Transit-time broad-banding of very high bandwidth monolithic p-i-n/HBT optical receivers

1992 ◽  
Vol 4 (9) ◽  
pp. 1015-1017 ◽  
Author(s):  
M. Govindarajan ◽  
S.R. Forrest
Keyword(s):  
Transit Time ◽  
Optical Receivers ◽  
High Bandwidth ◽  
Very High ◽  
Broad Banding

A 25 Gbps VCSEL driving ASIC: an attempt for ultra-high-speed front-end readout applications

2022 ◽  
Vol 17 (01) ◽  
pp. C01040
Author(s):  
C. Zhao ◽  
D. Guo ◽  
Q. Chen ◽  
N. Fang ◽  
Y. Gan ◽  
...  
Keyword(s):  
High Speed ◽  
Cmos Technology ◽  
Test Results ◽  
Eye Diagram ◽  
Optical Links ◽  
Optical Module ◽  
Active Feedback ◽  
High Bandwidth ◽  
Output Driver ◽  
Very High

Abstract This paper presents the design and the test results of a 25 Gbps VCSEL driving ASIC fabricated in a 55 nm CMOS technology as an attempt for the future very high-speed optical links. The VCSEL driving ASIC is composed of an input equalizer stage, a pre-driver stage and a novel output driver stage. To achieve high bandwidth, the pre-driver stage combines the inductor-shared peaking structure and the active-feedback technique. A novel output driver stage uses the pseudo differential CML driver structure and the adjustable FFE pre-emphasis technique to improve the bandwidth. This VCSEL driver has been integrated in a customized optical module with a VCSEL array. Both the electrical function and optical performance have been fully evaluated. The output optical eye diagram has passed the eye mask test at the data rate of 25 Gbps. The peak-to-peak jitter of 25 Gbps optical eye is 19.5 ps and the RMS jitter is 2.9 ps.

Engine Start Simulation on an Engine Transient Test System: Hardware and Controls

2007 ◽  
Author(s):  
Brian D. Krosschell ◽  
Stephen J. Klick ◽  
John J. Moskwa
Keyword(s):  
Cold Start ◽  
Testing Procedure ◽  
Test System ◽  
Stiff System ◽  
Powertrain Control ◽  
Single Cylinder Engine ◽  
Control Research ◽  
High Bandwidth ◽  
Very High ◽  
Engine Start

The goal of this research is to use a hydrostatic transient dynamometer combined with new control techniques to replicate multi-cylinder engine dynamics which occur while the engine is started by an electric starting system. The transient engine dynamometer test system in the Powertrain Control Research Laboratory (PCRL) uses a torque tube and extremely stiff driveline in order to provide a very high bandwidth of torque actuation. The design and nature of this low inertia, stiff system requires that a standard electrical starting system be omitted. One of the objectives of this research was to assemble a new engine on the hydrostatic dynamometer and model the starting dynamics which occur during an engine cold start. The other objective was to verify and compare data collected by the PCRL and Ford to validate testing. This information will then be used in support of development of a cold start testing procedure on the single-cylinder engine transient test system in the PCRL.

scholarly journals The Ripple Cancellation Technique Applied to a Synchronous Buck Converter to Achieve a Very High Bandwidth and Very High Efficiency Envelope Amplifier

2014 ◽  
Vol 29 (6) ◽  
pp. 2892-2902 ◽  
Author(s):  
Daniel Diaz ◽  
Oscar Garcia ◽  
Jesus Angel Oliver ◽  
Pedro Alou ◽  
Zoran Pavlovic ◽  
...  
Keyword(s):  
High Efficiency ◽  
Buck Converter ◽  
High Bandwidth ◽  
Ripple Cancellation ◽  
Very High

scholarly journals A survey on advanced transmission technologies for high bandwidth and good signal quality for high-speed railways

2021 ◽  
Vol 23 (1) ◽  
pp. 293
Author(s):  
Abdul Rafay ◽  
Sevia Mahdaliza Idrus ◽  
Kamaludin Mohamad Yusof ◽  
Siti Hasunah Mohammad
Keyword(s):  
High Speed ◽  
Multiple Input Multiple Output ◽  
Satellite Networks ◽  
Signal Quality ◽  
High Penetration ◽  
Multiple Input ◽  
Input Multiple Output ◽  
High Bandwidth ◽  
Good Signal ◽  
Very High

Ahigh-speedrailway (HSR) has gained very high popularity for passengersdue to the fast, reliable, economical and convenient during traveling a verylong-distance journey. Thedemandfor advancedbroadbandservices such aswatching4K movies, cloud computing andonline gaming, has exponentiallyincreased fortravelerson thehigh-speedtrain(HST).The HSTcan’t providegood bandwidth to facilitate these services for travelers via existingtechnologies such as cellular networksand satellite networks because offrequent handoffs, high penetration and fading.So, the bandwidth degradesdramatically due to these issues. Research workers have developed proposalsto handle these problems by advanced transmission technologies for HSR.Until now,varioustransmissionschemeshave beensuggestedby researchworks with thefocusfor either high bandwidth or signal qualityimprovement. This paper presents a survey on advanced transmissiontechnologies for high bandwidth and good signal quality. In this paper, acomprehensive survey of the appropriate literature published that concentrateon advanced transmission methods in HSR communications in getting higherbandwidth efficiency and maximize the signal quality is presented. Advancedtransmission method can be categorized into orthogonal frequencydivisionmultiplexing (OFDM), multiple-input multiple-output (MIMO) and radio-over-fiber (RoF).

Noise reduction in digitized images

1986 ◽  
Vol 44 ◽  
pp. 878-879
Author(s):  
K. K. Christenson
Keyword(s):  
Total Conversion ◽  
Analog To Digital ◽  
X Ray ◽  
Large Fluctuations ◽  
High Bandwidth ◽  
Conversion Time ◽  
The Mean ◽  
Signal Changes ◽  
Electron Microscopes ◽  
Very High

In order to produce useable images at high scan rates, the detectors on modern electron microscopes often have a very high bandwidth (short response time to signal changes). This bandwidth makes the signal noisey; the signal has large fluctuations about the mean. Because the film integrates the signal this noise is not a problem when photographing an image. But it causes an annoying blurring of the trace In slow y-modulated line scans and can result in large errors if the signal if measured with a fast analog to digital converter (ADC).We interfaced an EDAX 9100/70 x-ray analyzer with a PV9242 line scan/mapping option to a Philips EM420 STEM. The EDAX unit controls the x-y raster and digitizes the detector signal at each pixel. When reading the raw signal from the standard Philips SED detector and amplifier the images were very noisy. This is because the ADC actually samples the signal for a very small portion of the total conversion time and then holds the sampled value for the actual conversion, effectively reading the signal for 0.3 usee out of 170 usec.

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