A millimeter-wave (mmW) frequency synthesizer for 60GHz wireless transceiver is presented. To achieve wide range and low noise operation, a new sampling PD based PLL (S-PLL) is proposed. In contrast to conventional sub-sampling PD based PLLs, it provides a wider capture range without suffering from harmonic lock problems. Also, compared to conventional CP-based PLLs, the inband noise is improved by 13 dB while the reference spur is improved by more than 16 dB. Implemented in TSMC 28nm CMOS technology, the core circuit occupies a chip area of 0.175mm2. The measured phase noise from a 48 GHz carrier is-95.7dBc/Hz at 1MHz offset. The power consumption is 54mW.