∑-Δ调制器分组量化编码

∑-△调制器在对变化的交流测量信号实现A／D转换处理时可以省略复杂的数字抽取滤波器、抗混叠前置滤波器和采样保持器，直接转换计算。为充分减少数据冗余，加快转换计算速度，简化电路设计，采用分组量化编码方法。用多个计数器对调制器输出的1bit码流分别连续计数，DSP对计数结果计算处理。通过分组编码，可以方便的对调制器输出数据存储、处理，根据转换精度和转换速度要求灵活的选择利用前次转换的部分相关数据，而且电路实现和控制容易。给出了原理电路和计算分析结果，具有实用价值。

Group Quantization and Coding for Sigma Delta Modulator

When Sigma Delta modulator is used to carry out A/D conversion for changing AC signal, the complex digital decimation filter, antialiasing filter and sample hold circuit can be omitted, and the calculation is made directly. In order to decrease data redundancy, speed up conversion and calculation process, and simplify the circuit design, an effective group quantization and coding approach is introduced. Several counters are used to count the output 1 bit data stream of sigma delta modulator continuously, and a DSP is used to process the counting result and obtain the results. By group quantization and coding stored and calculated easily. Moreover, according to the , the output data stream of sigma delta modulator can be demand of conversion precision and conversion speed, the related data of former conversion can be selected and used flexibly. The circuit is simple and easy to implement and control. The circuit block diagram and the calculation and analysis results are given, which can be used in practical applications.