Browsing by Author "Chen, WM"

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A 1-V 2.4-GHz cmos frequency synthesizer with current-match charge pump
(2004)
Wu, CY
;
Hsieh, CY
;
Chen, WM
;
電機學院
;
College of Electrical and Computer Engineering
A 1-V 2.4-GHz fully integrated frequency synthesizer for Bluetooth applications is proposed and designed in 0.25-mu m CMOS technology. An improved current-match charge pump circuit without the start-up problem is used to reduce the spur level. Moreover, a bandswitching VCO is used to reduce the Kvco and hence the spur level can be further reduced. The prescaler is designed in 1-V supply voltage without the supply-voltage boosting. The circuit is verified by both HSPICE and ADS simulations.
Reverse CoSi(2) thermal stability and digitized sheet resistance increase of sub-90 nm polysilicon lines
(2005-04-01)
Lo, CY
;
Peng, YC
;
Chen, YM
;
Tu, GC
;
Lin, SS
An equation for quantifying the CoSi(2) thermal stability of polysilicon lines ranging from 50 nm to 2 mu m is proposed for the first time. In contrast to the intuitive thinking of narrower lines having a worse thermal stability, the equation predicts the weakest thermal stability occurring at the super nominal line in 90nm technology. An interesting phenomenon of digitized resistance increase is also reported for the first time.