A low noise figure 2-GHz bandwidth LNA using resistive feedback with additional input inductors

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 0.13 μm CMOS technology to verify the concept. A À10 dB S11 is achieved in a wide range of frequency from 1 GHz to 3 GHz. Within this bandwidth, the LNA has a gain of 7.5 dB and a minimum noise figure of 2.5 dB while consumes a 7 mW of power. The results indicate that the proposed input-network effectively alleviates the tradeoff between noise figure and bandwidth without requiring extra power consumption.

An effective DC offset calibration method combined with analog and digital circuits for direct conversion receivers

“…1. A broadband LNA using resistance feedback suppresses the noise from the following stage [18,19]. The current driven passive Mixers (I/Q) as proposed in [20,21] convert the signals down to the baseband.…”