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posted in May 2007
Tutorial on 802.11n PHY layer : Part 3
Design How-To  
5/29/2007   1 comment
Part 3: The structures of a MIMO-OFDM transmitter and receiver are analyzed and a data rate table is constructed.
Tutorial: Polar modulation and its variants
Design How-To  
5/24/2007   Post a comment
The announcement this week by Sequoia Communications of a single-chip HEDGE transceiver based on polar modulation calls out for an explanation of what polar modulation is all about and how it varies. Find out more in this special feature compilation.
Tutorial on 802.11n PHY layer: Part 2
Design How-To  
5/21/2007   Post a comment
With 802.11n, wireless achieved data rates equal to wireline. This article discusses the major aspects of the 802.11n PHY layer.
RF Fundamentals: What actually creates the 90 degree coupler phase shift? Part 3
Design How-To  
5/11/2007   Post a comment
M/A COM's Ray Kaarsberg takes the time to provide in depth details of how couplers work in this three-part technical piece. Part 3 covers the derivation of parameters, including S parameters, and conclusions derived from this analysis.
RF Fundamentals: What actually creates the 90 degree coupler phase shift? Part 2
Design How-To  
5/10/2007   2 comments
M/A COM's Ray Kaarsberg takes the time to provide in depth details of how couplers work in this three-part technical piece. Part 2 covers coupling factor, signal propagation delay, maximum coupling, and vector analysis.
RF Fundamentals: What actually creates the 90 degree coupler phase shift? Part 1
Design How-To  
5/9/2007   Post a comment
M/A COM's Ray Kaarsberg takes the time to provide in depth details of how couplers work in this three-part technical piece. Part 1 covers transmission line theory.
High precision op-amps target auto, industrial apps
Product News  
5/2/2007   Post a comment
STMicroelectronics has introduced a high-precision op-amp dubbed the TS507 that features an ultra-low input offset voltage guaranteed over a wide common-mode voltage range, making it suitable for automotive and industrial applications.


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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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