Browsing by Author "Wang, Chia-Ling"

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2.4-GHz 7.4-mW 300-kHz Flicker-Noise-Corner Direct Conversion Receiver Using 0.18 mu m CMOS and Deep-N-Well NPN BJT
(2013)
Chang, Wei-Ling
;
Meng, Chin-Chun
;
Syu, Jin-Siang
;
Wang, Chia-Ling
;
Huang, Guo-Wei
A low-power low-flicker-noise receiver is demonstrated using 0.18 mu m CMOS technology. Vertical-NPN bipolar junction transistors (BJTs) in standard CMOS process are used to substitute the mixer switching core and the input stage of subsequent IF VGA. Compared with the conventional CMOS mixer, the excellent flicker noise performance is obtained. As a result, the receiver achieves a 47 dB voltage gain at 2.4-GHz, and the noise figure is 9.6 dB at IF=100 kHz and 5.6 dB for IF>300 kHz. The total current consumption is 4.3 mA at 1.8 V supply voltage.
2.4-GHz Low-Noise Direct-Conversion Receiver With Deep N-Well Vertical-NPN BJT Operating Near Cutoff Frequency
(2011-12-01)
Syu, Jin-Siang
;
Meng, Chinchun
;
Wang, Chia-Ling
;
電機工程學系
;
Department of Electrical and Computer Engineering
A 2.4-GHz low-power low-noise direct-conversion receiver is demonstrated using parasitic vertical-NPN bipolar junction transistors (BJTs) in a standard 0.18-mu m CMOS process. The current switching operation of a Gilbert mixer with finite transistor cutoff frequency (f(T)) is thoroughly analyzed and discussed in this paper. When the mixer operates near or higher than the transistor f(T), the loss of the polyphase filter due to the capacitive loading of the mixer is a main issue. Thus, BJT devices with smaller base resistance and an inductive peaking technique with symmetric 3-D realization are employed in this paper to reduce local oscillator power by 4.5 dB. At 2.4 GHz, the demonstrated receiver has conversion gain of 51 dB and noise figure of 3.2 dB with 70-kHz 1/f noise corner, while the current consumption is 4.5 mA at a 1.8-V supply.
60-GHz Dual-Conversion Down-/Up-Converters Using Schottky Diode in 0.18 mu m Foundry CMOS Technology
(2012-06-01)
Wei, Hung-Ju
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Meng, Chinchun
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Wang, Ta-Wei
;
Lo, Tai-Lin
;
Wang, Chia-Ling
Due to the benefits of Schottky diodes, 0.18-mu m CMOS technology is being promoted for millimeter wave applications. In this paper, 60-GHz dual-conversion down-/up-converters using Schottky diodes are realized by using 0.18-mu m foundry CMOS technology. A CoSi2-Si Schottky diode, fabricated on a lower doped N-well by blocking the threshold voltage adjustment implant, has a lower reverse leakage current and a better ideality factor. Thus, it is ideal for the 60-GHz sub-harmonic mixer design. Two new types of Schottky-diode mixers, a down-conversion sub-harmonic mixer with a dual-band lump-distributed phase-inverter rat-race coupler and an up-conversion sub-harmonic mixer with a trifilar transformer, are realized and employed at the high-frequency conversion stage of the dual-conversion architecture to achieve small size and broadband isolations. The silicon-based Schottky diode with a low turn-on voltage offers great advantage in LO pumping power, especially for an antiparallel diode pair structure. In our Schottky-diode sub-harmonic mixers, the required LO power is only 1 dBm. The dual-conversion down-converter achieves 5-dB conversion gain and 19 dB noise figure under V-dd = 2.5 V and I-dd = 22 mA, and the dual-conversion up-converter, with V-dd = 2.5 V and I-dd = 26 mA, attains greater than 40-dB sideband rejection and -1 dB conversion gain over the whole 60-GHz bandwidth.
9.9-mA 5-6 GHz CMOS Sub-Harmonic Direct-Conversion Receiver Using Deep N-Well BJT
(2014-01-01)
Chang, Wei-Ling
;
Meng, Chin-Chun
;
Syu, Jin-Siang
;
Wang, Chia-Ling
;
Huang, Guo-Wei
A low-power sub-harmonic direct-down receiver is demonstrated using 0.18 mu m CMOS technology. The dynamic range of the receiver is increased by incorporating voltage gain controls with wide tuning range at RF and IF stages. For the flicker noise problem, vertical-NPN bipolar junction transistors (BJTs) in standard CMOS process are employed as the mixer switching core and at the input stage of the subsequent IF VGA. As a result, this work achieves a 45 dB gain from 5-6 GHz with 6 dB noise floor. The total current consumption is 5.5 mA at 1.8 V supply voltage.
A 2.4-GHz Low-Flicker-Noise CMOS Sub-Harmonic Receiver
(2013-02-01)
Syu, Jin-Siang
;
Meng, Chinchun
;
Wang, Chia-Ling
;
電機工程學系
;
Department of Electrical and Computer Engineering
A 2.4-GHz low-noise sub-harmonic direct-conversion receiver (SH-DCR) is demonstrated using standard 0.18-mu m CMOS technology. Deep-n-well vertical-NPN (V-NPN) bipolar junction transistors (BJTs) are employed to solve the flicker noise problem in CMOS process. Design optimization of a power-constrained noise-impedance-matched low-noise amplifier (LNA) with the effect of lossy on-chip inductors is fully discussed in this paper. A multi-stage octet-phase polyphase filter is analyzed in detail and implemented to generate well balanced octet-phase LO signals. As a result, the demonstrated receiver achieves 51-dB voltage gain and 3-dB noise figure with flicker noise corner less than 30 kHz when RF = 2.4 GHz. The I/Q amplitude/phase mismatch is below +/-0.2 dB/+/-1 degrees, respectively, covering from 2.35 to 2.6 GHz. The dc current consumption is 5 mA at a 1.8-V supply.
Agreement Between Automated and Human Measurements of Heart Rate in Patients With Atrial Fibrillation
(2018-09-01)
Lin, Ting-Tse
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Wang, Chia-Ling
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Liao, Min-Tsun
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Lai, Chao-Lun
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分子醫學與生物工程研究所
Background: The accuracy of heart rate (HR) measurement by automated blood pressure monitors in patients with atrial fibrillation (AF) remains unclear. The authors investigate the agreement between HR measurements by 2 automated devices and human counting in patients with AF. Methods: In 47 patients with persistent AF, HR was recorded using 2 automated blood pressure monitors: Omron M5-I and Microlife BPA100 Plus. Human counting of HR by a stethoscope was used as the reference. For each method, 3 readings were made and the mean was calculated for comparison. In addition to Wilcoxon signed rank test, the correlation between HR measurements by automated devices and human counting was determined using Spearman's rank correlation coefficient (r), and the agreement between HR measurements by both devices and human counting was validated by the Bland-Altman plot and intraclass correlation coefficient (ICC). Results: Overall, we found no significant difference in HR measurements between devices and human counting (Omron vs human counting, 81.1 +/- 11.1 vs 80.2 +/- 10.8 beats per minute [bpm]; P = .21, r = 0.911; ICC, 0.954; Microlife vs human counting, 81.3 +/- 10.8 vs 80.2 +/- 10.8 bpm; P = .22, r = 0.842; ICC, 0.912). However, in patients with HR greater than 80 bpm, the HR measured by the Microlife device was significantly higher than that measured by human counting (91.1 +/- 5.2 vs 87.1 +/- 8.6 bpm, P = .034). Conclusion: There was a high agreement between HR measurements by 2 automated devices and human counting, but the Microlife device may overestimate HR in AF patients with HR greater than 80 bpm.
pHEMT Single-Voltage-Supply Direct-Conversion Receiver With a 3-10 GHz LC Ladder LNA
(2019-01-01)
Hsiao, Yu-Chih
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Meng, Chinchun
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Wang, Chia-Ling
;
Huang, Guo-Wei
;
電子工程學系及電子研究所
A 3-10 GHz single-voltage-supply pHEMT direct-conversion receiver with a wideband LC-ladder inductively source-degenerated common-source low-noise amplifier is demonstrated in this paper. A wideband LR-CR LO generator is applied to the Gilbert mixers. The measurement results shows 13 similar to 15 dB conversion gain and 6-10 dB noise figure in the 3-10 GHz operating frequency range while the LO power is about 8 dBm and IF=300 MHz. The current consumption of the receiver is 70 mA at 3.3 V supply voltage.