A 24-GHz Receiver Frontend With an LO Signal Generator in 0.18-$\mu$m CMOS
A 24-GHz Receiver Frontend With an LO Signal Generator in 0.18-$\mu$m CMOS
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DOI：
10.1109/tmtt.2008.920154
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发表时间：
2008-05
影响因子：
4.3
通讯作者：
Yu-hsin Chen;H. Hsieh;Liang-Hung Lu
中科院分区：
文献类型：
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作者：
Yu-hsin Chen;H. Hsieh;Liang-Hung Lu
利用一个标准的0.18妈妈CMOS工艺，接收器前端和本地振荡器（LO）模块实现在24 GHz的工业，科学，医疗频段的RF应用。该前端由三级低噪声放大器、下变频混频器和中频放大器组成。在中频频率为4.82 GHz时，该电路的变频增益为28.4 dB，噪声系数为6.0 dB，输入回波损耗优于14 dB。接收机前端的测量P in - 1dB和IIP 3分别为-23.2和-13.0 dBm。此外，本研究亦设计了一个产生所需双下变频本振信号的电路模块。本振发生器由一个19 GHz的低相位噪声压控振荡器（VCO），一个4：1分频器，和一个正交相位调谐电路。测试结果表明，该压控振荡器的调谐范围为850 MHz，失调频率为1 MHz时的相位噪声为-110 dBc/Hz。在1.8 V电源电压下工作时，接收器前端和LO发生器的电流消耗均为30 mA。
Utilizing a standard 0.18-mum CMOS process, a receiver frontend and a local oscillator (LO) module are implemented for RF applications at the 24-GHz industrial, scientific, medical band. The proposed frontend is composed of a three-stage low-noise amplifier, a down-conversion mixer, and IF amplifiers. With an IF frequency of 4.82 GHz, the fabricated circuit demonstrates a conversion gain of 28.4 dB and a noise figure of 6.0 dB while maintaining an input return loss better than 14 dB. The measured P in - 1dB and IIP3 of the receiver frontend are -23.2 and -13.0 dBm, respectively. In addition, a circuit module, which generates the required dual down-conversion LO signals, is also included in this study. The proposed LO generator consists of a 19-GHz low-phase-noise voltage-controlled oscillator (VCO), a 4 : 1 frequency divider, and a quadrature phase-tuning circuit. From the measurement results, the VCO exhibits a tuning range of 850 MHz and a phase noise of -110 dBc/Hz at 1-MHz offset frequency. Operated at a supply voltage of 1.8 V, the current consumptions for the receiver frontend and the LO generator are both 30 mA.