High-speed retiming circuit using a dielectric resonator filter are proposed. An active band-pass filter with a dielectric resonator filter suppresses the dielectric resonator filter's inherent higher resonance modes and successfully extracts an 8-GHz timing clock.

Switched-Capacitor (SC) low-pass ladder filters based on the LDI transformation, have been successfully designed using the Lossless Discrete Integrators (LDIs) as their basic building blocks. However, the design of highpass ladder filters with the LDIs are not straightforward as the low-pass or bandpass case. On the other hand, a high-pass design is achieved easily by using a differentiator as the building block, instead of an integrator. Thus, a new design technique of Switched-Capacitor Modified Lossless Discrete Differentiators (MLDDs) is proposed in this paper. By using them as the basic building block, SC high-pass ladder filters are directly constructed based on the low-pass to high-pass transformation. Furthermore, a fully-differential architecture is applied to this MLDD design, and some MLDD alternatives are investigated for high-frequency and time-sharing applications.

In this paper, we introduce the concepts of multi-node and mono-node to expand the expansive graph grammar given by Shi and Fu to a larger family, the family that contains all rooted acyclic directed graphs. Shi and Fu's approach deals with rooted acyclic digraphs containing only mono-nodes. The ways of numbering and representing rooted acyclic directed graphs are modified and grammars for such graphs are given so that directed graphs containing even multi-nodes can be treated. Parsing algorithms are also given which are described with State-Space representation. Our algorithms are as efficient as those of Ref.(6). We have removed a constraint that the basis graph must be a tree from the expansive graph grammars of Ref.(6) without increasing the space or time complexity of numbering, rewriting and parsing.

The high performance and versatile electronic volume IC has been realized by the 15 V high voltage Bi-CMOS process. Mixed use of bipolar and MOS devices has introduced new functions such as buffer amplifiers, a low level oscillator, a temperature compensated D/A converter and a reference voltage generator.

Effect of the shape of contact surface on the contact resistance property of contaminated surface was examined in conjunction with the radius of curvature of the hemisphere contact surface. As the results, the dependence of the radius of curvature on the contact resistance was found. And the existence of the radius which gives maximum contact resistance was also found.

Optical characteristics of the Bragg filter fabricated with a Ta2O5/SiO2 optical waveguide are studied. The Bragg reflector was formed by the holographic method using an He-Cd laser. Filter responses were measured with the color-center laser and the stopband bandwidth was found to be 3.5 Å.

This letter presents a method for real-time visualization of static electricity distribution which can be achieved by rapidly measuring the voltages induced on the array electrodes. For verifying the validity of this method, the measurement examples on the charged sheets are demonstrated.

Two fast parallel sorting algorithms on a mesh-connected model are described. These algorithms are some combinations of row and column sorts, and use just the compare-exchange as their basic operation. The computing time of the first algorithm for sorting n2 items is 6.5n+2 log n-5 steps and the computing time of the second one is not more than 5.5n+0.5 log n+0.5 +1.5 log n-3 steps. The control structures of these algorithms are particularly simple. The correctness of the algorithms are proved in a lucid way by using a function POTENTIAL. The function evaluates the exact number of steps to sort items by parallel bubble sort.

A new type of a dynamic-single-mode laser, which has distributed reflector (DR) both in active and passive regions, is proposed and analyzed to attain high output efficiency with the superior single mode property without increase of threshold current density.

We fabricated a-Si: H thin films outside the microwave discharge plasma and we varied the substrate bias to investigate the effect of ion bombardments of the film surface. Dark conductivity of the film decreases with increasing negative bias of the substrate with no dependence on the substrate temperature.

A multimode variable directional coupler has been fabricated by piling up films. It uses an electrostrictive element. The output powers can be continuously controlled over a wide range. The output powers from the two output ports of the coupler were equalized at a stress of 16.8 kg/cm2, and the loss due to the stress was small (0.19 dB).

An electron-wave device consisting of a hot electron transistor structure with a transversal potential grating in a base region is proposed. A reduced transit time and extremely small charging times provide significant potential for high-speed operation.

This letter presents the results of Auger analysis of surface products by steady arc on Ag/Pd contacts. Black products formed on Ag contact surfaces, which make contact resistance high and unstable, are silver oxide. In the case of Pd contacts, contact resistance of which remains low and stable, white-colored products seen after operations seem to be powdery palladium.

A heterodyne interferometer utilizing a light source with short coherence length has led to a significant improvement in distance resolution of an optical reflectometer. The resolution less than 1 cm along a fiber is easily achieved by a Fabry-Perot type diode as a short coherence length source.

Relationships between temperature and specific gravity of methanol solution of urea were measured under various concentration. Solubility and supersolubility curves to methanol were obtained. It was found that methanol is relatively suitable as solvent to the growth of urea crystal.

Using an improved calculation method, the transmission coefficient of a quadruple barrier resonant tunneling diode is calculated. Using this result, extreme values of the transmission coefficient and the full widths at half maximum (FWHM) of the resonant peaks are calculated. It is shown that the first terms of the expressions |θ|, which are proportional to the FWHM, are given by the same formula in double, triple, and quadruple barrier diodes.

Thermal properties of InGaAlP laser diodes have been analyzed by computer simulation. Self-consistent analysis considering heat conduction, current distribution and optical waveguide mode has made it clear that there exist optimum structural parameters minimizing the threshold current.

Y-Ba-Cu-O films sputter-deposited at about 650 in high oxygen concentration gas are superconductive without heat treatment after the deposition. The films of 700 nm thickness have Tc end of 72 K on SrTiO3 and 65 K on sapphire substrates. Reduced interdiffusion, compared with post-annealed films at high temperatures, between the film and the substrate is confirmed.

A simple length measuring method for single mode fiber coiled around a drum using Sagnac effect, is proposed. Phase difference variation caused by rotating the coil is measured, and fiber length can be derived by processing the measured results. Typically, a length measurement accuracy of 1% is obtained.

Axisymmetric modes of axisymmetric resonant cavities are studied by using the hybrid boundary element method (H-BEM). We can see that H-BEM solutions have high accuracies from comparison of numerical solutions with exact solutions. It is shown that H-SEM is useful to study axisymmetric modes of axisymmetric cavities.