C类电压控制振荡器的研究

发布时间：2018-06-02 03:46

本文选题：电感电容压控振荡器 + C类　；参考：《电子科技大学》2015年硕士论文

【摘要】：振荡器是一种不需要外加激励信号就能自动将直流能量变换为周期性交变能量的装置,它是许多电子系统的主要部分之一,应用十分广泛。随着无线通信终端、特别是手持无线设备(如手机)的普及,使得射频前端芯片的设计越来越趋向于小型化、低成本、低功耗方向发展。假如一个集成收发系统能够实现0.5V的供电电压,甚至更低,那么目前炙手可热的太阳能电池就可能为这些无线通信系统供电,这也将为节能减排做出巨大贡献。本文即实现了一个应用于太阳能超低电压下带有振幅反馈的C类电压控制振荡器,主要内容如下:1.研究了C类VCO由来,解释为什么与其他类型VCO相对比,它能更有效的降低相位噪声与损耗,研究其结构中的核心要点所在,并总结出规律。2.研究交叉耦合式LC-VCO所存在的问题,诸如如何简化电路结构、如何减少谐振回路所带来的损耗等等。3.设计了一个动态偏置的控制振幅反馈回路来实现超低电压供电,它可以把LC-VCO的偏置条件从最初起振时的AB类偏置转变为稳定的C类低电流谐振偏置。4.设计了两级缓冲放大器,第一级提供高输入阻抗,第二级用于增加VCO的调谐范围并使其易于起振。5.本研究的结果是基于Cadence开发环境及Goldengate仿真器进行,采用65-nm RF CMOS工艺,设计实现了一个适用于中心频率2.43GHz的低相噪、低损耗的C类电感电容压控振荡器。最终测试加工后的芯片,当供电电压为0.3V,工作于2.43GHz下,位于1 MHz偏频下的相位噪声为-111 d Bc/Hz,功率损耗为0.58 m W,性能优良系数为-181d Bc/Hz。
[Abstract]:Oscillator is a kind of device which can automatically convert DC energy into periodic alternating energy without additional excitation signal. It is one of the main parts of many electronic systems and is widely used. With the popularity of wireless communication terminals, especially handheld wireless devices (such as mobile phones), the design of RF front-end chips is becoming more and more miniaturized, low-cost and low-power. If an integrated transceiver system can supply a voltage of 0.5V or lower, the current hot solar cells could power these wireless communication systems, which will also make a great contribution to energy saving and emission reduction. In this paper, a class C voltage controlled oscillator with amplitude feedback is implemented for solar ultra-low voltage. The main contents are as follows: 1. This paper studies the origin of class C VCO, explains why it can reduce phase noise and loss more effectively than other types of VCO, studies the key points in its structure, and summarizes the rule. The problems of cross-coupled LC-VCO are studied, such as how to simplify the circuit structure, how to reduce the loss caused by the resonant circuit, and so on. A dynamic bias control amplitude feedback loop is designed to realize ultra-low voltage power supply. It can change the bias condition of LC-VCO from class AB bias to stable class C low current resonant bias .4. A two-stage buffer amplifier is designed. The first stage provides high input impedance and the second stage is used to increase the tuning range of VCO and make it easy to vibrate. The results of this study are based on the Cadence development environment and Goldengate simulator. Using the 65-nm RF CMOS process, a low phase noise and low loss class C inductance capacitor voltage-controlled oscillator suitable for central frequency 2.43GHz is designed and implemented. Finally, when the power supply voltage is 0.3 V, the phase noise at 1 MHz bias frequency is -111dBc / Hz, the power loss is 0.58mW, and the excellent performance coefficient is -181dBc / Hz.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN752

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