An 11.2-mW 5-GHz CMOS Frequency Synthesizer with Low Power Prescaler for Zigbee Application

作者：Ji Xincun^*; Huang Fuqing; Wu Jianhui; Shi Longxing

来源：IEICE - Transactions on Electronics, 2011, E94C(3): 375-378.

DOI：10.1587/transele.E94.C.375

• CMOS
• WSN
• half-integer phase-switching prescaler
• frequency synthesizer

A 1.8 V, 5 GHz low power frequency synthesizer for Wireless Sensor Networks is presented in 0.18 mu m CMOS technology. A low power phase-switching prescaler is designed, and the current mode phase rotator is merged into the first divide-by-2 circuit of the prescaler to reduce power and propagation delay. An improved charge pump circuit is proposed to compensate for the dynamic effects with the charge pump. By a divide-by-2 circuit, the frequency synthesizer can provide a 2.324-2.714 GHz quadrature output frequency in 1 MHz steps with a 4 MHz reference frequency. The measured output phase noise is -110 dBc/Hz at 1-MHz offset frequency. The power consumption of the PLL is 11.2 mW at 1.8 V supply voltage.

• 出版日期2011-3
• 单位东南大学