PRODUCTS EDITOR’S CHOICE WIDEBAND RF SYNTHESIZER/PLL
A wideband RF synthesizer/PLL (phase lock loop) has been introduced by Integrated Device Technology, Inc. with low power consumption and good phase noise performance. The company's 8V97051 is also claimed to generate fewer and lower power spurs than similar competing devices. In addition, the company
points out this device offers an integrated voltage-controlled oscillator (VCO) with a large tuning range capable of providing multiband local oscillator (LO) frequency synthesis, limiting the need for multiple narrow-band RF synthesizers/PLLs. It is offered in a compact 5 by 5mm 32-VFQFN package and is pin compatible to similar devices from other manufacturers. The device’s low-power consumption is ideal for high-performance
applications with limited or no air flow, such as RF cards in base stations. The company advises it has a figure of merit of -231dBc/Hz, which enables superior phase noise performance. In addition to offering low phase noise, the 8V97051 provides 16 bits of frequency resolution that makes it ideal for precise RF instrumentation or radar applications. This device can also be used in microwave transceivers and industrial electronic products. The solution can generate frequencies from 34.375MHz to 4.4GHz and consumes 380mW. it can deliver phase noise performance of -143dBc/Hz at 1MHz offset for a 1.1GHz output, and -146.5dBc/Hz at 1MHz offset for a 700MHz output.
Integrated Device Technologise
www.IDT.com
POWER MANAGEMENT CHIPSETS
Texas Instruments has introduced one of the first power management chipsets with intelligent digital control and a unique body-diode sensing feature to optimise secondary-side synchronous rectification in next-generation AC/DC and isolated DC/DC power supplies. The company's UCD3138A digital controller and UCD7138 low-side gate driver are claimed to improve system efficiency and cut synchronous rectification MOSFET voltage stress in half compared to other digital-power solutions. The company advises accurate control of dead time in the synchronous rectifiers helps minimise power losses and reduces the risk of MOSFET failure. This chipset uses body-diode voltage information in fast digital control algorithms to optimise dead- time and compensate for power-stage component variations without calibration or screening during mass production. This is said to help telecom and server end-equipment manufacturers more easily bring to market energy-efficient 80 PLUS Titanium- grade power supplies, which saves energy costs. Key features and benefits include: Intelligent diode voltage
sensing that optimises dead time. By adjusting timing for minimal diode conduction increases efficiency and reliability, while eliminating the signal-to-noise ratio challenges of traditional MOSFET VDS ON sensing devices. The UCD7138’s asymmetrical, rail-to-rail 4-A source and 6-A
sink peak-current drive supports load range of a few-hundred Watts to a KiloWatt where multiple paralleled FETs are used. The solution enables fast, efficient switching: A 3mm by 3mm QFN package reduces board space as well as parasitic inductances when placed alongside the synchronous rectifier MOSFETs. Efficient operation at frequencies up to 2MHz: The hardware
peripherals in the UCD3138A along with 14-ns propagation delays and fast rise/fall times with minimised tolerances in this device enable extremely high frequencies.
Texas Instruments
www.ti.com / ELECTRONICS Enter 3
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