基于电流驱动无源混频器的宽带接收机关键技术研究

发布时间：2018-01-14 14:19

本文关键词：基于电流驱动无源混频器的宽带接收机关键技术研究　出处：《中国科学技术大学》2014年博士论文　论文类型：学位论文

【摘要】：无线通信市场近年来迅猛发展,各种无线设备给人们的生活提供了便利,在人们的生活中扮演着越来越重要的角色。生活中的各种无线通信协议的射频前端电路互不兼容,这给人们的便携化带来了不便。因此设计能够兼容多种无线通信协议的射频前端就成为了设计者们需要面对的问题,而多模多频带的宽带接收机又是需要攻克的重点和难点。本文分别对多模多频带的宽带接收机的核心模块进行了研究,并在此基础上研究完整的接收机电路。低噪声放大器(Low Noise Amplifier)是接收机链路的第一级电路,需要实现宽带范围内的输入匹配,并在功耗尽可能低的条件下得到低噪声和适当的增益。本文首次提出了一种正反馈环路用来改善因为隔直电容带来的低频增益和噪声的恶化。同时本文综合利用电流复用技术和电容交叉耦合技术来降低电路的功耗,采用电阻负反馈结构来提高输入匹配的带宽,同时分析了反馈电阻对于各个性能参数的影响从而获得了最优的噪声和增益。混频器(Mixer)是接收机链路的第二级电路,也是完成变频功能的核心模块。因为线性度的考虑,LNA的增益一般不会过大,因此混频器的噪声系数应该尽可能的低。本文在分析了跨导管和开关管对于混频器的噪声贡献后,采用了噪声抵消的技术来降低跨导管的噪声,同时采用电流抽取技术降低开关管的噪声。在综合分析了电流抽取技术对于增益、噪声的影响后选择了一个最佳的电流抽取比例。本文采用基于电流驱动无源混频器的架构来研究多模多频段的宽带接收机。在分析了传统的拓扑结构的优缺点后,本文提出了一种新的方法来提高无源混频器得到的交流电流比例。同时在分析了传统的跨阻放大器的缺点后,本文针对性的进行了改进,从而在功耗,噪声和稳定性等方面有了比较大的改善。所设计的电路使用SMIC65nm工艺流片,测试结果验证了设计思想。
[Abstract]:Wireless communication market in recent years, the rapid development of various wireless devices provide convenience to people's lives, plays an increasingly important role in people's lives. All kinds of RF front-end circuit of wireless communication protocol in life are not compatible, which brings inconvenience to people. So the design of portable RF front-end can be compatible with a variety of the wireless communication protocol has become the designers need to face the problem, and the multi band and multi-mode wideband receiver is emphasis and difficulty of capture. The core module in this paper on multi-mode multi band wideband receiver is studied, the receiver circuit and based on the full study.
Low noise amplifier (Low Noise Amplifier) is the first stage circuit receiver link, need to realize the broadband range of input matching, low noise and appropriate gain and power consumption as low as possible under the conditions. This paper first presents a positive feedback loop is used to improve the low frequency due to the deterioration of gain and noise for capacitor brings at the same time. The comprehensive utilization of the current reuse technology and the capacitive cross coupling technique to reduce the power consumption of the circuit, the resistance of negative feedback to improve the input matching bandwidth, and analyzes the influence on the personality of the feedback resistance parameters to obtain the optimal noise and gain.
The mixer (Mixer) is second level circuit receiver link, the core module is to complete the conversion function. Because of the linearity of the consideration, the gain of LNA is generally not too large, so the noise coefficient of the mixer should be as low as possible. Based on the analysis of the cross tube and switch to the noise contribution to the mixer after use noise cancellation technology to reduce the noise across the conduit, and the current extraction technology to reduce the switching noise. After analyzing the current extraction technology to gain the effect of noise after choosing a best current extraction ratio.
This paper uses broadband receiver driven current passive mixer architecture based on multi-mode multi band. The research analyzes the advantages and disadvantages of the traditional topology, this paper proposes a new method to improve the current ratio of passive mixer obtained. At the same time in the analysis of the transimpedance amplifier, the disadvantages of the traditional, according to the performance was improved, resulting in power consumption, noise and stability has been greatly improved. The circuit using the SMIC65nm process, the test results verified the design idea.

【学位授予单位】：中国科学技术大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN851

【共引文献】