一种新型的跳频频率合成器

在传统的锁相式频率综合器中提高跳频速率受到捕获和频率牵引过程的限制。文中提出了一种新的锁相式频率综合器的结构，这种结构通过锁相环路提供预置电压。分析结果表明环路增益、开环、闭环和误差传递函数与分频比Ｎ无关，环路自然频率、阻尼系数和ＶＣＯ瞬时相位也与Ｎ无关，且实验结果表明这种方案中跳频时间与跳频步长无关，其跳频时间比现有方法改善一个数量级。因而文中所方案可实现快速跳频。

A Noval Frequency-Hopping Synthesizer

The enhancing rate of FH in conventional phasc-locked frequency synthesizer was limited by accquirement and frequency drawing processes. This paper proposes a new structure of phase-locked frequency synthesizer in which the present voltage is provided by closde-ollp.The analystic results on the scheme proposed in this paper show that the loop-gain, opened-ollp, closed-ollp and error transformer functions are unrelated with the ratio N of division frequency, and the natural frequency, damping coefficient and the instantaneous phase of VCOalso unrelated with N. The reults in experiments show that the FH time is not related with the step-length of FH and improed with one order of magnitude faster than the existed method, and the proposed scheme can realize the fast FH.