The effect of UWB interference on the DCS-1800 and GSM-900 downlink is studied for different UWB power density. For high UWB power density (-70 dBm/MHz), the effect of UWB signals is very high when the distance between UWB transmitter and DCS-1800 receiver is less than 1 m. For low UWB power density (-100 dBm/MHz), the effect of the UWB signals is quasi null even if the distance between the UWB...

The spectral characteristics of a semiconductor laser are altered by injecting additional noise current into its currentdrive port. A continuously varying spectral linewidth from about 5 MHz to above 100 MHz is achieved experimentally in this semiconductor laser. The conditions under which the line shape changes from a standard Lorentzian shape to a Gaussian shape as functions of laser power an...

Fig.2 Amplifier under test. Amplifiers can operate in classes A, B, AB, C, D, E and F [2]. We tested class A amplifier made by „Microwave Power Devices“, Model: LWA 4690-1/1837, based on bipolar devices (Fig.2). Usually, 1dB compression point, gain and two-tone third-order intercept point are measured as the amplifier figure of merit. As specified by manufacturer, the frequency range of the amp...

The Advanced Photon Source (APS) is a 7-GeV full energy positron storage ring for generating synchrotron radiation with an injector. The booster synchrotron rf system consists of a single 1-MW klystron which drives four five-cell cavities at 352 MHz. The storage ring cavities consist of four groups of four single cells powered by two 1-MW klystrons for 100-mA operation. An overview of the opera...

This paper presents design of a low-power 100 MHz analog FIR filter for PRML equalization used in the read channel of hard disk drives. The chip consists of 16 channels to provide 15-tap FIR filter operation. By using rotating clocks for sample/hold operation with one dummy channel, timing constraints can be relieved, which results in low-power consumption. The chip incorporates the parallel ar...

Atsushi Nishizawa,* Seiji Kawamura, Tomotada Akutsu, Koji Arai, Kazuhiro Yamamoto, Daisuke Tatsumi, Erina Nishida, Masa-aki Sakagami, Takeshi Chiba, Ryuichi Takahashi, and Naoshi Sugiyama Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan TAMA Project, National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan Department of Astronomy, Scho...

A low-power quadrature direct digital frequency synthesizer (DDFS) is presented. Piecewise linear approximation is used to avoid using a ROM look-up table to store the sine values in a conventional DDFS. Significant saving in power consumption, due to the elimination of the ROM, renders the design more suitable for portable wireless communication applications. To demonstrate the proposed techni...

We report on an 100 MHz repetition rate integrated photonic transmitter at 850 nm with arbitrary amplitude and polarization modulation. The source is suitable for free-space quantum communication links, in particular for quantum key distribution applications. The whole transmitter, with the optical and electronic components integrated, has reduced size and power consumption. In addition, the op...

ABSTRACT This paper provides analyses of the emission beam structure 76 ‘B’-named pulsars within Arecibo sky. Most these objects are included in both Gould & Lyne and LOFAR High Band surveys thus complement our other works treating various parts populations. These comprise a further group mostly well-studied sky that we here treat similarly to those Olszanski et al. – extend overall efforts...