0.7-7GHz宽带射频芯片接收前端的研究与设计

发布时间：2017-12-28 01:13

本文关键词：0.7-7GHz宽带射频芯片接收前端的研究与设计　出处：《东南大学》2017年硕士论文　论文类型：学位论文

【摘要】：当今无线通信市场迅速增加,涌现了多种无线通信标准,适用于多标准、多频段的芯片成为一个重要的研究方向。0.7-7GHz覆盖IMT-A的各个备选频段同时也兼容部分UWB标准频段。本文对应用于0.7-7GHz的宽带射频芯片接收前端进行了研究与设计,其中包括0.7-7GHz低噪声放大器(LNA)和宽带混频器(Mixer)。首先,基于电阻并联反馈结构,本文设计了应用于0.7-7GHz的宽带低噪声放大器。采用自偏置电阻反馈结构实现宽带输入匹配;应用并联峰化技术和负反馈技术扩展LNA带宽;选择带有峰化电感的PMOS晶体管作负载提高电路高频处的增益,进一步扩展LNA带宽;采用两级峰化结构负载的共源放大器级联使得LNA在0.7-7GHz范围内的增益保持平坦,同时在整个频带范围内保持足够低的噪声系数。设计了测试 PCB 板并完成测试,测试结果良好:2.5dBNF3.1dB,25dBS2127dB,-15dBS11-9.8dB,-33dBS22-6.4dB,IPidB-26dBm,IIP3-1 5dBm。其次,基于噪声抵消技术原理,本文设计了应用于0.7-7GHz的噪声抵消低噪声放大器。采用负反馈技术来实现宽带输入匹配;应用噪声抵消技术实现噪声抵消,改善LNA的噪声性能,同时实现单端转差分的转换;利用电流复用技术提高输入跨导,提高环路增益,改善噪声系数,缓解了低电源电压的限制;应用前馈噪声抵消技术进一步改善噪声系数;输出采用交叉耦合的平衡Buffer来提高差分性能。后仿真结果显示,增益可达 19.5dB,NF2.34dB,S11-11dB,S22-12dB,IP1dB-18.2dBm。随后,本文设计了一种宽带电压型无源混频器,包括无源开关对、本振驱动电路和增益可调中频放大器。合理设计无源开关对的尺寸和偏置状态可以提高混频器的线性度和噪声性能;采用本振驱动电路对本振信号进行放大,改善开关管的工作状态,提高线性度和噪声性能,同时有一定的隔离作用,减少本振泄露;增益可调中频放大器具有可变增益和低通滤波的功能。该无源下混频器的中频带宽为300MHz,转换增益两档可调(10dB/4dB),NF(DSB)10dB,IP1dB-7.9dBm。最后,本文基于0.7-7GHz宽带低噪声放大器和宽带无源混频器,完成了 0.7-7GHz宽带射频接收前端的设计,并完成了版图设计和后仿真。射频接收前端的仿真结果表明:在0.7-7GHz频段内S11-10.58dB,输入匹配良好;增益34/40dB两档可调;中频输出带宽300MHz;IP1dB-36.7dBm;IIP3-28.6dBm;NF4dB。后仿真结果满足设计指标且已提交流片。
[Abstract]:Nowadays, the market of wireless communication is increasing rapidly. Many kinds of wireless communication standards have emerged. It is an important research direction to apply to multi standard and multi band chips. The various alternative bands of 0.7-7GHz that cover the IMT-A are also compatible with some of the UWB standard bands. The receiver front-end of the wideband RF chip for 0.7-7GHz is studied and designed in this paper, including 0.7-7GHz low noise amplifier (LNA) and broadband mixer (Mixer). First, based on the resistance parallel feedback structure, this paper designs a broadband low noise amplifier applied to 0.7-7GHz. Since the implementation of broadband input matching bias resistor feedback structure; application of shunt peaking technology and negative feedback technology to extend the bandwidth of LNA; select PMOS transistor with peaking inductor for high frequency circuit load to improve the gain, further expansion of LNA bandwidth; cascaded common source amplifier using two peak load structure makes the LNA in the range of 0.7-7GHz the gain remain flat while keeping the noise coefficient is low enough in the whole frequency range. Design the test PCB board and complete the test, the test results are good: 2.5dBNF3.1dB, 25dBS2127dB, -15dBS11-9.8dB, -33dBS22-6.4dB, IPidB-26dBm, IIP3-1 5dBm. Secondly, based on the principle of noise cancellation, a noise canceling low noise amplifier used in 0.7-7GHz is designed. Using negative feedback technology to realize wideband input matching; realization of Noise Cancellation Application noise cancellation technology, to improve the noise performance of the LNA, and realize the conversion of single ended to differential; improve the input transconductance using current reuse technique, improve loop gain, improve the noise coefficient, alleviate the low supply voltage limit; further improve the noise coefficient by feedforward noise cancellation technology; balance Buffer output by cross coupling to improve the performance of differential. The simulation results show that the gain can reach 19.5dB, NF2.34dB, S11-11dB, S22-12dB, IP1dB-18.2dBm. Then, a broadband voltage type passive mixer is designed, including passive switch pair, local oscillator drive circuit and gain adjustable intermediate frequency amplifier. Reasonable design of passive switch size and bias can improve the linearity and noise performance of the mixer; the vibration driving circuit to amplify the vibration signal, the switch to improve working condition, improve the linearity and noise performance, and the effect of isolation, reduce the local oscillator leakage; adjustable gain amplifier with intermediate frequency variable gain and low pass filter function. The middle frequency bandwidth of the passive mixer is 300MHz, the conversion gain two gear adjustable (10dB/4dB), NF (DSB) 10dB, IP1dB-7.9dBm. Finally, based on the 0.7-7GHz broadband LNA and the broadband passive mixer, the design of the 0.7-7GHz broadband RF receiver front end is completed, and the layout design and post simulation are completed. The simulation results of RF receiver front-end show that: in the 0.7-7GHz band, S11-10.58dB input match well; gain 34/40dB two files can be adjusted; if output bandwidth 300MHz; IP1dB-36.7dBm; IIP3-28.6dBm; NF4dB. After the simulation results meet the design specifications and has been submitted to the.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN92;TN851

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