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高性能的增益控制电路是非常重要的.对要求不高的地方,一个集成电路运算跨导放大器就可以了,但当需要较高指标时,就必须使用复杂的分立元件电路,这就要用很多昂贵元件.本文介绍的菲立浦公司单片集成电路压缩扩张器NE570/571,是按电话系统要求最新设计的一种多功能、低成本的增益控制电路,具有失真小(<0.1%)、 信噪比高(90dB)和动态范围宽(110dB)的特点.本文重点介绍NE570/571在载波通信中作压缩扩张器应用.
High-performance gain control circuit is very important.For less demanding place, an integrated circuit transconductance amplifier can be, but when the need for higher targets, it is necessary to use complex discrete circuit components, it is necessary to use Many expensive components. This article introduces the Philippine Lipura monolithic integrated circuit compression expander NE570 / 571, according to the telephone system design of the latest design of a multi-functional, low-cost gain control circuit with a small distortion (<0.1% , High signal-to-noise ratio (90dB) and wide dynamic range (110dB) .This article focuses on the NE570 / 571 for carrier expansion in the carrier communications dilatation.