Article Details

Title · Authors · Abstract · Keywords · DOI · References

Broadband Double-balanced Mixer with High Isolation Adopting Improved LO Balun

WANG Xiangdong, LUO Liwei, YANG Ke, WANG Qiyu

(Sichuan YiFeng Electronic Science and Technology Co., Ltd., Chengdu 610091, China)

Section：Electronic Engineering · Vol. 2026, Issue 4 · Pages：17-23 · 2096-4706（2026）04-0017-07 · CLC number：TN773 · Document code：A · DOI：10.19850/j.cnki.2096-4706.2026.04.004

Abstract

To improve the isolation of the broadband double-balanced mixer, an improved LO Balun is proposed. A grounded tuning capacitor is introduced at the midpoint of the primary coupled lines of the LO Balun, which effectively improves the amplitude balance and phase balance of the LO Balun over a broadband. In addition, impedance matching networks are introduced at the RF and LO ports, which improves the port matching characteristics and facilitates system cascade application. The mixer is manufactured based on the domestically independent and controllable 0.15μm GaAs pHEMT process, with a chip area of 1.6 mm × 1.35 mm. Measurement results show that the LO-RF and LO-IF isolations are greater than 49.1 dB and 38.6 dB, respectively, which are significantly higher than those of similar devices.

Keywords

double-balanced mixer; Balun; broadband; isolation

References

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About the authors

Wang Xiangdong (1989.02-), male, Han ethnicity, Shanghai native, engineer, master's student, research direction: III-V compound power amplifier MMIC.