The Opportunities and Challenges of LTE Unlicensed in 5 GHz
David Witkowski, Executive Director, Wireless Communications Initiative
In 1998, the Federal Communications Commission established the Unlicensed National Information Infrastructure or U-NII 5 GHz bands. These are used primarily for Wi-Fi networks in homes, offices, hotels, airports, and other public spaces and also consumer devices. U-NII is also used by wireless Internet Service Providers, linking public safety radio sites, and for monitoring and critical infrastructure such as gas/oil pipelines.

MMD March 2014

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Band Reject Filter Series
Higher frequency band reject (notch) filters are designed to operate over the frequency range of .01 to 28 GHz. These filters are characterized by having the reverse properties of band pass filters and are offered in multiple topologies. Available in compact sizes.
RLC Electronics

SP6T RF Switch
JSW6-33DR+ is a medium power reflective SP6T RF switch, with reflective short on output ports in the off condition. Made using Silicon-on-Insulator process, it has very high IP3, a built-in CMOS driver and negative voltage generator.

Group Delay Equalized Bandpass Filter
Part number 2903 is a group delayed equalized elliptic type bandpass filter that has a typical 1 dB bandwidth of 94 MHz and a typical 60 dB bandwidth of 171 MHz. Insertion loss is <2 dB and group delay variation from 110 to 170 MHz is <3nsec.
KR Electronics

Absorptive Low Pass Filter
Model AF9350 is a UHF, low pass filter that covers the 10 to 500 MHz band and has an average power rating of 400W CW. It incurs a rejection of 45 dB minimum at the 750 to 3000 MHz band, and power rating of 25W CW from 501 to 5000 MHz.

LTE Band 14 Ceramic Duplexer
This high performance LTE ceramic duplexer was designed and built for use in public safety communication and commercial cellular applications. It operates in Band 14 and offers low insertion loss and high isolation to enable clear communications in the LTE network.
Networks International

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June 2013

Optical Modulator Driver Solutions 28 Gbps EML and 32 Gbps MZ Drivers
By Hittite Microwave

Hittite has added three new products to its optical modulator driver family, HMC1068, HMC1069 and HMC7150LP3DE, addressing the stringent lower power and higher density requirements of the next generation long-haul, metro core and metro access fiber optic equipments.

HMC7150LP3DE is an EML (Electro-absorption Modulated Laser ) driver, designed for 100G Ethernet LR4 and ER4 applications. The device supports data-rates up to 28.3 Gbps and its high bandwidth yields output signal characteristics of 12 p-sec rise & fall times.

Hittite Optical Modulator Driver Family: HMC7150LP3DE, HMC1068, HMC1069

HMC7150LP3DE is ideal for CFP2/CFP4 and QSFP2, or similar form factor pluggable modules, with its compact size and low power consumption. HMC7150LP3DE  is available in 3x3 mm plastic LP3 RoHS compliant SMT package. HMC7150LP3DE runs on positive supply, from 3.3V to 6V. The wide supply operating range enables module designers to lower the power consumption of their modules by selecting the optimum supply voltage based on their EML characteristics.
This device has 50 Ohm matched inputs and outputs and must be used in AC-coupled configuration. The optimum bias condition for the device is set with external bias voltages. The output signal cross-point and amplitude are adjustable via  device control pins. Evaluation boards and reference designs are available upon request.

HMC1068 & HMC1069 in Cascade Configuration MZ Modulator Driver Application.

HMC1068 and HMC1069 are optical modulator drivers in die form and they are perfect for driver integrated transmitter optical sub-assembly modules for 100G systems. Both parts support data rates up to 32 Gbps with excellent time domain performance, and the small size, low power consumption ensures the designers meet their power budgets in highly integrated designs. HMC1068 can deliver up to 3 Vp-p output voltage swing without the need for an external bias-tee and they are perfect for Electro-Absorption (EA) type modulators. HMC1069 can deliver higher voltage up to 8 Vp-p output swings and is designed to meet the electrical characteristics of the Mach-Zender (MZ) type optical modulators.

32 Gbps NRZ Output Eye Diagram @ 6V Supply.

HMC1069 is biased through an external bias-tee at its RF output. Both drivers have 14 to 15 dB gain and depending on the application they can be used as single stage or in cascade configuration for higher gain. HMC1068 and HMC1069 support wide supply voltage range, that gives the designers the advantage and the flexibility to optimize and lower the power consumption of their system for different optical modulators. These three parts have 50 Ohm matched inputs/outputs and must be used AC-coupled. The peak-detector feature is incorporated in all devices which can be used for monitoring the output voltage swing level during the normal operation. As fiber-optic systems move into smaller sizes, higher levels of integration of the building blocks is needed. HMC1068 and HMC1069 die products address the next generation optical modulator designs, where the drivers are integrated in the same module assembly with the optical modulator. Samples and application notes are available upon request.

For more information, visit our website.

Hittite Microwave
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Uncertain Times for DefenseWill OpenRFM Shake Up the Microwave Industry?
By Barry Manz

Throughout the history of the RF and microwave industry there has never been a form factor standardizing the electromechanical, software, control plane, and thermal interfaces used by integrated microwave assemblies (IMAs) employed in defense systems. Rather, every system has been built to meet the requirements of a specific system, which may be but probably isn’t compatible with any other system. It’s simply the way the industry has always responded to requests from subcontractors that in turn must meet the physical, electrical, and RF requirements of prime contractors. Read More...

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