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Digital/analogue converter and method for converting digital signal to analogue signal

A technology of analog converter and analog signal, which is applied in the field of digital/analog converter and digital signal to analog signal conversion, can solve the problems of traditional digital/analog converter circuit area and cost increase, and achieve the reduction of circuit area and cost Effect

Inactive Publication Date: 2011-06-01
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the circuit area and cost of traditional digital / analog converters will be greatly increased

Method used

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  • Digital/analogue converter and method for converting digital signal to analogue signal
  • Digital/analogue converter and method for converting digital signal to analogue signal
  • Digital/analogue converter and method for converting digital signal to analogue signal

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Embodiment Construction

[0023] figure 2 A circuit diagram of a digital / analog converter (Digital-to-Analog Converter, DAC) 200 according to an embodiment of the present invention is shown. The digital / analog converter 200 is used for outputting an output analog voltage Vo according to an N-bit digital signal Sd. The digital / analog converter 200 includes a first resistor string 210 , a first selection unit 220 , a second resistor string 230 and a second selection unit 240 . N is a positive integer.

[0024] The first resistor string 210 is coupled between the power supply voltages Vr1 and Vr2 to output a first set of reference voltages A(1) to A(2) between the power supply voltages Vr1 and Vr2. M+1 ). In the embodiment of the present invention, the first resistor string 210 includes 2 M The resistors are coupled together in series. The first set of reference voltages A(1) to A(2 M+1 ) is this 2 M The node voltage between the resistors. M is a positive integer smaller than N.

[0025] The fir...

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Abstract

A digital / analogue converter is used for outputting an output analog voltage according to an N-bit digital signal. The digital / analogue converter comprises a first resistance string, a first selected element, a second resistance string and a second selected element. The first resistance string is coupled between a first power supply voltage and a second power supply voltage so as to generate a first group of voltage references between the first power supply voltage and the second power supply voltage. The first selected element selects two voltage references from the first group of voltage references according to M most significant bits of the N-bit digital signal. The second resistance string is coupled between the two selected voltage references so as to generate a second group of voltage references between the two selected voltage references. The second selected element selects one of the second groups of voltage references as an output analog voltage according to N-M least significant bits of the N-bit digital signal.

Description

technical field [0001] The invention relates to a digital / analog converter and a method for converting digital signals to analog signals, and in particular to a digital / analog converter and a method for converting digital signals to analog signals which can save circuit area. Background technique [0002] figure 1 A circuit diagram of a conventional digital-to-analog converter (Digital-to-Analog Converter, DAC) is shown. The digital / analog converter is used to convert a digital signal into an output analog voltage. exist figure 1 Among them, the conventional digital / analog converter 100 includes a resistor string 110 and a selection unit 120 . The resistor string 110 includes several resistors coupled in series. The resistor string generates a set of reference voltages between a high-level reference voltage and a low-level reference voltage. The selection unit 120 selects a reference voltage from the group of reference voltages as the output analog voltage Vo according ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/66H03M1/68H03M1/80
Inventor 王惠民张进添颜陈松李权哲
Owner HIMAX TECH LTD