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Université de Neuchâtel

0.35 μm 22μW Multiphase Programmable Clock Generator for Circular Memory SC FIR Filter For Wireless Sensor Applications

Dlugosz, Rafal Tomasz ; Iniewski, K. ; Talaśka, T.

In: IEEE Workshop on Signal Processing Systems (SIPS), 2006, vol. IM3, no. M3-5, p. 157-160

The paper presents the programmable multiphase clock generator for switched-capacitor finite impulse response (SC FIR) circular memory filters. The proposed programmable clock circuit enables easy division of such kind of filters into different orders smaller sections, which when connected in series, lead to increase in filter efficiency: reduction of chip area, power dissipation, and rising up...

Université de Neuchâtel

1,1′-Ferrocene dicarboxylic acid pyridin-4-yl ester: A new bidentate ligand in arene ruthenium chemistry

Auzias, Mathieu ; Therrien, Bruno ; Süss-Fink, Georg

In: Inorganic Chemistry Communications, 2007, vol. 10, no. 11, p. 1239-1243

1,1′-Ferrocene dicarboxylic acid pyridin-4-yl ester (1) is prepared from 1,1′-ferrocene dicarbonyl chloride and 4-hydroxypyridine. This new bidentate ferrocenoyl ligand reacts with the monocationic complex [(η6-p-cymene)2Ru2 (μ-OH)3]+ to give the dicationic complex...

Université de Neuchâtel

1,2-Bis-N-[2’-(diphenylphosphanyl)benzoyl]diaminobenzene, a New Chelating Ligand with Versatile Coordination Properties

Burger, Sylvain ; Therrien, Bruno ; Süss-Fink, Georg

In: European Journal of Inorganic Chemistry, 2003, vol. 17, p. 3099 - 3103

1,2-Bis-N-[2’-(diphenylphosphanyl)benzoyl]diaminobenzene (dppbH; 1) was prepared by peptidic coupling and shown to exist, in the solid state, in the form of hydrogen-bonded dimers by single-crystal X-ray structure analysis. As expected, 1 reacts with [MCl2 (cod)] (M = Pd, Pt; cod = cyclooctadiene) to form square-planar complexes. However, in the case of palladium...

Université de Neuchâtel

1,3-Butadienyl-thiocyanate in der Diels-Alder-Reaktion mit anschliessender [3,3]-sigmatroper Umlagerung = 1,3-Butadienyl Thiocyanates in the Diels-Alder Reaction Followed by a [3,3|-Sigmatropic Shift

Huber, Stefan ; Stamouli, Peristera ; Jenny, Titus ; Neier, Reinhard

In: Helvetica Chimica Acta, 1986, vol. 69, no. 8, p. 1898-1915

(E)- and (Z)-1,3-Butadienyl thiocyanates 3, 4, and 12-15 have been synthesized selectively. Their use as dienes for Diels-Alder reactions followed by a [3,3]-sigmatropic shift to obtain an isomeric isothiocyanate has been studied. The butadienyl thiocyanates are, unfortunately, not very reactive in Diels-Alder reactions. This disadvantage can be overcome,...

Université de Neuchâtel

1,3-Dipolar cycloadditions : click chemistry for a new synthesis of 5-substituted tetrazoles and applications in organocatalysis

Aureggi, Valentina ; Neier, Reinhard (Dir.) ; Sedelmeier, Gottfried (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2007 ; Th.1959.

Tetrazoles are a class of heterocycles with a wide range of applications in medicinal chemistry and in material sciences 1. However a versatile method to synthesize tetrazoles through safe protocols is still highly desirable. Indeed each of the general known procedures uses either toxic metals, expensive reagents, harsh reaction conditions and may lead to the formation of dangerous hydrazoic acid...

Université de Neuchâtel

1.55 µm InAs/GaAs Quantum Dots and High Repetition Rate Quantum Dot SESAM Mode-locked Laser

Zhang, J. Y ; Oehler, A. E. H ; Resan, B ; Kurmulis, S ; Zhou, K. J ; Wang, Q ; Mangold, Mario ; Südmeyer, Thomas ; Keller, Ursula ; Weingarten, K. J ; Hogg, R. A

In: Scientific Reports, 2012, vol. 2, p. # 477

High pulse repetition rate (≥10 GHz) diode-pumped solid-state lasers, modelocked using semiconductor saturable absorber mirrors (SESAMs) are emerging as an enabling technology for high data rate coherent communication systems owing to their low noise and pulse-to-pulse optical phase-coherence. Quantum dot (QD) based SESAMs offer potential advantages to such laser systems in terms of reduced...

Université de Neuchâtel

16.5 µm quantum cascade detector using miniband transport

Giorgetta, Fabrizio R. ; Baumann, Esther ; Graf, Marcel ; Ajili, Lassaad ; Hoyler, Nicolas ; Marcella Giovannini ; Faist, Jérôme ; Hofstetter, Daniel ; Krötz, Peter ; Sonnabend, Guido

In: Applied Physics Letters, 2007, vol. 90, no. 231111, p. 1-3

The authors report on an InP based photovoltaic quantum cascade detector operating at 16.5 µm and using miniband-based vertical transport. This concept allowed the construction of a longitudinal optical phonon extraction stair with two rungs without touching on a high device resistance. At 10 K, they observed a responsivity of 1.72 mA/W and a Johnson noise limited detectivity of 2.2×109...