The voltage - controlled oscillator and the dual - modulus prescaler are the most crucial blocks in the pll frequency synthesizer . two kinds of voltage - controlled oscillator ( the quadrature voltage - controlled oscillator based on symmetrical spiral inductors and differential varactors , and the voltage - controlled oscillator with wide tuning range based on mos varactors ) and two kinds of prescaler ( the prescaler using phase - switching techniques , and the prescaler using dynamic circuit techniques ) are proposed . then , the complete pll frequency synthesizer is implemented , in which 壓控振蕩器和雙模預分頻器是鎖相環型頻率合成器中最關鍵的兩個模塊,本論文分別實現了兩種類型的壓控振蕩器(采用對稱螺旋型電感和差分二極管型容抗管的正交壓控振蕩器和使用mos型容抗管的大調諧范圍壓控振蕩器)和兩種類型的雙模預分頻器(使用相位開關技術的雙模預分頻器和使用動態電路技術的雙模預分頻器) 。