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2. 发明授权

US06501407B2 Digital to analog converter 失效
标题翻译：数模转换器
公开(公告)号：US06501407B2
公开(公告)日：2002-12-31
申请号：US09962652
申请日：2001-09-25
申请人： Jan Roelof Westra , Anne Johan Annema , Jeroen Michiel Van Den Boom , Eise Carel Dijkmans
发明人： Jan Roelof Westra , Anne Johan Annema , Jeroen Michiel Van Den Boom , Eise Carel Dijkmans
IPC分类号： H03M166
CPC分类号： H03M1/808
摘要： A digital to analog converter (DAC) for converting a digital signal (DS) having a maximum voltage range which corresponds to a first supply voltage (UL) into an analog signal (Uout) having a maximum voltage range which corresponds to a second supply voltage (UH). The first supply voltage (UL) is offered between a first supply terminal (VSS) and a second supply terminal (VDDL). The second supply voltage (UH) is offered between the first supply terminal (VSS) and a third supply terminal (VDDH). The digital to analog converter (DAC) comprises conversion resistors (RCNV0-RCNVn) and coupling means (CPL) for coupling a number of said conversion resistors (RCNV2-RCNVn) in between the first supply terminal (VSS) and an output terminal (OUT), and for coupling the remainder of said conversion resistors (RCNV0-RCNV1) in between the third supply terminal (VDDH) and the output terminal (OUT). The value of said number depends on the data content of the digital signal (DS). Digital to analog converters are generally implemented in ICs. For modern ICs there is a trend toward ever decreasing supply voltages. Often circuits implemented in new IC processes have to be able to interface with ICs processed in less modern processes which are generally operated on higher supply voltages. In the modern process, therefore, circuits designed in modern ICs have to cope with voltages which are above the maximum specification for their transistors or other components. The DA-converter (DAC) mentioned above fulfils this requirement by the fact that material, such as polycrystalline silicon, is used for the conversion resistors (RCNV2-RCNVn), which material can cope with relatively high voltages, and furthermore by the fact that only the coupling means (CPL) have to be designed to cope with relatively high voltages.
摘要翻译：一种用于将具有对应于第一电源电压（UL）的最大电压范围的数字信号（DS）转换为具有对应于第二电源电压的最大电压范围的模拟信号（Uout）的数模转换器（DAC）（UH）。在第一电源端子（VSS）和第二电源端子（VDDL）之间提供第一电源电压（UL）。在第一电源端子（VSS）和第三电源端子（VDDH）之间提供第二电源电压（UH）。数模转换器（DAC）包括转换电阻（RCNV0-RCNVn）和耦合装置（CPL），用于将第一电源端（VSS）和输出端（OUT）之间的多个所述转换电阻（RCNV2-RCNVn）），并且用于将第三电源端子（VDDH）和输出端子（OUT）之间的所述转换电阻器（RCNV0-RCNV1）中的其余部分耦合。所述数字的值取决于数字信号（DS）的数据内容。数字到模拟转换器通常在IC中实现。对于现代IC来说，电源电压不断下降的趋势。通常在新IC工艺中实现的电路必须能够与通常以更高电源电压工作的较不现代的工艺中处理的IC相连接。因此，在现代流程中，在现代IC中设计的电路必须处理高于其晶体管或其他部件的最大规格的电压。上述DA转换器（DAC）通过以下事实满足了这一要求：诸如多晶硅的材料用于转换电阻器（RCNV2-RCNVn），该材料可以处理相对高的电压，此外，由于只有耦合装置（CPL）必须被设计成能够处理相对较高的电压。

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