A Multi-band CMOS Low Noise Amplifier for Multi-standard Wireless Receivers

A novel multi-band low noise amplifier (LNA) that allows simultaneous reception of signals from several wireless standards is designed and implemented using a 0.18-μm CMOS technology. The circuit topology consists of a 3-stage wideband LNA and 2 notch filters. The designed LNA can provide concurrent three bands over 0.935~5.825 GHz with measured gain (S21) of 15~24 dB, input reflection ratio (S11) of -35~-7 dB, noise figure (NF) of 4.4~4.78 dB, and 3^rd order input intercept point (IIP3) of -15.3~-12.4dBm respectively. In addition, a minimum 8 dB of inter-band gain suppression is achieved. This work has achieved a better figure of merit (FOM) than other related works, in terms of gain, noise figure and power consumption trade-offs.

I. Introduction

Recent developments in wireless communication have resulted in many widely adopted wireless standards, with each catering to different needs depending on their data rates, operating range, bandwidth requirement and carrier frequency. Although multi-band transceivers have been introduced, they mainly focus on band switching which forbid the concurrent operation of various standards [1]. It is desirable to provide true multi-band transceiver where various wireless standards can operate simultaneously to extend its functionalities [2].