模转换

With the development and progress of computer science,micr-electronics science and signal pro- cessing,Analog/Digital converter has already become the key technology in the area of DSP.

随着计算机技术、微电子技术以及信号处理技术的发展和进步，模数转换技术已成为数字信号处理的关键技术。

In this paper, a set of scheme to test the static and dynamic performance of A/D converters was presented.

2本文设计了一套测试模数转换器静态和动态参数的方案。

The first and the second chapters will discuss the significance of reseach, and system plan of the Marine SHARS, including the design of system function, the selection of inertial devices and design of system function, and A/D convertors and the construction of hardwares and softwares of the Marine SHARS.

第一部分讨论了舰载捷联式航向姿态基准系统的选题意义、系统总体方案的设计思想，其中包括系统功能的方案设计、惯性仪表和模/数转换电路的选择、导航计算机系统硬件和软件的方案设计等。

The multimode interference couplers are used to implement the conversion or combination of modes in integrated optical circuit.

多模波导干涉耦合器在集成光路中被用来实现波导模式的转换或合并。

Electronic current transformer ; virtual instrument ; Rogowski coil ; A/D transformation

电子式电流互感器；虚拟仪器； Rogowski线圈；模数转换

It means that it is impossible to realise efficient SHG conversion in this kind of multimode laser.

表明在无选模措施的这类内腔倍频激光器中不可能实现有效的二次非线性谐波转换。

Most electronics steelyards with 1:3,000 or 1:10,000 resolutions output to endly weigh a value and use a 12 bits~the mold of the 14 bits count the conversion machine very easily satisfy a request.

大多数电子秤是以1：3，000或1：10，000的分辨率输出最终的称重值，使用12 bit~14 bit的模数转换器很容易满足要求。

The simulation of the bandgap reference using ideal resistents shows that It's precision is 16.6 ppm.The dynamic range of the sensor is increased by 2~N using multi-sample. The FPN is cancelled using CDS. The pipeline ADC has the good tradeoffs of resolution, sample rate and area.

像素阵列的扫描方式使用多采样技术可以提高传感器动态范围2~N倍，相关二次采样技术消除了像素单元之间的固定模式噪声，使用流水线式的模数转换器可以实现好的分辨率、速度和面积等的折衷。

Chapter 3: introduces the design and realization of one part of PAMS, the PCI Communication Board, together with a brief description on PCI bus design principles.

第4章，介绍了系统组成模块&基于DAC的高谱纯度低频差分信号源&的设计与实现，讨论了Σ-Δ模-数转换器的原理和特点，并对信号源的补偿方法作了介绍。

Based on the principle of Hamilton, dividing the main blade, flexbeam and torque tube into several beam elements, the bearingless rotor is nonlinearly modeled in this paper through modal transformation. By Newton-Raphson iteration and temporal finite element method, the above nonlinear equations are solved.

将无轴承旋翼的主桨叶、柔性梁和套管3个部分各自离散成若干梁单元，并将桨叶运动的物理坐标转换为挥舞、摆振、扭转方向的模态坐标，根据Hamilton原理建立旋翼气弹分析的动力学模型。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。