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同步于微电子技术、微处理机技术的发展,DAS(Dorta—Acquistion System)中的新器件、新结构、新机种纷至沓来。这之中,不乏一些令人耳目一新的新名词、新概念出现。笔者不揣浅薄,采撷几枝,略作介绍,以备同仁参考。 1.PGA 由一个运算放大器和一个可用模拟开关控制的精密电阻反馈网络所构成的可编程增益放大器PGA(Programmable gain amplifiey),源从于PGA中各类传感器信号电平当量未能规一化提供而给设计者带来的窘困.这是因为,各信号电平分别用一个前置放大器除非在特定场合下成立;若共用一个固定增益放大器,则ADC输入电子会因来自传感器的信号电平的不同而有很大差异,这
Synchronously with the development of microelectronics technology and microprocessor technology, new devices, new structures and new models in the DAS (Dorta-Acquistion System) are coming in. Among these, there is no shortage of some refreshing new term, the emergence of new concepts. I do not guess shallow, pick a few sticks, a little introduction, to prepare my colleagues for reference. 1.PGA programmable gain amplifier PGA (Programmable gain amplifier) consisting of an operational amplifier and a precision resistive feedback network controlled by an analog switch, the source from the various types of sensors in the PGA signal level equivalent can not be provided This is because each signal level uses a preamplifier separately unless it is true for a particular occasion; if a fixed-gain amplifier is used in common, the ADC input electronics will vary depending on the signal level from the sensor There is a big difference between the different, this