共查询到20条相似文献,搜索用时 125 毫秒
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高速CMOS全数字锁相环曾庆贵本文介绍高速CMOS全数字锁相环74I4C297它是从TTL全数字锁相环SN74LS297移植过来的,具有相同的功能和管脚排列。74HC297不但有高速CMOS数字电路的一切优点,还有下列特点:数字设计避免模拟补偿误差;... 相似文献
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一种高性能CMOS带隙电路的设计 总被引:1,自引:1,他引:0
文章提出一种CMOS带隙参考源(BGR)电路设计,它可以在很宽的电压范围内有效的工作,能够在12.8V,10V范围内实现稳定工作,抗干扰能力强,结构相对简单,由CMOS运放,二极管以及电阻组成,用常规的0.6um CMOS工艺制作,在模拟环境下仿真结果表明其最小工作电压为2.75V,完全能够满足锁相环设计的要求。 相似文献
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CMOS锁相环PLL的设计研究 总被引:6,自引:0,他引:6
在阅读大量锁相近十年发表的英文文献的基础上,对锁相环的设计及特性做了深入的分析,并对锁相环的主要部件相频检测器和压控振荡器的结构和特性做了比较和总结。 相似文献
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本文报道了一种电流模式高频CMOS锁相环,该锁相环由鉴相器、低通滤波器及电流控制高频振荡器组成。采用2μm工艺参数,用PSPICE(LEVELⅡ)进行模拟表明,该电路能在17MHz ̄50MHz的频率范围内工作。 相似文献
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A monolithic K-band phase-locked loop(PLL) for microwave radar application is proposed and implemented in this paper. By eliminating the tail transistor and using optimized high-Q LC-tank, the proposed voltage-controlled oscillator(VCO) achieves a tuning range of 18.4 to 23.3 GHz and reduced phase noise. Two cascaded current-mode logic(CML) divide-by-two frequency prescalers are implemented to bridge the frequency gap, in which inductor peaking technique is used in the first stage to further boost allowable input frequency. Six-stage TSPC divider chain is used to provide programmable division ratio from 64 to 127, and a second-order passive loop filter with 825 kHz bandwidth is also integrated on-chip to minimize required external components. The proposed PLL needs only approximately 18.2 μs settling time, and achieves a wide tuning range from 18.4 to 23.3 GHz, with a typical output power of -0.84 dBm and phase noise of 91:92 dBc/Hz@1 MHz. The chip is implemented in TSMC 65 nm CMOS process, and occupies an area of 0.56 mm2 without pads under a 1.2 V single voltage supply. 相似文献
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A new high performance charge pump circuit is designed and realized in 0.18μm CMOS process. A wide input ranged rail-to-rail operational amplifier and self-biasing cascode current mirror are used to enable the charge pump current to be well matched in a wide output voltage range.Furthermore,a method of adding a precharging current source is proposed to increase the initial charge current,which will speed up the settling time of CPPLLs.Test results show that the current mismatching can be less than 0.4%in the output voltage range of 0.4 to 1.7 V,with a charge pump current of 100μA and a precharging current of 70μA.The average power consumption of the charge pump in the locked condition is around 0.9 mW under a 1.8 V supply voltage. 相似文献
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A fully integrated phase-locked loop(PLL) is presented for a single quadrature output frequency of 3.96 GHz.The proposed PLL can be applied to mode-1 MB-OFDM UWB hopping carrier generation.An adaptive frequency calibration loop is incorporated into the PLL.The capacitance area in the loop filter is largely reduced through a capacitor multiplier.Implemented in a CMOS process, this PLL draws 13.0 mA current from a single 1.2 V supply while occupying 0.55 mm2 die area.Measurement results show that the PLL achieves a phase noise of-70 dBc/Hz at 10 kHz offset and-113 dBc/Hz at 1 MHz offset.The integrated RMS jitter from 1 kHz to 10 MHz is 2.2 ps.The reference spur level is less than-68 dBc. 相似文献
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PLL achieves a phase noise of-70 dBc/Hz at 10 kHz offset and -113 dBc/Hz at 1 MHz offset. The integrated RMS jitter from 1 kHz to 10 MHz is 2.2 ps. The reference spur level is less than -68 dBc. 相似文献
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锁相环在很多领域都得到了广泛应用。本文给出了一款全芯片集成锁相环电路设计,其工作输出频率范围在50M到150M之间,抖动在150ps以内,工作电压为2.5伏,该芯片采用了0.25μmCMOS工艺。本文主要阐述全芯片集成锁相环的设计方法,以及对各个参数的折衷设计考虑,最后给出了一些仿真结果和电路物理版图。 相似文献
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本文设计了基于电荷泵架构锁相环电路的两个关键模块—鉴频鉴相器和改进型电流引导电荷泵。基于对扩展鉴相范围和消除死区方法的研究,鉴频鉴相器的性能得以优化。同时,为了保证电荷泵在一个宽输出电压范围内获得良好的电流匹配和较小的电流变化,许多额外的子电路被应用在电路设计中来改进电荷泵的架构。电路采用了标准90 nm CMOS 工艺设计实现并进行测试。鉴频鉴相器鉴相范围的测试结果为-354~354度,改进型电荷泵在0.2~1.1 V的输出电压范围内的电流失配比小于1.1%,泵电流变化小于4%。电路在1.2 V供电电压下的动态功耗为1.3mW。 相似文献
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采用动态鉴频鉴相器、基于常数跨导轨到轨运算放大器的电荷泵、差分型环形压控振荡器,设计了一种低抖动的电荷泵锁相环。基于SMIC 0.18-μm CMOS工艺,利用Cadence软件完成了电路的设计与仿真。结果表明,动态的鉴频鉴相器,有效消除了死区。新型的电荷泵结构,在输出电压为0.5 V~1.5 V时将电流失配减小到了2%以下。压控振荡器在频率为1 MHz时输出的相位噪声为-94.87 dB在1 MHz,调谐范围为0.8 GHz~1.8 GHz。锁相环锁定后输出电压波动为2.45 mV,输出时钟的峰峰值抖动为12.5 ps。 相似文献
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This paper proposes an area-saving dual-path loop filter(LPF)for low-voltage integrated phase-locked loops(PLLs).With this LPF,output current of the lowpass-path charge-pump(CP)is B times(B〉1)as great as that of the integration-path CP.By adding voltages across these two paths,the zero-capacitance is magnified B times equivalently.As a result,the chip size is greatly reduced.Based on this LPF,a 1.2 V 3.5 GHz-band PLL is fabricated in SMIC 0.18μm RFCMOS technology.Its zero-capacitance is only 1/30 of that in conventional second-order LPFs. Measured data show that,at a frequency of 3.20 GHz,phase noise is–120.2 dBc/Hz at 1 MHz offset,reference spur is–72 dBc,and power is 24 mW. 相似文献