitive ring with a low-noise FET as the input stage and a voltage ring. To reduce noise, place the input stage (FET) and feedback resistor in a low-temperature vacuum chamber and use the distributed capacitance of the feedback resistor as the feedback capacitance.