A Compact Low Power Current-Mode Lna-Mixer For Rf Receiver

A compact low-power current-mode LNA-Mixer with current-reuse architecture used for RF receiving applications is presented. The current-mode mixer reuses the current of the LNA directly to get further minimization on power consumption, complexity and area, making the LNA and the mixer acting as a single circuit. The NF of the LNA is improved by using a capacitive cross-couple structure cooperating with noise suppression inductors. And the single-ended voltage signal is converted to differential current signal so as to improve the common-mode noise rejection ratio. Different from voltage-mode passive mixer, the higher gain compensation and low noise are obtained by switching current mirror method combined with source degradation noise suppression technology. The proposed LNA-Mixer implemented in 0.18 mu m CMOS process can obtain a NF of 3.1 dB, a IP1-dB of -31.6 dBm, a small core size of 0.39 mm(2) and a power consumption of 8 mW.