频率转换器

The output ripple voltage of the PWM converter is±8 mV with the emblematical condition: 1.5V input voltage, 3.3V output voltage, 100mA loading current, 1MHz working frequency. It means that the whole system has high stability according with the design request.

在输入电压1.5 V，输出电压3.3 V，负载电流100 mA，工作频率1 MHz的典型条件下，对该转换器进行整体仿真，得到输出纹波电压范围仅为±8 mV，说明电路具有高稳定性，符合设计要求。

There are two types — heterodyne converters and those which use frequency multiplication principles.

共有两种转换方式，即外差转换器以及那些使用频率乘法原理的转换方式。

The time sequence was used to drive the CCD.This driving circuit of CCD was not only used by lignum automatic measurement but also by others CCD.

对于CCD输出信号，可以根据CCD像素频率和输出信号幅值来选择合适的模数转换器；而对于C

To support these clock rates, a reasonable solution is to clock the ADC and DAC at a fixed master clock rate and perform sample rate conversion completely in digital domain.

为了支援这些标准，比较合理的作法是让类比转数位和数位转类比转换器工作在固定的频率，利用数位的作法改变取样频率以支援不同的通讯协定。

Ultrasonic is a kind of mechanical wave that frequency is upper 20KHz. Ultrasonic may be generated by many ultrasonic transducers.

超声波是频率高于20KHz的机械波，它可由多种能量转换器转变而成。

This dissertation introduces the whole scheme、the hardware electro circuit design and software design, the result of experiment on salinometer is preferred at the end of the dissertation. Salinometer is base on SOPC technology, and use digital technology to design circuit: the excitation source for balance bridge is generated by digital method, its shape、amplitude and frequency can be control by digital signal, the standard branch of bridge is composed of three digital-analog-conversion, and uses the method of successive approximation to regulate the balance of bridge.

盐度计以SOPC技术为基础，通过数字化方式设计测量电路：电桥的激励源由数字化方式产生，激励源的波形、幅值和频率等可由数字量控制；平衡电桥标准支路由3个数模转换器组合实现，测量时以逐次逼近的方式调整电桥的平衡度；检测电桥平衡度的高灵敏度数字检流计同样以数字化方式设计，它的增益由程序控制，将电桥的输出电压数字化，以软件判断电桥平衡度。

The investigations of scattering characteristics about left-handed gratings in present dissertation provide important theoretical guidelines for the design of new frequency selective surfaces,couplers,filters,polarization convertors and electromagnetic absorbers for microwave and millimeter wave applications.

本文对左手介质周期结构散射特性的研究对于设计新的微波毫米波频率选择表面、耦合器、滤波器、极化转换器、电磁波吸收体等方面具有重要的理论指导价值。

For full-speed USB devices the operating frequency was low enough to allow data recovery to be handled in a vendors VHDL code, with the ASIC vendor providing only a simple level translator to meet the USB signaling requirements.

对于全速USB设备的工作频率低，足以允许数据复原转换，从而给供应商的VHDL代码处理的，通过ASIC的供应商只提供一个简单的电平转换器，以满足所需的USB信号。

Through the designed bandpass filter, it can increase the total bandwidth.Moreover, the dual-band bandpass filters are designed by using the impedance ratio of stepped impeedance resonator and meander of transmission Line.

传统上，平行耦合微带线带通滤波器，是两段四分之ㄧ波长传输线等效成一个导纳转器，因为导纳转换器并不具随频率改变的特性，此种仅适合窄频宽时较准确，用在大频宽时，实际的频宽会缩小，经由改善后，可提高频宽。

Proposed DSP engine consists of rectangular to polar converter and digital phase modulator that are designed based on the COordinate Rational DIgital Computer and Direct Digital Frequency Synthesizer algorithm respectively.

所提出来的数位讯号处理引擎包含了座标转换器和数位相位调变器，两者分别是利用数位座标旋转器以及数位频率合成器来实现。

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。。。。