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现代测量仪器的发展,对运算放大器的需求量越来越大,对运放的性能如噪声、漂移、功耗、输入阻抗、偏流等要求也越来越高,μA741、OPA111、OPA121等运放已不能适应,各种高性能的运放应运而生。本文向读者介绍一种低噪声、低漂移、低输入电流、高输入阻抗的运算放大器AD645,是741等运放的改进换代产品。本文除了着重介绍AD645,还将性能与其相近的AD545、AD546、AD548、AD549等元件向读者作比较性介绍,供读者选用。
With the development of modern measuring instruments, the demand for operational amplifiers is getting larger and larger. The requirements for operational amplifiers such as noise, drift, power dissipation, input impedance and bias current are also getting higher and higher. The μA741, OPA111, OPA121 and other operational amplifiers Has been unable to adapt, all kinds of high-performance op amp came into being. This article introduces the reader to a low noise, low drift, low input current, high input impedance operational amplifier AD645, 741 and other op amps is an improved replacement. In addition to highlighting the AD645 in this article, the AD545, AD546, AD548, AD549 and other components with similar performance will be introduced to the readers for comparison.