A fast-settling frequency-presetting PLL frequency synthesizer with process variation compensation and spur reduction
具有工艺补偿和毛刺消除功能的快速锁定频率预置锁相环频率综合器

This paper proposes a fast-settling frequency-presetting PLL frequency synthesizer. A mixed-signal VCO and a digital processor are developed to accurately preset the frequency of VCO and greatly reduce the settling time. An auxiliary tuning loop is introduced in order to reduce reference spur caused by leakage current. The digital pro- cessor can automatically compensate presetting frequency variation with process and temperature, and control the operation of the auxiliary tuning loop. A 1.2 GHz integer-N s...