Self-adjusting bipolar voltage source digital-to-analog converter

A digital-to-analog converter and bipolar technology, which is applied in the field of self-adjusting bipolar voltage source digital-to-analog converters, can solve the problems of digital-to-analog conversion circuit errors and the difficulty of matching two reference voltage sources.

Inactive Publication Date: 2011-08-03
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practice, it is difficult for the two reference voltage sources 16 and 17 to match
When it does not match, the digital-to-analog conversion circuit produces an error

Method used

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  • Self-adjusting bipolar voltage source digital-to-analog converter
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  • Self-adjusting bipolar voltage source digital-to-analog converter

Examples

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Effect test

Embodiment 1

[0019] Example as image 3 As shown, the figure shows a self-adjusting bipolar voltage source DAC13. The DAC 13 includes a resistor string 11 , a switch array 12 , and a reference voltage source 10 , a buffer 20 and an operational amplifier 19 . The resistor string 11 is composed of resistors R0-R7 connected in series, and each resistor has the same resistance value. The reference voltage source 10 generates a reference voltage Vref through the buffer 20 and is connected to the highest node n8 of the resistor string 11 . The inverting input terminal of the operational amplifier 19 is connected to the middle node n4 of the resistor string 11, the non-inverting input terminal is AC grounded, and the output terminal is connected to the lowest node n0 of the resistor string 11, then the bottom end of the resistor string 11 automatically generates a voltage -Vref. The switch array 12 transmits the node voltage selected in n0-n7 to Vout, and the input digital signal Determines w...

Embodiment 2

[0020] Example two such as Figure 4 As shown, the figure shows a self-adjusting bipolar voltage source DAC25. The DAC25 includes a high voltage dividing resistor string 21 , a low voltage dividing resistor string 22 , switch arrays MUX1 and MUX2 , buffers 23 and 24 , a reference voltage source 26 , a buffer 27 and an operational amplifier 33 . The resistor string 21 is composed of resistors CR0-CR7 connected in series, and each resistor has the same resistance value. The resistor string 22 is composed of resistors FR0-FR7 connected in series, and each resistor has the same resistance value. However, the resistors CR0-CR7 and FR0-FR7 do not need to have the same resistance value. The reference voltage source 26 generates a reference voltage Vref through the buffer 27 and is connected to the highest node n8 of the resistor string 21 . The inverting input terminal of the operational amplifier 33 is connected to the middle node n4 of the high-order voltage dividing resistor st...

Embodiment 3

[0021] Embodiment three such as Figure 5 As shown, the figure shows a self-adjusting bipolar voltage source DAC45. The DAC45 includes a high voltage dividing resistor string 41 , a low voltage dividing resistor string 42 , switch arrays MUX3 and MUX4 , current sources 43 and 44 , a reference voltage source 46 , a buffer 47 and an operational amplifier 53 . The resistor string 41 is composed of resistors RC0-RC7 connected in series, and each resistor has the same resistance value. The resistor string 42 is composed of resistors RF0-RF7 connected in series, and each resistor has the same resistance value. However, the resistors RC0-RC7 and RF0-RF7 do not need to have the same resistance value. The currents of the current sources 43 and 44 are equal, and this current makes the voltage at both ends of the low-order voltage-dividing resistor string 42 equal to the voltage at both ends of each resistor of the high-order voltage-dividing resistor string 41 . The reference voltage...

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PUM

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Abstract

The invention discloses a self-adjusting bipolar voltage source digital-to-analog converter. The self-adjusting bipolar voltage source digital-to-analog converter comprises a digital-to-analog converter, a reference voltage source, an operational amplifier, a first resistor and a second resistor, wherein a reference voltage generated by the reference voltage source is connected with one end of the first resistor through a buffer; the other end of the first resistor is connected with an opposite-phase input end of the operational amplifier; the second resistor is bridged over the output end and the opposite-phase input end of the operational amplifier; the first resistor and the second resistor have the same resistance; and an alternating current of the same-phase input end of the operational amplifier is grounded; the output end of the buffer and the output end of the operational amplifier are respectively connected to the positive power supply end and the negative power supply end of the digital-to-analog converter. The self-adjusting bipolar voltage source digital-to-analog converter can generate two source digital-to-analog converter reference voltages with the same amplitude and opposite polarities by using only one reference voltage source, and has the characteristics of simple structure and high matching performance.

Description

technical field [0001] The invention relates to a digital-to-analog converter, in particular to a self-regulating bipolar voltage source digital-to-analog converter. Background technique [0002] Currently, in a bipolar digital-to-analog conversion (DAC) circuit, two reference voltages are required, one is Vref and the other is -Vref. refer to figure 1 , which shows the structure of a conventional bipolar DAC. The reference voltage source 16 generates the reference voltage Vref through the buffer 15 , and the reference voltage source 17 generates the reference voltage −Vref through the buffer 18 . Vref and -Vref act on DAC61. However, in practice, it is difficult for the two reference voltage sources 16 and 17 to match. When they do not match, the digital-to-analog conversion circuit produces an error. Contents of the invention [0003] In order to solve the above-mentioned technical problems in the prior art, the present invention provides a self-adjusting bipolar vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/66
Inventor 金湘亮安超群曾以成
Owner XIANGTAN UNIV
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