论文部分内容阅读
国产SJ-41型四道生理记录仪前置放大器输出信号的极性是正负双向的,记录笔偏转±20mm时信号幅度约为±1.2V;而典型的微机数据采集系统则要求输入信号为0～+5V之间的单向信号。显然,二者之间不能直接连接,否则将造成严重失真。为此,作者设计了一个适配电路,如附图所示。由图中可以看出:±12V电源除了为各运算放大器提供工作电源之外,还径稳压管D1,D2组成的稳压器变成±10V左右的稳定电压。这两组电压分别由W_1和W_2分压,再分别径过U_1和U_2组成的电压跟随器,变成±9V的稳定电压用作四个通道的偏移电压源。图中只绘出了第一道的情况。电位器W_3分得
Domestic SJ-41-type four physiological recorder preamplifier output signal polarity is positive and negative two-way, pen ± 20mm deflection when the signal amplitude of about ± 1.2V; and typical computer data acquisition system requires the input signal is 0 ~ + 5V between the one-way signal. Obviously, the two can not be directly connected, otherwise it will cause serious distortion. To this end, the author designed a matching circuit, as shown in the figure. As can be seen from the figure: ± 12V power supply in addition to providing operational power for each op amp, but also regulator diameter regulator D1, D2 into a stable voltage ± 10V. The voltages of these two groups are divided by W_1 and W_2, respectively, and then passed through the voltage follower composed of U_1 and U_2, respectively, to become a stable voltage of ± 9V for the four-channel offset voltage source. The figure only draws the first case. Potentiometer W_3 share