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在单边带通信中,相位噪声是代表短期稳定度的一种起伏量,也是频率合成器的主要技术指标。目前国内试制的频率合成器很多是在想方设法改善这一指标。本文仅就改善压控振荡器(以下简称VCO)的相位噪声提出一些切实可行的有效措施。 VCO的电压频率特性决定了VCO的压控灵敏度。若压频特性的线性不好,则引起压控灵敏度不均匀,从而使频率合成器的环路稳定性和相位噪声这二个主要技术指标之间的矛盾突出,同时也影响到环路阻尼因子ξ和自然频率ω_(n0)此外,在借助于LC压控
In single-sideband communication, the phase noise is a kind of fluctuation that represents the short-term stability, and is also the main technical index of the frequency synthesizer. At present, many trial-and-synthesis frequency synthesizer is trying to improve this indicator. This article only to improve the voltage-controlled oscillator (hereinafter referred to as VCO) phase noise put forward some practical and effective measures. The voltage-frequency characteristic of the VCO determines the voltage-controlled sensitivity of the VCO. If the linearity of the frequency-frequency characteristic is not good, the sensitivity of the voltage-control is not uniform, so that the conflict between the two main technical indicators of loop stability and phase noise of the frequency synthesizer is outstanding, and the loop damping factor The ξ and the natural frequency ω_ (n0) are, in addition, controlled by means of LC