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Highly Integrated IF ASICs for CDMA Cellular/PCS Telephones RF Micro Devices Greensboro, NC The first generation of cellular and personal communications service (PCS) telephones based on code-division multiple access (CDMA) relied on limited integration of RF and IF functions. ICs were designed to handle automatic gain control (AGC) amplification,...

RF Wideband Silicon MMICs Philips Semiconductors Sunnyvale, CA The recently developed Double Poly process for manufacturing wideband silicon RF transistors and MMICs has been enhanced to include inductance loops, capacitors and resistors on chip. The result is a new family of MMICs that help reduce costs and design time...

GPS in 10 Years What will the Global Positioning System (GPS) look like in 10 years? This article discusses improvements to the overall GPS planned over the next decade and examines their impact on system performance for several applications. The Presidential Decision Directive (PDD) released in March 1996 states...

Transistor Technologies for RFICs in Wireless Applications This article presents a multidimensional technical analysis of RF transistor technologies for RFIC applications in cellular and personal communications service (PCS) markets. The first dimension describes the circuit design of each function block in the transmitter and receiver. The second dimension covers...

COMPONENTS Coaxial Attenuators The 50SP series coaxial attenuators provide rugged dependability over the cellular/personal communications service (PCS) frequency range of 800 to 2000 MHz. Units are available within the 0 to 20 dB attenuation range with +/-1.5 dB accuracy from 1000 to 2000 MHz. Maximum SWR is 1.2 below...

SOFTWARE Large-signal Modeling Software LASIMO™ version 2.0 software facilitates the development of accurate large-signal models by simplifying procedures for the extraction of MESFET and high electron mobility transistor large-signal models using a PC. The capabilities of LASIMO have been extended to allow new models to be incorporated and edited...

PROCESSING EQUIPMENT Circuit Board Plotter The ProtoMat 91s/VS series circuit board plotter allows rapid prototyping of RF and microwave circuit boards directly in the laboratory. High speed spindles with adjustable speeds of up to 60,000 rpm ensure high quality milled tracks with a smoothness of 5 mm (max). Both...

MATERIALS Thermal Adhesive Ablebond" 8177 adhesive is designed for applications requiring better dispensability and thermal conductivity. The adhesive provides high thermal conductivity (3 W/mK), and the rheological properties allow the epoxy to flow easily under components, making it suitable for applications such as bonding heat sinks or other heat...

SYSTEMS Wireless Remote DAQ and Control System The Skyline series wireless remote DAQ system comprises a base station and remote radio platforms with attached digital and/or analog input/output modules. The system is fully synthesized and available in both UHF and VHF versions. The simplest remote terminal unit consists of...

ANTENNAS Portable Antennas These FLEXTRON portable antennas are designed for specialized or standard cellular, PCS and ISM-band applications. The company has available 5/8-, 1/2- and 1/4-wave designs in rugged injection-molded, neoprene or the economical polyvinyl-chloride-coated shrink sleeve. Telescoping and articulating coil and whip designs are also available for device...