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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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