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DA (Digital Analogy) conversion device

A technology for transforming devices and resistors, applied in the direction of digital-to-analog converters, etc., can solve the problem of increasing the area of ​​resistors on the chip, and achieve the effect of improving the conversion accuracy and reducing the layout area

Active Publication Date: 2010-12-08
TOYOTA JIDOSHA KK +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, when the output value is generated by resistive voltage division, in the conventional technology, in order to realize a DA conversion device with high conversion accuracy, it is necessary to increase the layout area of ​​resistors on the chip.

Method used

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  • DA (Digital Analogy) conversion device

Examples

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Embodiment Construction

[0053] Hereinafter, the configuration and functions of a high-resolution resistor string type DA conversion device as an embodiment of the DA conversion device according to the present invention will be described. The high-resolution resistor string type DA conversion device is a circuit characterized by improved INL (integral nonlinearity) and DNL (differential nonlinearity), and is formed on an IC chip. Specifically, the DA conversion device includes a first resistor string corresponding to the highest bit (MSB), a second resistor string corresponding to the lowest bit (LSB), and a plurality of resistor strings connecting the second resistor string and the first resistor string. Switch, a logic circuit that controls ON / OFF of multiple switches.

[0054] The first resistor string is composed of resistors with lower sheet resistance, and the second resistor string is composed of resistors with higher sheet resistance than the sheet resistance of the first resistor array. In o...

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Abstract

The invention relates to a DA (Digital Analogy) conversion device. The DA conversion device is provided with a first resistor group (R*), a second resistor group (RH*), a first switch group (SW*) and a second switch group (SWH*), reference voltages are applied to two ends of the first resistor group (R*) and the second resistor group (RH*), the first switch group (SW*) outputs the voltage to the second resistor group (RH*) from the node (N*) in the first resistor group, wherein the voltage is determined according to the node selected by the binary digit of the first region of an input digital value, the second switch group (SWH*) outputs the voltage determined according to the node selected by the binary digit of the second region of the input digital value from the node (NH*) in the second resistor group, and the square resistance of the second resistor group is higher than that of the first resistor group. When any one of the node among resistors in the second resistor group is selected, at least two nodes in the first resistor group are selected; and when any one of the nodes at two ends in the second resistor group is selected, one node in the first resistor group is selected. Thereby, the conversion precision of the DA conversion device can be improved and the arrangement area can be reduced.

Description

technical field [0001] The present invention relates to a resistor string type DA (digital-to-analog) conversion device in a semiconductor integrated circuit. Background technique [0002] High-resolution DA converters are widely used in integrated circuits (hereinafter referred to as ICs). In the control system, the output characteristic of the DA conversion device is required to be monotonic. That is to say, the DNL (differential nonlinearity) of the DA conversion device is required to be in the range below ±1LSB, while in many other solutions, the resistor string type is inherently monotonic. In addition, in the control of vehicles or special industrial applications, the ambient temperature of the IC with the DA conversion device can reach 150°C to 200°C. Even in such a limit state, the resistor string must ensure linearity. In addition, in IC design, the chip area of ​​the DA conversion device is required to be relatively small in terms of cost. [0003] As a resistor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/68
Inventor 安江智由王楠李琛周平
Owner TOYOTA JIDOSHA KK
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