共查询到18条相似文献,搜索用时 62 毫秒
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通过对相位插值器电路进行建模分析,得到了相位插值器的线性度与输入信号之间相位差、输入信号上升时间和输出节点时间常数的关系.根据分析得到的结论,提出了一种新型的应用于连续数据速率时钟数据恢复电路的相位插值器,通过在相位插值器之前插入延时可控的缓冲器,使其输入信号的上升时间可以跟踪数据速率的改变,在保证线性度的同时,降低电路的噪声敏感度和功耗.芯片采用Charlerd 0.13 μm低功耗1.5/3.3 V工艺流片验证,面积为0.02 mm2,数据速率3.125 Gb/s时,功耗为8.5 mW. 相似文献
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分析了应用于时钟恢复电路中的相位插值器.为相位插值器建立了数学模型并基于模型对相位插值器在数学域进行了详细的分析.分析结果表明相位插值器输出时钟的相位和幅度强烈地依赖于插值器输入时钟间的相位差,同时提出一种新的编码方法来补偿相位的非线性.考虑到实际电路中寄生效应,文章同样在电路域中对相位插值器进行了详细分析.通过建立电路模型得到RC时间常数和输入时钟间的相差的关系,得到了它对相位插值器线性的影响.在设计中通过在PI的输入增加可控RC的输入缓冲器来调整输入时钟沿的快慢,从而降低了这种影响.最后利用分析得到的结论,使用90nm CMOS工艺设计并制造了一个相位插值器.它的供电电压为1.2V,功耗为1mw,工作范围从1GHz到5GHz.测试结果表明,输出相位单调并具有良好的线性度,验证了分析的正确性. 相似文献
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文中采用28 nm CMOS工艺,设计了一款应用于半速率CDR电路中的相位插值器。该插值器采用锁相环提供的正交参考时钟,通过编码控制的DAC电流源调整电流权重控制输出相位,一个周期内可实现128次相位插值。为了提高接收器在多通道、多协议的性能,提出了输入时钟整形电路对斜率进行调节,提高了线性度。仿真结果表明,插值器在6.25 GHz工作频率下线性度良好,微分非线性(DNL)最大不超过1 LSB,积分非线性(INL)最大不超过2 LSB,实现了高线性度、宽频率范围的设计目标。 相似文献
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分析了应用于时钟恢复电路中的相位插值器.为相位插值器建立了数学模型并基于模型对相位插值器在数学域进行了详细的分析.分析结果表明相位插值器输出时钟的相位和幅度强烈地依赖于插值器输入时钟间的相位差,同时提出一种新的编码方法来补偿相位的非线性.考虑到实际电路中寄生效应,文章同样在电路域中对相位插值器进行了详细分析.通过建立电路模型得到RC时间常数和输入时钟间的相差的关系,得到了它对相位插值器线性的影响.在设计中通过在PI的输入增加可控RC的输入缓冲器来调整输入时钟沿的快慢,从而降低了这种影响.最后利用分析得到的结论,使用90nm CMOS工艺设计并制造了一个相位插值器.它的供电电压为1.2V,功耗为1mw,工作范围从1GHz到5GHz.测试结果表明,输出相位单调并具有良好的线性度,验证了分析的正确性. 相似文献
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介绍了一种相位开关型分频器电路的噪声分析方法。这种方法基于频率综合器的频域模型,能比较准确地预测分频器的相位噪声和它对整个频率综合器相位噪声的影响。分频器电路采用0.18μm CM O S工艺设计,用于W CDM A通讯系统中。在分析过程中,针对此电路的相位开关结构,提出了一些改进其噪声性能的方法。最后用仿真结果进行分析验证,仿真结果和理论相符合。 相似文献
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A Low-Noise WLAN Mixer Using Switched Biasing Technique 总被引:1,自引:0,他引:1
Jong-Ha Kim Hee-Woo An Tae-Yeoul Yun 《Microwave and Wireless Components Letters, IEEE》2009,19(10):650-652
A low-noise CMOS down-conversion mixer for WLAN applications is presented in this letter. The proposed mixer is based on the conventional Gilbert-type topology with switched biasing technique for a current source instead of static biasing, which lowers noise over a wide range of frequencies. Moreover, a dc level shifter is used for the symmetric switching operation in tail current transistors. A current bleeding technique is adopted to reduce the noise caused by the LO switching operation. The proposed mixer was fabricated using a 0.18 mum 1P6M CMOS process. Measurement results include a conversion gain of 7.5 dB, an IIP3 of -5 dBm, and noise figures of 10.9 dB at 1 MHz and 7.6 dB at 100 MHz. The mixer core consumes a current of 4.5 mA from a supply voltage of 1.8 V. The chip size, including pads for measurements, is 0.88 times 0.88 mm2. 相似文献
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In this paper, a phase interpolator clock and data recovery (CDR) with low-voltage current mode logic (CML) latched, buffers, and muxes is presented. Because of using the CML circuits, the CDR can operate in a low supply voltage. And the original swing of the differential inputs and outputs is less than that of the CMOS logic. The power supply voltage is 1.2 V, and the static current consumption is about 20 mA. In this phase interpolator CDR, the charge pump and loop filter are replaced by a digital filter. And this structure offers the benefits of increased system stability and faster acquisition. 相似文献
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George Souliotis Costas Laoudias Fotis Plessas Nikolaos Terzopoulos 《Circuits, Systems, and Signal Processing》2016,35(2):367-383
An analog phase interpolator with improved step linearity is presented in this paper. The linearity is improved by setting the time constant of the output nodes in suitable value and by employing a fine trimming technique. The performance and the improved linearity have been verified with post-layout simulations using a well-established CMOS 65 nm technology and transistors with standard threshold voltages. The clock frequency is at 2.5 GHz and the core voltage supply at 1.2 V. Its low phase noise makes the circuit suitable for high-speed systems where low jitter performance is required. 相似文献
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A family of DC stable electronically tunable instantaneous companding integrators are presented. Based on these integrators, an electronically tunable oscillator is proposed. Since theoretically the integrators used in the proposed oscillator are inherently linear, they are capable of producing oscillating current signals with low THD levels. 相似文献
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提出了一种基于开关电容的基准电压源,其输出基准电压低于1.25 V。通过增加输出级电路,保证了连续时间内输出稳定的基准电压。采用开关电容电路消除了运放输入失调电压的不利影响。采用SMIC 0.13 μm EEPROM工艺进行了流片,电路面积为0.007 mm2。测试结果表明,该基准电压源在常温下输出的基准电压为820 mV,在1.1~1.7 V电源电压范围内的电压调整率为2.336 mV/V,在-40 ℃~80 ℃范围内的温度系数为6.75×10-5/℃。 相似文献
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基于130 nm CMOS工艺,设计了工作于K波段的双平衡下变频混频器。在传统吉尔伯特单元基础上采用电流复用注入结构,减小了开关级的偏置电流,提升了开关性能。在开关级源端引入谐振电感,消除了开关共源节点处的寄生电容,抑制了射频信号的泄露,提高了增益,减小了噪声。仿真结果表明,输入射频信号为24 GHz,本振信号为24.5 GHz,本振输入功率为-3 dBm时,该混频器的转换增益为25.8 dB,单边带噪声系数为6.4 dB,输入3阶互调截点为-8.6 dBm。 相似文献