Abstract
In this paper, an input inductive network for the wideband LNA is proposed. The two input inductors located in and out of the feedback loop are set respectively to combine with the conventional resistive feedback structure. Input matching and NF of the LNA can be optimized separately by varying the value of the two input inductors without significant influence from one to the other. The proposed cascode LNA was analyzed, designed, and fabricated in the IBM 0.13μm CMOS technology to verify the concept. A −10dB S11 is achieved in a wide range of frequency from 1GHz to 3GHz. Within this bandwidth, the LNA has a gain of 7.5dB and a minimum noise figure of 2.5dB while consumes a 7mW of power. The results indicate that the proposed input-network effectively alleviates the tradeoff between noise figure and bandwidth without requiring extra power consumption.
