Microwave Engineering Europe - April 2009 - (Page 34)

34 PRODUCTS OCXO covers 10 MHz to 100 MHz offers true sinewave or squarewave output Greenray Industries has announced the availability of the YH1420 series OCXO (ovenized crystal oscillator), which delivers excellent short-term stability from 10 MHz to 100 MHz and features a compact 20.32 x 12.70 x 9.40 mm (0.80 x 0.50 x 0.37 inch), ROHS-compliant, DIP package. The YH1420 series offers a choice of true sinewave output (Model 1421) or squarewave output (Model 1420) and either +5 or +3.3 VDC supply voltage. The OCXO range WiFi cavity bandpass filter provides high performance in outdoor environments Anatech Electronics has introduced the Model AB2436B479 cavity bandpass ﬁlter designed for suppressing interference to improve the performance of IEEE 802.1a/ b/n access points located in outdoor environments. The eight-cavity bandpass ﬁlter has a center frequency of 2436.5 MHz, -3-dB bandwidth of 70 MHz, typical insertion loss of 0.9 dB at center frequency, typical return loss of 18 dB, and typical harmonic rejection of 90 dB. Selectivity at center frequency ranges from less than 91 MHz at a 20 dB bandwidth to less than 150 MHz at a 60 dB bandwidth. The ﬁlter will handle an RF input power of 50 W, has an meets Stratum 3 requirements, and has been designed to serve as a stable reference source for telecommunications, instrumentation and radio communications applications. www.mwee.com/216200105 DC-DC regulators optimized for noise sensitive RF power amplifiers The AS1332-34 family of step down DC-DC regulators from austriamicrosystems is optimized for noise sensitive RF power ampliﬁers in single cell Li-Ion battery powered applications. The three devices in the AS1332-34 family deliver up to 650 mA from an input voltage range of 2.7 to 5.5 V. The AS1332 DC-DC regulator is optimized for low power RF ampliﬁers where the output power is dynamically scaled by the supply voltage to improve battery life. An external analog reference voltage is applied to the Vcon input, upon which the output voltage follows the reference voltage within a period of 20 µs (multiplied by an internal gain of 2.5), varying the output between 1.3 to 3.16 V. A fast rise and fall time ensures plenty of operational margin. The output of the AS1333 is ﬁxed at 3.09 V whereas the AS1334 comes in 1.2, 1.5, 1.8, 2.5, 3.0 and 3.3 V output versions. The AS1332-34 family is designed for minimal space operating temperature of -40 to +85 degrees Celsius, measures 12.29- x 7.11- x 3.10-cm (4.84x 2.8- x 1.22-inches), and has Type-N female RF connectors. It is mounted in a rugged aluminum enclosure and is sealed to protect it from direct contact with the elements. Further, the standard conﬁguration and speciﬁcations of the AB2436B479 can also be tailored to meet speciﬁc customer requirements. www.mwee.com/216200074 Low phase noise VCO requirements in size-restricted battery-powered applications and is ideal for mobile phones and other portable wireless end equipment. The 2 MHz ﬁxed switching frequency minimizes PCB footprint by allowing the use of tiny, low proﬁle inductors and capacitors. This constant frequency switching, together with internal noise reduction circuitry, results in an output voltage ripple of less than 2 mV peak-to-peak. With 97 percent peak and 94 percent average efﬁciency the buck converter family boosts battery lifetime. Moreover, if no supply is required, for example in mobile phone in-ﬂight mode, the DC-DC regulator offers a shutdown mode requiring only 100 nA current combined with an output disconnect feature. www.mwee.com/216200029 covers the UHF band from 390 to 430 MHz Z-Communications has announced an RoHS compliant VCO (VoltageControlled Oscillator), designated CRO0410A-LF, for the UHF band, that operates over 390 to 430 MHz with a tuning voltage range spanning 0.5 to 4.5 Vdc. The VCO features a typical phase noise of -117 dBc/Hz at 10 KHz offset and a typical tuning sensitivity of 17 MHz/V. The CRO0410A-LF voltage controlled oscillator is designed to deliver a typical output power of -4 dBm at 5 Vdc supply while drawing 36 mA (typical) over the temperature range of -30 to 70 degrees Celsius. This VCO features typical 2nd harmonic suppression of -15 dBc and comes in the company’s industry standard MINI-16 package measuring 1.27- x 1.27- x 0.56-cm (0.5 x 0.5 x 0.22 inches). It is available in tape and reel packaging for production requirements. The device is also ideal for automated surface mount assembly and reflow. The VCO is well suited for base station and portable radio applications that require ultra low phase noise performance. www.mwee.com/215801473 Microwave Engineering Europe ● April 2009 ● www.mwee.com http://www.mwee.com/216200105 http://www.mwee.com/216200074 http://www.mwee.com/215801473 http://www.mwee.com/216200029 http://www.mwee.com

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Microwave Engineering Europe - April 2009 News Contents Comment MMICs/RFICs: MMICs for Broadband Receiver Applications Antennas: Mutual Coupling Reduction in Compact Arrays for Wireless Sensors via a Pre-fractal Defected Ground Structure Repeatable Characterization of Distortion Caused by Nonlinearities in Wideband Communication Systems Products Calendar

Microwave Engineering Europe - April 2009

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