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The IEEE standards board has announced the approval of the 10G-EPON standard, IEEE Std. 802.3av. In this paper, a 10Gb/s burst-mode laser diode driver for the symmetric-rate 10G-EPON ONU applications is described. It is designed with a low-cost 0.18µm CMOS process. Post-simulation results that it has a speed of 10.3125Gb/s, and is able to provide up(More)
A new triterpene (1), 3-β-O-olean-11,13 (18)-diene-23,28-dioic acid, together with five known compounds (2-6), was isolated from Anoectochilus elwesii and their structures were elucidated by extensive spectroscopic methods and comparison with the literature data. Compound 1 was the first example of highly oxygenated triterpene obtained from Anoectochilus(More)
Ridge orientation is one of the fundamental features of a fingerprint image. Orientation estimation serves for feature extraction and matching and is the base of fingerprint recognition. Most existing orientation estimation methods are based on the characteristic of pixel intensity in a block. This paper uses neural network to learn the ridge orientation.(More)
A 5GHz Gated VCO for burst-mode operation in 10Gbps GPON and EPON systems is presented. The GVCO consists of four stages of XNOR/XOR cell with voltage-controlled delays, and aligns output clock to burst data within 2 bits time. The GVCO has a tuning range from 4.4GHz to 6.2GHz. The phase noise of the GVCO in steady state circuit is -105dBc/Hz at 5MHz(More)
To avoid the drawbacks of conventional selectors, a newly designed one is presented. In this chip, lumped devices are replaced by distributed ones, for example transmission lines instead of inductors. The bottleneck in the realization of the high speed selector is broken through by designing a third order Butterworth filter. The problem in input matching is(More)
OBJECTIVE To investigate the chemical constituents from the whole herbs of Anoectochilus chapaensis. METHODS The chemical constituents were isolated and purified by repeated column chromatographies with silica gel, Sephadex LH-20 and preparative TLC. Their structures were identified by their physiochemical property and spectral data. RESULTS 6 compounds(More)
A novel 43Gb/s 1:4 demultiplexer (DEMUX) applied in SONET OC-768 was realized in OMMIC's 0.2μm GaAs PHEMT. This DEMUX is featured for achieving one stage demultiplexing by using a long transmission line. This method not only reduces the components of the DEMUX but also lowers its power dissipation. The fabricated DEMUX operates error free at 43Gb/s(More)
A novel flavonol triglycoside (4), isorhamnetin-3-O-β-D-glucopyranosyl (1→2)-α-L-rhamnopyranosyl (1→6)-β-D-glucopyranoside, named elwesoside A, together with six known flavonols (1-3, 5-7) was isolated from Anoectochilus elwesii (Clarke ex Hook. f.) King et Pantl. and its structure was elucidated by extensive spectroscopic methods and comparison with the(More)
The study with pot experiment and simulation test showed that after planted hyperaccumulator Sedum alfredii Hance on mining soil, the water soluble Zn and NH4OAc extractable Zn in rhizosphere were decreased obviously, while the available Zn in non-rhizosphere had less change. The pH value of rhizosphere soil was decreased by 0. 3 units, whereas the organic(More)
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