A 66-112.5 GHz low noise amplifier with minimum NF of 3.9 dB in 0.1-μm GaAs pHEMT technology
A wideband low noise amplifier(LNA)covering the whole W-band in 0.1-μm GaAs pHEMT technol-ogy is designed.To reduce the inter-stage crosstalk and obtain wideband matching,a bypass circuit composed of dual shunt capacitors is proposed to provide wideband RF grounding.The wideband input matching and optimal noise matching are implemented by a dual-resonance input matching network.The measurement results exhibit a peak gain of 20.4 dB at 108 GHz.The measured small signal gain is 16.9-20.4 dB across 66-112.5 GHz.The measured noise figure(NF)is 3.9 dB at 90 GHz.The measured input 1-dB compression point(IP1dB)is around-12 dBm in W-band.