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Digital-analog converter

A digital-to-analog conversion and digital-to-analog technology, applied in the field of digital-to-analog converters, can solve the problems of shrinking the chip, reducing costs, expanding the layout area, and being poor.

Active Publication Date: 2011-09-07
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the number of bits of the input word increases, the number of switching elements also increases rapidly, resulting in an enlarged layout area
This will have a bad effect on shrinking the chip and reducing the cost

Method used

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  • Digital-analog converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] Please refer to figure 2 , which shows an embodiment according to the present invention. The digital-to-analog converter 200 converts an input word into a dual output voltage V O1 and V O2 . The input word includes the least significant bit (LeastSignificant Bit, LSB) and the remaining bits. An 8-bit input word B 7 B 6 B 5 B 4 B 3 B 2 B 1 B 0 including least significant bit B 0 and the remaining bits B 7 B 6 B 5 B 4 B 3 B 2 B 1 . The digital-to-analog converter 200 includes a resistor string digital-to-analog conversion part 202 and a selection part 204 . The resistor string digital-to-analog conversion part 202 can provide the nth step voltage level and the (n+2)th step voltage level according to the remaining bits of the input word. selection section 204 provides dual output voltage V O1 and V O2 . The selection section 204 includes a first multiplexer 208 and a second multiplexer 210 . The first multiplexer 208 is coupled to the resistor str...

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PUM

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Abstract

The invention provides a digital analog converter which is used for converting input words into a dual-output voltage. The input words comprise lowest effective bits and remaining bits. The digital analog converter comprises a resistor string digital analog conversion part and a selection part; wherein, the resistor string digital analog conversion part can provide the nth stage of voltage level and the n+2 stage of voltage level according to the remaining bits; the selection part comprises a first multiplexer and a second multiplexer; the first multiplexer is coupled with the resistor stringdigital analog conversion part and provides a first output voltage according to a panel polar signal; and the second multiplexer is coupled with the resistor string digital analog conversion part andprovides a second output voltage according to the lowest effective bits of the input words. The digital analog converter further comprises an operational amplifier used for average dual-output voltage to generate analog output signals.

Description

technical field [0001] The present invention relates to a digital-to-analog converter, and more particularly to a digital-to-analog converter that uses two parts to process an input word. Background technique [0002] Currently, there are many different digital-to-analog converters (DACs) on the market, such as resistor string (R-String) digital-to-analog converters. figure 1 It is a traditional resistor string digital-to-analog converter. The resistor string DAC 100 includes a string of resistors 110 and a selector 120 . The selector 120 includes selection lines 124 , each of which includes a switching element 122 . Each switching element 122 is controlled by one bit of the input word. [0003] The resistor string is connected to a high reference voltage (V H ) with a low reference voltage (V L )between. Each select line 124 is connected to a node in the resistor string. All the switches of only one select line 124 are turned on by the input word at the same time, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/80
Inventor 王凌澐邱明正
Owner HIMAX TECH LTD