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 Microwave/millimeter-wave components Mar 1, 2006 12:00 PM
For the PDF version of this article, click here. MMIC VCOs
Hittite Microwave Corporation has extended its line of GaAs HBT MMIC VCOs with fundamental, half- and quarter-frequency outputs. These SMT-packaged VCOs are ideal for microwave applications from 11.5 GHz to 14.9 GHz. The HMC515-LP5E, HMC529LP5E, and HMC531LP5E GaAs HBT MMIC VCOs are housed in RoHS-compliant, 5 mm × 5 mm leadless SMT packages with a common pinout. These VCOs integrate resonators, negative resistance devices and varactor diodes. The HMC515LP5E, HMC529LP5E and HMC531LP5E MMIC VCOs tune from 11.5 GHz to 12.5 GHz, 12.4 GHz to 13.4 GHz, and 13.6 GHz to 14.9 GHz, respectively. Output power and phase noise performance are excellent over temperature, shock, and process due to the oscillator's monolithic structure. If the prescaler function is not required, it can be disabled to conserve current. This family of fully integrated VCOs requires no external components, provides output power of +7 dBm to +10 dBm, and delivers very low SSB phase noise of -110 dBc/Hz at 100 kHz offset. Samples and evaluation PC boards for all SMT packaged products are available. Released data sheets are available on Hittite's web site. Fixed attenuator
Mini-Circuits' 50 Ω, 40 dB, 100 W fixed attenuators are suitable for testing high-power components used in communication systems. These attenuators are ideal when testing high-power amplifiers while using low-power test equipment. With 40 dB attenuation, they can also be used as a termination for high-power amplifiers. The BW-40N100W attenuators operating from dc to 4 GHz are priced at $249.95 each, in quantities under 10 units. UMTS SAW filters
With a footprint of only 1.4 mm × 1.1 mm, the RX filters of types B9408 and B9411 for UMTS handsets mark another milestone in miniaturization by EPCOS. Versions with impedances of 100 Ω and 200 Ω are available to match the chipset used. Typical insertion loss in the passband (2.11 GHz to 2.17 GHz) is 1.6 dB. Error vector magnitude, a critical parameter in UMTS systems, is less than 2%. Attenuation in the TX path (1.92 GHz to 1.98 GHz) is 48 dB. Attenuation is at least 31 dB in the range from 2.5 GHz to 6.0 GHz. Samples of the new filters are available. SMD inductor/transformer
The DR359 series surface-mount inductor/transformer from Datatronics features a unique dual coil design in a compact, low-profile package that makes it ideal for a wide range of applications in mini and handheld electronic devices. With a low seated profile standing only 0.315 in. (8 mm) above the circuit board in a square package, the inductor/transformer is a versatile magnetic component featuring both parallel and series functionality. The DR359's dual coil design allows circuit designers to takeadvantage of its ability to support circuit requirements for either an inductor or transformer. The inductor/transformer features an inductance range from 0.47 µH to 1000 µH. The parallel windings feature an inductance range from 0.419 µH to 1005.0 µH (±20%), with a DCR from 0.00195 Ω to 1.6600 Ω. The series windings inductance ranges from 1.676 µH to 4020 µH (+25%), with a DCR from 0.0078Ω to 6.640 Ω. Custom-designed transformers can be specified to meet unique circuit requirements. The DR359 combines high-performance and superior reliability based on its precision coil-winding technology and its advanced high-temperature materials packaging. All materials meet UL94V-0 specifications for operating in harsh conditions. The inductor/transformer measures 0.493 inches (12.5 mm) square. With its flat-top surface, it is ideal for high-speed automated pick-and-place circuit board assembly equipment and is available in a choice of tube or tape-and-reel packaging. It is priced from $0.25 each in typical production volume. Volume OEM pricing is available upon request. Voltage-controlled SAW oscillator
A voltage-controlled SAW oscillator (VCSO) from Crystek Crystals Corporation operates at 1 GHz. Crystek designed the module using FR5 PCB and SAW crystal technology to provide a low noise, low jitter VCSO with true sine wave output. The resulting oscillator features -135 dBc/Hz phase noise at 10 kHz offset. The CVCSO-914-1000 comes in a 9 mm × 14 mm SMT package. It uses a +5 V supply and generates a true sine wave with +7 dBm minimum output power and ±50 ppm minimum absolute pull range (APR). The VCSO has no subharmonics; second harmonic is -20 dBc typical. The oscillator operates from -20 °C to +70 °C. Applications include PLL frequency translation. Price is $125.00 in small volumes. Coaxial resonator VCO
Z-Communications' coaxial resonator-based VCO, the CRO1959A-LF, has a frequency range of 1932 MHz to 1987 MHz. It is designed to meet the high data rate applications of point-to-multipoint and terrestrial radios as carrier generators. This module offers a phase noise performance of -113 dBc/Hz at 10 kHz away from the carrier. CRO1959A-LF has good tuning linearity over the tuning range and provides superior harmonic suppression. This particular CRO model comes in an industry-standard MINI package measuring 0.50 inches × 0.50 inches × 0.22 inches. This VCO is ideal for automated surface- mount assembly and reflow; it is available in tape and reel packaging for production requirements. Pricing starts at $29.95. Silicon oscillators
Maxim Integrated Products has introduced the MAX7387-MAX7391 family of silicon oscillators that offers the supervisory functions of medium-accuracy silicon oscillators in a single, surface-mount microMAX package. These tiny devices switch frequencies and range from 32 kHz for low-power modes, to 16 MHz in high-speed mode. The oscillators are ideal for high-reliability systems because they do not use external high-impedance nodes found in ceramic resonator circuits. This makes them less susceptible to dirt, humidity and high-EMI/ESD conditions. Also, because the oscillators do not rely on mechanical methods, they are less sensitive to environmental concerns. Integrated into this oscillator family is a reset output to interface with a microcontroller, power-fail detection to alert the system of an impending power failure, and a watchdog to monitor the health of the system. Total accuracy for the family is ±4% over -40 °C to +125 °C, and ±2.75% over 0 °C to +85 °C. At a supply voltage of 3.3 V, the supply current is just 2.9 mA for the 16 MHz device. Prices start at $0.65 for 10000-unit quantities. SPDT switch
M/A-COM's RoHS-compliant SPDT switch is designed for applications that require ultrafast settling time, high linearity, low insertion loss, high isolation, and small size at a low price point. The fast settling time of the switch allows time-sensitive systems to respond faster without a reduction in RF performance. Test and measurement applications that require a quick response time can use the MASWSS0192 with its nominal settled on resistance of 2.5 Ω with less than a 0.15 Ω change after only 15 µs. Other performance specifications for this SPDT are its high power handling with P1dB of 28.5 dBm, low typical insertion loss of 0.18 dB, and high isolation of 24 dB. The device is fabricated on a low-cost 0.5 µm gate-length GaAs pHEMT process and features full passivation for increased reliability. Its SC-70 (SOT-363) packaging is lead-free. Each MASWSS0192 is 100% RF tested, as well as dc tested for gate lag to ensure performance compliance. The MASWSS0192 is available and is priced at $0.70 in quantities of 10,000. Microwave coaxial cable
Atlantic Microwave Ltd. has introduced a series of semi-flexible and semi-rigid cables. Including all the popular outside diameters of 0.034 inches, 0.047 inches, 0.086 inches, 0.141 inches and 0.250 inches, the collection includes outer conductor materials of copper, aluminum and braided copper/tin composite, each with its own respective properties of flexibility and bend repetition. Common to all standard types is the characteristic impedance of 50 Ω, PTFE dielectric material and an operating temperature range of -55 °C +125 °C. The aluminum outer cables are tin plated as standard to optimize soldering, while copper types come in a choice of plain or tin-plated. The series is available in lengths up to 50 feet. Beyond the standard range are a number of options with alternative impedances, FEP jackets, silver-plated inner and outer conductors and low loss variants. As examples of electrical performance, a 0.141 inch, O/D copper or aluminum semi-rigid will handle in excess of 170 W at 5 GHz with 91 dB per 100 m attenuation and a top frequency limit beyond 20 GHz. For pricing and availability, contact Atlantic Microwave. SMD inductors
Tabtronics has added to its line of fixed chip inductors for high reliability surface-mount applications. The parts are in compliance with MIL-PRF-83446. They are also space agency qualified (ESA 3201/008). The parts also have excellent Q values, even at high frequencies, and very high self-resonant frequencies. Operating in a frequency range of 200 kHz to 1 GHz, the parts are available with or without tab terminations. The parts weigh 0.07 g, and RoHS versions are available on request. Pricing in 1000-piece lots is as low as $7.00 per unit. Phase locked oscillator
JWM Engineering Group has expanded its microwave phase locked oscillator line with a 902 MHz to 910 MHz version. Model 902 PLL joins the JWM model 1152 and model 5112 PLL units designed to replace crystal local oscillator chains in microwave receivers and transmitters. Using an external reference oscillator, model 902 can provide one part in 10 million frequency stability with a temperature-compensated oscillator, or one part in one billion when using an oven-controlled crystal oscillator. A rubidium oscillator can provide a stability of one part in 100 billion. Users must supply an appropriate 10 MHz reference source for their application. The 902 PLL can be used as a local oscillator in microwave receivers, transmitters, transverters and signal generators. The PLL supports 144 MHz, 50 MHz, 28 MHz and 14 MHz intermediate frequencies. Reverse voltage protection is a standard feature. A three-section low-pass filter with a -3 dB cutoff frequency at 1.2 GHz suppresses second- and third-order harmonic frequencies at the RF output port. A cast aluminum RF-tight enclosure provides the best possible suppression of stray RF leakage. The model 902 cost is $249.95 each.
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