A Low Phase Noise Ring-VCO Based PLL Using Injection Locking for ZigBee Applications

• 作者: Fatemeh Talebi Hassan Ghafoorifard Sajjad Shieh Ali Saleh Samad Sheikhaei
• 来源期刊: 电路与系统(英文)
• 学科: 工学
• 关键词: ZIGBEE Frequency SYNTHESIZER Phased Locked Loop Injection LOCKING Technique
• 年，卷（期）: 2013,（3）
• 页码范围: 304-315
• 页数: 12页
• 分类号: TN7

摘要

A low power low phase noise frequency synthesizer with subharmonic injection locking is proposed for ZigBee applications. The PLL is based on a ring VCO to decrease area and production cost. In order to improve phase noise performance, a high frequency injection signal of which frequency varies with channel number is used. The circuit is designed in TSMC 0.18 μm CMOS technology and simulated in ADS (Advanced Design System). The phase noise at 3.5 and 10 MHz offsets is -116 and -118 dBc/Hz, respectively, and total circuit consumes 2.2 mA current.