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为了把压缩扩展器用到移动无线系统中、以单片集成电路为目标进行研究,并使其实用化。压缩扩展器的电路形式,包括结构在内,都由计算机模拟设计,以TFG试验来确定工作状态,并作出评价。其结果,得到动态范围90dB以上、失真系数(在无调整时)0.4％以下、S/N—100dBm(3KHz带宽)的特性。另外,还具有以下特征:能进行温度补偿;采用外部调整,使失真系数达到最小;压缩器和扩展器装在同一单片上等等。在性能上也充分满足系统的要求。这一压缩扩展器对机器小型化、降低成本、提高可靠性方面作了很大贡献。本报告就压缩扩展器的组成、电路、特征和性能作一叙述。
In order to use a compact expander in a mobile wireless system, a monolithic integrated circuit is being researched and put into practical use. Compressor expansion circuit form, including the structure, including computer simulation designed to TFG test to determine the working conditions, and make comments. As a result, a dynamic range of 90 dB or more, a distortion factor (no adjustment) of 0.4% or less, and S / N-100 dBm (3 kHz bandwidth) characteristics were obtained. In addition, it has the following features: temperature compensation can be carried out; external adjustment to minimize the distortion factor; compressor and expander mounted on the same single and so on. In the performance also fully meet the system requirements. This compact expander makes a great contribution to miniaturization, cost reduction and reliability enhancement. This report describes the components, circuits, features, and performance of the Compander.