Newsletter | February 28, 2014

02.28.14 -- February's Most Popular Articles & News

RF Globalnet
 
From The Editor
What Can Micro-Windmills Teach Us About The Future Of Medical Device Design?
By Jim Pomager   By Jim Pomager
At some point in the not-so-distant future, you’ll be able to recharge your smartphone by waving it about in the air for a few moments or (less conspicuously) by simply holding it out in a stiff breeze.What does this have to do with medical device design, you ask? Quite a lot, as it turns out.
Most Popular Articles
Magnetron Theory 101
A magnetron is a high-power microwave oscillator in which the potential energy of an electron cloud near the cathode is converted into RF energy in a series of cavity resonators. As depicted by the low frequency analog, the rear wall of the structure may be considered the inductive portion, and the vane tip region the capacitor portion of the equivalent resonant circuit. The resonant frequency of a microwave cavity is thereby determined by the physical dimension of the resonator together with the reactive effect of any perturbations to the inductive or capacitive portion of the equivalent circuit.
True Differential Measurements: Characterization Of Balanced Devices
Differential devices offer advantages like noise immunity, low crosstalk, high integration density, and reduced power consumption. However, they also require special measurement capabilities. There are essentially two different measurement methods available: virtual measurements and true differential measurements. This white paper provides an overview of both the virtual and true differential measurement methods.
Rethinking The Role Of pHEMT Cascode Amplifiers In RF Design
The latest mainstream pHEMT cascodes are fabricated in 0.25 micron pHEMT, where the 0.25 micron dimension refers to the gate width of the internal pHEMT transistors. These devices replace the previous generation 0.50 micron pHEMT cascodes, with the smaller gate width devices exhibiting higher gain and NF values that are roughly 0.25 dB lower than their predecessors at a given frequency. What follows is a brief discussion about some of the outstanding properties of these pHEMT cascode amplifiers, some potential applications that go beyond their traditional role as LNAs, and some comparisons with more traditional solutions for those applications.
Most Popular News
Newly Engineered Compact Antennas Inspired By Origami
Using Smartphones To Locate Avalanche Victims
Graphene RF Circuit Ready For Wireless Communications
Ultra-Thin, Transparent Components To Improve Smart Medical Devices
Raytheon Establishes New Electronic Warfare Mission Area