公开(公告)号：US4231020A

公开(公告)日：1980-10-28

申请号：US938273

申请日：1978-08-29

申请人： Daniel Azzis ,  Francois X. Delaporte

发明人： Daniel Azzis ,  Francois X. Delaporte

IPC分类号： H03M1/68 ,  H03M1/00 ,  H03K13/02

CPC分类号： H03M1/687 ,  H03M1/38

摘要： This invention relates to a digital to analog converter in general and specifically to unitary or monolithic miniature digital to analog converters designed to be fully embodied on a single one-half inch module without requiring external converter components. The digital to analog converter comprises n binary current sources and n two-way switches, n being the number of input word bits. Each switch is driven by a bit input and its function is to steer the current of the corresponding source either into a summing line for output or into a dump line. A primary feature of this converter is the separation of all individual bit converter structures comprising a current source and steering means into two different groups. In this scheme, a first group of converter structures is used to convert the high order bits and a second group of converter structures is used to convert the low order bits. This arrangement allows the provision of different types of current sources for the different converter structures depending upon the accuracy required for each current source. Control inputs are provided for acting upon the steering means to generate reference levels to which an input analog signal in an A/D converter is compared. By this technique, the D/A converters of the present invention may be utilized in A/D encoding and an improved conversion accuracy of about zero is provided.

摘要翻译： 本发明涉及一般的数模转换器，特别涉及一体式或单片式微型数/模转换器，其被设计成完全体现在单个半英寸的模块上，而不需要外部转换器部件。 数模转换器包括n个二进制电流源和n个双向开关，n是输入字位数。 每个开关由位输入驱动，其功能是将相应源的电流转换为求和线以进行输出或转储线。 该转换器的主要特征是将包括电流源和转向装置的所有单独的位转换器结构分离成两个不同的组。 在该方案中，使用第一组转换器结构来转换高阶位，并且使用第二组转换器结构来转换低阶位。 这种布置允许根据每个电流源所需的精度为不同的转换器结构提供不同类型的电流源。 控制输入​​被提供用于作用于转向装置以产生比较A / D转换器中的输入模拟信号的参考电平。 通过这种技术，本发明的D / A转换器可以用于A / D编码，并提供大约零的改进的转换精度。