Design and analysis of a 1.1 and 2.4 GHz concurrent dual-band low noise amplifier for multiband radios.

This paper presents the design and implementation of a dual-band low noise amplifier (DBLNA) operating at 1.1 GHz and 2.4 GHz. The DBLNA employs a second-order dual-band matching network, which is designed using the proposed impedance and frequency transformation technique. The DBLNA has two stages in cascade topology for its high output impedance and high voltage gain. Modified output load is designed to optimize interference rejection. The implemented circuit is fabricated as a microwave integrated circuit (MIC) on the FR-4 substrate. The designed DBLNA achieves a very high measured voltage gain of 24.4 dB and 20.1 dB at 1.1 GHz and 2.4 GHz, respectively. The measured NF of the DBLNA is 2.6 dB and 3 dB at 1.1 GHz and 2.4 GHz, respectively. The interference rejection between passbands at 1.6 GHz is 53.2 dB and stopband rejection ratio is 40.4 dB. The LNA consumes 108 mW from a 3 V supply. The measured P 1 dB performance is −10 dBm and −5.1 dBm at 1.1 GHz and 2.4 GHz, respectively. [ABSTRACT FROM AUTHOR]