In this paper, we demonstrate a monolithic integrated micro direct methanol fuel cell (μDMFC) for the first time. The monolithic integrated μDMFC combines proton exchange membrane (PEM) and Pt nanocatalysts, in which PEM is achieved by the functionalized porous silicon membrane and 3D Pt nanoflowers being synthesized in situ on it as catalysts. Sulfo groups functionalized porous silicon membran...

A highly integrated frequency quadrupler MMIC that uses three-dimensional MMIC (3D-MMIC) technology is presented. It consists of four driver amplifiers, two doublers, and a 2-band elimination filter. These seven circuits are integrated in only a 2.36 mm2 area. The filter sufficiently suppresses spurious output components. The third and fifth harmonic components, which are the spurious component...

近年のミリ波帯無線技術の目覚ましい発展は車載 レーダの実用化及び普及をもたらし,車載レーダの需 要は現在も増加傾向にある.またミリ波帯無線技術を 用いた路車間通信,車車間通信といった高度交通情報 システムの実用化を目指した開発が進められており, ミリ波帯無線装置の更なる高性能化及び低コスト化に 向けた研究が活発に行われている [1], [2]. 無線装置における高周波電気信号の発生源となる発 振器の諸特性は,無線装置全体の性能に影響を及ぼす. これまで発振器は出力周波数,位相雑音,変調範囲と いった特性が重視されてきた.位相雑音は通信システ ムやレーダシステムのエラーレートに影響を及ぼすた め,より低位相雑音の発振器が求められている.また 無線装置の構成は信号源である発振器の出力周波数に 大きく左右される.発振器の出力周波数が低い場合に は,無線装置は逓倍器を必要とし複雑な構成となる...

In order to meet the demand for mass production of 77GHz automotive radar systems, a low cost and high performance 38/77GHz AlGaAs/InGaAs PHEMT MMIC transmit amplifier with a multiplier has been realized. The chip is packaged in an inexpensive conventional non-hermetic package. Excellent power performance is demonstrated with a 15 dBm output power and 7 dB maximum conversion gain from 38 to 76....

Electronic circuit design typically begins with an assumption that the components are operating at ambient temperature. Monolithic Microwave Integrated Circuit (MMIC) design, in particular, violates this as the DC current fl owing through the ever-shrinking devices induces heating to two, three, or even four times greater temperature (in oC). Such a large departure from assumed room temperature...

This paper mainly introduces the Wideband 5-bit MMIC digital attenuator with high precision. Firstly, the theories of basic GaAs digital attenuator MMIC’s configurations are searched. Secondly, every possible configuration is contrasted, subsequently, appropriate topology is selected for each stage. This attenuator has been realized by 0.5!m GaAs pHEMT process. Simulation results of the digital...

This paper presents the progress of monolithic technology for microwave application, focusing on gallium nitride technology advances in the realization of integrated power amplifiers. Three design examples, developed for microwave backhaul radios, are shown. The first design is a 7 GHz Doherty developed with a research foundry, while the second and the third are a 7 GHz Doherty and a 7–15 GHz d...

Silicon photonic waveguides are promising in small-footprint low-cost monolithic photonic integrated circuits with capability of high-yield mass production using large-diameter wafers. Design, fabrication and performance characterization of a small-footprint monolithic dualpolarization quadrature phase-shift keying silicon-based optical modulator for digital coherent communication, which plays ...

The worldwide diffusion of wireless telecommunication systems opened new perspectives for microwave technologies. High-volume microwave monolithic integrated circuit (MMIC) production became a reality, revolutionizing the approach to microwave-circuit design. Nowadays, this is based on the intensive use of accurate simulation and computer-aided-design (CAD) tools. While scattering parameter mea...