A systematic study of post-metallization annealing (PMA) effect on the quality thermal SiO/sub 2/ p-type 6H- and 4H-SiC has been carried out. simultaneous quasi-static hi-lo frequency capacitance-voltage method employed to measure total effective oxide charge (N/sub eff/) interface state density (D/sub it/). To ensure accurate results, D/sub it/ was measured at 350/spl deg/C which, depending hole capture cross sections, should enable measurement states located in band gap as deep 1.3-1.5 eV...

The first 4H-SiC avalanche photodiode for visible-blind UV applications has been designed and fabricated successfully. device structure is described the photo-responsivity characteristics presented. observation of a positive temperature coefficient an breakdown voltage up to 257°C also discussed.

The first demonstration of 4H-SiC power bipolar junction transistors is reported. detailed device structure along with the multi-step termination extension design dimensions described. DC I–V characteristics at room temperature and 250°C fabricated are measured

A Monte Carlo particle (MCP) bipolar model for 4H-SiC consisting of three electron and two hole bands is developed to simulate the millimetre wave power generation by IMPATT diodes. Validation provided comparing (i) carrier transport properties with full band simulation results (ii) impact ionization coefficients most recent experimental results. MCP are reported a low-voltage diode connected directly in parallel resonant circuit standard 50 O load resistor. The detailed evolution...

This work reports the development of high power 4H-SiC bipolar junction transistors (BJTs) by using reduced implantation dose for p+ base contact region and annealing in nitric oxide base-to-emitter passivation 2 hours at 1150/spl deg/C. The transistor blocks larger than 480 V conducts 2.1 A (J/sub c/=239 A/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) V/sub ce/=3.4 V, corresponding to a specific on-resistance (R/sub sp on/) 14...

A dual-band wide range LC voltage controlled oscillator (VCO) with highly linear frequency tuning characteristics for GNSS application is presented. The linearity of VCO includes the coarse and fine sensitivity variations, which are defined as step per-code (fstep) variation gain (KVCO) variation, respectively. Compared to conventional circuit topology, proposed utilizes 4-bit (Bit<3:0>) digital signal control a varactors array instead switched capacitors bank realize tuning. And also...

This letter reports the design and fabrication of 4H-SiC bipolar junction transistors with both high voltage (>1kV) dc current gain (/spl beta/=32) at a collector level I/sub c/=3.83A (J/sub c/=319 A/cm/sup 2/). An Al-free base ohmic contact has been used which, when compared BJTs fabricated Al-based contact, shows clearly improved blocking voltage. A specific on-resistance 17 m/spl Omega//spl middot/cm/sup 2/ achieved for densities up to 289 2/.

Saving power in datacenter networks has become a pressing issue. While operation, ElasticTree and CARPO can save consumed by fat-tree network using sleep mode where some components such as ports switches are turned off when traffic demand the is relatively moderate. In this paper, we propose new approach exploring design stage of focus on how to choose right switch size that potentially most during expected operation network. We also consider speed scaling be varied adjusting its processing...

High-definition multimedia interface (HDMI1.3) specifies video serial link that operates from as low 250 Mb/s to 3.4 Gb/s with coverage over different data formats. Wide-spread consumer adoption of the new HDMI standard demands receivers reliably reproduce incoming stream under conditions either short/long cables or clear/fuzzy signal. In many cases, input signal could be quite smeared and noisy when a cheap cable is used for cost saving. To satisfy wide range operation conditions, presented...

Saving power in datacenter networks has become a pressing issue. ElasticTree and CARPO fat-tree have recently been proposed to reduce consumption by using sleep mode during the operation stage of network. In this paper, we address design where right switch size is evaluated maximize saving expected Our findings reveal that deploying large number small switches more power-efficient than when traffic demand relatively moderate or servers exchanging are close proximity. We also discuss impact...

Abstract In this paper, a lightweight high-efficiency circularly polarized (CP) all-metal antenna design method is presented for satellite industry applications. The proposed composed of rectangular waveguide feeder, high-order mode cavity and metasurface circular polarizer (MCP). TE 440 directly excited by four coupling slots in the waveguide. MCP placed on to generate CP radiation. Due introduction technology MCP, all metal walls inside can be removed, which are necessary conventional...

A high voltage 4H-SiC bipolar junction transistor (BJT) has been developed with 16 A, 600 V rating. This paper presents a new base drive structure for the SiC BJT inverter application. The driver consists of one IGBT and MOSFET to help turn-on turn-off in Darlington like configuration. Instead using conventional proportional current driven method optimal driving transistor, proposed can adaptively at near-saturated condition based on balance V/sub be/ ce/. gated (IMGT) significantly improve...

This paper presents two novel methodologies related to multiple elimination on land seismic data. The first one is based a model-based algorithm that takes into account the unique characteristics of datasets. It operates entirely in time-offset domain and thus avoids artifacts associated with conventional multi-channel transforms. second methodology full data-driven, automated approach firmly rooted principles inverse data technology targets internal multiples. Internal multiples are...

This paper reports the demonstration of a hybrid Darlington bipolar junction transistor (BJT) with high current gain and power handling capability substantially higher than level previously reported SiC BJTs. The has been tested up to collector 23.5 A BV/sub ceo/ 500 V, showing large-signal dc common emitter (/spl beta/) 430 an ac 650. Also for first time are characteristics ambient temperature 150/spl deg/C as well inductively loaded half-bridge inverter switching characteristics....

An all-metal circularly polarized slotted waveguide antenna is demonstrated in this work. Compared with the traditional adopting power division network, and polarization converter, proposed only composed of a high-order mode feeding cavity several radiation waveguides etched T-shaped slots, resulting low profile height while maintaining good performance. Our operating near 19GHz, −10dB S <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf>...

4H-SiC avalanche photodiodes (APDs) are fabricated with a multistep junction termination extension. The leakage current density has been dramatically reduced to as low 1 µA/cm2 and photo-responsivity up 105 A/W achieved. APDs can run very stably at power densities 104 W/cm2.

Summary In recent years, with the discovery of oil and gas in deepwater area South China Sea, huge exploration potential this has been confirmed. However, considering low level ghost problem area, seismic reservoir prediction result great uncertainty which makes high-cost drilling at a risk. Therefore, it is urgent to develop high-fidelity hydrocarbon detection technique without well constraints. paper, we proposed an integrated method combines inversion frequency attribute based liquid...

In this work, a scheme of multi-frequency simulation combining with search method is demonstrated, realizing the prediction for multi-carrier passive intermodulation (PIM) products. Providing convenient way to study PIM products, and obtain distribution them quickly accurately. Moreover, overcomes complexity spectrum in case multi-carrier, showing great potential high-power, broadband multi-channel communication systems.