A technique for bandwidth extension and noise optimization of wideband low-noise amplifier with dual feedback loops

摘要

A technique for bandwidth extension and noise optimization of wideband low-noise amplifier with dual feedback loops is presented. A LC-ladder matching network has been added in front of conventional amplifier with dual feedback loops. Detailed circuit analysis and general design procedures for the modified amplifier have been provided. The technique is applied to an amplifier covering the frequency range from DC to 6 GHz in a 0.5 μm InGaAs E-mode pHEMT process. Post-layout simulation shows S_(11) below -10 dB, S_(22) below - 10 dB, flat S_(21) of 16 ± 0.2 dB, and flat NF of 1.85 ± 0.35 dB across the entire band, which confirms the improvement in bandwidth and noise performance.