为了保证低泄漏电流和低介电吸收，反馈电容器应当由合适的介电材料(如聚苯乙烯、聚丙烯或聚四氟乙烯)制成。

To ensure low leakage current and low dielectric absorption, the feed back capacitor should be made of a suitable dielectric material such as poly styrene, polypropylene, or Teflon.

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然而，要使用电容器就必须明白其特性：包括电容值、额定电压值、温度系数以及泄漏电阻等。

However, to be useful, they must be characterized for capacitance value, voltage rating, temperature coefficient, and leakage resistance.

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