Introduction.- Wireless Transceivers and Frequency Synthesis.- Multi-standard Wireless Front-ends.- Case Study: Handover with WLAN, WiMAX and 3G.- Frequency Synthesizers.- Case Studies of PPL Enhancements.- Choice of Sigma-Delta Modulation.- Case Study: A WiMax/WLAN/LTE Synthesizer.- Implementation: A WiMax/WLAN/LTE Synthesizer.- Calibration Enabling First-Pass Success.- Conclusions.