Digital Phase Locked Loop

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1、DigitalPhaseLockedLoopDevonFernandezandSanjeevManandharDecember8,200311AbstractDPLLsareusedwidelyincommunicationssystems.Asastudyofthesedevices,twoDPLLsaredesignedandlayedoutina0.5umCMOSprocess.Oneishasa30MHzstarvedinverterVCO,aprogrammabledividerandaphasefrequencydetecto

2、r.Thesecondconsistsofa400MHzdierentialinverterVCO,axeddividerandanXORphasedetector.Bothdevicesarelayedouttogetherona1.5x1.5mmdie.2Contents1Abstract22Introduction72.1PhaseLockedLoops(PLL)..............................72.2DigitalPLLs(DPLL).................................

3、72.2.1VoltageControlledOscillator.........................82.2.2Divider.....................................82.2.3PhaseDetector.................................82.2.4LoopFilter...................................82.3DPLLsPresented....................................83Circu

4、itDesign93.1BasicLogicCircuits..................................93.1.1Inverter.....................................93.1.22InputNAND.................................93.1.33InputNAND.................................93.1.48InputNAND.................................93.1.5XOR.

5、......................................93.1.6XNOR......................................93.1.7DLatch.....................................93.1.8TLatch.....................................93.2PhaseFrequencyDetectorDigitalPhase-LockLoop(PFDDPLL)........143.3PhaseFrequencyDetec

6、tor...............................143.3.1D-latch.....................................153.3.2Two-inputnandgate..............................153.3.3Tristategate..................................153.4LoopFilter.......................................163.5VoltageControlledOsci

7、llator(VCO).........................173.6FrequencyDivider...................................193.6.18-bitcounter..................................193.6.2XNORgate...................................203.6.38-inputNANDgate..............................203.7DigitalOutputBuer..

8、...............................213.8QuadDPLL.......................................223.8.1Quadra