电路功能与优势
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title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" 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title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" 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title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器" title="稳压器">稳压器ADP2114，可提供双通道、16位、125 MSPS、1.8 V ADCAD9268 所需的各供电轨。ADP2114为AD9268供电的效率达到85%，比传统线性稳压器解决方案高出35%。
　
　　这种高效率可以降低系统级功耗，而AD9268的性能则不会下降。ADP2114是一款低噪声DC-DC稳压器，提供两个同步降压通道（2 A/2 A或3 A/1 A组合），效率最高可达95%。该器件具有300 kHz、600 kHz或1.2 MHz的可选开关频率，也可以与200 kHz至2 MHz范围内的外部频率同步。
　
　　AD9268是一款低功耗ADC，针对通信应用进行了优化，能够对最高300 MHz的模拟输入频率进行数字化处理。这款ADC的信噪比(SNR)超过78 dB，非常适合高动态范围和低功耗至关重要的通信应用。AD9268内置片内时钟分频器(1:8)，可以改善输入时钟信号的抖动性能，从而改善较高模拟输入频率时的噪声性能。可以使能AD9268的片内扰动功能，以改善积分非线性(INL)和无杂散动态范围(SFDR)性能。
　
电路描述
　　图1显示该ADP2114电源解决方案，它为AD9268 ADC提供所需的全部输入供电轨。ADP2114的输入为+3.6 V低纹波直流总线电源。ADP2114的两路输出与AD9268所需的两个电源相连，包括AVDD供电轨(+1.8 V/390 mA)和DRVDD供电轨(+1.8 V/55 mA)。ADP2114的开关频率通过与FREQ引脚相连的27 kΩ电阻设置为1.2 MHz。高开关频率允许使用较小的外部器件，从而降低该电源解决方案的整体电路板空间需求。与OPCFG引脚相连的电阻设置为4.75 kΩ时，可将ADP2114设置为双2 A强制PWM输出模式。
　
　　利用同步降压DC-DC稳压器ADP2114为双通道、16位、125 MSPS模数转换器AD9268供电，以提高效率 (CN0137)

图1. ADP2114与AD9268相连（原理示意图，未显示去耦和所有连接）

　　各输出均采用一个两级LC滤波器，第一级利用一个电感(L1/L2)，第二级则利用一个铁氧体磁珠(FB1/FB3)，反馈环路围住两级闭合。为保持稳定性，环路交越频率必须较低。稳压器之后还有一个铁氧体磁珠(FB2/FB4)，以便进一步滤波。经过此铁氧体磁珠之后，这些电压分配至PCB的电源层，其中AD9268采用局部去耦。
　
　　图2显示70 MHz模拟输入频率和125 MSPS采样时钟时AD9268的FFT。如图所示，与线性稳压器电源解决方案相比，FFT本底噪声性能没有下降，而且没有任何与开关频率相关的可测量频率成分或杂散。
　
利用同步降压DC-DC稳压器ADP2114为双通道、16位、125 MSPS模数转换器AD9268供电，以提高效率 (CN0137)

图2. 输出频谱（70 MHz AIN，–1 dBFS，采样速率 = 125 MSPS，采用ADP2114电源）

　　表1显示采用ADP1706系列线性稳压器和采用DC-DC稳压器ADP2114两种情况下，AD9268 (125 MSPS)上测得的交流性能数据。主要是10.3 MHz至200.3 MHz的各种模拟输入频率范围内的满量程信噪比(SNRFS)和无杂散动态范围(SFDR)。结果表明，采用ADP2114开关稳压器设计与采用传统LDO解决方案相比，SNR、SFDR或动态范围性能没有任何下降。　 

  　　表1. 采用ADP2106系列LDO与采用ADP2114 DC-DC稳压器时的AD9268性能对比
　
　　表2中的效率结果将LDO稳压器设计与基于ADP2114的开关稳压器设计的整体效率进行了比较。为了合理比较利用各稳压器方案的输入至输出计算得到的功率损失，本实验所用的两种评估板均采用相同的3.6 V线内或总线电压。开关稳压器(ADP2114)设计的整体效率提高了35%。对于单个AD9268，这大约节省600 mW功耗。如果系统中使用多个器件，节省的功耗将相当可观。
 

 表2. 线性与开关稳压器效率对比

　　采用ADP2114等DC-DC稳压器时，适当的布局和电路分割是确保设计成功的关键。PCB堆叠（电源层和接地层）应紧密耦合，以改善旁路。开关稳压器电感应远离ADC及ADC时钟和信号路径中的敏感器件而安装，或者安装在PCB背面，以利于消除耦合至敏感器件的磁通量。还应仔细了解电流流向，以及器件或相邻电路布局。电路之间应有良好的隔离。
　
　　欲了解设计和测试结果的更多信息，请参考Rob Reeder和Michael Cobb主持的网络研讨会高速模数转换器应用中的开关稳压器设计，以及Michael Cobb撰写的技术文章“利用开关电源为高速模数转换器供电”。
　
常见变化
　　AD9258、AD9251、AD9269、AD9231和AD9204 与AD9268尺寸兼容，在要求较低分辨率或采样速率的应用中可以代替AD9268。ADP2114的电流能力可以驱动一个以上的AD9268。如果只需要为一个器件供电，则可以考虑ADP2108。在这种情况下，只要AVDD与DRVDD供电轨之间提供适当的隔离滤波，就可以利用单个稳压器给这两个电源域供电。
　
　　若为ADC供电，低压差(LDO)稳压器与开关电路解决方案都可行。LDO电路的效率较低。开关解决方案可提高效率、降低功耗，ADC性能则不会下降。使用多个器件时，可实现更高效率，并节省更多功耗。