CN108449089A - Realize current steering digital-to-analog converter, chip and the communication terminal of digital calibration - Google Patents
Realize current steering digital-to-analog converter, chip and the communication terminal of digital calibration Download PDFInfo
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- CN108449089A CN108449089A CN201810243147.1A CN201810243147A CN108449089A CN 108449089 A CN108449089 A CN 108449089A CN 201810243147 A CN201810243147 A CN 201810243147A CN 108449089 A CN108449089 A CN 108449089A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
- G05F3/02—Regulating voltage or current
- G05F3/08—Regulating voltage or current wherein the variable is DC
- G05F3/10—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics
- G05F3/16—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices
- G05F3/20—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
- G05F3/26—Current mirrors
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Abstract
The invention discloses a kind of current steering digital-to-analog converters for realizing digital calibration.The electric current summation that the electric current that the thermometer coding module of reception exports by turn is exported with binary coding module and reference current source circuit respectively is compared by the current steering digital-to-analog converter by current subtractor circuit, comparison result is transmitted to by comparing device in control and calibration logic, control the calibration size of current for regulating and controlling corresponding calibration current source output with calibration logic, until the calibration process for the electric current that the output of comparator is overturn, and completion exports thermometer coding module by turn.This current steering digital-to-analog converter under the premise of excessively not increasing chip area, power consumption and unitary current source size, can reduce the differential nonlinearity of the current steering digital-to-analog converter of segmentation mix type coding, improve the linearity of current steering digital-to-analog converter.
Description
Technical field
The present invention relates to a kind of current steering digital-to-analog converter more particularly to a kind of current steer types for realizing digital calibration
Digital analog converter also relates to include the IC chip of the current steering digital-to-analog converter and corresponding communication terminal,
Belong to Analogous Integrated Electronic Circuits technical field.
Background technology
Digital analog converter is the bridge for being connected to digital signal and analog signal, is widely used in digital-to-analogue mixed signal system
In.In general, realizing the conversion of digital signal and analog signal using current steering digital-to-analog converter.Current steer type digital-to-analogue conversion
Device can realize very high conversion accuracy since currents match degree is high.
As shown in Figure 1, existing current steering digital-to-analog converter is mainly gated by several current sources and several electric currents
Switch composition.For the current steering digital-to-analog converter of n (n is positive integer, similarly hereinafter) position, it is general use n current value with
The current source that binary form is encoded, these current sources are connected to by gating switch on load resistance respectively, and gating is opened
It closes in input coding b<0:N-1>Control under all current sources are summarized for two current branch of Iout+ and Iout-.This
Sample, two current branch flow to load resistance and form differential output voltage Vout+ and Vout-.But current source is adopted
For binary-coded current steering digital-to-analog converter, when highest order code value changes, all electric current gating switches
Switch simultaneously, and the mismatch of all current sources has an impact output, therefore the linearity of this digital analog converter is poor.
In order to promote the linearity of current steering digital-to-analog converter, the current source array of thermometer coding may be used.This
A coding is only had when adjacent code values convert under kind structure to change, and only there are one unit current sources to output generation shadow
It rings, therefore its differential nonlinearity (DNL) is smaller, i.e., the linearity is preferable.But it is to need largely using the cost of thermometer coding
Electric current gating switch, number of encoding bits are also higher, and it is very huge and be difficult to design that this allows for the domain under this structure.Cause
The problem of taking into account differential nonlinearity and chip area, binary coding and thermometer coding phase can be used for tradeoff design in this
In conjunction with segmentation mix coding mode, as shown in Figure 2.Current source array is divided into two groups in this structure, and one group uses two
Scale coding, another group uses thermometer coding.For a n current steering digital-to-analog converters, low p is compiled using binary system
Code, high n-p uses thermometer coding, the variance of this structure differential nonlinearity compared with pure thermometer coding structure to expand
2p+1- 1 times.Therefore, it is the current steer digital-to-analogue of reduction segmentation mix coding form after choosing fixed p value under the prior art
The differential nonlinearity of converter can only be realized by reducing the mismatch level of unit current source merely, but this will certainly increase work(
The consumption of consumption and area.
Invention content
Primary technical problem to be solved by this invention is to provide a kind of current steer type digital-to-analogue for realizing digital calibration
Converter.
Another technical problem to be solved by this invention is to provide a kind of collection including the current steering digital-to-analog converter
At circuit chip and corresponding communication terminal.
For achieving the above object, the present invention uses following technical solutions：
According to a first aspect of the embodiments of the present invention, a kind of current steer type digital-to-analogue conversion for realizing digital calibration is provided
Device, including D/A conversion unit and digital alignment unit, the D/A conversion unit includes binary coding module and thermometer
Coding module, the digital calibration unit includes current subtractor circuit, comparator, control and calibration logic, with reference to electricity
Current source circuit and multiple calibration current source circuits, the binary coding module and the thermometer coding module respectively with it is described
The input terminal of current subtractor circuit connects, the in-phase input end of the output end and the comparator of the current subtractor circuit
Connection, the output end of the comparator and the control are connect with the input terminal of calibration logic, and the control is patrolled with calibration
The output end of volume circuit input terminal, the binary coding module and the temperature with each calibration current source circuit respectively
The output end of degree meter coding module connection, each calibration current source circuit is connect with the thermometer coding module respectively,
The side in the binary coding module is arranged in the reference current source circuit；
The electric current exported the thermometer coding module of reception by turn by the current subtractor circuit respectively with
The binary coding module and the electric current summation of reference current source circuit output are compared, and comparison result passes through described
Comparator is transmitted in the control and calibration logic, described to control calibration electric current corresponding with calibration logic regulation and control
The calibration size of current of source circuit output, until the output of the comparator is overturn, completion is to the thermometer coding mould
The calibration process for the electric current that block exports by turn.
Wherein more preferably, the binary coding module includes low level current source array and the first electric current gating switch battle array
Row；The current source that the low level current source array is encoded in binary form by p current value composes in parallel, and wherein p is
Positive integer；
The first electric current gating switch array is made of multiple single-pole three-throw switches；In the low level current source array
Each current source is connected with corresponding single-pole three-throw switch, first port and the second port difference of each single-pole three-throw switch
It is correspondingly connected with the first current branch and the second current branch.
Wherein more preferably, the reference current source circuit is in parallel with the first current source of low level current source array, institute
It includes a current source and the single-pole three-throw switch that is connect with the current source to state reference current source circuit, and the single-pole three throw is opened
The first port and second port of pass are grounded respectively, the third port of the single-pole three-throw switch in align mode with the electricity
Flow subtraction circuit conducting.
Wherein more preferably, the electric current of the current source output of the reference current source circuit and the low level current source battle array
The first current source is identical in row；And the electric current of the current source output of the reference current source circuit is compiled with the binary system
The electric current of code module output forms benchmark output current, and the electric current for being exported by turn with the thermometer coding module is compared
Compared with.
Wherein more preferably, the thermometer module includes high side current source array and the second electric current gating switch array；Institute
High side current source array is stated by 2(n-p)The current source that a current value is encoded in the form of thermometer composes in parallel, and wherein n, p are equal
For positive integer；
The second electric current gating switch array is made of multiple single-pole three-throw switches；In the array of the high side current source
Each current source is connected with corresponding single-pole three-throw switch, and the first port and second port of each single-pole three-throw switch correspond to
Connect the first current branch and the second current branch.
Wherein more preferably, calibration current source in parallel is electric respectively for each current source in the array of the high side current source
Road, each calibration current source circuit includes by 2(n-p+1)The 2 of a current source and electric current gating switch composition(n-p+1)A calibration
Unit, each current source calibrated in current source circuit are connected with corresponding electric current gating switch；The calibration current source
Each electric current gating switch in circuit is connect with the control with calibration logic respectively, for passing through the control and school
The quasi- one or more electric current gating switches of logic circuit control are on or off-state, regulate and control the calibration current source
The size of the calibration electric current of circuit output, the electric current and benchmark for so that each current source in the array of the high side current source is exported
Output current is equal.
Wherein more preferably, the current subtractor circuit includes current mirroring circuit, current-voltage conversion circuit；The electricity
Current mirror circuit uses wilson current mirror or cascade type current mirror, wherein the wilson current mirror is by three NMOS crystalline substances
Body pipe forms, and the source electrode of the first NMOS transistor is connect together with the source series of the second NMOS transistor and with ground wire, institute
The grid for stating the first NMOS transistor is connect with the grid of second NMOS transistor, the grid of second NMOS transistor
With the drain electrode short circuit of second NMOS transistor, the source electrode of the drain electrode and third NMOS transistor of second NMOS transistor
Connection, the grid of the third NMOS transistor respectively with the drain electrode of first NMOS transistor and the binary coding mould
The third port of each single-pole three-throw switch in block and the reference current source circuit connects, the third NMOS transistor
Drain electrode is connect with the third port of the thermometer coding mould each single-pole three-throw switch in the block respectively；
The current-voltage conversion circuit is made of operational amplifier and resistance, and the resistance is connected on the operation and puts
Between the reverse input end and output end of big device, the positive input of the operational amplifier connects reference voltage, the operation
The drain electrode of the reverse input end connection third NMOS transistor of amplifier, the output end of the operational amplifier and the comparator
Positive input connection, the reverse input end of the comparator connects reference voltage.
Wherein more preferably, the control and calibration logic are electric with the binary coding module, the reference respectively
Current source circuit is connected with the thermometer coding mould each single-pole three-throw switch in the block, is opened for controlling each single-pole three throw
Concern shifts on different ports.
According to a second aspect of the embodiments of the present invention, a kind of IC chip, including above-mentioned current steer type number are provided
Mode converter.
According to a third aspect of the embodiments of the present invention, a kind of communication terminal is provided, including above-mentioned current steer type digital-to-analogue turns
Parallel operation.
Current steering digital-to-analog converter provided by the present invention passes through the parallel reference current source in binary coding module
Circuit, and current source circuit is calibrated in the both ends parallel connection of thermometer coding mould each current source in the block, utilize current subtractor
Circuit differentiates the mismatch condition of thermometer coding mould current source in the block by turn, and by calibrating current source circuit to each electric current
The mismatch in source is calibrated.This current steering digital-to-analog converter can not excessively increase chip area, power consumption and unitary current
Under the premise of source size, the differential nonlinearity of the current steering digital-to-analog converter of segmentation mix type coding is reduced, current steer is improved
The linearity of type digital analog converter.
Description of the drawings
Fig. 1 is in the prior art, using the structural schematic diagram of binary-coded current steering digital-to-analog converter；
Fig. 2 is the current steering digital-to-analog converter structural schematic diagram encoded using segmentation mix type in the prior art；
Fig. 3 is the circuit diagram of current steering digital-to-analog converter provided by the present invention；
Fig. 4 is to calibrate the schematic diagram of current source circuit in current steering digital-to-analog converter provided by the present invention.
Specific implementation mode
The technology contents of the present invention are described in further detail in the following with reference to the drawings and specific embodiments.
Current steering digital-to-analog converter provided by the present invention can not excessively increase chip area, power consumption and unit electricity
Under the premise of flowing source size, the linearity of the current-steering digital-to-analog converter of segmentation mix type coding is promoted.Below with n current steers
For type digital analog converter, circuit structure and operation principle to current steering digital-to-analog converter provided by the present invention carry out detailed
It describes in detail bright.
As shown in figure 3, current steering digital-to-analog converter provided by the present invention includes D/A conversion unit and digital calibration
Unit；Wherein, D/A conversion unit includes binary coding module 1 and thermometer coding module 2, and digital calibration unit includes electricity
Flow subtraction circuit 3, comparator 4, control and calibration logic 5, reference current source circuit 7 and multiple calibration current source circuits
6, binary coding module 1 and thermometer coding module 2 are connect with the input terminal of current subtractor circuit 3 respectively, current subtraction
The output end of device circuit 3 is connect with the in-phase input end of comparator 4, the output end of comparator 4 and control and calibration logic 5
Input terminal connection, control and the output end of calibration logic 5 respectively with the input terminal of each calibration current source circuit 6, two
Scale coding module 1 and thermometer coding module 2 connect, and each output end for calibrating current source circuit 6 is compiled with thermometer respectively
Code module 2 connects, and reference current source circuit 7 is arranged the side in binary coding module 1, and in binary coding module 1
First current source be connected in parallel.
In this current steering digital-to-analog converter, binary coding module 1, ginseng are controlled by control and calibration logic 5
7 output current of current source circuit is examined, and controls thermometer coding module 2 output current, current subtractor circuit 3 connects by turn successively
The electric current that shrinkage temperature meter coding module 2, binary coding module 1 and reference current source circuit 7 export, and by thermometer coding mould
The electric current summation that the electric current that block 2 exports by turn is exported with binary coding module 1 and reference current source circuit 7 respectively is compared
Compared with the comparison result being transmitted in control and calibration logic 5 by comparing device, control regulates and controls with calibration logic 5
The size of the calibration electric current of corresponding calibration current source circuit output, until the output of comparator is overturn, to completion pair
The calibration process for the electric current that thermometer coding module 2 exports by turn.Therefore, this current steering digital-to-analog converter utilizes current subtraction
Device circuit differentiates the mismatch condition of current source in thermometer coding module, and carries out school to mismatch by calibrating current source circuit
It is accurate.
As shown in figure 3, binary coding module 1 includes low level (low bit section) current source array 101 and the first electric current
Gating switch array 102；The current source I that low level current source array 101 is encoded in binary form by p current valueb1~
IbpIt composes in parallel, p is positive integer.Therefore, low level current source array can be also known as to low p current source array.Wherein, low level electricity
The size of every current source is at binary scale relationship in stream source array 101.First electric current gating switch array 102 is by multiple lists
Three throw switch S of knifeb1~SbpComposition.Each current source in low level current source array 101 and the first electric current gating switch array
Corresponding electric current gating switch connects in 102, and first of each electric current gating switch in the first electric current gating switch array 102
Port connects the first current branch Iout+, the second current branch I of second port connection of each electric current gating switchOut-。
Wherein, with the first current source I in low level current source array 101b1The reference current source circuit 7 being connected in parallel includes
One current source Ib0With with current source Ib0The electric current gating switch S being connectedb0；Current source Ib0The size of the electric current of output with
First current source I in low level current source array 101b1It is identical.Electric current gating switch also uses single-pole three-throw switch, the hilted broadsword three
The first port and second port of throw switch are grounded respectively.Reference current source circuit 7 is only in this current steering digital-to-analog converter
When in calibration mode of operation just participate in work, under non-calibrated operating mode itself and be not involved in work.Reference current source circuit 7
Effect be, when this current steering digital-to-analog converter is in calibration mode of operation, with binary coding module 1 export electric current
Benchmark output current is formed together, and the electric current for being exported by turn with thermometer coding module 2 is compared, and show that thermometer is compiled
The mismatch condition of current source in code module 2.Convenient for control with calibration logic 5 according to the corresponding calibration of comparison result control
Current source circuit calibrates the current source (mismatch of calibration current source) in thermometer coding module 2 by turn.
Thermometer coding module 2 includes high-order (high data bit section) current source array 201 and the second electric current gating switch battle array
Row 202；High side current source array 201 is by 2(n-p)The current source I that a current value is encoded in the form of thermometeru1~Iu2 (n-p)
It composes in parallel.Therefore, high side current source array can be also known as to high n-p current source array.Wherein, high side current source array
The size of every current source is identical in 201.Second electric current gating switch array 202 is by multiple single-pole three-throw switch Su1~Su2 (n-p)
Composition.Each current source electric current choosing corresponding with the second electric current gating switch array 202 in high side current source array 201
It opens up connection to connect, the first port of each electric current gating switch in the second electric current gating switch array 202 connects the first electric current
Branch Iout+, the second current branch I of second port connection of each electric current gating switchOut-.By controlling the first electric current gating
Electric current gating switch gating low level current source array 101 in switch arrays 102 and the second electric current gating switch array 202 and height
Position current source array 201 in corresponding current source, all current sources gated by electric current gating switch output current adduction after
Obtain the output current of entire D/A conversion unit.Therefore, the first current branch I can be respectively obtainedout+With the second electric current branch
Road IOut-.By the first current branch Iout+With the second current branch IOut-Respectively with a load resistance RloadConnection, by making the
One current branch Iout+With the second current branch IOut-Flow through corresponding load resistance RloadAfter form the first output voltage Vout+With
Second output voltage VOut-, first output voltage Vout+With the second output voltage VOut-Form differential output voltage.
Therefore, this current steering digital-to-analog converter is when in non-calibrated operating mode, the course of work and the prior art
In the code-shaped current-steering digital-to-analog converter of segmentation mix it is identical.Since control is gated with electric current respectively with calibration logic 5
Switch Sb0~Sbp, electric current gating switch Su1~Su2 (n-p)Connection, control export multigroup control signal with calibration logic 5, use
It is switched on required port in controlling each electric current gating switch.Therefore, the first electric current gating switch array 102 and the second electricity
Flow electric current gating switch in gating switch array 202 by control under the control of calibration logic 5 in No. 1, second end
Switch between mouthful, to form the first output voltage Vout+With the second output voltage VOut-。
In high side current source array 201, each current source calibrates current source circuit 6, each school for one in parallel respectively
Quasi- current source circuit 6 receives the control of control and calibration logic 5 respectively.As shown in figure 4, each calibrating current source circuit 6
Including by 2(n-p+1)The 2 of a current source 6011 and the composition of electric current gating switch 6012(n-p+1)A alignment unit 601, each electric current
Source 6011 is connected with corresponding electric current gating switch 6012 respectively, and 2(n-p+1)A alignment unit 601 is connected in parallel on the both ends a and b.Electric current
Single-pole single-throw switch (SPST) may be used in gating switch 6012, and each single-pole single-throw switch (SPST) with control and calibration logic 5, leads to respectively
It crosses control and sends out multigroup control signal with calibration logic 5, control one or more electric current gating switches and be on or break
Open state, within the scope of the calibration accuracy of each calibration current source circuit 6, in the ends a of each calibration current source circuit and b
Different size of calibration electric current is formed between end.By the ends a of each calibration current source circuit and the ends b, correspondence is parallel to a high position respectively
The both ends of each current source in current source array 201 are completed using obtained calibration electric current to thermometer coding module
The calibration process of each electric current of output.
Current subtractor circuit 3 includes current mirroring circuit, current-voltage conversion circuit, current mirroring circuit and electric current-electricity
Voltage conversion circuit connects.Wherein, wilson current mirror, cascade type current mirror or other similar may be used in current mirroring circuit
Structure.For example, as shown in figure 3, when current mirroring circuit 301 is using wilson current mirror circuit, the wilson current mirror is electric
It route the first NMOS transistor M1, the second NMOS transistor M2 and third NMOS transistor M3 compositions, the connection between them
Relationship description is as follows：The source electrode of first NMOS transistor M1 together with the source series of the second NMOS transistor M2 and and ground wire
Connection, the grid of the first NMOS transistor M1 are connect with the grid of the second NMOS transistor M2, the grid of the second NMOS transistor M2
The drain electrode short circuit of pole and the second NMOS transistor M2, the source electrode of the drain electrode and third NMOS transistor M3 of the second NMOS transistor M2
Connection, the grid of third NMOS transistor M3 are connect with the drain electrode of the first NMOS transistor M1, the leakage of third NMOS transistor M3
Pole is connect with current-voltage conversion circuit.From the principle of wilson current mirror：Pass through the Wilson's electric current when there is electric current
When mirror, the electric current for flowing through third NMOS transistor M3 is the mirror image for flowing through the first NMOS transistor M1 electric currents, that is to say, that is flowed through
The electric current of third NMOS transistor M3 is identical as the size for flowing through the first NMOS transistor M1 electric currents.
As shown in figure 3, current-voltage conversion circuit 302 can be made of a resistance R and an operational amplifier U,
The positive input of operational amplifier U is connect with reference voltage Vref, the reverse input end and current mirroring circuit of operational amplifier U
Connection, specifically, the reverse input end of operational amplifier U can be connect with the drain electrode of third NMOS transistor M3, operation amplifier
Series resistance R between the output end and the reverse input end of operational amplifier U of device U.Due to the reversed input in operational amplifier U
End constitutes negative voltage feedback type operational amplifier with output end series resistance R, so, according to the principle of negative-feedback, resistance R is left
The voltage value at end always with the reference voltage V of the positive input of operational amplifier UrefIt is identical, reference voltage VrefWith resistance R it
Between voltage difference be operational amplifier U output ends output voltage value.The output end of operational amplifier U also with comparator 4
Positive input connection, the inverting input of comparator 4 and reference voltage VrefConnection, the output end of comparator 4 and control with
Calibration logic 5 connects.By by electric current gating switch Sb0~SbpThird port respectively with current subtractor circuit
The drain electrode of one NMOS transistor M1 connects, electric current gating switch Su1~Su2 (n-p)Third port respectively with third NMOS transistor
The drain electrode of M3 connects, defeated to benchmark to realize according to voltage value and reference voltage level that this current adder circuit exports
The difference detection for going out electric current and the electric current of the output of thermometer coding module 2, obtains thermometer coding mould each electric current in the block
The mismatch condition in source, and the testing result (mismatch condition) can be converted to voltage and exported.
It is provided by the present invention to realize that the calibration process of the current steering digital-to-analog converter of digital calibration is：When this electric current
After rudder-type digital-to-analog converter enters calibration mode of operation, electric current gating switch is controlled by control respectively with calibration logic 5
Sb0~SbpIt is all connected to third port, the size of current for being input to the I1 accesses of current subtractor circuit 3 in this way is 2p×
Ib1；Next in the case where controlling the control with calibration logic 5, the high side current source in thermometer coding module 2 is calibrated by turn
Each current source in array 201；For example, first will be with current source Iu1The switch S being connectedu1It is connected to third port, therefore
The size of current of the I2 accesses of current subtractor circuit 3 is Iu1；The voltage that current subtractor circuit 3 exports at this time is expressed as：
Vout=Vref+(2p×Ib1-Iu1)R (1)
When 2p×Ib1More than Iu1When comparator 4 export high level, otherwise export low level；Comparator 4 is electric by the height of output
Flat or low level is input to control with calibration logic 5, passes through control and the regulation and control of calibration logic 5 and Iu1It is in parallel
The size for calibrating the calibration electric current that current source circuit 6 exports, until the output of comparator 4 is overturn, at this time in calibration accuracy
It is considered that I in rangeu1With 2p×Ib1It is equal；Later and so on, complete each electricity in thermometer coding current source array
The calibration in stream source, calibration the result is that current source Iu1~Iu2 (n-p)Size be 2p×Ib1.When binary coding current source battle array
When being listed in thermometer coding current source array carry, differential nonlinearity is also only influenced by a unit current source mismatch；
If the mismatch ratio of unit current source is k, the maximum differential of this current steering digital-to-analog converter is non-linear to be happened at two
When scale coding highest order changes, the nonlinear variance of maximum differential is (2p- 1) k2, compiled with existing segmentation mix type
The current-steering digital-to-analog converter of code is compared, and the nonlinear variance of maximum differential reduces one times.
In order to make the technical solution of current steering digital-to-analog converter provided by the present invention be more clear, below with a reality
Example is applied to be described in detail for typical case.
In this embodiment it is assumed that electricity of this current steering digital-to-analog converter using high 5 low 5 segmentation mix types codings
Flow rudder-type digital-to-analog converter；Wherein, low 5 use binary coding, and high 5 use thermometer coding.Low 5 binary codings
The total current of output is Ibx=2P-1The positive integer that × 10uA, wherein p are 1~5；Contain 32 (2 in high 5 thermometer codings5) a
Current source, Iu1~Iu32Size is disposed as 316.8uA.The electric current of reference current source circuit output is 10uA；It calibrates in current source
Containing 2 × 32-1=63 current source, the electric current of each current source output is disposed as 0.1uA, control and calibration logic
The size that the calibration electric current of current source circuit output is calibrated using 6 coding-controls, can be within the scope of 0~6.3uA with 0.1uA
Precision is adjusted.When this current steering digital-to-analog converter is in calibration mode of operation, electric current device circuit receive respectively low 5 two into
System coding with reference current source circuit output electric current composition benchmark output current, high 5 thermometer codings current source by
The electric current of position output, and be compared, which is input to control with calibration logic by comparing device, passes through control
The size of system and the calibration electric current of calibration logic control calibration current source output so that every in high 5 thermometer codings
The size of current of current source output can be adjusted within the scope of 316.8uA~323.1uA, to make high 5 thermometers compile
The size of current that every current source exports in code is equal to low 5 binary codings and reference current source circuit in 0.1uA precision
The benchmark output current of the electric current composition of output.
It is provided by the present invention to realize that the current steering digital-to-analog converter of digital calibration passes through in binary coding module
Middle parallel reference current source circuit, and in the both ends parallel connection calibration current source electricity of thermometer coding mould each current source in the block
Road differentiates the mismatch condition of thermometer coding mould current source in the block using current subtractor circuit by turn, and by calibrating electricity
Current source circuit calibrates the mismatch of each current source.This current steering digital-to-analog converter can not excessively increase chip face
Under the premise of product, power consumption and unitary current source size, the differential of the current steering digital-to-analog converter of segmentation mix type coding is reduced
It is non-linear, improve the linearity of current steering digital-to-analog converter.
It is provided by the present invention to realize that the current steering digital-to-analog converter of digital calibration be used in ic core
In piece.For the concrete structure of the current steering digital-to-analog converter in the IC chip, just no longer detail one by one herein.
In addition, the current steering digital-to-analog converter of above-mentioned realization digital calibration can be used in communication terminal, make
For the important component of Analogous Integrated Electronic Circuits.Communication terminal mentioned here refers to that can be used in mobile environment, is supported
The computer equipment of a variety of communication standards such as GSM, EDGE, TD_SCDMA, TDD_LTE, FDD_LTE, including mobile phone, notes
This computer, tablet computer, vehicle-mounted computer etc..In addition, technical solution provided by the present invention is also applied for the integrated electricity of other simulations
The occasion of road application, such as communication base station etc..
Above to current steering digital-to-analog converter, chip and the communication terminal provided by the present invention for realizing digital calibration
It is described in detail.It is right under the premise of without departing substantially from true spirit for those of ordinary skill in the art
Any obvious change that it is done, will all belong to the protection domain of patent right of the present invention.
Claims (10)
1. a kind of current steering digital-to-analog converter for realizing digital calibration, it is characterised in that including D/A conversion unit and number
Alignment unit, the D/A conversion unit include binary coding module and thermometer coding module, the digital calibration unit
Including current subtractor circuit, comparator, control and calibration logic, reference current source circuit and multiple calibration current sources electricity
Road, the binary coding module and the thermometer coding module connect with the input terminal of the current subtractor circuit respectively
It connects, the output end of the current subtractor circuit is connect with the in-phase input end of the comparator, the output end of the comparator
Connect with the input terminal of calibration logic with the control, it is described control with the output end of calibration logic respectively with it is each
The input terminal of the calibration current source circuit, the binary coding module are connected with the thermometer coding module, Mei Gesuo
The output end for stating calibration current source circuit is connect with the thermometer coding module respectively, and the reference current source circuit setting exists
The side of the binary coding module；
The electric current exported the thermometer coding module of reception by turn by the current subtractor circuit respectively with it is described
Binary coding module and the electric current summation of reference current source circuit output are compared, and comparison result passes through the comparison
Device is transmitted in the control and calibration logic, described to control calibration current source electricity corresponding with calibration logic regulation and control
The calibration size of current of road output, until the output of the comparator is overturn, completion to the thermometer coding module by
The calibration process of the electric current of position output.
2. current steering digital-to-analog converter as described in claim 1, it is characterised in that：
The binary coding module includes low level current source array and the first electric current gating switch array；
The current source that the low level current source array is encoded in binary form by p current value composes in parallel, and wherein p is
Positive integer；
The first electric current gating switch array is made of multiple single-pole three-throw switches；It is each in the low level current source array
A current source is connected with corresponding single-pole three-throw switch, and the first port and second port of each single-pole three-throw switch correspond to respectively
Connect the first current branch and the second current branch.
3. current steering digital-to-analog converter as claimed in claim 2, it is characterised in that：
The reference current source circuit is in parallel with the first current source of low level current source array, the reference current source circuit
Including a current source and the single-pole three-throw switch being connect with the current source, the first port of the single-pole three-throw switch and
Two-port netwerk is grounded respectively, and the third port of the single-pole three-throw switch is led in align mode with the current subtractor circuit
It is logical.
4. current steering digital-to-analog converter as claimed in claim 3, it is characterised in that：
The electric current of the current source output of the reference current source circuit and the first current source in the low level current source array
It is identical；And the electricity of the electric current and binary coding module output of the current source output of the reference current source circuit
Stream composition benchmark output current, the electric current for being exported by turn with the thermometer coding module are compared.
5. current steering digital-to-analog converter as described in claim 1, it is characterised in that：
The thermometer module includes high side current source array and the second electric current gating switch array；
High side current source array is by 2(n-p)The current source that a current value is encoded in the form of thermometer composes in parallel, wherein
N, p is positive integer；
The second electric current gating switch array is made of multiple single-pole three-throw switches；It is each in the array of the high side current source
A current source is connected with corresponding single-pole three-throw switch, and the first port and second port of each single-pole three-throw switch are correspondingly connected with
First current branch and the second current branch.
6. current steering digital-to-analog converter as claimed in claim 5, it is characterised in that：
Each current source in the array of the high side current source calibrates current source circuit, each calibration for one in parallel respectively
Current source circuit includes by 2(n-p+1)The 2 of a current source and electric current gating switch composition(n-p+1)A alignment unit, the calibration electricity
Each current source in current source circuit is connected with corresponding electric current gating switch；Each electric current in the calibration current source circuit
Gating switch is connect with the control with calibration logic respectively, for controlling one with calibration logic by the control
A or multiple electric current gating switches are on or off-state, regulate and control the calibration electricity of the calibration current source circuit output
The size of stream keeps the electric current that each current source in the array of the high side current source exports equal with benchmark output current.
7. current steering digital-to-analog converter as described in claim 1, it is characterised in that：
The current subtractor circuit includes current mirroring circuit, current-voltage conversion circuit；The current mirroring circuit uses prestige
The inferior current mirror of that or cascade type current mirror, wherein the wilson current mirror is made of three NMOS transistors, and first
The source electrode of NMOS transistor is connect together with the source series of the second NMOS transistor and with ground wire, the first NMOS crystal
The grid of pipe is connect with the grid of second NMOS transistor, the grid of second NMOS transistor and the 2nd NMOS
The drain electrode of the drain electrode short circuit of transistor, second NMOS transistor is connect with the source electrode of third NMOS transistor, the third
The grid of NMOS transistor respectively with the drain electrode of first NMOS transistor and the binary coding module and the reference
The third port of each single-pole three-throw switch in current source circuit connects, the drain electrode of the third NMOS transistor respectively with institute
State the third port connection of thermometer coding mould each single-pole three-throw switch in the block；
The current-voltage conversion circuit is made of operational amplifier and resistance, and the resistance is connected on the operational amplifier
Reverse input end and output end between, the positive input of the operational amplifier connects reference voltage, the operation amplifier
The drain electrode of the reverse input end connection third NMOS transistor of device, the output end of the operational amplifier and the comparator are just
It is connected to input terminal, the reverse input end of the comparator connects reference voltage.
8. current steering digital-to-analog converter as described in claim 1, it is characterised in that：
It is described control with calibration logic respectively with the binary coding module, the reference current source circuit and the temperature
Each single-pole three-throw switch connection in degree meter coding module, different ends is switched to for controlling each single-pole three-throw switch
On mouth.
9. a kind of IC chip, it is characterised in that the IC chip includes any one of claim 1~8
The current steering digital-to-analog converter.
10. a kind of communication terminal, it is characterised in that the communication terminal includes described in any one of claim 1~8
Current steering digital-to-analog converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810243147.1A CN108449089A (en) | 2018-03-23 | 2018-03-23 | Realize current steering digital-to-analog converter, chip and the communication terminal of digital calibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810243147.1A CN108449089A (en) | 2018-03-23 | 2018-03-23 | Realize current steering digital-to-analog converter, chip and the communication terminal of digital calibration |
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| Publication Number | Publication Date |
|---|---|
| CN108449089A true CN108449089A (en) | 2018-08-24 |
Family
ID=63196283
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810243147.1A Pending CN108449089A (en) | 2018-03-23 | 2018-03-23 | Realize current steering digital-to-analog converter, chip and the communication terminal of digital calibration |
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| CN (1) | CN108449089A (en) |
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| CN109286398A (en) * | 2018-09-19 | 2019-01-29 | 电子科技大学 | A current comparator and comparison method for current steering digital-to-analog converter correction |
| CN109921798A (en) * | 2019-03-20 | 2019-06-21 | 成都振芯科技股份有限公司 | Segmented current-steering digital-to-analog converter circuit and calibration method |
| CN110958021A (en) * | 2019-12-26 | 2020-04-03 | 北京时代民芯科技有限公司 | High-speed high-precision current rudder digital-to-analog converter self-calibration system and method |
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| CN109921798B (en) * | 2019-03-20 | 2023-04-25 | 成都振芯科技股份有限公司 | Segmented current steering digital-to-analog converter circuit and calibration method |
| CN112448720A (en) * | 2019-08-15 | 2021-03-05 | 天津大学青岛海洋技术研究院 | Current rudder type digital-to-analog converter with refreshing switch |
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| CN115514368A (en) * | 2021-06-22 | 2022-12-23 | 瑞昱半导体股份有限公司 | Method for calibrating output current, current control system and voltage control system |
| CN115642912A (en) * | 2021-07-20 | 2023-01-24 | 瑞昱半导体股份有限公司 | Digital-to-analog conversion circuit with signal correction mechanism and digital-to-analog conversion method |
| CN114531157A (en) * | 2022-02-22 | 2022-05-24 | 成都利普芯微电子有限公司 | Digital-to-analog conversion circuit, digital-to-analog conversion method and display driving chip |
| CN115173861A (en) * | 2022-07-14 | 2022-10-11 | 南京邮电大学 | Rail-to-rail current steering DAC structure with self-calibration function |
| CN117691996A (en) * | 2022-09-02 | 2024-03-12 | 中国科学院微电子研究所 | Current steering type DAC current source error rapid detection method, device and electronic equipment |
| CN117691996B (en) * | 2022-09-02 | 2026-02-03 | 中国科学院微电子研究所 | Method and device for rapidly detecting current rudder type DAC current source errors and electronic equipment |
| CN116015307B (en) * | 2023-03-27 | 2023-05-23 | 电子科技大学 | A current steering DAC |
| CN116015307A (en) * | 2023-03-27 | 2023-04-25 | 电子科技大学 | A current steering DAC |
| CN117375613A (en) * | 2023-12-06 | 2024-01-09 | 南京美辰微电子有限公司 | Calibration circuit and method for current source array in multichannel current steering DAC |
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| CN118199647A (en) * | 2024-03-20 | 2024-06-14 | 昂迈微(上海)电子科技有限公司 | A Segmented Current Steering DAC |
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| CN119210456A (en) * | 2024-09-10 | 2024-12-27 | 上海川土微电子有限公司 | A current comparator module for high-precision digital-to-analog converter calibration circuit |
| CN119210456B (en) * | 2024-09-10 | 2025-04-18 | 上海川土微电子有限公司 | A current comparator module for high-precision digital-to-analog converter calibration circuit |
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