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May 2008 Synthesized LO Spans 0.05 To 20.48 GHz Direct-digital synthesis (DDS) is capable of impressive frequency and amplitude switching speeds and, depending upon the bit resolution of the DDS architecture, extremely fine frequency and phase control. DDS technology is the basis for the WaveCor line of high-performance microwave signal sources from ITT Microwave Systems (Lowell, MA), notably the firm’s latest addition, the WaveCor synthesized local oscillator (SLO) model 20.0 frequency ... — Jack Browne May 2008 LDMOS FET Drives UHF TV Transmitters Television broadcast systems in the ultrahigh-frequency (UHF) region from 470 to 860 MHz will make the transition from analog to digital technology next year, and broadcasters are taking advantage of digital performance while attempting to keep equipment costs low. Since one of the highest cost components is the transmitter, it is no surprise that the MRF6VP3450H 50 V LDMOS FET from Freescale Semiconductor (... — Jeannette Wilson May 2008 High-Dynamic-Range Mixer Upconverts 1.5 To 3.8 GHz Active frequency mixers provide the frequency-translation function required in modern communications systems, with the added benefit of conversion gain in contrast to the conversion loss of passive mixers. Model LT5579 from Linear Technology (www.linear.com) is such an active mixer, designed for upconversion applications from 1.5 to 3.8 GHz. It offers enough bandwidth to cover the 1.9-GHz cellular... — Jack Browne May 2008 VCOs Offer Linear Tuning Through 10.9 GHz Linear tuning is essential for a wide range of applications requiring frequency precision over time and temperature. The latest series of voltagetuned oscillators from Synergy Microwave (www.synergymwave.com) provide outstanding tuning linearity at frequencies through 10.9 GHz. The first three models in the DCO and DXO families of voltage-tuned oscillators provide frequency coverage of 4730 to 5420... — Jack Browne May 2008 Custom Synthesizers Range 144 To 4500 MHz Frequency synthesizers provide the fixed and tunable signals for local oscillators (LOs) in a wide range of commercial and military communications systems, including in wireless base stations. Technologies for creating frequency synthesizers are diverse, from traditional analog methods using phase-locked loops (PLLs) to direct digital synthesizers (DDSs) that rely on high-speed digital-to-analog converters (DACs) to transform digital input words into... — Jack Browne December 19, 2007 Microlab/FXR Adds Broadband Coupler Series — Jack Browne December 19, 2007 Software Speeds Design of Large-Scale RFICs — Jack Browne December 2007 2.4- And 5-GHz Pas Form IEEE 802.11n Building Blocks With the growing popularity of Wi-Fi, IEEE 802.11n wireless-localarea- networking (WLAN) capability is being designed into many next-generation products. To simplify this process, two new power amplifiers (PAs) promise to simplify design while reducing the system bill of materials cost by 30 percent compared to current solutions. The SE2537L is a 5-GHz PA while the SE2581L is a 2.4-GHz PA. Systems based on the SE2537L and SE2581L are capable of +20 dBm... — Nancy Friedrich December 2007 Squat OCXOs Deliver 1-ppb Stability Communication systems that are based on precise synchronization, such as Global Positioning System (GPS) infrastructure, demand ultra-stable frequency in small sizes. In hopes of satisfying such applications, an oven-controlled crystal oscillator (OCXO) is promising stability as low as 1.0 ppb at a height of less than 0.5 in. The NV47AG OCXO is available in frequencies from 5 to 13 MHz. It offers very low phase-noise options for both ... — Nancy Friedrich December 2007 MMIC Receiver Covers 4.5 To 10.5 GHz A fully integrated gallium-arsenide (GaAs), monolithic-microwave-integrated- circuit (MMIC) receiver has been spawned for wirelesscommunications applications like millimeter-wave point-to-point radio, local multipoint distribution services (LMDS), satcom, and very small aperture terminal (VSAT). The XR1011-QH covers the 4.5- to-10.5-GHz frequency bands. It flaunts a noise figure of 1.8 dB and 13 dB conversion gain across the band. The receiver integrates an... — Nancy Friedrich December 2007 PA Delivers 50 W Over 1500 To 2500 MHz At just 6.4 X 2.5 X 1.5 in., a Class AB linear amplifier vows to deliver 50 W of output power over the full 1500-to-2500-MHz frequency range. The Model BME158258-50 offers gain of 40 dB ± 1.5 dB. RF input overdrive is +10 dB. The amplifier's input voltage standing wave ratio (VSWR) is 2:1 maximum. Harmonic rejection is -25 dBc while spurious signals are specified at -60 dBc. The Model BME158258-50 operates with supplies of +23 to +32 VDC and 7.5 A current. The power... — Nancy Friedrich November 2007 MIMO Test System Performs Measurements To 6 GHz MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) techniques are rapidly becoming more popular for enhancing radio performance in the presence of noise and interference. To cover both the R&D and production testing of next-generation RF communications equipment and devices, a 4 X 4 MIMO RF test system has been developed. This system comprises the Model 2920 vector signal generator (VSG), Model 2820 vector signal analyzer (VSA), Model 2895 MIMO synchronization ... — Nancy Friedrich November 2007 CATV Amplifiers Target 1-GHz Networks A FAMILY OF GALLIUM-ARSENIDE (GaAs) cable-television (CATV) hybrid amplifiers recently welcomed the addition of two multi-chip modules (MCMs). These modules boast feature bandwidth of 40 to 1000 MHz for high output capacity. The maximum noise figure for both modules is 6.5 dB. With 22.5 dB gain, the MC-7832- HA push-pull amplifier is designed to serve as an input stage for line amplifiers, nodes, splitters, trunk amplifiers, and bridgers in bandwidth- hungry... — Nancy Friedrich November 2007 Multilayer Press Speeds PCB Prototyping IN THE CREATION of custom or prototype printed-circuit boards (PCBs), key factors often include speed, security, and convenience. The MultiPress S microprocessor- controlled, benchtop multilayer lamination press vows to satisfy all of these needs. The press promises a reduced pressing time of less than 90 minutes. The MultiPress S bonds multilayer circuits of all common rigid and flexible substrates. Because it delivers equal pressure on the full press plate area, it... — Nancy Friedrich October 2007 RF Synthesizer Integrates VCOs For Operation To 5 GHz Equipment manufactures have been increasingly demanding space and cost-efficient solutions for radio applications with frequencies in the microwave range. A single-chip RF synthesizer with integrated voltagecontrolled oscillators (VCOs) is planning to fulfill that need with operation up to 5 GHz. Dubbed the STW81103, it has measured phasenoise performance of 0.27 deg. root mean square (RMS) at 1.16 GHz, 0.6 deg. RMS at 2.33 GHz, and 1.5 deg. RMS at 4.67 GHz with a frequency step... — Nancy Friedrich October 2007 Configurable Test Platform Operates To 6 GHz The PXI Studio measurement system encompasses the PXI 3000 Series hardware modules, PXI Studio software with measurement plug-ins, and a PXI instrument chassis. The PXI 3000 Series modules now include the following: the 3025C, a 1-MHz-to-6-GHz digital signal generator; the 3030C, a 250-kHz-to-3-GHz wideband RF digitizer; and the 3035C, a 250-kHz-to-6-GHz wideband RF digitizer. These products extend the frequency-range coverage of the PXI 3000 Series hardware modules to include 250 kHz... — Nancy Friedrich October 2007 Demodulator Flaunts PGA With 24 dB Of Gain Range Compared tosuperheterodyne architectures, a monolithic, high-linearity quadrature demodulator is vowing to reduce the component count of the receive signal chain in third-generation (3G) base stations by at least 75 percent. The TRF3710 demodulator integrates a baseband filter that is software-programmable with 1-dB corner frequency. It can continuously cover signal bandwidths of 615 kHz (single-carrier CDMA2000) to 1.92 MHz (single WCDMA carrier). The device includes a... — Nancy Friedrich October 2007 LNA Modules Promise Noise Down To 1.8 dB Bridging applications ranging from broadband test equipment to aerospace and defense systems, a line of lownoise- amplifier (LNA) modules covers up to 18 GHz in bands. The NEL- 0618T620-5MH broadband LNA, for example, covers 6 to 18 GHz. It delivers at least +20 dBm output power at 1-dB compression, gain of 28 dB ±2 dB or better, and a noise figure of 4 dB. This LNA operates from a single +12- VDC supply. In addition, it draws 490 mA or less and is temperature... — Nancy Friedrich September 2007 Calibrator Kit Pinpoints Cable Loss Every cable has some signal loss. In precision wireless test setups, that loss must be measured and compensated for in order to obtain accurate results. Such is the goal of the True-Cable kit, which measures the loss of cables used in precision wireless test set ups like channel emulation. For a given test setup—once that measurement is performed and the file is saved—that data can be incorporated into an IQfact automated test program for easy program setup. The TrueCable... — Nancy Friedrich September 2007 Switch IC Offers Broadband Operation To 3.8 GHz WiMAX is inspiring new designs across the industry. A 10-W, double-pole, four-throw (DP4T), gallium-arsenide (GaAs), monolithic-microwave-integrated-circuit (MMIC) switch has now been spawned to help designers integrate WiMAX into customer premise equipment (CPE). The UPG2181T5R operates to 3.8 GHz with control voltage of +3.0/0 V. Insertion loss is 0.8 dB at 2.3 to 2.7 GHz and 1.0 dB at 3.3 to 8.0 GHz. The switch reaches 1-dB compression at +40 dBm power. It hits receive 1-dB... — Nancy Friedrich  prev. page
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