CN102142841A - Current source switching circuit for current rudder digital/analog converter - Google Patents
Current source switching circuit for current rudder digital/analog converter Download PDFInfo
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- CN102142841A CN102142841A CN2010106024514A CN201010602451A CN102142841A CN 102142841 A CN102142841 A CN 102142841A CN 2010106024514 A CN2010106024514 A CN 2010106024514A CN 201010602451 A CN201010602451 A CN 201010602451A CN 102142841 A CN102142841 A CN 102142841A
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Abstract
The invention relates to a current source switching circuit for a current rudder digital/analog converter. The current source switching circuit comprises a current source module, a switching module and a digital control module, wherein the switching module is connected with the current source module, the switching module comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, source electrodes of the four switching tubes are connected to the current source module, grid electrodes of the fours switching tubes are respectively used for receiving a first control signal, a second control signal, a third control signal and a fourth control signal output by the digital control module, a drain electrode of the second switching tube is connected with a drain electrode of the first switching tube and outputs a first output signal, and a drain electrode of the fourth switching tube is connected with a drain electrode of the third switching tube and outputs a second output signal. In the invention, through the alternating conduction between two groups of switching tubes, the dynamic characteristic of the digital to analog converter is improved, and the high-speed and high-precision current rudder analog/digital converter is realized.
Description
Technical field
The present invention relates to integrated circuit, relate in particular to a kind of current supply switch circuit that is used for current-steering digital-to-analog converter.
Background technology
In analog integrated circuit or in interface circuit, D/A converter module is a kind of very common functional module that is used for digital signal is converted to analog signal, develop into the GHz rank especially now, precision reaches in 16bit and the above integrated circuit, and the digital to analog converter that the main at present structure that adopts all is the current steer form is realized above-mentioned functions.
In the digital to analog converter of current steer, most critical be exactly output module, it is made of current source and switch; In general, the structural representation of current supply switch circuit as shown in Figure 1, current source module 1 ' is by metal-oxide-semiconductor M1, M2 constitutes, switch module 2 ' is by switching tube SW1, SW2 constitutes, and switching tube SW1, the input signal SWD of SW2, NSWD is produced by digital control module 3 ', because switching tube SW1 in the switch module 2 ', the action of the Push And Release that SW2 is very fast, the current potential that causes switch common source A to order fluctuates as shown in Figure 2, cause output signal IOUTP and IOUTN to fluctuate, thereby cause the output harmonic wave distortion more serious, in at a high speed especially near other circuit of GHz level, situation is more serious, and this is one of main non-ideal factor of high-speed A/D converter.
In view of the foregoing, to today of high-speed, high precision direction develop rapidly, how improving the analog to digital converter dynamic characteristic is one of very crucial point at present analog to digital converter.
Summary of the invention
In order to solve the problem that above-mentioned prior art exists, the present invention aims to provide a kind of current supply switch circuit that is used for current-steering digital-to-analog converter of simple in structure and low distortion, the noise that causes owing to the very fast Push And Release of switch with compacting, thus the reasonable digital to analog converter of performance obtained.
A kind of current supply switch circuit that is used for current-steering digital-to-analog converter of the present invention, it comprises a current source module, one switch module that is connected with current source module and a digital control module, described switch module comprises first to fourth switching tube, the source electrode of described first to fourth switching tube is connected to described current source module, their grid receives first to fourth control signal of described digital control module output respectively, and the drain electrode of described second switch pipe links to each other with the drain electrode of first switching tube, and export first output signal, the drain electrode of described the 4th switching tube links to each other with the drain electrode of the 3rd switching tube, and exports second output signal.
At the above-mentioned current supply switch circuit that is used for current-steering digital-to-analog converter, described current source module comprises first metal-oxide-semiconductor and second metal-oxide-semiconductor, wherein, the source electrode of described first metal-oxide-semiconductor is connected with an external power source, its drain electrode is connected with the source electrode of described second metal-oxide-semiconductor, the drain electrode of this second metal-oxide-semiconductor is connected with the source electrode of described first to fourth switching tube, and the grid of described first metal-oxide-semiconductor and second metal-oxide-semiconductor receives outside first offset signal and second offset signal respectively.
At the above-mentioned current supply switch circuit that is used for current-steering digital-to-analog converter, described digital control module receives a digital signal and a clock signal, and exports described first to fourth control signal.
Because having adopted above-mentioned technical solution, the present invention is to reach the purpose that improves the digital to analog converter performance by number and the operating state that changes switching tube in the switch module; Specifically, the realization of circuit of the present invention is made up of at on-chip transistor preparation, digital signal process digital control module with input, promptly four control signals that produce with the interaction of clock signal are divided into two groups, control first, second switching tube and the 3rd, the 4th switching tube respectively, it is more frequent to make switching tube organize state altogether, thereby averaging of non-ideal factor, reach the purpose that reduces harmonic distortion, thereby effectively improve the performance of whole analog to digital converter.
Description of drawings
Fig. 1 is the structural representation of power switch circuit of the prior art;
Fig. 2 is the oscillogram of the input signal and the A point current potential of switch module among Fig. 1;
Fig. 3 is a kind of structural representation that is used for the current supply switch circuit of current-steering digital-to-analog converter of the present invention;
Fig. 4 is the oscillogram of the input signal and the A point current potential of switch module among Fig. 3.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are elaborated.
See also Fig. 3, Fig. 4, the present invention, promptly a kind of current supply switch circuit that is used for current-steering digital-to-analog converter, it comprises a current source module 1, a switch module 2 and a digital control module 3, wherein,
As shown in Figure 4, in the present invention, with first to fourth control signal SWD1, SWD2, NSWD 1, NSWD2 is divided into two groups, after synchronous with clock signal clk, control two groups of switching tubes respectively, promptly first, second switch pipe SW10, SW11 and the 3rd, the 4th switching tube SW20, SW21, make the alternation of every group switching tube, because every group of control signal is the relation of swinging in switching tube work, and when switching tube is idle, control signal all is height or electronegative potential so that switching tube is not worked, therefore in each group switching tube work, because switching tube constantly carries out Push And Release alternately, the current potential of ordering for A is exactly the current potential that a fluctuation is arranged always like this, but this time because the current potential of this point is in slowly changes, i.e. the amplitude of its fluctuation reduces a lot, therefore the harmonic distortion influence for the first output signal IOUTN and the second output signal IOUTP can reduce a lot, thereby reaches the purpose that improves whole performance of analog-to-digital convertor.
In sum, the present invention passes through the alternate conduction between two groups of switching tubes, thereby has improved the dynamic characteristic of analog to digital converter, has realized the current steer analog to digital converter of high-speed, high precision.Circuit of the present invention is simple, and effect is obvious, can be widely applied in the analog to digital converter, and can be operated in more than the 1GHz, and the reduced rate of harmonic distortion simultaneously can reach more than the 80dB.
Below embodiment has been described in detail the present invention in conjunction with the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not constitute limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (3)
1. current supply switch circuit that is used for current-steering digital-to-analog converter, it comprises a current source module, one switch module that is connected with current source module and a digital control module, it is characterized in that, described switch module comprises first to fourth switching tube, the source electrode of described first to fourth switching tube is connected to described current source module, their grid receives first to fourth control signal of described digital control module output respectively, and the drain electrode of described second switch pipe links to each other with the drain electrode of first switching tube, and export first output signal, the drain electrode of described the 4th switching tube links to each other with the drain electrode of the 3rd switching tube, and exports second output signal.
2. the current supply switch circuit that is used for current-steering digital-to-analog converter according to claim 1, it is characterized in that, described current source module comprises first metal-oxide-semiconductor and second metal-oxide-semiconductor, wherein, the source electrode of described first metal-oxide-semiconductor is connected with an external power source, its drain electrode is connected with the source electrode of described second metal-oxide-semiconductor, the drain electrode of this second metal-oxide-semiconductor is connected with the source electrode of described first to fourth switching tube, and the grid of described first metal-oxide-semiconductor and second metal-oxide-semiconductor receives outside first offset signal and second offset signal respectively.
3. the current supply switch circuit that is used for current-steering digital-to-analog converter according to claim 1 and 2 is characterized in that, described digital control module receives a digital signal and a clock signal, and exports described first to fourth control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106024514A CN102142841A (en) | 2010-12-23 | 2010-12-23 | Current source switching circuit for current rudder digital/analog converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106024514A CN102142841A (en) | 2010-12-23 | 2010-12-23 | Current source switching circuit for current rudder digital/analog converter |
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| CN102142841A true CN102142841A (en) | 2011-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010106024514A Pending CN102142841A (en) | 2010-12-23 | 2010-12-23 | Current source switching circuit for current rudder digital/analog converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716962A (en) * | 2014-12-31 | 2015-06-17 | 南京天易合芯电子有限公司 | Digital-analog converter unit and current steering type digital-analog converter |
| CN107147391A (en) * | 2016-03-01 | 2017-09-08 | 美国亚德诺半导体公司 | random quaternary switching |
| CN110233611A (en) * | 2019-06-18 | 2019-09-13 | 苏州兆凯电子有限公司 | A kind of cascade phase interpolation method, circuit and a kind of clock data recovery circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101588179A (en) * | 2008-05-21 | 2009-11-25 | 北京芯慧同用微电子技术有限责任公司 | Current steering digital-to-analog converter |
| CN101800531A (en) * | 2010-03-09 | 2010-08-11 | 清华大学 | Switching device and current mode digital-to-analog converter with same |
| CN201957005U (en) * | 2010-12-23 | 2011-08-31 | 上海贝岭股份有限公司 | Output circuit of digital-to-analog converter |
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2010
- 2010-12-23 CN CN2010106024514A patent/CN102142841A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101588179A (en) * | 2008-05-21 | 2009-11-25 | 北京芯慧同用微电子技术有限责任公司 | Current steering digital-to-analog converter |
| CN101800531A (en) * | 2010-03-09 | 2010-08-11 | 清华大学 | Switching device and current mode digital-to-analog converter with same |
| CN201957005U (en) * | 2010-12-23 | 2011-08-31 | 上海贝岭股份有限公司 | Output circuit of digital-to-analog converter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716962A (en) * | 2014-12-31 | 2015-06-17 | 南京天易合芯电子有限公司 | Digital-analog converter unit and current steering type digital-analog converter |
| CN107147391A (en) * | 2016-03-01 | 2017-09-08 | 美国亚德诺半导体公司 | random quaternary switching |
| CN110233611A (en) * | 2019-06-18 | 2019-09-13 | 苏州兆凯电子有限公司 | A kind of cascade phase interpolation method, circuit and a kind of clock data recovery circuit |
| CN110233611B (en) * | 2019-06-18 | 2023-02-28 | 苏州兆凯电子有限公司 | Cascade phase interpolation method and circuit and clock data recovery circuit |
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Application publication date: 20110803 |