RS-485网络设计降低功耗问题

本文主要讨论在ＲＳ－４８５网络设计中,如何在保持良好的传输特性的同时降低率损耗。     

IR与RS-232的匹配技术

现代电子设备通常包含最新的数据通信接口，以实现更高的数据率或增进用户的便利性。红外技术(IR)是数据通信接口的一个很好例子，但有时单独使用这种最新接口还是不够的，设备还需要与采用传统接口如RS-232的老设备兼容才会被用户所接受。因此，常见的红外技术和RS-232共存于同一设备中。     

用于便携无线设备的Wireless TrenchTM技术

射频电路设计人员常用的一条经验法则是:有源器件的fT至少应为工作频率的十倍时,现代无线设备中的射频电路才会具有良好的性能.     

Multiprocessor Architecture for Rapid EEG Frequency Analysis

A multicomputer array is described that speeds up the processing of spectral representation for the EEG.     

Concept and demonstration of an intermediate band tandem device for solar energy conversion

We have realized a tandem solar cell design that combines a pin‐junction with a photovoltaic intersubband absorber. This concept allows harvesting light in the visible range and the near‐ and mid‐infrared at the same time, and theoretically, energy conversion efficiencies beyond the Shockley–Queisser‐limit could be achieved. A test structure was grown, and the operation of this concept could be confirmed, in principal with an optical two‐beam experiment. The basic characteristics of the device can be explained with an equivalent circuit design that consists of three individual cells, and we find an obvious analogy to the concept of the intermediate band solar cell with noteworthy advantages at some points. Our results show, that for a working device it is crucial to adjust the properties of the photovoltaic intersubband absorber for optimal charge separating performance at the working point of the solar cell. Copyright © 2015 John Wiley & Sons, Ltd.     

单片IC实现IrDA和RS-232通信

概述 为提高数据的传输速率、方便用户操作,现代电子设备常常采用新型接口电路实现数据通信,IrDA利用无线方式进行数据通信,操作简单,是目前接口设计的优选方案之一.实际应用中,有些设备并不支持新型接口电路,需要设计方案向下兼容、支持传统的RS-232接口,这时仅采用一种接口方案无法满足系统要求,正是考虑到这一需求,现代产品往往同时支持IrDA和RS-232两种接口标准.     

Flexural wave propagation behavior of lumped mass approximations

The suitability of lumped masses for elastic wave propagation problems in beams is investigated. Dispersion relations are presented for lumped mass Euler-Bernoulli elements and an element with shear correction; for purposes of comparison, the dispersive properties of consistent masses are also given. It is shown that by increasing the rotational mass through a rotational mass factor , a good approximation can be obtained to the Timoshenko dispersion relation. Comparison with an exact solution for the propagation of a velocity discontinuity shows that the shear correction is required for a good solution and indicates optimal values for .