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Báo cáo hóa học: " Using MEMS Capacitive Switches in Tunable RF Amplifiers"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Using MEMS Capacitive Switches in Tunable RF Amplifiers | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 16518 Pages 1-9 DOI 10.1155 WCN 2006 16518 Using MEMS Capacitive Switches in Tunable RF Amplifiers John Danson Calvin Plett and Niall Tait Department of Electronics Carleton University Ottawa ON Canada K1S 5B6 Received 15 October 2005 Revised 27 February 2006 Accepted 14 March 2006 A MEMS capacitive switch suitable for use in tunable RF amplifiers is described. A MEMS switch is designed fabricated and characterized with physical and RF measurements for inclusion in simulations. Using the MEMS switch models a dual-band low-noise amplifier LNA operating at 2.4 GHz and 5.2 GHz and a tunable power amplifier PA at 5.2 GHz are simulated in 0.18 pm CMOS. MEMS switches allow the LNA to operate with 11 dB of isolation between the two bands while maintaining 11.6 dB of gain and sub-4.5 dB noise figure. MEMS switches are used to implement a variable matching network that allows the PA to realize up to 37 PAE improvement at low input powers. Copyright 2006 John Danson et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION The current push towards smaller devices in wireless technologies is driving the development of more highly integrated low-power radios. The desire for interoperability between different networks requires that multiple-standard radios be implemented in a single product. There are obvious advantages to having a product that operates in both bands. However this presents a challenge to designers seeking to reduce chip area. Many radios use separate receive and transmit chains duplicating circuitry for each band of operation. Unfortunately there are few alternatives using traditional circuit techniques. Micro-electrical-mechanical systems MEMS offer the circuit designer new .