| In recent years,wireless communication related techniques are quite popular, and are,developing in a great pace。As a result,wireless communication has brought wider and greater influence to our lives。During this process,several commonly used protocol concerning wireless communication networks have arisen,such as,IEEE 802.11(Wi-Fi),Bluetooth,UWB and Zigbee。Design covered in this thesis belongs to wireless communication systems of specific protocol.It targets at radio-frequency transceiver system on 2.4GHz ISM band,and,is for short-range,low-data-rate wireless data transmission application. The system features at low-power and low-cost,thus it possesses great value and potential。A low -noise-amplifier and a down-conversion mixer for this transceiver front-end are described in this thesis。This LNA follows the source-inductance degeneration cascode NMOS structure, and,is also differential structure。From implementation aspects,many facts such as gain,linearity,noise and input matching are considered and optimized.As for implementation,some structural changes are made from the classical structure under power constraint。Better overall performance has been reached based on omitting of several large-area devices。The LNA owns quite a high gain in operation frequency range。The Mixer adopts Gilbert-cell double-balanced structure.Source degeneration resistors are used to adjust trade-off between conversion gain and linearity。And PMOS outputs are in serial with small resistors,forming output stage of the special mixer。These strategies have made full use of the voltage headroom to improve linearity and gain。Each mixer achieves conversion gain 6.2dB,and consumes only 3.3mW under 1.8V voltage source。The system contains other modules such as balun,PA,mode/power switch,filter, etc,and it calls for adequate matching and connection.Some discussion about this topic is also contained in the thesis。... |
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