【摘要】 本文设计了微机控制的四通道多用途生理放大器系统，并探讨了在微机控制环境中的噪声来源及降低噪声的对策。设计的放大器的等效输入噪声峰－峰值在ＤＣ～２０ＫＨｚ的范围内小于５微伏，动态范围大于１００ｄＢ。各种参数的设置均可通过键盘选择，测量值可直接经Ａ／Ｄ转换送计算机作进一步处理。结果证明，该系统可用于测量多种不同的生理信号。更多还原

【Abstract】 A newly designed computerized 4-channel multi-purpose amplifier system for′measuring different kinds of physiological signals is described and the sources of the noises and the low-noise designing strategies for the high-gain bioamplifiers in digital environments are discussed.The R. T. I noise level (peak to peak) of the amplifier is less than 5 μv in the frequency range of DC-20KHz. The dynamic range of the amplifier is larger than 100dB. All the settings of the amplifier system can be changed easily on the computer′s monitor screen with the keyboard and the signals amplified can be digitized with a 12-bits A-to-D converter into the computer for further processing.It could be widely used in bio-signal acquisitions,clinical applications and physiology education.更多还原