Hen-Wai Tsao

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A millimeter-wave (MMW) frequency synthesizer needs a low-power frequency divider (FD) with a wide input locking range to ensure reliability and lower power operation. In this paper, the design and analysis of low-power wide locking range MMW FDs are presented. Proposed are two divide-by-2 (D2) and divide-by-4 (D4) FDs that achieve the widest locking range(More)
Linear amplifier with nonlinear components (LINC) is a power linearization method which offers both high linearity and high power amplifier (PA) efficiency in wireless transmitters. While LINC increases the power efficiency of PAs, this linearization technique requires an extra power combiner which results in low power efficiency of whole system. To improve(More)
In this paper, we present the design and measurement results of multiple channel programmable timing generators (TGs) using single cyclic delay line for high-speed automatic test equipment (ATE) with 37.5 ps resolution and 5 ms programmable delay range. There are three TGs, and each one consists of a 19-bit 360-MHz count-up counter, a 19-bit cycle(More)
According to the overviews and analysis of adaptive brightness correction, we provide an available solution for the interference of environment light in digital cameras, but current methods are still not suitable for VLSI design. In this paper, we propose an efficient method, called local bi-histogram equalization (LBHE), to remedy the local visibility and(More)
In the last decades, Internet becomes more and more popular. Considering the ownership right of digital image, content provides want to devise and effective way to protect their intelligent property right. Digital watermarking, which protects legal copy and distribution of digital products, has been the hotspot of international academia. In this paper, we(More)
This paper proposes a novel intelligent intra-field interpolation for motion compensated deinterlacing. This method combines the advantage of cubic curve fitting interpolation and fuzzy edge interpolation to overcome resolution degradation caused by incorrect motion vector. The intelligent intra-field interpolation scheme alleviates resolution degradation(More)
Polar modulation techniques offer the capability of multimode wireless system and the potential for the high efficiency power amplifier (PA). Any input baseband complex signal is decomposed into magnitude and phase signal, and goes through envelope modulator and phase modulator respectively. The modulated envelope and phase message signals are combined and(More)
This paper proposes a hardware-efficient architecture design of wavelet-based adaptive visible watermarking. Our method adopts discrete wavelet transform (DWT) to embed visible watermarking. We perform this algorithm using hardware-efficient architectures that combine operational reduction and resource sharing techniques. Our method provides high quality(More)