外文翻译--低功率低噪声的锁相环的设计基于锁相环的测量信号的处理与仿真.doc

外 文 翻 译 毕业设计题目： 基于锁相环的测量信号的处理与仿真 原文1： Frequency Modulation in Microwave Phase Lock Loop Synthesizers 译文1： 微波锁相回路合成器的调频 原文2： The Design of A Low-Power Low-Noise Phase Lock Loop 译文2： 低功率低噪声的锁相环的设计 Frequency Modulation in Microwave Phase Lock Loop Synthesizers Abstract — This paper shows, that frequency modulation bandwidth of phase locked controlled oscillator (CO) can be simple expanded using precorrecting circuit (corrector) connected to control port of oscillator. A method is presented of calculation of corrector according to exact PLL and frequency response of modulation channel, with experimental demonstration presented of adequacy of described technique being shown. Index Terms — Microwave PLL synthesizer, frequency modulation, maximum deviation, modulation bandwidth. I. INTRODUCTION In many microwave systems the synthesizer must generate frequency modulated signal in addition to monochromatic signal generation, its main function. Solution of this problem in case of phase lock loop (PLL) synthesizer becomes complicated due resistance of PLL to the CO modulation, as an automatic control system. The most difficulty is the expansion of modulation band and the modulation index range. The purpose of this paper is contribution in solution of these problems. II. TARGET SETTING It is well known that frequency modulation possibility of phase locked CO is limited by cutoff band. Modulation bandwidth corner is equal to PLL angular frequency [1]. In band above cutoff the loop makes no resistance to the CO modulation, but below cutoff its resistance increases when modulating frequency decreases. Thus, modulation bandwidth of CO must be widened up to down the PLL angular frequency. It can be made by three issues: ? By decrease of PLL cutoff frequency; ?by impact modulating signal into PLL: modulation of the reference frequency, manipulation of feedback d