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Digital-to-analog converter

A digital-to-analog converter and inverter technology, which is applied in the field of signal processing, can solve the problems of DAC output glitches, the influence of DAC circuit output characteristics, and the unsatisfactory glitch elimination, so as to improve the output characteristics and reduce the glitch phenomenon.

Active Publication Date: 2015-12-23
INSPUR BEIJING ELECTRONICS INFORMATION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] DAC usually consists of a reference voltage setting device, an analog switch tube, a bit weight network, and an operational amplifier. Among them, the analog switch tube includes a MOS tube, and the MOS tube has a parasitic capacitance. When the dynamic change of the analog switch tube is caused by the conversion of the input signal When , the analog switching tube will release the charge, that is, the charge feedthrough effect, which will cause the DAC to produce glitches in the output, such as figure 1 As shown, the output characteristics of the DAC circuit using this analog switch tube are greatly affected
[0004] In the prior art, in order to reduce the burrs in the DAC output signal, capacitors or filter circuits are usually added to the DAC output to eliminate the burrs. The advantage of this method is that the structure is simple and there is no additional design cost, but the disadvantage is that the burrs are not eliminated enough ideal

Method used

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Examples

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Embodiment 1

[0038] Please refer to figure 2 , figure 2 A schematic structural diagram of a digital-to-analog converter provided by the present invention;

[0039] The digital-to-analog converter, including:

[0040] The reference voltage setting device 11 is used to provide the reference voltage for the bit weight network 12;

[0041] The bit weight network 12 is connected to the operational amplifier 14 through N analog switch tubes 13, and is used to generate weight currents respectively on the N branches of the bit weight network 12 according to the reference voltage, wherein N is a positive integer;

[0042]N analog switch tubes 13 are used to respectively control the conduction or shutdown between the N branches and the operational amplifier 14 according to N digital signals, wherein each analog switch tube 13 includes an analog switch tube 13 for absorbing A charge absorption module 131 for parasitic charges released during switching transitions;

[0043] It can be understood ...

Embodiment 2

[0049] Please refer to image 3 , image 3 A schematic circuit diagram of an analog switching tube provided by the present invention;

[0050] The digital-to-analog converter provided in this embodiment is based on the previous embodiment:

[0051] Preferably, the charge absorbing module 131 includes a first charge absorbing unit N5 and a second charge absorbing unit N6;

[0052] The analog switch tubes 13 also include a first inverter 132, a second inverter 133, a first switch circuit 134, and a second switch circuit 135, wherein the first charge absorbing unit N5 is located in the first switch circuit 134, and the second The second charge absorption unit N6 is located in the second switch circuit 135;

[0053] The input terminal of the first inverter 132 inputs a digital signal, and the output terminal of the first inverter 132 is connected to the input terminal of the second inverter 133;

[0054] The first switch circuit 134 also includes a first NMOS transistor N1 and...

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Abstract

The invention discloses a digital-to-analog converter, which comprises a reference voltage giving device, a bit weight network, N analog switching tubes and an operational amplifier, wherein the reference voltage giving device is used for providing a reference voltage to the bit weight network; the bit weight network is used for respectively generating weight currents on N branch circuits of the bit weight network according to the reference voltage; the N analog switching tubes are used for respectively controlling the switching on or off between the N branch circuits and the operational amplifier according to N paths of digital signals, and each analog switching tube comprises a charge absorbing module which is used for absorbing spurious charges released by the analog switching tube during switching transition; and the operational amplifier is used for summing and amplifying the weight currents of branch circuits in the N branch circuits which are accessed to the operational amplifier, and then converting the weight currents into analog currents or analog voltages. According to the digital-to-analog converter, the charge absorbing modules absorb the charges generated by the analog switching tubes, and a discharge channel is provided for the spurious charges, thereby the output of the digital-to-analog converter is not affected, the burr phenomenon at an output end of the digital-to-analog converter is effectively reduced, and the output characteristics of the digital-to-analog converter are improved.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a digital-to-analog converter. Background technique [0002] DAC (Digital to Analog Converter, digital-to-analog converter), as a device for converting digital signals into analog signals, plays a pivotal role in the field of signal transmission and processing. [0003] DAC usually consists of a reference voltage setting device, an analog switch tube, a bit weight network, and an operational amplifier. Among them, the analog switch tube includes a MOS tube, and the MOS tube has a parasitic capacitance. When the dynamic change of the analog switch tube is caused by the conversion of the input signal When , the analog switching tube will release the charge, that is, the charge feedthrough effect, which will cause the DAC to produce glitches in the output, such as figure 1 As shown, the output characteristics of the DAC circuit using this analog switch tube are greatly af...

Claims

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Application Information

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IPC IPC(8): H03M1/06H03M1/66
Inventor 王硕
Owner INSPUR BEIJING ELECTRONICS INFORMATION IND
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