A wideband LNA employing gate-inductive-peaking and noise-canceling techniques in 0.18μm CMOS

正This paper presents a wideband low noise amplifier(LNA) for multi-standard radio applications.The low noise characteristic is achieved by the noise-canceling technique while the bandwidth is enhanced by gateinductive -peaking technique.High-frequency noise performance is consequently improved by the flattened gain over the entire operating frequency band.Fabricated in 0.18μm CMOS process,the LNA achieves 2.5 GHz of -3 dB bandwidth and 16 dB of gain.The gain variation is within±0.8 dB from 300 MHz to 2.2 GHz.The measured noise figure(NF) and average HP3 are 3.4 dB and -2 dBm,respectively.The proposed LNA occupies 0.39 mm2 core chip area.Operating at 1.8 V,the LNA drains a current of 11.7 mA.     

A reconfigurable passive mixer for multimode multistandard receivers in 0.18 μm CMOS

This paper presents a reconfigurable quadrature passive mixer for multimode multistandard receivers. By using controllable transconductor and transimpedance-amplifier stages, the voltage conversion gain of the mixer is reconfigured according to the requirement of the selected communication standard Other characteristics such as noises figure, linearity and power consumption are also reconfigured consequently. The design concept is verified by implementing a quadrature passive mixer in 0.18 μm CMOS technology. On wafer measurement results show that, with the input radio frequency ranges from 700 MHz to 2.3 GHz, the mixer achieves a controllable voltage conversion gain from 4 to 22 dB with a step size of 6 dB. The measured maximum ⅡP3 is 8.5 dBm and the minimum noise figure is 8.0 dB. The consumed current for a single branch (I or Q) ranges from 3.1 to 5.6 mA from a 1.8 V supply voltage. The chip occupies an area of 0.71 mm² including pads.     

基于混合波束赋形架构的数字中频系统方案设计

对基于混合波束赋形的系统架构进行了研究。提出了新型的混合波束赋形架构,并采用高集成宽带收发芯片AD9361与全可编程片上系统进行多通道数字中频系统的搭建。测试结果表明该方案稳定可靠,满足大带宽高速传输的需求。     

A wideband current-commutating passive mixer for multi-standard receivers in a 0.18 μm CMOS

This paper reports a wideband passive mixer for direct conversion multi-standard receivers.A brief comparison between current-commutating passive mixers and active mixers is presented.The effect of source and load impedance on the linearity of a mixer is analyzed.Specially,the impact of the input impedance of the transimpedance amplifier(TIA),which acts as the load impedance of a mixer,is investigated in detail.The analysis is verified by a passive mixer implemented with 0.18 m CMOS technology.The circuit is inductorless and can operate over a broad frequency range.On wafer measurements show that,with radio frequency(RF) ranges from 700 MHz to 2.3 GHz,the mixer achieves 21 dB of conversion voltage gain with a-1 dB intermediate frequency(IF) bandwidth of 10 MHz.The measured IIP3 is 9 dBm and the measured double-sideband noise figure(NF) is 10.6 dB at 10 MHz output.The chip occupies an area of 0.19 mm2 and drains a current of 5.5 mA from a 1.8 V supply.     

一种利用栅极电感峰化和噪声抵消技术的CMOS宽带低噪声放大器的设计

本文给出了一种应用于多模多标准接收机的宽带低噪声放大器的设计。采用噪声抵消技术实现了低噪声特性,同时采用栅极电感峰化技术实现了宽带平稳增益,进而提高了高频处得噪声性能。芯片在0.18 μm CMOS 工艺下制造,测试结果表明,该低噪放的-3dB带宽为2.5 GHz,增益为16 dB。在300 MHz 到2.2 GHz 带宽内的增益变化在0.8 dB之内。噪声系数为3.4 dB,不同频点处测得的平均IIP3 为-2 dBm。该低噪放的核心芯片面积为0.39mm2, 在1.8V供电电压下,抽取直流电流11.7 mA。