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A wide band (24–40 GHz) fully integrated balanced low noise amplifier (LNA) using Lange couplers was designed and fabricated with a 0.15 μm pseudomorphic HEMT (pHEMT) technology. A new method to design a low-loss and high-coupling Lange coupler for wide band application in microwave frequency was also presented. This Lange coupler has a minimum loss of 0.09 dB and a maximum loss of 0.2 dB over the bandwidth from 20 to 45 GHz. The measured results show that the realized four-stage balanced LNA using this Lange coupler exhibites a noise figure (NF) of less than 2.7 dB and the maximum gain of 30 dB; moreover, a noticeably improved reflection performance is achieved. The input VSWR and the output VSWR are respectively less than 1.45 and 1.35 dB across the 24–40 GHz frequency range.
Fully integrated balanced low noise amplifier (LNA) using Lange couplers was designed and fabricated with 0.15 μm pseudomorphic HEMT (pHEMT) technology. A new method to design a low-loss and high-coupling Lange coupler for wide band application in microwave frequency was also presented. This Lange coupler has a minimum loss of 0.09 dB and a maximum loss of 0.2 dB over the bandwidth from 20 to 45 GHz. The measured results show that the realized four-stage balanced LNA using this Lange coupler exhibites a noise figure (NF) of less than 2.7 dB and the maximum gain of 30 dB; moreover, a noticeably improved reflection performance was achieved. The input VSWR and the output VSWR are respectively less than 1.45 and 1.35 dB across the 24-40 GHz frequency range.