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Communications

What is Pulse Shaping?

Pulse shaping, as it is done today, is an effort to fix fidelity issues caused by the transmitting amplifier and is accomplished by a combination of imperfect methods, most external to the amplifier. This article...

Briefs
Transportation

New Family of Glass for Lens Applications

A new composition of germanosili-cate glass created by adding zinc oxide has properties good for lens applications. The new family of zinc germanosilicate glass has a high refractive index comparable...

Briefs
Photonics/Optics

Optical Signal Amplifying Technique

Optical Signals can be retrieved from inherent background noise using Talbot effect to amplify them.

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Manufacturing & Prototyping

Method Recharges an Electric Car as it Drives

This practical technique uses magnetism to transmit electricity wirelessly to recharge electric cars, robots, or drones.

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Sensors/Data Acquisition

Unique Amplifier Could Change Optical Communication

Researchers at Chalmers University of Technology have developed an optical amplifier that they expect will revolutionize both space and fiber communication.

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Software

Ka-Band Front-End Monolithic Microwave Integrated Circuits (MMICs) and Transmit/Receive (T/R) Modules Testing

Gallium nitride monolithic microwave integrated circuit (MMIC) technology has superior performance in power amplifier applications.

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Aerospace

Sensitive Optical Receivers for Space

This concept could help break through the present-day data-return bottleneck in deep space missions.

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Communications

Cascaded Offset Optical Modulator

This subsystem is used in free-space optical communications and fiber-optic communications.

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Defense

Quantum Sensor Enables Wide Spectral Coverage

The sensor could provide a way to detect communication signals over the entire radio frequency from 1 to 100 GHz.

Briefs
Semiconductors & ICs

Radiation-Hardened Gain Digitizer

This instrument has applications in medical equipment, robotics, and satellites.

Articles
RF & Microwave Electronics

90° Hybrid Coupled Power Amplifier – Pros and Cons

Wireless communications is a broad market and PAs fill a wide array of those applications.

Briefs
Photonics/Optics

Free-Space Fiber Optic Laser Rod

This approach removes the limitation on peak power densities that exists for fiber lasers.

Articles
RF & Microwave Electronics

Solid-State Microwave Power Module

The MPM has uses in military aerospace applications.

Articles
Semiconductors & ICs

Broadband 1.2- and 2.4-mm Gallium Nitride (GaN) Power Amplifier Designs

The US Army Research Laboratory (ARL) has been working with Raytheon to design efficient, broadband, linear, high-power amplifiers and robust, broadband, low-noise...

Briefs
Test & Measurement

Hybrid, Wide-Range Detector Amplifier

Many applications require detection of both very small and very large signals. High-gain detector amplifiers provide low noise, but are easily swamped by large signals. Logarithmic amplifiers provide a...

Briefs
Test & Measurement

Gated Chopper Integrator (GCI)

Microvolt-level signals require gains of at least a thousand. Offsets and noise in the amplifier chain will be amplified by the same amount, which can saturate the amplifier or swamp the signal so it is not resolvable. Other methods use chopping and/or autozero techniques to lower the offset and noise. The key...

Articles
Test & Measurement

Simplifying Access to High Energy Sub-5-fs Pulses

In order to make ultrafast pulses accessible to the broadest possible field of applications, Coherent has been implementing a comprehensive program of design methodologies, materials...

Articles
Electronics & Computers

Compact Power Amplifier Solution for Electronic Warfare

Wolfspeed, a Cree company, provides field-tested silicon carbide (SiC) and gallium nitride (GaN) power and RF solutions. As a leader in wide-bandgap semiconductor technology, Wolfspeed...

Briefs
Manufacturing & Prototyping

Auto-Zero Differential Amplifier

Engineers in the NASA Goddard Space Flight Center Instrument Electronics Development Branch have developed a chopper-stabilized auto-zero amplifier capable of amplifying signals with extremely small amplitude originating from a thermopile-based infrared (IR) sensor. The instrument is self-adjusting in that it...

Features
Medical

Using Air Gaging for Measurement of Orthopedic Devices

For patients, high-quality orthopedic components mean that implants can be kept for as long as possible, reducing or even eliminating the need for further procedures down the road. In...

Briefs
Energy

High-Power Solid-State Power Amplifier System

NASA Marshall Space Flight Center (MSFC) has developed a High-Power Solid-State Power Amplifier System that combines 1-KW modules (16 amps total) to generate up to 16KW of radio frequency (RF) power from 230 MHz. The NASA device is a first step toward increasing the power of solid-state power amp...

Briefs
RF & Microwave Electronics

Remote Detection of Electronic Devices

Non-Linear Junction Detection is a well-known technique for detecting electronics that utilize semiconductor (solid-state) junctions. The current state of the art for finding hidden electronics — such as electronic eavesdropping devices — using this technology has a maximum range of about 2 m, and more...

Briefs
Energy

Wireless Charging of Moving Electric Vehicles

If electric cars could recharge while driving down a highway, it would virtually eliminate concerns about their range and lower their cost, perhaps making electricity the standard fuel for vehicles. Researchers have wirelessly transmitted electricity to a nearby moving object, which could advance...

Briefs
Communications

Paper-Thin Device Acts as a Loudspeaker and Microphone

A paper-thin, flexible device was created that can generate energy from human motion, and can act as a loudspeaker and microphone. The transducer is ultrathin, flexible, scalable, and...

Articles
Aerospace

GaN Breaks Barriers

The increasing demand for higher data rates in telecommunications and higher resolution in industrial systems is pushing the frequency of operation higher for the electronics that support them. Many of these systems...

Briefs
Photonics/Optics

High-Power Broadband Multispectral Source on a Hybrid Silicon Chip

For applications in manufacturing, remote sensing, medicine, military, and fundamental science, an ideal laser would have high output power and a diffraction-limited beam....

Briefs
Photonics/Optics

Stimulated Brillouin Scattering (SBS) Suppression and Long Delivery Fibers at the Multikilowatt Level with Chirped Seed Lasers

One obstacle in the scaling of high-power fiber lasers arises because of nonlinear effects (e.g., stimulated...

Briefs
Semiconductors & ICs

Shaper Design in CMOS for High Dynamic Range

Front-end electronics for capacitive sensors typically include a preamplifier followed by a filter. The preamplifier provides low-noise amplification of the signals induced in the sensor...

Articles
Defense

Cassini Stays in Touch with NASA's Radio Science Subsystem

After almost 20 years in space, NASA's Cassini spacecraft begins the final chapter of its remarkable story of exploration. From now until September, Cassini will undertake a set of...