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(3)电容器的选取 电容器存在介质损耗引起的热噪声、引线接头引起的接触噪声、端电压引起的过剩噪声。比较好的电容,这些噪声很小,以致可以忽略不计。然而,在低噪声电路中还是要尽可能选取低噪声电容器。选择低噪声的电容器就是要选择损耗角小的电容。小容量的通常选用云母和瓷介电容器来降低噪声;大容量的选用电解电容器。但因铝电解电容漏电相当大,而钽电解电容漏电很小,因此钽电解电容适宜用在低噪声电路中。
(3) Capacitor Selection The capacitor has thermal noise due to dielectric loss, contact noise caused by the lead connector, and excess noise caused by the terminal voltage. Better capacitors, these noises are so small that they are negligible. However, low-noise circuits should be selected as low-noise capacitors as possible. Select low-noise capacitor is to choose a small loss angle capacitor. Small capacity is usually the choice of mica and porcelain dielectric capacitors to reduce noise; large capacity electrolytic capacitors. However, due to a large aluminum electrolytic capacitor leakage, and tantalum electrolytic capacitor leakage is small, so tantalum electrolytic capacitors suitable for use in low-noise circuits.