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Design and implementation of coupler-based Ka-band CMOS power splitters
Analog Integrated Circuits and Signal Processing ( IF 1.2 ) Pub Date : 2021-02-11 , DOI: 10.1007/s10470-021-01801-6
Yo-Sheng Lin , Bing-Ting Yeh , Kai-Siang Lan

We propose a novel power splitter (or divider) comprising two back-to-back quarter-wavelength (λ/4) coupled lines (i.e. coupler). To improve the isolation between the output ports (i.e. ports 2 and 3), an isolation resistor R is included. Three power dividers are designed and implemented. To enhance the reflection coefficients, and S21 and S31 and their amplitude imbalance (AI) and phase difference (PD), the output ports transmission lines (TLs) of the first power divider (i.e. divider-1) with R of 100 Ω adopt tapered width from 8 to 3 μm. For contrast, the second power divider (i.e. divider-2) with R of 100 Ω uses tapered width from 8 to 3 μm for the input port (i.e. port 1) TL. To study the effect of R on the performance of the power divider, the third power divider (i.e. divider-3) has the same layout with divider-2 except R equal to 50 Ω. Prominent results are obtained. For instance, divider-1 occupies a small chip area of 0.026 mm2 (i.e. 2.3 × 10−4λ 20 ), one of the smallest normalized chip areas ever reported for millimeter-wave power dividers. Moreover, at 33 GHz, divider-1 achieves excellent S11 of − 13.1 dB, S22 of − 14 dB, S33 of − 14.2 dB, and S32 of − 17.9 dB, S21 of − 4.22 dB, S31 of − 3.99 dB, AI of − 0.23 dB, and PD of 2.1°. The remarkable results of the proposed power divider structure indicate that it is suitable for Ka-band and even higher frequency transceivers.



中文翻译:

基于耦合器的Ka波段CMOS功率分配器的设计与实现

我们提出了一种新颖的功率分配器(或分配器),该功率分配器包括两条背对背的四分之一波长(λ/ 4)耦合线(即耦合器)。为了改善输出端口(即端口2和3)之间的隔离,包括了隔离电阻R。设计并实现了三个功率分配器。为了提高反射系数,S 21和S 31以及其幅度不平衡(AI)和相位差(PD),R为100的第一功率分配器(即分压器1)的输出端口传输线(TL)采用8至3μm的锥形宽度。相比之下,第二个功率分配器(即分压器2)的R为100Ω,输入端口(即端口1)TL的锥度宽度为8到3μm。为了研究R对功率分配器性能的影响,第三个功率分配器(即分压器3)与分压器2的布局相同,但R等于50。获得了突出的结果。例如,除法器- 1占据0.026毫米的芯片面积小的2(即2.3×10 -4 λ 2 0 ),这是毫米波功率分配器有史以来最小的标准化芯片面积之一。此外,在33 GHz时,分频器1的S 11为-13.1 dB,S 22为-14 dB,S 33为-14.2 dB,S 32为-17.9 dB,S 21为-4.22 dB,S 31为− 3.99 dB,AI为− 0.23 dB,PD为2.1°。所提出的功率分配器结构的显着结果表明,它适用于Ka波段甚至更高频率的收发器。

更新日期:2021-02-11
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