Che-Yung Lin

National Taiwan University, T’ai-pei, Taipei, Taiwan

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Publications (4)5 Total impact

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    ABSTRACT: A cost-effective isolation technique using laser treatment is proposed to suppress the undesired crosstalk between dual power amplifiers (PAs), which are essential to multiple-input multiple-output communications system. Laser treatment not only reduces the small-signal coupling between dual PAs but also enhances the linearity of the PA under dual-PA operation mode. The figure of merit for the small-signal coupling has an improvement of 4.55 dB at 2.45 GHz, and the output power at 3% (- 30 dB) error vector magnitude (EVM) has a linearity improvement of 6.1 dB under 0-dB interference.
    No preview · Article · Oct 2008 · IEEE Microwave and Wireless Components Letters
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    Tzyy-Jiann Wang · Chia-Hong Chu · Che-Yung Lin
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    ABSTRACT: Electro-optical tuning of a microring resonator fabricated on lithium niobate (LiNbO3) is presented. The device structure, including microring resonator and couplers, is designed in detail and is produced by titanium diffusion on the wet-etched LiNbO3 ridge surface. The resonance wavelengths for TM and TE polarizations can be tuned by electro-optic effect. The output characteristics of through port and drop port in the microring resonators are measured, and the effect of applied voltage on the shift of resonant wavelength is discussed. The presented microring resonators have the features of fast tuning speed, high material stability, bidirection wavelength shift, and no heating interference. Realization of such a microring resonator on LiNbO3 makes the utilization of electro-optic tuning and nonlinear effects in the versatile photonic applications of microring resonators achievable.
    Preview · Article · Nov 2007 · Optics Letters
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    ABSTRACT: A differential power combining method for general power amplifiers (PAs) with combining and matching network using lumped components is proposed for the first time. The proposed power combining technique greatly reduces board area at 1.95 GHz as compared to the traditional in-phase power combining method using transmission line, such as Wilkinson power combiners. The output matching is achieved with smaller impedance transformation ratio and the matching loss is reduced. The proposed SiGe PA with power combining technique achieves 28 dBm output power, 14 dB gain and 22.6% power-added efficiency (PAE) at 1.95 GHz with 1dB output power enhancement as compared to the single PA.
    No preview · Conference Paper · Jan 2007
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    ABSTRACT: The large-signal and small-signal coupling effects of dual SiGe power amplifiers (PAs) on a single chip for 802.11n multiple input multiple output (MIMO) applications are demonstrated for the first time. Deep trench isolation and grounded guard ring are used for crosstalk isolation at both transistor and circuit levels. The equivalent small-signal coupling at 2.45 GHz between two PAs is -30 dB. The PA delivers 18.1 dBm and 16.6 dBm with 3% EVM (OFDM, 64-QAM) in single and dual PA operation modes, respectively. The EVM degradation becomes severe as the relative interfering power level increases
    Preview · Conference Paper · Jul 2006