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Digital-to-analog converter

A technology of digital-to-analog converter and digital input signal, which is applied in the direction of digital-to-analog converter, analog/digital conversion, code conversion, etc., which can solve the problems of circuit occupation, large area, and limitation of digital-to-analog conversion speed, etc., to save area, Improve monotonicity and increase the effect of dividing points

Inactive Publication Date: 2021-07-16
SG MICRO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The resistance ladder type digital-to-analog converter cannot guarantee the monotonicity of adjacent voltage values, so the monotonicity of the resistance ladder type digital-to-analog converter is poor
Although the resistance series digital-to-analog converter has good monotonicity, when the number of digits of the digital input signal is large, the number of switches required by the circuit is large, and the circuit will occupy a larger area. Scattering capacitance also limits the speed of digital-to-analog conversion

Method used

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Embodiment Construction

[0020] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. In the various figures, identical elements are indicated with similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale. Also, some well-known parts may not be shown in the drawings.

[0021] In the following, many specific details of the present invention, such as structures, materials, dimensions, processes and techniques of components, are described for a clearer understanding of the present invention. However, the invention may be practiced without these specific details, as will be understood by those skilled in the art.

[0022] It should be understood that in the following description, a "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical or electromagnetic connections. When an element or circuit is said to be "connected to" another element or an...

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Abstract

The invention discloses a digital-to-analog converter. The converter comprises: a first resistance network comprising an R-2R resistance ladder structure coupled between a reference voltage and a first node; a second resistance network including a resistor string structure coupled between the first node and the output port; a switching control circuit including a first switch located in a ground path of the second resistive network, and a second switch located between the first node and the output port; and a logic control circuit which is used for controlling the on / off state of the first switch and the second switch according to a digital input signal, so that an R-2R resistance ladder structure which saves more area is adopted under the condition that the resistance ladder is not sensitive to output monotonicity, and under the condition of being sensitive to output monotonicity, a resistor string structure is adopted to carry out linear voltage division so as to improve the output monotonicity.

Description

technical field [0001] The invention relates to the field of integrated circuit manufacturing, and more specifically relates to a digital-to-analog converter. Background technique [0002] With the rapid development of computer technology, multimedia technology, and signal processing technology, advanced electronic systems continue to emerge, and digital to analog converters (digital to analog converters, DACs) will be applied to the front and back ends of modern electronic systems. [0003] A digital-to-analog converter is used to convert digital signals into analog signals. Generally speaking, in integrated circuit design, DAC circuits mainly use two structures: a resistor string structure and a resistor ladder (such as R-2R). [0004] Such as figure 1 A schematic structural diagram of a conventional resistance ladder digital-to-analog converter is shown. Such as figure 1 As shown, the DAC 100 includes an R-2R resistor network 110 and a decoder circuit 120 . The R-2R r...

Claims

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Application Information

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IPC IPC(8): H03M1/66H03M1/06
CPCH03M1/662H03M1/06
Inventor 陈建春于翔其他发明人请求不公开姓名
Owner SG MICRO
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