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A 31.7-GHz high linearity millimeter-wave CMOS LNA using an ultra-wideband input matching technique

Journal of Semiconductors 2012年第12期33卷 112-117页

作者：杨格亮王志功李智群李芹李竹刘法恩 Institute of RF-&OE-ICs Southeast University

A CMOS low-noise amplifier （LNA） operating at 31.7 GHz with a low input return loss （S11） and high linearity is proposed. The wideband input matching was achieved by employing a simple LC compounded network to generate more than one S11 dip below -10 dB level. The principle of the matching circuit is analyzed and the critical factors with significant effect on the input impedance （Zin） are determined. The relationship between the input impedance and the load configuration is explored in depth, which is seldom concentrated upon previously. In addition, the noise of the input stage is modeled using a cascading matrix instead of conventional noise theory. In this way Zin and the noise figure can be calculated using one uniform formula. The linearity analysis is also performed in this paper. Finally, an LNA was designed for demonstration purposes. The measurement results show that the proposed LNA achieves a maximum power gain of 9.7 dB and an input return loss of 〈 -10 dB from 29 GHz to an elevated frequency limited by the measuring range. The measured input-referred compression point and the third order inter-modulation point are -7.8 and 5.8 dBm, respectively. The LNA is fabricated in a 90-nm RF CMOS process and occupies an area of 755 × 670μm2 including pads. The whole circuit dissipates a DC power of 24 mW from one 1.3-V supply.

关键词： CMOS low noise amplifier input matching millimeter-wave

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An inductorless multi-mode RF front end for GNSS receiver in 55 nm CMOS

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Journal of Semiconductors 2015年第10期36卷 142-148页

作者：罗彦彬马成炎甘业兵钱敏叶甜春 Institute of Microelectronics Chinese Academy of Sciences Hangzhou Zhongke Microelectronics Co.Ltd.

An inductorless multi-mode RF front end for a global navigation satellite system （GNSS） receiver is presented. Unlike the traditional topology of a low noise amplifier （LNA）, the inductorless current-mode noise- canceling LNA is applied in this design. The high-impedance-input radio frequency amplifier （RFA） further am- plifies the GNSS signals and changes the single-end signal path into fully differential. The passive mixer down- converts the signals to the intermediate frequency （IF） band and conveys the signals to the analogue blocks. The local oscillator （LO） buffer divides the output frequency of the voltage controlled oscillator （VCO） and generates 25%-duty-cycle quadrature square waves to drive the mixer. Our measurement results display that the implemented RF front end achieves good overall performance while consuming only 6.7 mA from 1.2 V supply. The input return loss is better than -26 dB and the ultra low noise figure of 1.43 dB leads to high sensitivity of the GNSS receiver. The input 1 dB compression point is -43 dBm at the high gain of 48 dB. The designed circuit is fabricated in 55 nm CMOS technology and the die area, which is much smaller than traditional circuit, is around 220×280 μm2.

关键词： RF front end noise figure (NF) input matching linearity GNSS receiver

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