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An Ultra-wideband Doubler Chain with 43–65 dBc Fundamental Rejection in Ku/K/Ka Band

Chinese Journal of Electronics 2024年第5期33卷 1204-1217页

作者： Long WANG Jixin CHEN Debin HOU Xiaojie XU Zekun LI Dawei TANG Rui ZHOU Hao QI Yu XIANG State Key Laboratory of Millimeter Waves Southeast University misic microelectronics co.ltd.

In this paper, a double-balanced doubler chain with >43-dBc fundamental rejection over an ultra-wide bandwidth in 0.13-μm SiGe BiCMOS technology is proposed. To achieve high fundamental rejection, high output power, and high conversion gain over an ultra-wideband, a double-balanced doubler chain with pre-and post-drivers employs a bandwidth broadening technique and a ground shielding strategy. Analysis and comparison of the singlebalanced and double-balanced doublers were conducted, with a focus on their fundamental rejection and circuit imbalance. Three doublers, including a passive single-balanced doubler, an active single-balanced doubler, and a passive double-balanced doubler were designed to verify the performance and characteristics of the single-and doublebalanced doublers. Measurements show that the proposed double-balanced doubler chain has approximately 15 dB better fundamental rejection, and more than twice the relative bandwidth compared to the single-balanced doubler chain fabricated with the same process. Over an 86.9% 3-dB bandwidth from 13.4 GHz to 34 GHz, the double-balanced doubler chain delivers 14.7-dBm peak output power and has >43-/33-dBc fundamental/third-harmonic rejection. To the authors' best knowledge, the proposed double-balanced doubler chain shows the highest fundamental rejection over an ultra-wideband among silicon-based doublers at millimeter-wave frequency bands.

关键词： Millimeter wave technology Bandwidth Harmonic analysis Frequency conversion Millimeter wave communication Power generation Gain Doubler Double-balanced Fundamental rejection Single-balanced FREQUENCY DOUBLER POWER-AMPLIFIER GAIN coMPENSATION EFFICIENCY SILIcoN

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A 26.5–29.5-GHz Doherty PA with enhanced linearity and efficiency based on adaptive bias circuit for 5G MIMO arrays

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Science China(Information Sciences) 2024年第7期67卷 341-342页

作者： Long WANG Jixin CHEN Debin HOU Xiaojie XU Wei HONG State Key Laboratory of Millimeter Waves Southeast University misic microelectronics co. Ltd.

Power amplifiers (PAs) play a crucial role in achieving key performance metrics such as efficiency, power, and ***, in the millimeter-wave frequency range, the performance of active devices rapidly deteriorates with increasing frequency. The typical Doherty architecture, through load modulation techniques, can achieve high back-off efficiency [1]. To enhance the linearity of the PA, adaptive bias circuits (ADBs) have been widely adopted [2, 3].

关键词： POWER-AMPLIFIER

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A compact MIMO automotive radar using phase-aligned daisy-chain cascading topology and elevation compensation for 2D angle estimation

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Science China(Information Sciences) 2023年第6期66卷 222-241页

作者： Rui ZHOU Jixin CHEN Yan HUANG Gang XU Debin HOU Bangjie ZHANG Zekun LI Yu XIANG Wei HONG State Key Laboratory of Millimeter Waves Southeast University Purple Mountain Laboratories 3. misic microelectronics co. Ltd.

To design a high-performance multiple-input multiple-output(MIMO)automotive radar system with simple hardware architecture, this study presents a daisy-chain cascading design scheme, implementing the two-dimensional(2D)nonuniform antenna array with high-gain antennas for 2D angle estimation. The improvements in the designed radar system are primarily divided into three parts. First, a daisy-chain cascading topology will cause severe phase deviations; hence, we rigorously analyzed the influence of the phase deviations and proposed a low-cost phase-alignment procedure to address this concern. Second, to obtain 2D angular resolution and a longer working range with limited channels, a novel 2D antenna array design principle facilitating the arrangement of high-gain antennas was presented. Third, a new phase compensation procedure was developed to mitigate the deterioration of angular accuracy in the elevation plane. Based on the proposed design scheme, a frequency-modulated continuous-wave(FMCW)radar prototype with two transceiver chips, i.e., six transmitters and eight receivers, was successfully built. The prototype radar system’s performance was tested through an anechoic chamber and outdoor experiments. consequently,an angular resolution of 3.5° in azimuth and 12.5° in elevation was featured in the anechoic ***, using the 2D conventional beam-forming, the outdoor experiment captured high-resolution 2D angular estimation results, thus demonstrating the superior performance of the designed prototype system.

关键词： frequency-modulated continuous-wave radar prototype FMCW multiple-input-multiple-output MIMO phase-alignment daisy-chained cascading topology 2D antenna design elevation compensation

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