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数据采集系统通常包括一个可编程增益放大器,来确保由模数转换器把不同幅度的信号数字化为满分辨率的信号。大的信号需要少量或无需放大,而小的信号则需要高放大倍数来减少转换器噪音的影响。两个4通道的差动多路开关(图1)就是通过选择四个差分输入通道中每一个通道所要求的不同的增益值来完成这一任务的。
Data acquisition systems typically include a programmable gain amplifier to ensure that digital signals of different amplitudes are digitized by ADCs into full-resolution signals. Large signals require little or no amplification, whereas small signals require high magnification to reduce the effects of converter noise. Two 4-channel differential multiplexers (Figure 1) accomplish this task by selecting the different gain values required for each of the four differential input channels.