Using ripple injection supply for testing oscillator PSRR
May 1, 2008
By Mike F. Wacker Oscillators provide the timing pulse for measurement instrumentation, military weaponry, telecommunication systems and a vast array of consumer electronics...
The challenges of moving to MIMO systems
Feb 1, 2008
By Mark Elo Today's radio devices use a single-input, single-output (SISO) configuration with one transmitter and one receiver and information sent over a single-channel....
Extracting true PA input impedance for high-power RF signals
Nov 1, 2007
By Zhijian Xie The input impedance of a non-ideal power amplifier (PA) stage is determined using a source-pull measurement in a load-pull system, though this method does not account for inaccuracies caused by the impedance of the measuring equipment. However, a test methodology using multiple measurements and two-port S-parameter values for the source and load tuners can extract the true input impedance of the PA at the probe/device reference plane for RF signal power levels...
Addressing new challenges in high-performance switching
Nov 1, 2007
By John McKillop As it explores recent advances in RF microelectromechanical system (MEMS) switches, the article describes its benefi ts and compares performance of its latest MEMS products with conventional mechanical and electromechanical relays and switches....
RF test system tackles 4 4 MIMO signals
Nov 1, 2007
By Ashok Bindra As WiMAX trials proliferate and semiconductor suppliers unveil new lines of chipsets, test equipment makers are readying solutions for the emerging measurement...
Effectively testing MIMO-enabled wireless devices
Aug 1, 2007
By Graham Celine Multiple input, multiple output (MIMO) technology, the foundation for the next generation of Wi-Fi products, leverages multiple transmit and receive antennas...
Characterizing phase-locked loops with waveform scans
Jun 1, 2007
By Mike Hertz Identifying frequency stability problems within a phase-locked loop design can be greatly simplified when using an automated method. When an oscilloscope detects the period of a waveform cycle, this value can be directly inverted to compute the instantaneous frequency of the specific waveform cycle. ...
MIMO WLAN test methodologies for manufacturing
Jun 1, 2007
By Dick Walvis and Sireesha Mallipeddi Four different methodologies are used for testing MIMO WLAN chipsets and products. Each methodology has its advantages and disadvantages, which are discussed in this article....
Selecting the right signal analyzer
May 1, 2007
By Mark Elo In order to get the most for your investment, a little knowledge of your specific application needs along with some general information about signal analyzer functionality will help you make a well-informed decision when selecting from a broad range of available instruments....
Speeding up manufacturing test of WiMAX equipment
Apr 1, 2007
By Christian Olgaard This article attempts to show that by optimizing the capability of the device under test's driver to generate special non-linked mode signals, in combination with advanced trigger and analysis methods, it can lead to test times that are many times faster than what is currently possible....
Locating SSC errors using modulation profiles
Apr 1, 2007
By Mike Hertz Spread spectrum clocking allows for clocked devices to reduce radiated emissions by frequency-modulating the signal. This controlled modulation distributes the energy of the carrier across a wider frequency range, thereby reducing peak power....
