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D/a converter

A technology of converters and conversion parts, applied in analog/digital conversion, digital-to-analog converters, instruments, etc., can solve problems such as circuit scale increase, and achieve the effect of reducing the number of resistors and reducing errors

Inactive Publication Date: 2008-04-02
SANYO ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The D / A converter of the drive circuit with such a high resolution will increase the circuit scale.

Method used

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Examples

Experimental program
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other Embodiment approach

[0037] (Structure of other embodiments)

[0038] The structure of another embodiment is shown in FIG. 3 . In this example, eight parts each are selected in the selector 12 of the resistor string 10 . That is, select the switches that are 8 points above and 8 points below the voltage point determined by the upper 8 bits, and set the selected voltages to VH and VL, respectively.

[0039] Furthermore, the 2-bit D / A converter 16 has a resistor string 22 composed of 64 resistors. In this resistor string 22 , NMOS switches 26N are connected to the lower connection points of the lower 32 resistors, and PMOS switches 26P are connected to the lower connection points of the upper 28 resistors. Furthermore, a CMOS switch 26C is connected to the lower connection points of the middle four resistors.

[0040] Here, when the 10-bit input digital data is in the range of 0 to 31, in the resistor string 10 as the switch 20L for L, the switch 20L that is 8 output points down from the correspo...

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PUM

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Abstract

A D / A convertor is provided in the present invention. By an upper m potential signal of input digital signal, selecting output from resistor string, and switching into a pair of analog signals VH and VL with lower n potential deal width. By separating the VH and VL with resistor string (22), and switching into analog signal selected according to the lower n potential signal, thereby n plus m potential input digital signals switches into analog signals, wherein both n and m are integer more than 2. It can simplify D / A convertor structure.

Description

technical field [0001] This invention relates to a D / A converter for converting an input digital signal into an analog signal. Background technique [0002] Conventionally, a D / A converter for converting a digital signal into an analog signal is known. In many cases, various signal processing is performed by digital processing, and it is widely used in drive circuits for driving loads, etc. For example, in a liquid crystal display device (LCD), a D / A converter for converting a digital video signal into an analog signal for driving a liquid crystal of each pixel is used in a driving circuit. [0003] Here, the resolution of the LCD display is getting higher and higher, and the number of bits of the video signal is also getting larger. That is, video signals of about 6 bits have been changed to 8-bit video signals, and recently 10-bit video signals have been adopted. In addition, the number of pixels also increases, and it is necessary to divide a row of pixels into a plura...

Claims

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Application Information

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IPC IPC(8): H03M1/66H03M1/68G09G3/36
CPCH03M1/765G09G3/20G09G2310/027H03M1/682H03M1/66
Inventor 松尾雄一
Owner SANYO ELECTRIC CO LTD