Substrate Noise Coupling Reduction in LC Voltage-Controlled Oscillators

作者：Wu Yu Chen; Hsu Shawn S H; Tan Kevin K W; Su Yu Shiang

来源：IEEE Electron Device Letters, 2009, 30(4): 383-385.

DOI：10.1109/LED.2009.2012729

• Integrated circuits
• noise

In this letter, a substrate noise coupling effect in LC voltage-con trolled oscillators (VCOs) was investigated. By 0.18-mu m CMOS technology, three 2.4-GHz VCOs were designed using different types of spiral inductors to observe the substrate noise induced spurs. Compared with the design using a standard Inductor, the proposed deep N-well (DNW) and patterned ground shield (PGS) VCOs demonstrated clearly reduced third-order intermodulation spurs by 6-8 and 10-15 dB, respectively. Based on the established physical-based equivalent circuit models, we found that the low-impedance paths introduced by DNW and PGS were the dominant factor for the observed substrate noise reduction in the proposed VCOs.

• 出版日期2009-4
• 单位中国科学院电工研究所; 清华大学