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26 Jan 2015

germanium-tin-laser-2

by Colin Jeffrey @ gizmag.com:

Swiss scientists have created the first semiconductor laser consisting solely of elements of main group IV (the carbon group) on the periodic table. Simply, this means that the new device is directly compatible with other elements in that group – such as silicon, carbon, and lead – and so can be directly incorporated in a silicon chip as it is manufactured. This presents new possibilities for transmitting data around computer chips using light, which could result in potential transfer speeds exponentially faster than possible with copper wire and using only a fraction of the energy of today’s integrated circuits.

First germanium-tin semiconductor laser directly compatible with silicon chips - [Link]

26 Jan 2015

DAC-Internal-Block-Diagram

Shawon M. Shahryiar @ embedded-lab.com writes:

In embedded systems, oftentimes it is needed to generate analog outputs from a microcontroller. Examples of such include, generating audio tones, voice, music, smooth continuous waveforms, function generators, voltage reference generators, etc. Traditionally in such cases the most common techniques applied are based on Pulse Width Modulation (PWM), resistor networks and external Digital-to-Analog Converter (DAC) chips like MCP4921. The aforementioned techniques have different individual limitations and moreover require external hardware interfacing, adding complexities and extra cost to projects. XMega micros are equipped with 12 bit fast DACs apart from PWM blocks and again it proves itself to be a very versatile family of microcontrollers. In this post we will have a look into this block.

XMega DAC - [Link]

26 Jan 2015

ISL8203M

by elektor.com:

Intersil have introduced a single chip just 9 x 6.5 mm which contains just about all the control features (including the output stages) needed to build a dual 0.8 to 5 V power supply with 3 A per channel output capability. The ISL8203M can also supply 6 A in current sharing operation.

The ISL8203M is an integrated step-down power module optimized for generating low output voltages down to 0.8V. The input supply voltage range spans from 2.85 V to 6 V. The two channels are clocked 180° out-of-phase to help reduce input RMS current and EMI. While in current sharing mode this interleaving of the two channels is beneficial for reducing input and output voltage ripple.

Dual 3A PSU on a Chip - [Link]

26 Jan 2015

an_nxp_an11119

App note(PDF) from NXP on DC-DC medium power small-signal MOSFETs.

This application note explores different methods of DC-to-DC conversion. It includes some examples of DC-to-DC down-converters using small-signal MOSFETs.

App note: Medium power small-signal MOSFETs in DC-to-DC conversion - [Link]


26 Jan 2015

by SparkFun Electronics @ youtube.com:

In today’s episode of “According to Pete,” SparkFun Director of Engineering Pete Dokter is taking a look at homelighting solutions and the SparkFun FemtoBuck LED Driver

SparkFun According to Pete #40: LED Home Lighting and the FemtoBuck Driver - [Link]

26 Jan 2015

by mjlorton @ youtube.com

In this video I explain how a spectrum analyser (Tektronix MDO3000) can be used to view signals in the frequency domain vs an oscilloscope’s time domain.
I give an overview of the logarithmic scale and its benefits vs a linear scale.
I explain how compound wave forms like square and triangle are made up of harmonics.
I do a practical demonstration of how the spectrum analyser works with some example signals. I then show how this can also be done on an oscilloscope using the FFT (fast Fourier transform) maths function.

Spectrum Analyzer, Scope and FFT looking at Signals - [Link]

26 Jan 2015

IMG_3660-1024x768

by paulbleisch.com:

My son got one of these Leap Frog toys a few years ago as a gift. He enjoys playing with it very much. I am not sure how much counting and learning he is doing but it makes funny noises and sings to him so its a lot of fun.

Recently the unthinkable happened. It died. Not the batteries but something else. I took the back off to look at what might be wrong (which was very easy for a toy). Unfortunately, other than the speaker, a switch, battery compartment, and a ribbon cable to the front, there wasn’t much to investigate. A couple of glop tops and nothing else. I fiddled a bit more with it but everything “external” seemed fine.

Make a Custom Membrane Keypad for Arduino - [Link]

23 Jan 2015

4-scientistsdiby Curt Richter @ phys.org:

Two-dimensional (2D) materials such as molybdenum-disulfide (MoS2) are attracting much attention for future electronic and photonic applications ranging from high-performance computing to flexible and pervasive sensors and optoelectronics. But in order for their promise to be realized, scientists need to understand how the performance of devices made with 2D materials is affected by different kinds of metal electrical contacts.

Researchers in PML’s Semiconductor & Dimensional Metrology Division, in collaboration with researchers from George Mason University, compared silver and titanium contacts on MoS2 transistors to determine the influence of the metal–MoS2 interface.

Scientists discover a better metal contact that improves two-dimensional transistor performance - [Link]

23 Jan 2015

vandate-borate-glass

by David Nield @ gizmag.com:

The batteries inside our smartphones and laptops are fighting a losing battle when it comes to keeping these devices juiced up, but researchers from ETH Zurich have discovered a new type of glass material that could make a major difference: vanadate-borate glass. The glass can be used as an electrode material in lithium-ion batteries to almost double the amount of time they last between charges.

A new type of glass could double your smartphone’s battery life - [Link]

23 Jan 2015

Intersil ISL8203M

Susan Nordyk @ edn.com:

Encapsulated in a tiny 9.0×6.5×1.83-mm QFN package, the ISL8203M step-down DC/DC power module from Intersil furnishes an adjustable output voltage between 0.8 V to 5 V to allow designers to use one device to build a single 6-A or dual 3-A output power supply. The ISL8203M simplifies power-supply design for FPGAs, ASICs, microprocessors, DSPs, and other point-of-load conversions in communications, test and measurement, and industrial systems.

Intersil shrinks step-down DC/DC power module - [Link]



 
 
 

 

 

 

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