-We propose an efficient method to measure a pulse width using multiphase clock signals generated from a ring oscillator. These clocks, which have the same frequency and are evenly spaced, give multiple rising edges within a clock cycle. Thus, it is possible to measure a pulse width more accurately than with existing single clock-based methods. The proposed method is applied to a capacitive touch switch. Experimental results show that the capacitive touch switch with the proposed method gives a 118 fF resolution, which is 6.4 times higher than that of the touch switch with a single clock-based pulse width measurement method.

In this paper, we design a PCI Express controller for Endpoint. The controller supports full functionality of Transaction Layer and Data Link Layer of PCI Express. We also propose an efficient buffer management scheme to obey replay mechanism. We employ 80C51 to effectively manage designed functional blocks and implement Real-Time OS, MicroC/OS II on 80C51. We also code software under real time environment. This coded software fully covers the PCI Express protocols; supporting the replay mechanism, checking and generating error message, processing TLP acknowledgment, and management for exchanging Flow Control. For verification, we build a test bench including functional models of Host Bridge, Local Master, Local Slave, and Protocol Monitor. We also define the instructions to easily generate situations that it will occur in actual operation. We propose an effective verification to compliance and corner case testing using Reference Model, Random Generator, and Compare Engine. This verification environment is excellent to find error which it not detected by general test vector.

In this letter, phosphor-converted white lightemitting diodes (LEDs) were analyzed based on the singlecrystalline (SC) ZnO film/graphene quantum dots (GQDs) as phosphors with ultraviolet (UV) excitation. Color rendering index (CRI) and correlated color temperature (CCT) are found to be improved with injection current. The luminous efficiency of 245 lm/W at 260 mA has been achieved with 98 CRI and 5064 K CCT. The results show that the UV excited SC ZnO coated with GQDs white LEDs are more optically compatible for solid-state lighting, compared to the conventional blue chipexcited yellow phosphors LEDs.

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A BiF3 powder sample was prepared from the purchased Bi2O3 powder via the precipitation route. The photocatalytic performance of the prepared BiF3 powder was compared with the Bi2O3 powder and recognized as superior. The prepared BiF3 powder sample was added in a plaster of Paris (POP) matrix in the proportion of 0%, 1%, 5%, and 10% by wt% to form POP–BiF3(0%), POP–BiF3(1%), POP–BiF3(5%), and POP–BiF3(10%) composite pellets, respectively, and activated the photocatalytic property under the UV–light irradiation,in the POP. In this work, Resazurin (Rz) ink was utilized as an indicator to examine the photocatalytic activity and self-cleaning performance of POP–BiF3(0%), POP–BiF3(1%), POP–BiF3(5%), and POP–BiF3(10%) composite pellets. In addition to the digital photographic method, the UV–visible absorption technique was adopted to quantify the rate of the de-colorization of the Rz ink, which is a direct measure of comparative photocatalytic performance of samples.