请大家帮忙翻译一下，谢谢。
时间：10-02
整理：3721RD
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请大家帮忙翻译一下offset frequency source和offset signal的准确意思，这两个词组出现在一篇讲述微波频率合成器的文章中。谢谢了。原文如下：
The synthesizer’s main characteristics can be dramatically improved by employing a frequency conversion(mixing) within the synthesizer feedback path [44] as shown in Figure 44. The VCO output frequency is converted to a much lower frequency with the aid of an offset frequency source[/COLOR] in order to minimize the maximum frequency division ratio. The offset signal[/COLOR] can be produced using an additional PLL or a chain of frequency multipliers.
The synthesizer’s main characteristics can be dramatically improved by employing a frequency conversion(mixing) within the synthesizer feedback path [44] as shown in Figure 44. The VCO output frequency is converted to a much lower frequency with the aid of an offset frequency source[/COLOR] in order to minimize the maximum frequency division ratio. The offset signal[/COLOR] can be produced using an additional PLL or a chain of frequency multipliers.
移频源，移动信号
偏执 我记得在手机里有OPLL 偏执锁相环