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本文对一种经改进的射极反馈数据放大器的设计进行了分析和讨论。这种数据放大器具有优良的技术性能。它的输入失调电压温漂不大于0.5μV/℃,闭环增益线性不劣于±0.01％,共模抑制比可达130dB,闭环差模输入电阻不小于1000MΩ,0～2Hz的低频输入电压噪声不大于1μV(峰-峰值)。 这样的指标是通过一个结构简单的电路而取得的,整个放大器易于划分成几个相互独立的部分,因而除个别元件外,既便于单片集成,又便于分片集成组装,同时也易于用分立元件与集成运放混合组装。所有这些优点将使这种数据放大器有望成为数据采集系统中的优选电路。
In this paper, the design of an improved emitter feedback data amplifier is analyzed and discussed. This data amplifier has excellent technical performance. Its input offset voltage drift is not greater than 0.5μV / ℃, closed-loop gain linearity is not worse than ± 0.01%, common mode rejection ratio up to 130dB, closed-loop differential mode input resistance of not less than 1000MΩ, 0 ~ 2Hz low frequency input voltage noise is not Greater than 1μV (peak-to-peak). Such indicators are obtained through a simple circuit structure, the entire amplifier is easy to be divided into several independent parts, so that in addition to individual components, both for single-chip integration, but also easy to assemble and assemble the chip, but also easy to use discrete Components and integrated operational amplifier mixed assembly. All these advantages will make this kind of data amplifier hopeful as the best circuit in the data acquisition system.