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May 2009 [Communications] Translinear Circuits Tackle RF Signals Translinear circuits were originally developed for nonlinear analog signal processing, as circuits with inputs and outputs in the form of currents.1 Another simplified interpretation of a translinear circuit stems from the fact that the transconductance of a bipolar transistor is linearly proportional to its collector current. Essentially, a translinear circuit works in the current domain rather than the voltage domain, requiring a... March 2009 [Communications] Analyze Requirements For WEDGE Receivers Third-generation (3G) cellular networks offer unprecedented functionality and services for consumers, but also a host of challenges for handset designers. To provide the many services available, a mobile handset must work seamlessly across multiple wireless networks, such as wideband codedivision- multiple-access (WCDMA) and GSM/EDGE systems. Ideally, for reduced design cycle time and lower bill-of-material (BOM) costs, a practical transceiver... November 2007 [Devices & ICs] Developing Designs For CMOS Power Amplifiers Widespread adoption of wireless technology has created market demands for highly integrated circuits, such as a transmitter, receiver, and frequency synthesizer on a single chip. Silicon CMOS technology has made such integration possible with the exception of the power amplifier (PA), which is still typically implemented in non-CMOS technologies. Ideally, silicon CMOS PAs can be developed for tight integration with other wireless building blocks.... September 2007 [Components] Enhance CMOS Charge Pumps And Phase-Frequency Detectors Frequency synthesizers orchestrate the frequency translation in modern wireless transceivers. The performance of the synthesizer, notably its phase jitter and spurious levels, can greatly determine the performance of the overall wireless system. Many factors impact phase jitter and spurious, including the choice of synthesizer architecture—integer-N or fractional-N phase-locked loop (PLL)—and the number of loops and comparison frequency. Synthesizers... June 2005 [Components] Slot Boosts Bandwidth Of WLAN Patch Antenna Wireless local-area networks (WLANs) at 5 GHz offer the impressive data rates (54 Mb/s) that have helped them grow in popularity. The broad bandwidth of these systems—from 5.15 to 5.85 GHz—also poses a challenge for RF circuit and antenna designers. Fortunately, it is possible to cover the full 5-GHz band using a compact patch antenna. Traditionally, patch antennas are limited in bandwidth, typically less than 5 percent. But numerous approaches have been developed to... |
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