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Fast Data Converters Advance Wireless Systems Data converters can be thought of as the central cores of wireless-infrastructure systems. Complex signals must be digitized upon reception and converted to analog form for transmission. To meet the needs of present and future-generation wireless-infrastructure systems, analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) must therefore perform at RF rates and with outstanding linearity. The AD9444 ADC and AD9779... — Jack Browne March 2005 [Cover Story] RF RMS Power Detector Measures Two Signals Simultaneously To support the data converters in wireless-infrastructure equipment, Analog Devices has introduced a dual-channel RF root-mean-square (RMS) power detector. This power detector measures transmit and receiver signal levels to 2.7 GHz. Known as the AD8364, the device can measure two complex input signals simultaneously. This integrated circuit is ideal for measuring the power levels of complex signals with constantly varying peak-to-average power levels, as in cdma2000, W-CDMA,... — Jack Browne October 2004 [Design Application] Oversampling UART Reduces RF Noise In recent years, wireless communications have grown to encompass applications like remote control, remote sensing, and wireless local-area networks (WLANs). The data rates of such implementations vary from a few hundred to several million bits per... — Eli Flaxer October 2004 [Product Features] Tool Helps Designers Find Interface Parasitics As nanometer design projects become more commonplace, the side effects of shrinking process geometries also will grow familiar. The emergence of significant interconnect parasitic elements is chief among these effects—especially for 90-nm... — John Blyler September 2004 [Design Application] Quality Devices Deserve Good Sound As audio quality becomes increasingly important in electronic systems, many more designers must become skilled in the "art" of analog and mixed-signal design. Some designers find this trend intimidating. In truth, though, an amplifier is still just... — Julian Hayes July/August 2004 [New Products] USB 1.1 Switch Offers Low Power And Bandwidth Mobile wireless devices are popping up everywhere. Such devices rely on the high-speed broadband connectivity provided by Wi-Fi and cellular networks. In addition, these devices often need to communicate within a wireless personal-area network.... — Staff June 2004 [Design Application] Analog Designs Crave Dynamic Gain Control In the process of creating various products that deal with analog signals, one frequently requested function is automatic gain control. This feature is needed to control the amplitude of a given input signal so that it always remains within some... — Dave Bordui May 2004 [Special Report] Converging Markets Nourish RFIC And RF-Design Growth The wireless space has become virtually overrun with radio-frequency integrated circuits (RFICs). This trend is largely responsible for the shrinking sizes and continued power conservation of today's wireless devices. According to the... — Nancy Konish April 2004 [Cover Story] ADC Takes On Cellular Base Stations Cellular base stations currently present many challenges. They remain complex in design and operation while carrying a significant price tag. Weighing heavily on this cost and complexity are the individual cellular base-station components. Among these... — Cheryl Ajluni March 2004 [Cover Story] DUC Eclipses Competitive Offerings The cellular-infrastructure market continues to face its own set of challenges. Consider, for example, that the single most expensive component on a base station is the multi-carrier power amplifier (MCPA). Depending on the MCPA architecture and... — Cheryl Ajluni March 2004 [Product Features] RFIC Test System Meets Wireless Needs For one of the hottest growth areas in the semiconductor market, look to radio-frequency integrated circuits (RFICs). These ICs are an essential part of any wireless device—be it a cell phone, laptop, or multimedia product. To ensure that they... — John Blyler March 2004 [New Products] Low-Ohmic Switches Deliver Audio Fidelity When dealing with audio applications, it's vital that the signal quality be protected. In space-constrained mobile applications, this obligation becomes even harder to fulfill. To help designers conquer these audio demons, three low-ohmic analog... — Nancy Friedrich February 2004 [New Products] USB-Port Connections Slash Number Of I/Os Wireless-device designers constantly operate under the mantra of "smaller, faster, lighter, and better." The parts that go into a handheld must therefore follow the same path of constant improvement. An example is the NLAS2066 from ON Semiconductor.... — Nancy Friedrich February 2004 [On The Wireless Front] On The Wireless Front Milpitas, California Linear Technology now offers the LTC1407A and LTC1407 analog-to-digital converters (ADCs). These 14-b and 12-b, 3-MSample/s ADCs have two simultaneous sampling inputs. Plus, the... — Cheryl Ajluni February 2004 [Show Coverage] RF Transceiver Makes Zigbee-Product Entrance Interest is steadily building around the new low-data-rate wireless standard known as IEEE 802.15.4. Among this connectivity standard's applications is the creation of a wireless control web for building automation, industrial monitoring-controlling... — John Blyler February 2004 [Show Coverage] DUC And Enhanced FEC Arrive At The FPGA Core As major analysts predicted, FPGAs are continuing to expand into traditional ASIC and DSP markets. To take advantage of this growth, Xilinx is now offering a digital-upconverter (DUC) LogicCore module along with enhanced forward-error-correction... — John Blyler February 2004 [Design Application] CTCSS Unclutters Receiver Sound To allow multiple users to share one carrier frequency, many handheld transceivers employ Continuous Tone Coded Squelch System (CTCSS) encoders and decoders. CTCSS systems add a tone at the low end of what the human ear can hear to a transmitted... — Jeff Dahlin November/December 2003 [Column] Dataconverters Turn To Analog Synthesis Wireless applications increasingly depend upon digital-signal-processing techniques. In a transmitter, for example, they modulate information from a baseband onto an RF signal. In a receiver, they modulate information back to the baseband. This... — Eric Soenen November/December 2003 [Cover Story] Radio-On-A-Chip Unwires Electronics Many of today's engineers and designers hope to make the switch from wired electronics to their wireless counterparts. Factoring in installation, this migration typically provides a great deal of cost savings. But the adoption of wireless technology... — Cheryl Ajluni November/December 2003 [Design Application] Slice And Dice Chunks Of Radio Spectrum The path to real-time wideband channelization is camouflaged by different techniques. Among the competing approaches are Pipelined FFT, polyphase DFTs, multiple digital downconverters (DDCs), and both the Pipelined Frequency Transform (PFT) and its... — John Lillington  prev. page
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