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公开(公告)号：DE2720653A1
公开(公告)日：1977-12-01
申请号：DE2720653
申请日：1977-05-07
Applicant: IBM
Inventor： DELAPORTE FRANCOIS XAVIER , HORNUNG ROBERT MICHAEL , LAMOUROUX ANNE-MARIE , LEBESNERAIS GERARD MAXIME , NUEZ JEAN-PAUL JULES
IPC: H01L27/04 , H01L21/326 , H01L21/822 , H01L27/08 , H01L29/8605 , H01L23/56
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公开(公告)号：AU3857078A
公开(公告)日：1980-02-07
申请号：AU3857078
申请日：1978-08-02
Applicant: IBM
Inventor： AZZIS DANIEL , DELAPORTE FRANCOIS XAVIER
Abstract: 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.
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3.发明专利
公开(公告)号：DE3065192D1
公开(公告)日：1983-11-10
申请号：DE3065192
申请日：1980-10-29
Applicant: IBM
IPC: H03K5/02 , H03K17/082 , H03K19/018 , H03K19/00 , H03K17/08
Abstract: An interface circuit for exchanging digital signals between two pieces of data processing equipment is provided in integrated form in accordance with international standards, such as EIA Standards. This is achieved through modification of an operational amplifier to adapt its use to the conditions and requirements of interface circuits.
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公开(公告)号：DE2837730A1
公开(公告)日：1979-04-05
申请号：DE2837730
申请日：1978-08-30
Applicant: IBM
Inventor： AZZIS DANIEL , DELAPORTE FRANCOIS XAVIER
Abstract: 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.
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