A band selection/switching technique for multi-mode wireless front-end transceivers

This paper describes a frequency-band selection/switching technique and its application to multi-mode wireless transceiver circuits. The technique utilizes voltage-controlled variable inductors and resistors for, respectively, changing input/output impedance and load of the transceiver's key-circuits in accordance with the mode's frequency. Preliminary results for several 0.18 /spl mu/m-BiCMOS building block circuits including RF amplifiers and up/down mixers show feasibility of the approach proposed in multi-mode transceiver systems.

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