| Summary: | 碩士 === 崑山科技大學 === 電子工程研究所 === 93 === The multi-mode receiver system has been widely used in the wireless communication field. Therefore, the development of dual-band devices is especially important. The wireless products with the smaller size, lower power consumption, lower cost and high integration are the major stream of the current market. Hence, it has become an inevitable trend to use the CMOS technologies to implement the RF transceivers.
In this thesis, we have studied the techniques of design and implementation of the dual- band LNAs which are applied to the WLAN systems. The dual-band LNAs enable concurrent support for 2.4GHz (IEEE802.11b) and 5GHz (IEEE802.11a) WLAN systems. We have successfully designed three different structures of dual-band LNA in this thesis. They are one low voltage dual-band LNA, one variable gain dual-band LNA and one folded cascode dual-band LNA, respectively. The supply voltage for the low voltage dual-band and folded cascode dual-band LNAs can be reduced, and is as long as half that for the traditional cascade LNA. On receiving a higher-power signal, the low gain mode of the variable gain dual-band LNA can be enabled to obtain the better linearity.
The studied circuits have been designed under the TSMC 0.18um CMOS processes. These Chips have also been fabricated by the support of CIC in Taiwan.
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