Browsing by Author "Tian, Xin-Cheng"

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A Bias-Varied Low-Power K-band VCO in 90 nm CMOS Technology
(2012-06-01)
Liu, Szu-Ling
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Tian, Xin-Cheng
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Hao, Yue
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Chin, Albert
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電子工程學系及電子研究所
This letter presents a novel bias-varied low-power K-band voltage controlled oscillator (VCO) in a standard 90 nm CMOS technology. This circuit exhibits low power consumption of <= 3mW and a 12.2% tuning range with low phase noise characteristic. These performances are realized by combination of the transformer-feedback and the switchable active circuit block, which can control the dc power at different frequencies and improve the phase noise.
Investigation and Optimization of Low-Power Techniques in X-Band CMOS LC-VCO Design
(2011)
Tian, Xin-Cheng
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Liu, Szu-Ling
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Chen, Kuan-Han
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Hao, Yue
;
電子工程學系及電子研究所
This paper investigates the optimization method for two low-power circuit techniques in low-power LC-VCO designs: Transformer feedback and forward body-bias. In addition to theoretical analysis, a low-power, low-voltage X-band VCO using these two techniques has also been implemented in a standard 0.18 mu m CMOS technology. This VCO exhibits good FOM and of -191.4dBc/Hz while the core circuit draws a DC current of 2.73mA from 0.55V low supply voltage. The excellent performance can be compared with the best reported X-band CMOS VCOs.