题目/Title：Continuously Auto-Tuned and Self-Ranged Dual-path PLL design with Hybrid AFC

作者/Author：
                        Min Wang,Bo Zhou,Woogeun Rhee,Zhihua Wang

会议/Conference：ICICDT 2011

地点/Location：Kaohsiung

年份/Issue Date：2011.2-4 May

页码/pages：pp. 1 - 4

摘要/Abstract：
This paper describes a dual-path phase locked loop(PLL) design which automatically tunes to capture the desiredfrequency as well as the input control voltage range of the dualpathLC voltage-controlled oscillator (VCO). A hybrid automaticfrequency calibration (AFC) circuit provides digital frequencycalibration and mixed-mode continuous frequency tuning. Sincethe hybrid AFC circuit independently controls the coarse-tuningcontrol voltage of VCO in this structure, the VCO input controlvoltage range can be preset before the PLL is locked. Therefore,an optimum loop filter voltage range can be chosen to have goodcharge pump matching or VCO gain linearity. Simulation resultsverify that the self-ranged control can be achieved by adjustingthe output range of the limiting amplitude amplifier (LAA)during the PLL transient mode.