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11. 发明授权

US4590459A Analog/digital converter 失效
标题翻译：模/数转换器
公开(公告)号：US4590459A
公开(公告)日：1986-05-20
申请号：US733878
申请日：1985-05-14
申请人： Otto Lanz , Martin Maschek , Georg Mastner
发明人： Otto Lanz , Martin Maschek , Georg Mastner
IPC分类号： H03M1/18 , H03M1/00 , H03M1/48
CPC分类号： H03M1/504
摘要： A digital integrator (1) having a 16-bit output is followed by a first 12-bit digital/analog converter (2a) which is supplied with the output bits 1-11 and 16 of the integrator (1) and which forms a first tracking loop with a first subtracter (3a), which forms a first difference signal from the output signal, proportional to the input signal of the analog/digital converter, of a first amplifier (4a) and the output signal of the first digital/analog converter (2a), and a tracking circuit (6) which generates tracking signals for the integrator (1) on the basis of the difference signal. To extend the dynamic range, a second 12-bit digital/analog converter (2b) is present which is supplied with bits 5-16 from the output of the integrator and which forms a second tracking loop with a second subtractor (3b) and a second amplifier (4b), the gain factor of which is 1/16th of the gain factor of the first amplifier (4a), to which loop a control logic (15) switches over when the range which can be covered with the first digital/analog converter (2a) is exceeded. Switching back takes place at the next zero crossing, that is to say change of the most significant bit. The digital/analog converter is particularly suitable for processing the output signal of a current or voltage converter.
摘要翻译：具有16位输出的数字积分器（1）之后是第一个12位数字/模拟转换器（2a），其被提供有积分器（1）的输出位1-11和16，并且形成第一跟随第一减法器（3a）的循环，其形成与第一放大器（4a）的模拟/数字转换器的输入信号成比例的输出信号的第一差分信号和第一数字/模拟信号的输出信号转换器（2a）和跟踪电路（6），该跟踪电路（6）基于差分信号产生积分器（1）的跟踪信号。为了扩展动态范围，存在第二个12位数/模转换器（2b），其从积分器的输出端提供位5-16，并且与第二减法器（3b）形成第二跟踪环路，第二放大器（4b），其增益因子是第一放大器（4a）的增益因子的1/16，当可以覆盖第一数字/数字信号的范围时，控制逻辑（15）转换到哪个环路，模拟转换器（2a）。切换回到发生在下一个零交叉点，也就是说最高有效位的变化。数字/模拟转换器特别适用于处理电流或电压转换器的输出信号。

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