DocumentCode :
1140877
Title :
Substrate Noise Coupling Reduction in 
Voltage-Controlled Oscillators
Author :
Wu, Yu-Chen ; Hsu, Shawn S H ; Tan, Kevin K W ; Su, Yu-Shiang
Author_Institution :
Inst. of Electron. Eng., Nat. Tsing Hua Univ., Hsinchu
Volume :
30
Issue :
4
fYear :
2009
fDate :
4/1/2009 12:00:00 AM
Firstpage :
383
Lastpage :
385
Abstract :
In this letter, a substrate noise coupling effect in LC voltage-controlled oscillators (VCOs) was investigated. By 0.18-mum 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.
Keywords :
CMOS integrated circuits; equivalent circuits; inductors; integrated circuit modelling; integrated circuit noise; voltage-controlled oscillators; CMOS technology; LC voltage-controlled oscillator; deep N-well; equivalent circuit model; frequency 2.4 GHz; intermodulation spurs; patterned ground shield; size 0.18 mum; spiral inductor; substrate noise coupling reduction; Integrated circuits; noise;
fLanguage :
English
Journal_Title :
Electron Device Letters, IEEE
Publisher :
ieee
ISSN :
0741-3106
Type :
jour
DOI :
10.1109/LED.2009.2012729
Filename :
4773236
Link To Document :
