此外，作者还给出了二维各向同性谐振子的附加运动常数的正确表达式。
Besides, author derived a correct expression of additional motional constant for the two dimensional isotropic harmonic oscillator.
当脉冲式鉴相器中的时间常数不能忽略并具有附加简单RC网络时，得到了系统稳定的条件。
The stability condition for the system is obtained when the time constant in the pulse operated phase discriminator can not be neglected and with an additional simple RC network.
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