共查询到19条相似文献,搜索用时 93 毫秒
1.
提出了一个基于0.18μm标准CMOS工艺实现的四级差分环形压控振荡器.全差分环形压控振荡器采用带对称负载的差分延时单元.仿真结果表明,压控振荡器的频率范围在最坏情况为0.21~1.18GHz;偏离中心频率10MHz情况下,压控振荡器的相位噪声为-118.13dBc/Hz; 1.8V电源电压下,中心频率为600MHz时,压控振荡器的功耗仅有4.16mW;版图面积约为0.006mm2.可应用于锁相环和频率综合器设计中. 相似文献
2.
采用标准的0.13μm CMOS工艺实现了0.5V电源电压,3GHz LC压控振荡器。为了适应低电压工作,并实现低相位噪声,该压控振荡器采用了NMOS差分对的电压偏置振荡器结构,去除尾电流,以尾电感代替,采用感性压控端,增加升压电路结构使变容管的一端升压,这样控制电压变化范围得到扩展。测试结果显示,当电源电压为0.5V,振荡频率为3.126GHz时,在相位噪声为-113.83dBc/Hz@1MHz,调谐范围为12%,核心电路功耗仅1.765mW,该振荡器的归一化品质因数可达-186.2dB,芯片面积为0.96mm×0.9mm。 相似文献
3.
4.
5.
基于3.3V 0.35μm TSMC 2P4M CMOS体硅工艺,设计了一款1GHz多频带数模混合压控振荡器.采用环形振荡器加上数模转换器结构,控制流入压控振荡器的电流来调节压控振荡器的频率而实现频带切换.仿真结果表明,在1V~2V的电压调节范围内,压控振荡器输出频率范围为823.3MHz~1.061GHz,且压控振荡器的增益仅有36.6MHz/V,振荡频率为1.0612GHz时,频率偏差1MHz处的相位噪声为-96.35dBc/Hz,在获得较大频率调节范围的同时也能保持很低的增益,从而提高了压控振荡器的噪声性能. 相似文献
6.
7.
集成低功耗CMOS压控振荡器及其二分频器 总被引:3,自引:3,他引:0
实现了应用于无线局域网收发机的集成低功耗CMOS压控振荡器及其二分频器.压控振荡器是由在片对称螺旋型电感和差分容抗管组成的LC负阻型振荡器,而二分频器采用了ILFD结构.由于采用了差分LC元件和ILFD技术,整个电路的功耗很低.该电路已经用0.18μm CMOS工艺实现.测试结果表明该电路能产生低相位噪声的3.6/1.8GHz双带本振信号,并具有很宽的可控频率范围.当电源电压为1.5V时,该电路消耗了5mA的电流.芯片面积为1.0mm×1.0mm. 相似文献
8.
集成低功耗CMOS压控振荡器及其二分频器 总被引:1,自引:0,他引:1
实现了应用于无线局域网收发机的集成低功耗CMOS压控振荡器及其二分频器.压控振荡器是由在片对称螺旋型电感和差分容抗管组成的LC负阻型振荡器,而二分频器采用了ILFD结构.由于采用了差分LC元件和ILFD技术,整个电路的功耗很低.该电路已经用0.18μm CMOS工艺实现.测试结果表明该电路能产生低相位噪声的3.6/1.8GHz双带本振信号,并具有很宽的可控频率范围.当电源电压为1.5V时,该电路消耗了5mA的电流.芯片面积为1.0mm×1.0mm. 相似文献
9.
10.
11.
Abhirup Lahiri Norbert Herencsar 《AEUE-International Journal of Electronics and Communications》2012,66(12):1032-1037
This paper proposes a very compact CMOS realization of active RC sinusoidal oscillator capable of generating four quadrature voltage outputs. The oscillator is based on the cascade of lossless and lossy integrators in loop. The governing laws for the condition of oscillation (CO) and the frequency of oscillation (FO) are single-resistance-controlled (SRC) and which allow independent FO tuning. Unlike previously reported SRC-based sinusoidal oscillators based on the active building block (ABB) based approach and which aim at reducing the number of employed ABBs, this direct CMOS realization provides a much reduced transistor count circuit and consequently offers a low power solution. A comparison with previously reported SRC oscillators in terms of number of transistors and current consumption has been provided. As a design example, a 160.2 kHz oscillator (typical process, T = 27 °C) with 82 μW power consumption is designed in 65 nm CMOS technology with supply voltage of ±0.5 V. 相似文献
12.
Venkatesh Srinivasan Syed K. Islam Benjamin J. Blalock 《Analog Integrated Circuits and Signal Processing》2003,34(3):259-263
The variation of phase noise across the frequency of operation of a CMOS ring oscillator is described analytically. The delay element of the ring oscillator considered comprises of a source-coupled differential pair with an active load element. In this circuit topology where the frequency of oscillation is varied by changing the resistance of the load, theory derived in this work predicts that phase noise will remain constant if constant output swing is maintained. Such an oscillator is designed in a 0.5 m CMOS process and the simulation results verify the theoretical analysis. Consequently, an oscillator design methodology is provided that dramatically reduces the phase noise optimization problem to just one frequency within the oscillator's output frequency range. 相似文献
13.
14.
15.
一种频率稳定的改进型CMOS环形振荡器 总被引:5,自引:2,他引:3
在传统的环形振荡器基础上,提出了一种改进的CMOS环形振荡器。它克服了传统CMOS环形振荡器振荡频率随电源电压变化而严重不稳的缺点。通过仿真得到了电源电压与振荡频率的对应关系,取得了满意的结果。 相似文献
16.
本文提出了一种基于周期计算技术的压控振荡器频率-电压调谐曲线的分析方法.在传统的谐波平衡近似方法中,通过大信号非线性分析方法可以计算出一个周期内可变电容的有效电容值.然而通过有效电容推导的调谐曲线并不准确,况且如果高阶谐波分量不可以忽略的话,谐波平衡近似分析方法将会变得很复杂.本文提出的周期计算方法所得到的振荡调谐曲线比传统谐波平衡近似分析方法更加精确.在0.35μm 2P4M CMOS工艺上实现的电感电容压控振荡器的实验测试证明了该理论分析的正确性. 相似文献
17.
18.
19.
Sheng-Lyang Jang Chang-Hao Yang Miin-Horng Juang 《International Journal of Electronics》2013,100(7):691-697
A 6-phase divide-by-3 CMOS injection locked frequency dividers (ILFDs) have been proposed and implemented in a 0.35 μm CMOS process. The ILFD circuits are realised with a 3-stage double cross-coupled CMOS ring oscillator. The self-oscillating voltage controlled oscillator (VCO) is injection-locked by 3th-harmonic input to obtain the division factor of 3. Measurement results show that as the supply voltage varies from 1.2 to 3.5 V, the free-running frequency is from 0.136 to 0.7 GHz. At the incident power of ?5 dBm, the locking range in the divide-by-3 mode is from the incident frequency 0.38–2.31 GHz. 相似文献