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White Papers

Synchronous Ethernet Timing Solutions

January 12, 2012
Valpey Fisher has developed a series of products for Sync-E applications that specifically address both Jitter Transfer and Jitter Generation issues. VF products use a “crystal based” internal reference clock and an extremely narrow loop filter to produce the best performance solutions available in the industry today.

Voice and SMS in LTE

January 12, 2012
This white paper summarizes the technology options for supporting voice and short message service (SMS) in LTE, including circuit switched fallback (CSFB), SMS over SGs, and voice over LTE (VoLTE).

Channel Sounding in White Space Spectrum

January 12, 2012
The aim of channel sounding is to characterize a radio channel by decomposing the radio propagation path into its individual multipath components. This application note provided by Neul describes how channel sounding can be performed using the R&S SMBV100A Vector Signal Generator and the R&S FSL Spectrum Analyzer. To illustrate the procedure reference is made to 8 MHz wide white space channels in the UK.

High Repeatability Voltage Variable Attenuator

January 12, 2012
A common function present in most RF and Microwave systems is the electronically controlled variable attenuator. At Valpey Fisher Corporation, improvements to two key areas of the MCM approach have been made resulting in lower attenuation error.

Considerations When Specifying Frequency Control Modules and

January 12, 2012
Today, we have continually increasing needs to move, recover, and decode data in smaller bandwidths and shorter time slots with reduced errors. We also want to detect higher resolution information in a physical world of increasing electrical interference.

A Jitter Attenuator For Synchronous Ethernet Applications

January 12, 2012
While Synchronous Optical Networks (SONET) have been widely adopted for use in long-haul applications, Ethernet is preferred in edge routers and access points due to its lower cost.

802.11ac Technology Introduction

January 12, 2012
802.11ac provides mechanisms to increase throughput and user experience of existing WLAN and will build on 802.11n-2009.

Characteristics of E-pHEMT vs. HBTs for PA Applications

January 12, 2012
Avaago White paper for Feb 2011

Keeping Solder in Place With Laser Ablation

January 12, 2012
To prevent unwanted flow, many PCB designers will install dams formed of glass or other dielectric materials to keep solder from shorting active areas on a circuit. But there is another solder damming technique being rapidly adopted—laser ablation. Considered to be more accurate and consistent than traditional solder damming methods.

WLAN 802.11n: From SISO to MIMO

January 12, 2012
This application note discusses WLAN standard IEEE 802.11n. It first describes the most important amendments to previous releases and the ambitious new measurement tasks. Then, it describes how to deal with these tasks using Rohde & Schwarz instruments.

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