Time filter

Source Type

Chiou H.-K.,National Central University | Lin K.-C.,National Central University | Chen W.-H.,National Chip Implementation Center | Juang Y.-Z.,National Chip Implementation Center
IEEE Transactions on Circuits and Systems I: Regular Papers | Year: 2012

A 5 GHz double balanced mixer (DBM) is implemented in standard 90 nm CMOS low-power technology. A novel low-voltage self-bias current reuse technique is proposed in the RF transconductance stage to obtain better third-order intermodulation intercept point (IIP 3 ) and conversion gain (CG) when considering the process variations. The DBM achieves a CG of 12 dB, a noise figure (NF) of 10.6 dB and port-to-port isolations of better than 50 dB. The input second-order (IIP 2) and IIP 3 are 48 dBm and 4 dBm, respectively. Two I/Q DBMs are then integrated with a differential low-noise amplifier (DLNA) and a poly-phase filter, to from a direct-conversion receiver (DCR). The DCR achieves a CG of 26 dB with an NF of 2.7 dB at 21 mW power consumption from a 1 V supply voltage. The port-to-port isolations are better than 50 dB. The IIP 2 and the IIP 3 of the DCR are 33 dBm and -12 dBm, respectively. © 2011 IEEE.

Chen C.C.,National Chiao Tung University | Chen C.C.,National Chip Implementation Center | Lin Y.S.,National Chiao Tung University | Sang C.H.,National Chiao Tung University | Sheu J.-T.,National Chiao Tung University
Nano Letters | Year: 2011

We report a mask-free technique for the local synthesis of ZnO nanowires (NWs) on polysilicon nanobelts and polysilicon NW devices. First, we used localized joule heating to generate a poly(methyl methacrylate) (PMMA) nanotemplate, allowing the rapid and self-aligned ablation of PMMA within a short period of time (ca. 5 μs). Next, we used ion-beam sputtering to prepare an ultrathin Au film and a ZnO seed layer; a subsequent lift-off process left the seed layers selectively within the PMMA nanotemplate. Gold nanoparticles and ZnO NWs were formed selectively in the localized joule heating region. © 2011 American Chemical Society.

Lin C.-S.,National Chip Implementation Center | Chien T.-H.,Global UniChip Corporation | Wey C.-L.,National Central University
IEEE Transactions on Circuits and Systems II: Express Briefs | Year: 2011

Operating up to 5.5 GHz with 1-mW power consumption, a 90-nm CMOS programmable frequency divider with eight stages of new static D-flip-flop-based (2/1) divider cells is presented, where the supply voltage of 1.0 V is employed. The divider achieves a full modulus range from 1 to 256 and operates over a wide range maintaining up to 4 GHz with -30-dBm input power. The divider also accomplishes a power efficiency of 12.8 GHz/mW with 0.5-V supply voltage. It is favorable for advanced processes. © 2011 IEEE.

Yin T.-I.,Albert Ludwigs University of Freiburg | Zhao Y.,Albert Ludwigs University of Freiburg | Horak J.,Albert Ludwigs University of Freiburg | Bakirci H.,Albert Ludwigs University of Freiburg | And 4 more authors.
Lab on a Chip - Miniaturisation for Chemistry and Biology | Year: 2013

Cantilever sensors have been extensively explored as a promising technique for real-time and label-free analyses in biological systems. A major sensing principle utilized by state-of-the-art cantilever sensors is based on analyte-induced surface stress changes, which result in static bending of a cantilever. The sensor performance, however, suffers from the intrinsically small change in surface stress induced by analytes, especially for molecular recognition such as antigen-antibody binding. Through the contact angle change on a tailored solid surface, it is possible to convert a tiny surface stress into a capillary force - a much larger physical quantity needed for a practical sensor application. In this work, a micro-cantilever sensor based on contact angle analysis (CAMCS) was proposed to effectively enhance the sensitivity of a sensor in proportion to the square of the length to thickness ratio of the cantilever structure. CAMCS chips were fabricated using a standard complementary-metal-oxide-semiconductor (CMOS) process to demonstrate a 1250-fold enhancement in the sensitivity of surface stress to bioanalyte adsorption using a piezoresistive sensing method. A real-time and label-free troponin I (cTnI) immunoassay, which is now widely used in clinics and considered a gold standard for the early diagnosis and prognosis of cardiovascular disease, was performed to demonstrate cTnI detection levels as low as 1 pg mL-1. The short detection time of this assay was within several minutes, which matches the detection time of commercially available instruments that are based on fluorescence-labeling techniques. This journal is © 2013 The Royal Society of Chemistry.

Chang R.C.-H.,National Chung Hsing University | Lin C.-H.,National Chung Hsing University | Lin K.-H.,National Chin - Yi University of Technology | Huang C.-L.,National Chip Implementation Center | Chen F.-C.,Industrial Technology Research Institute of Taiwan
IEEE Transactions on Circuits and Systems I: Regular Papers | Year: 2010

Implementation of an iterative QR decomposition (QRD) (IQRD) architecture based on the modified Gram-Schmidt (MGS) algorithm is proposed in this paper. A QRD is extensively adopted by the detection of multiple-input-multiple-output systems. In order to achieve computational efficiency with robust numerical stability, a triangular systolic array (TSA) for QRD of large-size matrices is presented. In addition, the TSA architecture can be modified into an iterative architecture that is called IQRD for reducing hardware cost. The IQRD hardware is constructed by the diagonal and the triangular process with fewer gate counts and lower power consumption than TSAQRD. For a 4 × 4 matrix, the hardware area of the proposed IQRD can reduce about 41% of the gate counts in TSAQRD. For a generic square matrix of order IQRD, the latency required is 2m - 1 time units, which is based on the MGS algorithm. Thus, the total clock latency is only 10m - 5 cycles. © 2010 IEEE.

Lin S.-G.,National Chip Implementation Center
IEEE Microwave Magazine | Year: 2011

Taiwan lies off the southeastern coast of mainland Asia, across the Taiwan Strait from Mainland China. Taiwans total land area is only about 36,000 square kilometers (14,400 square miles); it is shaped like a leaf that is narrow at both ends. The total revenue of Taiwans IC design industry is currently the second in the world, only behind the United States. One of the driving forces of Taiwans IC design industry is the strong support from the government. The National Science Council (NSC) of the Executive Yuan (the executive branch of the government of the Republic of China) is the highest government agency responsible for promoting the development of science and technology. © 2011 IEEE.

Hsieh Y.-T.,National Cheng Kung University | Liu B.-D.,National Cheng Kung University | Wu J.-F.,National Chip Implementation Center | Fang C.-L.,National Chip Implementation Center | And 2 more authors.
IEEE Transactions on Power Electronics | Year: 2012

The grayscale resolution of liquid crystal displays (LCDs) can be improved by modulating the grayscale of the pixels in LCDs or by dimming the LCD backlight source. Changing the voltage or turned-on time of a pixel to achieve high-resolution grayscale requires either an accurate digital-to-analog converter or a very high frequency pulsewidth modulation (PWM) signal, which increases hardware cost and power consumption. The fast transient response of light-emitting diodes (LEDs) makes them useful as a backlight source for improving the grayscale resolution of an LCD without additional overhead. This paper presents an eight-channel LED backlight driver that can improve conventional dimming control circuits for LCDs. The proposed design was fabricated in a TSMC 0.25-μm 60-V bipolar-CMOS-DMOS process, and the chip area is 2.7 mm 2. A dimming ratio of 50000:1 is achieved with a 500-Hz PWM signal. The maximum power conversion efficiency, including power consumption of the LED current regulators, is 89.3%, when the load is a 12×8 LED array, the input voltage is 20 V, and the LED current is set to 25 mA. © 2012 IEEE.

Wei C.-L.,National Cheng Kung University | Lin C.-F.,National Chip Implementation Center | Tseng I.-T.,National Cheng Kung University
IEEE Sensors Journal | Year: 2010

A novel CMOS-process-compatible MEMS sensor for monitoring respiration is presented. This resistive flow sensor was manufactured by the TSMC 0.35 μm CMOS/MEMS mixed-signal 2P4M Polycide process. The sensor was demonstrated to be sensitive enough to detect the respiratory flow rate, and the relationship between flow rate and sensed voltage is quite linear. If one can integrate the sensor with its sensing circuit into a single chip, the cost of a pneumotach system can be greatly reduced. Moreover, the proposed sensor is useful in both invasive and noninvasive applications. © 2009 IEEE.

Yang K.-C.,National Chip Implementation Center | Wang J.-S.,National Tsing Hua University
IEEE Transactions on Computers | Year: 2012

This paper presents an Unequal Error Protection (UEP) method for streaming media. Previous researches have shown that UEP rateless codes can provide a low-complexity solution for downloading scalable information. However, the randomized generator of rateless codes leads to uncertainty of decoding probability and decoding priority of input data, and thus it is not suitable for streaming applications. In this paper, a novel UEP method is presented for streaming media. The proposed method, which consists of a hierarchical coding graph as well as low-complexity encoding and decoding operations, preserves the advantage of the UEP rateless codes and characterizes the decoding probability and decoding priority by formulas. The proposed hierarchical coding graph guarantees that high-priority input data are recovered before low-priority ones, so important information can be recovered with low latency, low computation, and high probability. In addition, data in different layers of the proposed UEP are dependently encoded, so that data in different layers can help decode each other. For heterogeneous clients, the proposed UEP codes can help a decoder with recovery of different amount of information according to the network condition and computation ability. Besides, we also extend the proposed UEP codes to a rateless version for downloading of media. Compared with the previous finite-length and rateless UEP codes, our method can recover more high-priority data even in serious packet loss rate (PLR), and the decoding order of data can be assigned by the server. © 2012 IEEE.

Hsiao C.-Y.,National Tsing Hua University | Hsu S.S.H.,National Tsing Hua University | Chang D.-C.,National Chip Implementation Center
IEEE Microwave and Wireless Components Letters | Year: 2011

This work presents a miniaturized bandpass filter in V-band using integrated passive device (IPD) technology with thick metal layers and Benzocyclobutene (BCB) dielectric on a glass substrate. The proposed filter, comprised of two stepped-impedance resonators with quarter-wave short-circuited stubs and floating pads, has low passband insertion loss and high stopband attenuation in a compact size. The fabricated filter has an insertion loss of 2.46 dB at the center frequency of 59 GHz, and a 3 dB bandwidth from 55.7 to 62.2 GHz. The core size of this filter is only 0.32 × 0.4 mm 2 (0.064 × 0.08 λ 0 2). © 2011 IEEE.

Loading National Chip Implementation Center collaborators
Loading National Chip Implementation Center collaborators