公开(公告)号：EP1133062A3

公开(公告)日：2004-02-25

申请号：EP01105605.8

申请日：2001-03-06

申请人： NIPPON PRECISION CIRCUITS INC.

发明人： Takeda, Minoru, Nippon Precision Circuits Inc. ,  Fujiwara, Kazuyuki, Nippon Precision Circuits Inc.

IPC分类号： H03M3/04 ,  H03M1/06 ,  H03M3/02

CPC分类号： H03M3/346 ,  H03M3/502

摘要： In a delta sigma type D/A converter, in order to be capable of carrying out muting operation in steps at steps lower than 1 quantized step by digital processing, a multiplexor 2 for selectively outputting a mute code 15 for making an analog signal null and a thermometer code 14 to a local DAC4 is provided between a thermometer code converter 1 and the local DAC4, a time period of 1/M of a sampling period is made to constitute 1 cycle, at m1 (0≤m1≤M) cycle, the thermometer code 14 is made an output of the multiplexor 2 and at other m2 (m2=M-m1) cycle, the mute code 15 is made an output thereof and muting is carried out by reducing the ml cycle or muting is relieved by increasing thereof in steps at respective sampling period.

摘要翻译： 在ΔΣ型D / A转换器中，为了能够通过数字处理以低于1量化步长的步骤执行静噪操作，多路复用器2用于选择性地输出用于使模拟信号为空的静音代码15和 在温度计代码转换器1和本地DAC4之间设置温度计代码14到本地DAC4，在m1（0≤m1≤M）周期，使采样周期的1 / M的时间周期构成1个周期， 使温度计代码14成为多路复用器2的输出，在其他m2（m2 = M-m1）周期，使静音代码15作为其输出，并通过减少ml周期来实现静音，或通过增加静音 在相应的采样周期的步骤。