YIG微波鎖相環(huán)的非線性性能分析
THE NONLINEAR PERFORMANCE ANALYSIS OF YIG MICROWAVE PHASE LOCKED LOOP
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摘要: 釔鐵石榴石(YIG)振蕩器具有調(diào)諧范圍寬、調(diào)諧線性好、噪聲低等優(yōu)點,在部分覆蓋式微波頻率綜合實驗中,用它作壓控振蕩器(VCO),在 24 GHz 頻段內(nèi),成功地綜合出上萬個具有高穩(wěn)石英晶振穩(wěn)定度和準確度的微波頻率。本文從理論上研究了磁場滯后效應對此實驗中的YIG鎖相環(huán)非線性性能的影響。用解析近似法推導出存在磁場滯后效應的YIG鎖相環(huán)的三個公式,即平均頻差公式、捕捉時間公式和捕捉帶公式,公式具有明確的物理意義。實驗表明,捕捉帶公式與實際測量結果有較好的一致性。
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Abstract: YIG tuned oscillator combines linear broad band tunability and low noise characteristics. is used as VCO of PLL in the partial coverage type microwave synthesis experiment. More than ten thousand discrete frequencies from 2GHz to 4GHz, having the stability and acuracy of an ultra-stable quartz crystal oscillator, have been synthesized successfully. The influence of magnetic field hysteresis on the nonlinear performance of PLL is studied theo-retically. Three formulas of YIG phase locked loop with magnetic field hysteresis have been derived by analytical approximation method. They are the average frequency difference formula, the acquisition time formula and the acquisition range formula. The formulas have clear physical meanings. the experiment shows that the acquisition range formula agrees with the result of actual measurement. approximately. -
R. J. Clark and D. B. Swartz, Microwave, 11(1972)2, 40.[2]R. J. Clark and D. B. Swartz, Microwave, 11(1972)3, 46.[4]R. C. Fletcher and R. Bell, J. Appl. Phy., 30(1959) 5, 687.[5]P. M. Oliver, IEEE Trans. on SC, SC-7(1972) 1, 55.[6]郭貽成,鐵磁學,高等教育出版社,1965年,第326頁.[8]鄭繼禹等,鎖相環(huán)路原理與應用,人民郵電出版社,1976年,第130頁. -
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