The objective of this paper is to investigate a ultra-wideband (UWB) low noise amplifier (LNA) by utilizing a two-stage cascade circuit schematic associated with inductive-series peaking technique, which can improve the bandwidth in the 3 10 GHz microwave monolithic integrated circuit (MMIC). The proposed UWB LNA amplifier was implemented with both co-planer waveguide (CPW) layout and 0.15 μm G...

This work presents a ${D}$ -band monostatic radar system operating from 144.6 to 161 GHz, which is placed inside 3-D-printed low-cost case with built-in lens boost the antenna (ANT) directivity. The monolithic microwave integrated cir...

This article reports on a gallium-nitride (GaN) low-noise amplifier (LNA) monolithic microwave integrated circuit (MMIC) with 3-dB gain bandwidth (BW) from 63 to 101 GHz. The MMIC is fabricated in the Fraunhofer IAF 70-nm GaN-on-silicon-carbide (SiC) high-electron-mobility transistor (HEMT) technology. four-stage common-source LNA exhibits an average noise figure (NF) of 3 dB for measured frequ...

Accurate characterization of field effect transistors (FETs) is necessary for accurate design of monolithic-microwave integrated-circuit (MMIC). Extraction of FET parameters is difficult because the FET is embedded in the parasitic circuit, which is referred to as test element group (TEG), as shown in Fig.1 to connect probe and biases. De-embedding method using open/shortTEG [1] had been widely...

Knowledge of the temporal and spatial distribution of water vapor and liquid water in the troposphere is fundamental for shortand medium-range prediction of precipitation and severe weather. Current measurements of these quantities in the troposphere are limited by optical extinction in clouds (lidar), in temporal resolution (radiosondes), in spatial resolution (GPS networks) and in spatial cov...

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...

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....

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...

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...

Introduction: Millimetre-wave fibre wireless applications [1] could profit from a small antenna that can be fully integrated with the microwave and optical components of the system. This can lead to smaller and more cost-effective fibre-fed antenna units. Active integrated antennas [2] are another application that could benefit from a directly integrated antenna. Printed antennas are the obviou...