Microwave Engineering Europe - October 2008 - (Page 49)

PRODUCTS 49 Half brick DC/DC converters bring high-efficiency to RF PAs enable the supply voltage to be optimised for each individual application percent, leading to a 60 percent reduction in power dissipation. This dramatically reduces the heat generated in the system and associated cooling mechanisms, while improving overall system reliability. Calculated MTBF figures according to MIL-HDBK 217F are 1.8 million hours. All devices are capable of withstanding transients of 50 V for 100 ms, and have a basic isolation level from input to output of 2250 Vdc. Control and protection features include input under-voltage lockout, output over voltage protection, current limit, short circuit protection and thermal shutdown. Full operating temperature range of the device is -40 to +100 °C, and it is fully RoHS 6/6 compliant. Applications include wireless technology platforms such as GSM, 3G, WiMAX and TD-SCDMA. Other targeted markets include electronic countermeasure applications such as RF jammers to counter Remote Controlled Improvised Explosive Devices (RCIED’s), military communication equipment, and homeland security applications. LDMOS, GaAs and GaN power transistors typically need a supply voltage centered on either 28 V or 50 V, but importantly the supply voltage needs to be optimised for each individual application. The 28-V IQ24280HxC devices therefore offer an output trim range of -50 percent to +20 percent, while the 50-V IQ24500HxC devices offer a trim range -50 percent to +10 percent, thereby covering a multitude of different requirements. www.mwee.com/210602931 SynQor has released several DC/DC converters in its InQor product line that target RF power amplifier applications, delivering power densities of up to 164 W per cubic inch and efficiencies of up to 95 percent. The IQ24280HEC14 and IQ24280HZC18 offer a nominal 28 V output at 400 W and 500 W respectively, while the IQ24500HEC08 and IQ24500HZC10 offer a nominal 50 V output at the same power levels. All devices use the industry standard Half Brick pin-out, and are completely encapsulated for harsh environments requiring protection to the Pollution Degree 3 limits of EN/UL60950-1. The converters offer the system designer board area reductions of up to 42 percent over competitive Full Brick solutions and the efficiency improvements over those devices are more than 7 LC Miniature Filters Small package. High volume. Right price. Large-scale production capabilities and custom design solutions that work for you – today and tomorrow. Ultra-thin MEMS oscillator measures 3.5 by 3 mm with a mere 0.25-mm thickness Touted as the world’s thinnest MEMS oscillator at just 0.25 millimeters, the SiT8002XT targets applications such as smart cards, ultra-thin cellphones, systemin-package modules, ﬂash storage units and other multichip modules. SiTime said it unstacked two dies in its previous SiTime8002 MEMS oscillator, slimming it to one-third its previous thickness but increasing its surface area. The SiT8002 used die stacking to combine the mechanical MEMS die and its ASIC, but the SiT8002XT puts the two die side-by-side. The new chip measures 3.5 by 3 mm, but is only 0.25-mm thick compared to 0.85 mm previously. Deepreactive ion etching is used to create deep, high-aspect ratio silicon structures for the vibrating element of the MEMS oscillator. The oscillator comes ip n a four-pad XLLGA package and can be factory programmed in less than 48 hours at frequencies between 1 and 125 MHz, voltages between 1.8 and 3.3 V and either 100 or 500 parts per million frequency tolerance www.mwee.com/210603827 To find out more, call (800) 344-2412 or visit www.trilithic.com. RF32608 Microwave Engineering ● October 2008 ● www.mwee.com 049_MWEE.indd Sec1:49 2/10/08 12:44:12 http://www.mwee.com/210602931 http://www.trilithic.com http://www.trilithic.com http://www.mwee.com/210603827 http://www.mwee.com

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Microwave Engineering Europe - October 2008 Contents Comment News Cover Feature: AWR's AXIEM Software Brings 3D Planar Electromagnetic (EM) Simulation "Up Front" RFID: Augmented Reality: Beyond RFID and QR Codes for Mobile Phone Platforms Filters & Frequency Synthesis ZigBee Goes Green with Support for Smart Energy Simplify Mobile Data Applications and Services Test Enabling the State-of-the-Art in Automatic Test Equipment National Physical Laboratory Test Facility Aids Development of Next-Generation Antennas Selecting the Synthetic Test Environment for Transmit-Receive (T-R) Modules in a Phased Array Radar System Products Calendar

Microwave Engineering Europe - October 2008

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