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首页> 外文期刊>Microelectronics journal >An IIP3 enhancement technique for CMOS active mixers with a source-degenerated transconductance stage
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An IIP3 enhancement technique for CMOS active mixers with a source-degenerated transconductance stage

机译：具有源极退化跨导级的CMOS有源混频器的IIP3增强技术

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摘要

In this paper, a new third-order input intercept point (IIP3) enhancement technique is introduced for CMOS active mixers with a source-degenerated transconductance stage. In the proposed technique, the third-order Volterra kernel of the output current of the transconductance stage is significantly attenuated by producing a new interaction term which is in an equal magnitude but an opposite phase related to the stage's total third-order intermodulation (IM3) current. For this end, a second-order intermodulation (IM2) current with an adjustable magnitude and phase is produced and injected to the transconductance stage. The proposed mixer has been designed for IEEE 802.11 applications with input frequency and output bandwidth equal to 2.4 GHz and 20 MHz, respectively, and simulated using a 90 nm RF-CMOS technology. Spectre-RF simulation results reveals that the IIP3 improves about 17.5 dB and 18.2 dB compared to the conventional mixers with source-degenerated and fully-differential transconductance stages, respectively, while only 1.2 mA extra current is drawn from a single 1.2 V power supply. In addition, the proposed technique has no effect on other parameters of the mixer such as the noise figure and conversion gain. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文针对具有源极退化跨导级的CMOS有源混频器引入了一种新的三阶输入截取点（IIP3）增强技术。在所提出的技术中，跨导级输出电流的三阶Volterra核通过产生一个新的相互作用项而被显着衰减，该相互作用项的大小相等，但与该级的总三阶互调（IM3）有关当前。为此，会产生幅度和相位可调的二阶互调（IM2）电流，并将其注入跨导级。拟议的混频器针对输入频率和输出带宽分别等于2.4 GHz和20 MHz的IEEE 802.11应用而设计，并使用90 nm RF-CMOS技术进行了仿真。 Spectre-RF仿真结果表明，与具有源极退化和全差分跨导级的常规混频器相比，IIP3分别提高了约17.5 dB和18.2 dB，而单个1.2 V电源仅吸收了1.2 mA的额外电流。另外，所提出的技术对混频器的其他参数如噪声系数和转换增益没有影响。 （C）2016 Elsevier Ltd.保留所有权利。

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