频率转换器

The transfer function of the LLC resonant converter can be obtained by using the circuit impedance, ratio of resonant inductance, and quality factor. With proper selection of the resonant tank and modulation of the operation switching frequency, the proposed circuit can achieve zero voltage switching, stabilize the output voltage, and then reduce the switching loss.

其后级之半桥LLC谐振式转换器藉由推导电路阻抗、谐振电感比例值与品质因数得到转移函数，以及利用适当的谐振电路的设计与切换频率的调变的方式达到输出电压稳定，并且令功率开关具有零电压切换之功用，以降低功率开关的切换损失。

Improvements in technologies and design make it possible to use successive approximation ADCs for video applications, where sample frequencies of at least 10MSample/s are necessary.

随著制程和设计的进步，我们能使用渐进式类比数位转换器到影像上的应用，其取样频率至少为每秒一千万次以上。

Therefore, Dr. Ciechomska and her coinvestigators wanted to see if ultrasound would accurately identify the features of nerve compression in patients with CTS. They obtained ultrasound images of 126 wrists in 52 patients who had been diagnosed as having CTS by EMG. They also obtained ultrasound images of the wrists of 22 healthy people. They used the Aspen unit (Acuson, Aliso Viejo, California), which was equipped with a linear, wideband transducer at 6 to 11 MHz.

Ciechomska和她的研究同僚于是对超音波进行研究，确定超音波是否可以正确的侦测出腕隧道症候群患者受到压迫的神经；研究人员从52位患者处获取了126个手腕超音波造影，这些患者皆经肌电图证实患有腕隧道症候群；同时，研究人员也取得了22位健康者的腕部超音波造影以为对照；所使用的仪器为Aspen (Acuson公司，位于加州Aliso Viejo市)，配备一线性的宽频电能转换器，频率设定在6到11 MHz。

Oversampling based Sigma-Delta modulation technique once had been widely used in low-speed high-resolution field, but they has excessed this limitation for high-speed device development and the strong requirements of modern wire/wireless communication.

但这种局面已经改变，一方面由于现代CMOS工艺的进步使系统工作时钟频率不断提高，另一方面受到现代通信系统巨大需求的刺激，现在Sigma-Delta模数转换器早已突破了1MHz的带宽限制，并持续往高速应用领域发展。

In this paper, we finish a pipelined adc by 4 stages, 8 bits ADC architecture with 50MHz sampling rate.

在本论文中，我们提出了一个 50 M-Samples/sec 的取样频率、8-bit 的取样位元的四段式类比数位转换器设计架构。

In this research, a 10-bit 80 MS/s pipelined ADC will be presented.

解析度10位元、取样频率80 MS/s的导管式类比数位转换器将会在此研究中实现。

A high-speed digital-to-analog converter measurement method acquires and quantizes an analog ramp output by the DAC corresponding to a digital ramp input to produce a quantized ramp, determines a start and end of the quantized ramp, obtains a difference between the quantized ramp and an ideal ramp to produce a quantized periodic signal, determines a frequency for a qualified peak from an FFT of the quantized periodic signal, produces a mask filtered periodic signal from an iFFT around the qualified peak, and determines a sample window spanning a local maximum and minimum for each period of the quantized periodic signal.

一种高速模拟数字转换器测量方法，采集和量化由DAC输出的相应于数字斜坡输入的模拟斜坡以产生量化的斜坡，确定量化的斜坡的开始和结束，获得量化的斜坡和理想的斜坡之间的差值以产生量化的周期信号，从量化的周期信号的FFT中确定合格峰值的频率，从合格峰值周围的iFFT中产生屏蔽过滤的周期信号，并且在量化的周期信号的每一周期内确定跨越局部最大值和最小值的采样窗口。

The generation methods of the special OAM are introduced, including superposing the beam lights with special phase and frequency, computer-generated hologram and mode converter.

介绍了具有轨道角动量的光束模式的生成方法：一、具有特定相位以及频率关系的光束模式的叠加；二、计算机生成的全息图；三、模式转换器。

The transfer function of the LLC resonant converter can be obtained by using the circuit impedance, ratio of resonant inductance, and quality factor.

其后级之半桥LLC谐振式转换器藉由推导电路阻抗、谐振电感比例值与品质因数得到转移函数，以及利用适当的谐振电路的设计与切换频率的调变的方式达到输出电压稳定，并且令功率开关具有零电压切换之功用，以降低功率开关的切换损失。

Only oneA/D converter is needed to complete complex quadrature translation and digital downconversion, get in-phase component and quadrature component in digital field, and also,after intra-pulse compression is done, the signal-to-noise ratio is raised, and inter-pulsecompression is done in digital field, and finally, high range resolution profile is got.Two-step stretch processing method for MMW high-resolution RADAR is presented.

计算并优化了毫米波雷达中频信号带通采样的最佳采样频率，应用现有的集成电路技术实现对中频信号的直接采样、用一个A／D转换器在数字域完成复数正交变换，在数字域完成下变频、获得同相信号和正交相信号、完成对子脉冲的脉内压缩、完成对脉内压缩信号的第二次脉间压缩，从而获得高分辨一维距离像。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。