J. Semicond. > Volume 30 > Issue 4 > Article Number: 045001

Design of a 24–40 GHz balanced low noise amplifier using Lange couplers

Zhang Zongnan , Huang Qinghua , Hao Mingli , Yang Hao and Zhang Haiying

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Abstract: 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.

Key words: Lange couplerbalanced LNAlow loss pHEMT


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Zhang Z N, Huang Q H, Hao M L, Yang H, Zhang H Y. Design of a 24–40 GHz balanced low noise amplifier using Lange couplers[J]. J. Semicond., 2009, 30(4): 045001. doi: 10.1088/1674-4926/30/4/045001.

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Manuscript received: 18 August 2015 Manuscript revised: 05 November 2008 Online: Published: 01 April 2009

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