A switch-controlled multimode narrowband receiver RF front-end

This work illustrates a flexible and convenient method to build a multimode narrowband receiver RF front-end by means of controlled switches, switched capacitors, and switched inductors. The front-end comprises a dual-gain-mode narrowband low-noise amplifier (LNA) and a dual-linearity-mode mixer. A four-mode receiver RF front-end constructed with the dual-gain-mode LNA and the dual-linearity-mode mixer operating in frequency band range from 1800 to 2050 MHz was demonstrated with an IBM 90-nm CMOS process. The front-end achieves a 1/1.6 dB noise figure, 30/20 dB power gain, and 16/-10 dBm third-order input intercept point while draws a 5.9/3.6 mA current from a 1.8-V supply voltage at the low noise mode and high linearity mode, respectively. The proposed technique can be employed to build an intelligent mobile system.