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21. 发明专利

JP3949733B2 Digital - analog converter and its method of operation 有权
公开(公告)号：JP3949733B2
公开(公告)日：2007-07-25
申请号：JP52797599
申请日：1998-09-08
申请人：コーニンクレッカフィリップスエレクトロニクスエヌヴィ
发明人：マーティンジョンエドワーズ
IPC分类号： G02F1/133 , H03M1/74 , G09G3/20 , G09G3/36 , H03M1/06 , H03M1/70 , H03M1/80
CPC分类号： G09G3/2011 , G09G3/3688 , G09G2310/027 , H03M1/0697 , H03M1/70 , H03M1/804

22. 发明专利

JP2005012750A Digital/analog conversion in extended range 审中-公开
标题翻译：数字/模拟转换在扩展范围
公开(公告)号：JP2005012750A
公开(公告)日：2005-01-13
申请号：JP2003385194
申请日：2003-11-14
申请人： Northrop Grumman Corp , ノースロップ・グラマン・コーポレーションNorthrop Grumman Corporation
发明人： ROBINSON IAN
IPC分类号： H03M1/08 , H03M1/66 , H03M1/70 , H03M3/00
CPC分类号： H03M1/70 , H03M3/51
摘要： PROBLEM TO BE SOLVED: To provide a conversion system which converts an input signal into an analog signal from a digital signal in an extended dynamic range.
SOLUTION: This system includes a DAC system and a mode selector. The mode selector selects an operation mode of a digital/analog conversion system from a plurality of modes. The mode selector selects a mode according to a characteristic of an input signal. Each mode is related to an instantaneous dynamic range of the DAC system and a quantization noise level. A mode group realizes an improvement of entire or effective dynamic range as compared with a single DAC part within the DAC system.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种将扩展动态范围内的数字信号的输入信号转换为模拟信号的转换系统。
解决方案：该系统包括DAC系统和模式选择器。模式选择器从多种模式中选择数字/模拟转换系统的操作模式。模式选择器根据输入信号的特性选择模式。每个模式与DAC系统的瞬时动态范围和量化噪声电平有关。与DAC系统中的单个DAC部分相比，模式组实现了整个或有效动态范围的改善。版权所有（C）2005，JPO＆NCIPI

23. 发明专利

JPS57123730A Da converting circuit 失效
标题翻译： DA转换电路
公开(公告)号：JPS57123730A
公开(公告)日：1982-08-02
申请号：JP835181
申请日：1981-01-22
申请人： Victor Co Of Japan Ltd
发明人： MORIYAMA MASARU
IPC分类号： H03M1/70 , H03K13/02
CPC分类号： H03M1/70
摘要： PURPOSE:To obtain a DA converting circuit with high performance at low cost, by varying the signal range of an input digital signal supplied to the DA converter on the basis of an information range signal. CONSTITUTION:While an input digital signal supplied to an input terminal 1 is shifted in a shift register SR, a signal which shows the information range of the input digital signal is obtained. Then, input information which corresponds to the information range of the input digital signal is supplied to a DA converter DAC1 and a range bit is generated on the basis of said signal showing the information range and then supplied to a DA converter DAC2, thus obtaining an external reference input signal to the DA converter DAC1 as the output of the DA converter DAC2. Therefore, polygonal expansion operation is performed easily with the simple constitution.
摘要翻译：目的：通过根据信息范围信号改变提供给DA转换器的输入数字信号的信号范围，以低成本获得具有高性能的DA转换电路。构成：提供给输入端子1的输入数字信号在移位寄存器SR中移位，得到表示输入数字信号的信息范围的信号。然后，将与输入数字信号的信息范围相对应的输入信息提供给DA转换器DAC1，并且基于表示信息范围的所述信号产生范围位，然后提供给DA转换器DAC2，从而获得作为DA转换器DAC2的输出的DA转换器DAC1的外部参考输入信号。因此，以简单的结构容易地执行多边形膨胀操作。

24. 发明专利

JPS57118433A Digital-to-analog converter 失效
标题翻译：数字到模拟转换器
公开(公告)号：JPS57118433A
公开(公告)日：1982-07-23
申请号：JP374881
申请日：1981-01-16
申请人： Matsushita Electric Ind Co Ltd
发明人： SHIRAISHI HIDEKI
IPC分类号： H03M1/80 , H03M1/70 , H03K13/02
CPC分类号： H03M1/70
摘要： PURPOSE:To set an optional voltage variable range, by connecting two operational amplifiers across a load. CONSTITUTION:When the digital input to be applied to weight resistances R1- Rn is 0, the initial voltage to be supplied to a load RL is set by a semifixed resistance VR2. In this case, the voltage to be supplied to the load RL has virtually no change although a semifixed resistance VR1 is actuated. Then the digital input of a D/A converter is set maximum to set the voltage of point B at a certain level except for 0. Thus an operational amplifier OP1 functions as a noninverse amplifier. Accordingly the output voltage of the amplifier OP1 varies by the control of the resistance VR1 to set the maximum voltage. When the digital input is set again at 0, the voltage of the point B is also set at 0 again. Thus the change of the resistance VR1 does not emerge at the output. As a result, both the initial voltage and the maximum voltage can be set simply by controlling once the resistances VR1 and VR2.
摘要翻译：目的：通过在负载上连接两个运算放大器来设置可选的电压可变范围。构成：当施加到重量电阻R1- Rn的数字输入为0时，要提供给负载RL的初始电压由半电阻VR2设定。在这种情况下，尽管半电阻VR1被致动，但要提供给负载RL的电压实际上没有变化。然后将D / A转换器的数字输入设置为最大值，将点B的电压设置在除了0以外的一定电平。因此，运算放大器OP1用作非反相放大器。因此，放大器OP1的输出电压根据电阻VR1的控制而变化，以设定最大电压。当数字输入再次设置为0时，点B的电压也再次设置为0。因此，电阻VR1的变化不会在输出端出现。结果，初始电压和最大电压都可以简单地通过控制电阻VR1和VR2来设置。

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