CN105049053B - Complementary current circuit, switching circuit and the current mode digital-to-analog converter of front desk correction - Google Patents
Complementary current circuit, switching circuit and the current mode digital-to-analog converter of front desk correction Download PDFInfo
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Abstract
The invention discloses complementary current circuit, switching circuit and the current mode digital-to-analog converters of a kind of front desk correction, complementary current circuit includes size of current comparator, Corrective control unit, complementary current branch and its corresponding current source to be corrected, reference current source, switch module and several control signal generation units.Wherein, size of current comparator is under the control of Corrective control unit and switch module, by reference to the size of current of two current sources in current source complementary current branch more to be corrected, comparison result is sent to Corrective control unit and further adjusts current source output electric current to be corrected.The present invention has the advantage that the correction accuracy of complementary current is high, circuit structure is simple, the speed of service is fast.
Description
Technical field
The present invention relates to the complementary current circuit of D/A converting circuit technical field more particularly to a kind of front desk correction, open
Powered-down road and current mode digital-to-analog converter.
Background technique
Digital analog converter (DAC) is as the important bridge converted between numeric field and analog domain, in signal processing and communication
Important role in field.As the raising of information content in modern communications requires digital analog converter to have higher speed.Simultaneously
Due to the multiplexing of frequency spectrum, so that simultaneous signal spectrum range is wider in single channel, to reduce signal in different frequency range
Interference, while reducing the interference of the harmonic wave of non-linear introducing, it is desirable that digital analog converter has the higher linearity.DAC's is linear
Degree generallys use spurious-free dynamic range (SFDR) to describe, and SFDR is defined as in the frequency range that output is concerned about, signal energy
With the ratio between the energy of the maximum harmonic wave of energy.Reach the hair that higher SFDR is current application field in broader frequency range
Open up one of the hot spot for the new performance requirement and ongoing research area that logarithm mode converter proposes.
In high-speed A/D converter, current mode digital-to-analog converter because its than other structures DAC speed faster, power consumption
It is low, and carrying load ability is strong, thus be widely adopted.As shown in Figure 1, being the basic structure of current mode digital-to-analog converter, include
One group of current source permutation and a pair of switches unit being connected with each current source.Input Digital Signals switch unit
On-off, thus the specific output end of the current direction for controlling each current source, the electric current from current source is in two output ends point
Addition summation is not carried out, and it is the corresponding analog output of input digital signal that difference is taken after two output ends addition summations.
In traditional current mode DAC, the principal element for influencing SFDR performance can probably be divided into following two major classes: static
Factor and dynamic factor.Wherein Static implicit method, which refers mainly to Current-source matching error, causes output end to turn in each input digital code
Change the existing error between ideal output when output is stablized.Resistance drop causes same cabling in circuit each on cabling simultaneously
The change of gradient of point voltage and the influence of temperature gradient bring can also introduce between current source reality output and ideal output
Error will introduce harmonic wave relevant to input signal in output end when input digital signal is related to these output errors
To reduce SFDR.In order to reduce Current-source matching error, simplest method is to use bigger transistor area to improve
Matching degree, but the increase of transistor area will lead to the increase of parasitic capacitance, to limit the speed of DAC.And it is simple
The area for increasing current source can not improve error brought by cabling pressure drop and temperature gradient.
It is mainly related to the digital word handoff procedure of digital analog converter for influencing the dynamic factor of SFDR.In digital word
In handoff procedure, due to time order error, power and the mismatch of switching tube of driving signal etc. can be all introduced into handoff procedure
Non-ideal output further results in the SFDR for reducing output signal to introduce burr.In addition to this, finite output impedance is
The key factor of entire DAC SFDR in high frequency is limited, as shown in Fig. 2, the increase SFDR with output impedance is improved.By
It is finite value in output impedance, and due to the influence of parasitic capacitance, leads in output impedance that there are capacitive ingredients, in high frequency
Under, output impedance further deteriorates.In order to improve output impedance, C.H-Lin et al. was in International Solid State Circuits Conference in 2009
(ISSC2009) method of increase low current branch is proposed in improve output impedance, but is limited by principle, and SFDR is mentioned
It rises limited.
Summary of the invention
The present invention is directed at least solve one of above-mentioned technical problem.
For this purpose, the first purpose of this invention is to propose a kind of complementary current circuit of front desk correction.
Second object of the present invention is to propose a kind of switching circuit of the complementary current of front desk correction.
Third object of the present invention is to propose a kind of current mode digital-to-analog converter of front desk correction.
To achieve the goals above, embodiment of the invention discloses a kind of complementary current circuits of front desk correction, comprising:
Adjustable complementary current generation module, the adjustable complementary current generation module are used to generate the first output according to current controling signal
Electric current and the second output electric current, the adjustable complementary current generation module include that the first electric current exit and the second electric current are drawn
End, the first electric current exit are connect with the first current output terminal by first switch (S3), the second electric current exit
It is connect with the second current output terminal by second switch (S4)；Size of current comparator, the size of current comparator it is just defeated
Enter end and switch (S5) by third with the second electric current exit to connect, the negative input end of the current comparator and described the
One electric current exit is connected by the 4th switch (S6) connection, the output end and Corrective control unit of the size of current comparator
It connects；Between first reference current source (I5), with third switch (S5) and the positive input terminal of the size of current comparator
Node connection；Second reference current source (I6), the negative input end with the 4th switch (S6) and the size of current comparator
Between node connection；And Corrective control unit, the Corrective control unit is according to the output of the size of current comparator
As a result the current controling signal, first switch control signal and second switch control signal are generated, wherein the first switch
Control signal is used to control the synchronous closure or openness of third switch (S5) with the 4th switch (S6), the second switch control letter
Number control first switch (S3) closure or openness synchronous with the second switch (S4).
The complementary current circuit of front desk correction according to an embodiment of the present invention, by introducing compensating current element, to realize
The correction of the error between difference and theoretical difference to the differential output current in complementary current structure, that is, remain original
Complementary current structure, while ensure that high frequency output impedance, the matching performance of current source is also improved, to improve line
Property degree.Simultaneously because the introducing of alignment technique, so that the size of current source is minimized, to reduce parasitic capacitance bring
It influences, further improves output impedance, while the speed of circuit is also promoted.
In addition, the complementary current circuit of front desk correction according to the above embodiment of the present invention, can also have following additional
Technical characteristic:
Further, the adjustable complementary current generation module includes: the first current source (I3), first current source
(I3) it is connect with the first electric current exit；Second current source (I4), second current source (I4) and second electric current
Exit connection；And subnumber mode converter, the subnumber mode converter generate feedback for receiving the current controling signal
Electric current, and the feedback current is fed back into first current source.
To achieve the goals above, embodiment of the invention discloses a kind of switch of the complementary current of front desk correction electricity
Road, the complementary current circuit of the front desk correction including preceding claim, further includes:
First current output terminal of the complementary current circuit of the first output end, first output end and the front desk correction
By the 7th switch (S7) connection, the second electric current of the complementary current circuit of first output end and the front desk correction is exported
End passes through the 8th switch (S9) connection；
First current output terminal of the complementary current circuit of second output terminal, the second output terminal and the front desk correction
By the 9th switch (S8) connection, the second electric current of the complementary current circuit of the second output terminal and the front desk correction is exported
End passes through the tenth switch (S10) connection.
The switching circuit of the complementary current of front desk correction according to an embodiment of the present invention, by the way that a pair of complementary electric current is added
Source and switch unit, so that effective output impedance is improved, parasitic capacitance bring output resistance when alleviating high frequency output
Anti- reduction.To improve the spurious-free dynamic range of output signal.Meanwhile the presence of complementary switch pair, so that switch is cut
During changing, the energy of burr obtains a degree of counteracting, thus is avoided that the dynamic error introduced during switching, from
And improve the spurious-free dynamic range of output.
To achieve the goals above, embodiment of the invention discloses a kind of current mode digital-to-analog converter of front desk correction,
It include: switching current array, each unit of the switching current array is Switched-Current Circuit, each switching current
Circuit includes: at least one current source；And the switch of at least a pair of control signal reverse phase each other, the switch connect with current source
It connects；Decoder, the decoder are used for output difference signal, the positive control signal control of the difference control signal output module
Make the 7th switch (S7) closure or openness synchronous with the tenth switch (S10), the reverse control signal of the difference controller
Control the 8th switch (S9) closure or openness synchronous with the 9th switch (S8)；Wherein, in the switching current array
At least one unit is the switching circuit of complementary current as claimed in claim 3.
The current mode digital-to-analog converter of front desk correction according to an embodiment of the present invention, the current mode digital-to-analog converter, due to
It joined the correction of current source, so that static matching performance is significantly improved.Simultaneously because using complementary electrical
Flow switching circuit as basic structural unit so that the current mode digital-to-analog converter can still be maintained in high frequency it is very good
The linearity.
In addition, the current mode digital-to-analog converter of front desk correction according to the above embodiment of the present invention, can also have as follows
Additional technical characteristic:
Further, the size of current comparator, first reference current source (I5), the second reference current source
(I6) and Corrective control unit part or all share each other.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is the structural schematic diagram of current mode digital-to-analog converter in the prior art；
Fig. 2 is the schematic diagram of relationship between the SFDR of DAC in the prior art and the output impedance of current source；
Fig. 3 is the circuit diagram of the complementary current circuit of the front desk correction of one embodiment of the invention；
Fig. 4 is the circuit diagram of the complementary current circuit of the front desk correction of one embodiment of the invention；
Fig. 5 is the circuit diagram of the complementary current switching circuit of the front desk correction of one embodiment of the invention；
Fig. 6 is the circuit diagram of the current mode digital-to-analog converter of the front desk correction of one embodiment of the invention；
Fig. 7 is a kind of showing for the current mode digital-to-analog converter for the front desk correction of one embodiment of the invention shared with module
It is intended to.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply opposite
Importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Referring to following description and drawings, it will be clear that these and other aspects of the embodiment of the present invention.In these descriptions
In attached drawing, some particular implementations in the embodiment of the present invention are specifically disclosed, to indicate to implement implementation of the invention
Some modes of the principle of example, but it is to be understood that the scope of embodiments of the invention is not limited.On the contrary, of the invention
Embodiment includes all changes, modification and the equivalent fallen within the scope of the spirit and intension of attached claims.
The principle of the present invention is introduced first, and the principle of the complementary current circuit of front desk correction is as shown in Figure 4.In correction course
In, Corrective control unit control switch S5, S6 is closed first, and S3, S4 are disconnected, and current source I3 and I4 by switch S6 and is opened at this time
It closes S5 and is connected to size of current comparator.In error free situation, have: I3-I4=I_const.That is, when error free current source I3 with
The difference of I4 is constant I_const.Before not correcting, there are error I_error for the difference:
I3-I4=I_const+I_error.
The purpose of correction module, which is that, is reduced to error I_error certain size or less.Its correction principle is as follows:
Assuming that the difference of current source I3 and I4 are there is no under error condition, current source I5 and I6 meet following relationship: I5+I4=I6+I3.
To positive (+) the end electric current of size of current comparator are as follows: I4+I5, bearing (-) end electric current is I3+I6, due to difference between I3 and I4
Error exist, the Differential input current of size of current comparator, that is, positive and negative terminal input total current difference are as follows: I3+I6- (I4+
I5)=I_error.
Size of current comparator exports corresponding control signal to Corrective control unit according to the I_error of Differential Input,
Corrective control unit controls subnumber mode converter according to the signal, makes the electric current of its output size I_adj, to make current source
The equivalent output electric current of I3 becomes: I3-I_adj, the Differential input current of size of current comparator becomes I_error2 at this time:
I3+I6- (I4+I5)-I_adj=I_error-I_adj=I_error2.
Differential input current I_error2 according to I_error the mode of action so that subnumber mode converter output electricity
Stream continues growing, and the Differential input current so as to cause size of current comparator is reduced to I_error3, so recycles, Zhi Dao electricity
The Differential input current of stream size comparator is reduced to the precision that control loop can be adjusted or less.Subnumber mode converter at this time
Export difference and theoretical value so that the electric current of difference, that is, current source I3 equivalent current and I4 of the electric current of nodes X 1 and nodes X 2
Between deviation corrected.
As shown in figure 5, in the switching circuit of the complementary current, switch S7, S10 are closed at or disconnect, and switch S8, S9 is same
When closing or opening, and the closure of S7 and S8 are opposite with the state of disconnection.When external input difference control signal, switch
The flow direction for the current source that S7, S8, S9, S10 control are connect with X3 and X4 node, thus the first output end of control and second output terminal
Between current difference it is positive and negative.
As shown in fig. 6, including switching current array and decoder in the current mode converter, and switching current array is every
Unit one includes the switch of at least one current source and at least a pair of control signal inversion.In the switching current array, at least
One unit is the complementary current switching circuit of above-mentioned front desk correction.It is poor that external digital input signal is generated by decoder
Dividing control signal, in control switch circuit to inductive switch, thus each unit output difference electricity of control switch current array
That flows is positive and negative, and the electric current of switching current array carries out cumulative summation in output end, to obtain corresponding simulation output.
Wherein, the current source front desk correction in complementary current switching circuit, corrected, output difference electric current and theory
The deviation of value is controlled within certain accuracy rating.To make the precision of entire digital analog converter be improved.
As shown in fig. 7, one group of correcting circuit module is shared in multiple complementary current sources, comprising size of current comparator and right
The reference current source answered, Corrective control unit etc..The multiple groups complementary current source of the same correcting circuit is shared, at a time,
One group of complementary current therein is only corrected, the electric current in complementary current source to be corrected is compared by switching to size of current
Two input terminals of device, continue to be corrected next circuit module after having corrected.By the correction of multiple clock cycle, from
And complete the correction in entire complementary current source.By module reuse, to reduce the area of chip, and then power consumption is saved.
The complementary current circuit of front desk correction according to an embodiment of the present invention is described below in conjunction with attached drawing.
Embodiment one:
As shown in figure 3, the complementary current circuit of the front desk correction of the present embodiment, possesses the first current output terminal and the second electricity
Output end is flowed, comprising modules include: adjustable complementary current generation module, reference current source I5 and I6, size of current comparator, school
Positive control unit and one group of switch S3, S4, S5, S6, wherein adjustable complementary current generation module, in input control signal
Under control, corresponding two groups of output electric currents are generated, one group is output to nodes X 1 from its first exit, and another group second is drawn from it
Outlet is output to nodes X 2.
One end of switch S3 is connected to nodes X 1, and the other end of S3 is connected with the first current output terminal；One end of switch S4
It is connected to nodes X 2, the other end of S4 is connected with the second current output terminal.
One end of switch S5 is connected with nodes X 2, and the other end of S5 is connected with the positive input terminal of size of current comparator；It opens
The one end for closing S6 is connected with nodes X 1, and the other end of S6 is connected with the negative input end of size of current comparator.
The one of current source I5 terminates fixed current potential five, and the other end of I5 is connected with the positive input terminal of size of current comparator；
The one of current source I6 terminates fixed current potential six, and the other end of I6 is connected with the negative input end of size of current comparator.
The function of size of current comparator is to compare the size of current of positive-negative input end and export comparison result.
Corrective control unit receives the output of size of current comparator as a result, generation size of current controls signal and output is given
Adjustable complementary current generation module, while switch control signal is generated with control switch S5 and S6, generate switch control signal two
With control switch S3 and S4.
When in correction course, switch control signal one makes the switch conduction being controlled by, switch control signal two
Disconnect the switch being controlled by, and Corrective control unit controls signal by adjusting the size of current of its output gradually to correct
The output electric current of complementary current generation module；In non-correction course, switch control signal one makes the switch being controlled by
It disconnects, switch control signal two makes the switch conduction being controlled by.
Embodiment two:
As shown in figure 4, the complementary current circuit of the front desk correction energy of the present embodiment is similar with embodiment one, difference exists
In, adjustable complementary current generation module therein is made of subnumber mode converter, current source I3 and current source I4, and:
One end of current source I3 and I4 connect fixed current potential three and fixed current potential four respectively, and the other end of I3 and I4 are respectively and mutually
The first exit and the second exit for mending electric current generation module are connected.
Subnumber mode converter receives the input control signal of adjustable complementary current generation module, generates corresponding electric current and defeated
The first exit of adjustable complementary current generation module is arrived out.To realize the correction of complementary current unit differential output current.
The complementary current switching circuit of front desk correction according to an embodiment of the present invention is described below in conjunction with attached drawing.
As shown in figure 5, the complementary current switching circuit with calibration function of the present embodiment, input is one group of difference control
Signal, exports the two-way current signal for the first output end and second output terminal, internal circuit blocks include one group of switch S7,
Complementary current circuit module with calibration function described in S8, S9, S10 and embodiment two, in which:
The first current output terminal and the second current output terminal of the complementary current circuit module are respectively connected to circuit node
X3 and X4；One end of switch S7 and S8 are connected to nodes X 3, and the other end is connected respectively to the switching circuit of the complementary current
First output end and second output terminal；One end of switch S9 and S10 are connected to nodes X 4, and the other end is connected respectively to the complementation
The first output end and second output terminal of the switching circuit of electric current；The on-off of switch S7 and S10 are controlled letter by the input difference
The on-off of positive phase signals control in number, switch S8 and S9 is controlled the control of the inversion signal in signal by the input difference.
When external input difference control signal, switch S7, S8, S9, the current source that S10 control is connect with X3 and X4 node
Flow direction, thus control the first output end and second output terminal between current difference it is positive and negative.
Current mode digital-to-analog converter according to an embodiment of the present invention is described below in conjunction with attached drawing.
Embodiment three:
As shown in fig. 6, the current mode digital-to-analog converter of the front desk correction of the present embodiment, input includes that set of number is believed
Number, the comprising modules of the current mode digital-to-analog converter include decoder and switching current array, in which:
Each unit of switching current array is a Switched-Current Circuit, and each unit includes at least one current source
At least switch of a pair of control signal reverse phase each other；And in the switching current array, at least one unit is as implemented
The switching circuit of complementary current described in example three.
The digital input signals of the current mode digital-to-analog converter are converted into the difference control of several groups reverse phase by decoder
Signal processed, to control the Switched-Current Circuit in the switching current array.
Due to the presence of the complementary switch circuit of front desk correction, so that the deviation of the difference current of complementary current circuit output
It is corrected, to improve the precision of circuit.And then improve the SFDR of circuit.
Example IV:
As shown in fig. 7, the current mode digital-to-analog converter of the front desk correction shared with module of the present embodiment, structure and reality
Apply that example three is similar, difference place is the size of current ratio of the switching circuit of one or more complementary current with calibration function
It is shared each other compared with device, reference current I5, reference current I6 or Corrective control unit.Thus while guaranteeing calibration function,
By being multiplexed correcting circuit module, the saving of area and power consumption is realized.
In correction course, due to shared using functional module, in correction course, current source to be corrected is total
With one group of correcting circuit.
In addition, complementary current circuit, switching circuit and the current mode digital-to-analog converter of the front desk correction of the embodiment of the present invention
Other compositions and effect be all for a person skilled in the art it is known, in order to reduce redundancy, do not repeat them here.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is by claim and its equivalent limits.
Claims (5)
1. a kind of complementary current circuit of front desk correction characterized by comprising
Adjustable complementary current generation module, the adjustable complementary current generation module are used to generate first according to current controling signal
Electric current and the second output electric current are exported, the adjustable complementary current generation module includes that the first electric current exit and the second electric current draw
Outlet, the first electric current exit are connect with the first current output terminal by first switch (S3), and second electric current is drawn
End is connect with the second current output terminal by second switch (S4)；
Size of current comparator, the positive input terminal of the size of current comparator are opened with the second electric current exit by third
(S5) connection is closed, the negative input end of the current comparator is connect with the first electric current exit by the 4th switch (S6),
The output end of the size of current comparator is connect with Corrective control unit；
Between first reference current source (I5), with third switch (S5) and the positive input terminal of the size of current comparator
Node connection；
Between second reference current source (I6), with the 4th switch (S6) and the negative input end of the size of current comparator
Node connection；And
Corrective control unit, the Corrective control unit generate the electric current according to the output result of the size of current comparator
It controls signal, first switch control signal and second switch and controls signal, wherein the first switch control signal is for controlling
Third switchs the synchronous closure or openness of (S5) with the 4th switch (S6), and the second switch control signal control described first is opened
Close (S3) closure or openness synchronous with the second switch (S4).
2. the complementary current circuit of front desk correction as described in claim 1, which is characterized in that the adjustable complementary current generates
Module includes:
First current source (I3), first current source (I3) connect with the first electric current exit；
Second current source (I4), second current source (I4) connect with the second electric current exit；And
Subnumber mode converter, the subnumber mode converter generate feedback current for receiving the current controling signal, and by institute
It states feedback current and feeds back to first current source.
3. a kind of switching circuit of the complementary current of front desk correction, which is characterized in that including foreground of any of claims 1 or 2
The complementary current circuit of correction, further includes:
First current output terminal of the first output end, first output end and the complementary current circuit of the front desk correction passes through
Second current output terminal of the complementary current circuit of the 7th switch (S7) connection, first output end and the front desk correction is logical
Cross the 8th switch (S9) connection；
Second output terminal, the second output terminal and the first current output terminal of the complementary current circuit of the front desk correction pass through
Second current output terminal of the complementary current circuit of the 9th switch (S8) connection, the second output terminal and the front desk correction is logical
Cross the tenth switch (S10) connection.
4. a kind of current mode digital-to-analog converter of front desk correction characterized by comprising
Each unit of switching current array, the switching current array is Switched-Current Circuit, each switching current
Circuit includes:
At least one current source；And
At least the switch of a pair of control signal reverse phase each other, the switch are connect with current source；
Decoder, the decoder are used for output difference signal, the positive control signal of the difference control signal output module
Control the 7th switch (S7) closure or openness synchronous with the tenth switch (S10), the Reverse Turning Control letter of the difference controller
Number control the 8th switch (S9) and the described 9th switchs (S8) synchronous closure or openness；
Wherein, in the switching current array at least one unit be complementary current as claimed in claim 3 switching circuit.
5. the current mode digital-to-analog converter of front desk correction according to claim 4, which is characterized in that the size of current ratio
It is compared with device, first reference current source (I5), the second reference current source (I6) and Corrective control unit part or all total each other
It enjoys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510532578.6A CN105049053B (en) | 2015-08-26 | 2015-08-26 | Complementary current circuit, switching circuit and the current mode digital-to-analog converter of front desk correction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510532578.6A CN105049053B (en) | 2015-08-26 | 2015-08-26 | Complementary current circuit, switching circuit and the current mode digital-to-analog converter of front desk correction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105049053A CN105049053A (en) | 2015-11-11 |
| CN105049053B true CN105049053B (en) | 2019-03-01 |
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| CN106483381B (en) * | 2016-10-10 | 2019-03-19 | 东南大学 | Superelevation insulation measurement instrument additive error electric current asymmetry compensation device and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355246A (en) * | 2011-05-18 | 2012-02-15 | 中国兵器工业集团第二一四研究所苏州研发中心 | High speed DAC current source switch driving circuit |
| CN102394648A (en) * | 2011-10-14 | 2012-03-28 | 清华大学 | Current-mode digital to analog converter |
| EP2579463A1 (en) * | 2011-10-03 | 2013-04-10 | Research In Motion Limited | Digital to analog converter with gradient error correction |
| CN104734720A (en) * | 2013-12-19 | 2015-06-24 | 美国亚德诺半导体公司 | Complementary switches in current switching digital to analog converters |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355246A (en) * | 2011-05-18 | 2012-02-15 | 中国兵器工业集团第二一四研究所苏州研发中心 | High speed DAC current source switch driving circuit |
| EP2579463A1 (en) * | 2011-10-03 | 2013-04-10 | Research In Motion Limited | Digital to analog converter with gradient error correction |
| CN102394648A (en) * | 2011-10-14 | 2012-03-28 | 清华大学 | Current-mode digital to analog converter |
| CN104734720A (en) * | 2013-12-19 | 2015-06-24 | 美国亚德诺半导体公司 | Complementary switches in current switching digital to analog converters |
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