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逐位比较式模数转换器具有转换速度快、精度高、动态范围大等优点,因此在数字地震仪中得以广泛应用。DFS-V 数字地震仪采用了变形双极性模数转换器,其主要电路有:①二进制变形 T 网络,它提供的一套标准电压码,高四位是双极性,低十一位是单极性的;②两个比较器,第一比较器和二采保持电路对被转换子样信号放大-0.586倍后,再与二进制变形 T 网输出的标准电压码逐位比较,由第二比较器形成位舍电平 BRL;③模数转换器标准电压源;④模数转换器的逻辑控制电路。本文最后还就模数转换器的转换精度和调校问题进行了讨论。
Bit-by-bit analog-digital converter has the advantages of fast conversion speed, high precision, large dynamic range and so on, so it is widely used in digital seismographs. DFS-V digital seismograph using a modified bipolar analog-digital converter, the main circuit are: ① Binary Transformer T network, which provides a set of standard voltage code, the upper four is bipolar, the lower eleven is Unipolar; ② two comparators, the first comparator and the second mining holding circuit to convert the sub-sample signal is amplified -0.586 times, and then with the binary distortion T standard output voltage of the standard code bit by bit by the second The comparator to form the premises level BRL; ③ analog-digital converter standard voltage source; ④ analog-digital converter logic control circuit. Finally, the paper also discusses the conversion accuracy and calibration of the ADC.