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White Papers

Synchronous Ethernet Timing Solutions

January 17, 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 17, 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).

802.11ac Technology Introduction

January 17, 2012
802.11ac provides mechanisms to increase throughput and user experience of existing WLAN and will build on 802.11n-2009.

High Repeatability Voltage Variable Attenuator

January 17, 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.

Testing True Mobile Device Performance with Advanced Over-the-Air Testing

January 17, 2012
by Charles Wright, Chief Scientist at Azimuth Systems

Characteristics of E-pHEMT vs. HBTs for PA Applications

January 17, 2012
Avaago White paper for Feb 2011

Keeping Solder in Place With Laser Ablation

January 17, 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 17, 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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