An Inductorless Differential LNA with Active and Passive Enhancement for Cognitive Radio

Cognitive radios are expected to opportunisticly communicate with covering a wide range of the frequency spectrum by continously sensing the spectrum and identifying available channels. In this paper, we introduced an inductorless and differential wideband LNA, which uses the complementary current-reuse structure and active and passive - enhancement technique, which leads to increase voltage gain, reduction in power consumption and noise, in the signal receiving path. Therefore, the proposed LNA is able to achieve 50 MHz – 1.7 GHz bandwidth with  less than -14.26 dB, maximum voltage gain of 20.2 dB, minimum NF of 3.31 dB, while consuming only 1.82 mA from a supply voltage of 1.8 V to TSMC 0.18 µm CMOS technology. Also, simulations are performed using Spectre RF simulator.