2−GHz~6−GHz 대역에서 재구성 가능한 무선 RF 수신기

Abstract

A CMOS direct-conversion receiver with only one signal path is reconfigurable from 2GHz to 6GHz in the RF band and from 3.6MHz to 54MHz in the channel bandwidth. By employing a voltage feedback in a common-gate low-noise amplifier (LNA), the input matching of the LNA can be reconfigured for each RF band by simply changing the resonant frequency of the load network. The active-RC channel selection filter (CSF) using novel tuning strategy and R-2R ladder minimize the variation of system noise figure while providing a fine frequency tuning resolution. The frequency characteristic of the (CSF) is automatically tuned by a one-shot tuning circuit. The frequency divider using the self-oscillation frequency tuning method can improve the input power sensitivity. Implemented in a 0.18μm RF CMOS technology, the whole receive path shows 4.6~5.6dB noise figure (NF) while consuming 65~75mA from a 1.8V supply depending on the mode of operation.