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随着数字集成电路的日臻完善,A/D和D/A转换器技术已越来越广泛地应用于仪器仪表领域,使电压源、电流源、信号源等传统仪器都面临着一场变革。这种新颖仪器的构成与传统仪器结构截然不同,不仅易于智能化,而且只要集成转换器精度足够高,所组成仪器的性能也必然是很理想的。一、D/A转换器的两种基本等效电路图1(a)是一个梯型电阻网络的D/A转换器,图1(b)是其等效电路。集成电路内部包括运算放大器A的是电压输出型D/A转换器;反之是电流输出型D/A转换器。
With the improvement of digital integrated circuits, A / D and D / A converter technology has become more and more widely used in the field of instrumentation, so that traditional instruments such as voltage source, current source and signal source all face a revolution. The composition of this new instrument is very different from that of the traditional instrument. It is not only easy to be intelligent, but also must be very good as long as the accuracy of the integrated converter is high enough. First, the D / A converter two basic equivalent circuit Figure 1 (a) is a ladder resistor network D / A converter, Figure 1 (b) is its equivalent circuit. IC includes operational amplifier A is the voltage output type D / A converter; the other is the current output type D / A converter.