MettingVanRijn A C, Peper A, Grimbergen C A
Department of Medical Physics & Informatics, University of Amsterdam, Faculty of Medicine, The Netherlands.
Med Biol Eng Comput. 1994 May;32(3):305-10. doi: 10.1007/BF02512527.
A design for an amplifier for bioelectric events is presented that has fewer parts than conventional designs. The design allows the construction of amplifiers of a high quality in terms of noise and common mode rejection, with reduced dimensions and with a lower power consumption. Gain, bandwidth and number of channels are easily adapted to a wide range of biomedical applications. An application example is given in the form of a multichannel EEG amplifier (gain is 20,000), in which each channel consists of three operational amplifiers (one single and one dual), six resistors and two capacitors. The equivalent input noise voltage and current are 0.15 microVrms and 1 pArms, respectively, in a bandwidth of 0.2-40 Hz, and a common mode rejection ratio of 136 dB is achieved without trimming.
本文提出了一种用于生物电信号的放大器设计，该设计比传统设计的部件更少。这种设计能够制造出在噪声和共模抑制方面具有高质量的放大器，尺寸更小且功耗更低。增益、带宽和通道数量能够轻松适应广泛的生物医学应用。以多通道脑电图放大器（增益为20,000）的形式给出了一个应用示例，其中每个通道由三个运算放大器（一个单运放和一个双运放）、六个电阻和两个电容组成。在0.2 - 40 Hz带宽内，等效输入噪声电压和电流分别为0.15微伏均方根值和1皮安均方根值，并且无需微调即可实现136分贝的共模抑制比。
