CN107104673A - A kind of low gain error current rudder-type digital-to-analog converter, chip and communication terminal - Google Patents
A kind of low gain error current rudder-type digital-to-analog converter, chip and communication terminal Download PDFInfo
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- CN107104673A CN107104673A CN201710214181.1A CN201710214181A CN107104673A CN 107104673 A CN107104673 A CN 107104673A CN 201710214181 A CN201710214181 A CN 201710214181A CN 107104673 A CN107104673 A CN 107104673A
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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
Abstract
The invention discloses a kind of low gain error current rudder-type digital-to-analog converter, chip and communication terminal.The digital analog converter includes common mode and detects circuit, current source circuit, coding circuit, controlling switch array, first current branch, second current branch, load resistance, the output end of common mode detection circuit is connected with current source circuit, current source circuit, coding circuit is connected with controlling switch array respectively, controlling switch array respectively with the first current branch, second current branch is connected, first current branch, second current branch is connected with one end of corresponding load resistance, the other end ground connection of load resistance, first output voltage, the input that second output voltage and common-mode voltage detect circuit with common mode respectively is connected.Pass through the size of common-mode feedback mechanism dynamic regulation current source circuit output current, it is ensured that the output area of this digital analog converter is constant, reduces its gain error, extends its application.
Description
Technical field
The present invention relates to a kind of digital analog converter, more particularly to a kind of low gain error current rudder-type digital-to-analog converter, together
When be directed to include the IC chip and corresponding communication terminal of the low gain error current rudder-type digital-to-analog converter, belong to
Analogous Integrated Electronic Circuits technical field.
Background technology
Digital analog converter is the bridge of UNICOM's data signal and analog signal, is widely used in digital-to-analogue mixed signal system
In.Generally, the conversion of data signal and analog signal, current steer type digital-to-analogue conversion are realized using current steering digital-to-analog converter
Device is high due to currents match degree, thus can realize very high conversion accuracy.
Fig. 1 show a kind of basic structure of existing current steering digital-to-analog converter, and it is mainly by several current sources
With several electric current gating switches composition.In the prior art, should for the digital analog converter of n (n is positive integer, similarly hereinafter) position
Current steer pattern number converter uses n current value with binary-coded current source, and these current sources are selected by electric current respectively
Open up connection to be connected on load resistance, electric current gating switch is in input coding b<0:N-1>Control under all current sources are converged
It is always two current branch of Iout+ and Iout-.Such two current branch flow to load resistance and form differential output voltage
Vout+ and Vout-, the expression formula of differential output voltage is shown below：
From formula (1), the scope (gain) of the differential output voltage of the current steering digital-to-analog converter is by current source
I0~In and load resistance Rload precision controlling.In integrated circuit technology, the precision of current source is also by resistance device
Precision controlling.Therefore, the gain characteristic of the current steering digital-to-analog converter is by resistance device precision controlling.So
And, the absolute precision of resistance device be it is difficult to ensure that, cause the gain characteristic of the current steering digital-to-analog converter greatly by
It is limited to the precision of resistance device, makes it have larger gain error, so as to limits the application of current steering digital-to-analog converter
Scope.
The content of the invention
Primary technical problem to be solved by this invention is to provide a kind of low gain error current rudder-type digital-to-analog converter.
Another technical problem to be solved by this invention is to provide a kind of including the low gain error current rudder type digital-to-analogue
The IC chip of converter and corresponding communication terminal.
In order to realize foregoing invention purpose, the present invention uses following technical schemes：
First aspect according to embodiments of the present invention there is provided a kind of low gain error current rudder-type digital-to-analog converter, including
Common mode detection circuit, current source circuit, coding circuit, controlling switch array, the first current branch, the second current branch, load
Resistance；The output end of the common mode detection circuit is connected with the current source circuit, the current source circuit, the coding circuit
Be connected respectively with the controlling switch array, the controlling switch array respectively with first current branch, it is described second electricity
Branch road connection is flowed, first current branch, second current branch are connected with one end of the corresponding load resistance, institute
The other end ground connection of load resistance is stated, the first output voltage, the second output voltage and common-mode voltage are examined with the common mode respectively
The input connection of slowdown monitoring circuit.
Wherein more preferably, the current source circuit is made up of n current source array, the output current of the current source array
Value uses binary coded form, and wherein n is positive integer.
Wherein more preferably, the current source circuit is n common-source common-gate current mirror current source, the n cascade electricity
Stream mirror current source is made up of an PMOS transistor with corresponding bn PMOS transistor being connected, and wherein a, b are positive integer.
Wherein more preferably, in an PMOS transistors, the source electrode of each PMOS transistor respectively with power supply
Voltage is connected, and the output end that the grid of each PMOS transistor detects circuit with the common mode respectively is connected, each described
The drain electrode of PMOS transistor is connected with the source electrode of the corresponding PMOS transistor in the bn PMOS transistors；
In the bn PMOS transistors, the grid of each PMOS transistor is connected with bias voltage respectively, often
The drain electrode of individual PMOS transistor controlling switch connection corresponding with the controlling switch array respectively.
Wherein more preferably, the controlling switch array is made up of the n controlling switch arrays, and the controlling switch is single
Double-pole double throw switch or gating switch, the anode of the single-pole double-throw switch (SPDT) are connected with first current branch, and the hilted broadsword is double
The negative terminal of throw switch is connected with second current branch, the gating switch respectively with first current branch, described
Two current branch correspondence is connected.
Wherein more preferably, the coding circuit is using n control codes, and the control code is binary digital signal, is passed through
The binary digital signal controls corresponding controlling switch and first current branch or institute in the controlling switch array
The second current branch UNICOM is stated, realization makes the low gain error current rudder-type digital-to-analog converter export first output voltage
Or second output voltage.
Wherein more preferably, the common mode detection circuit is used to detect first output voltage and the described second output electricity
Pressure, when first output voltage or second output voltage are higher than common-mode voltage, the common mode detection circuit control institute
The electric current for stating current source circuit output diminishes to reduce by first output voltage or second output voltage；When described first
When output voltage or second output voltage are less than common-mode voltage, the common mode detection circuit controls the current source circuit defeated
The electric current gone out becomes greatly to improve first output voltage or second output voltage；The low gain error current rudder type number
Weighted-voltage D/A converter is in the presence of negative-feedback, and realization makes first output voltage or second output voltage stabilization be described common
Mode voltage value, and meet equation below
Wherein, Vcm is common-mode voltage,For current source I0~In-1 output current value, Rload is load resistance.
Wherein more preferably, the common mode detects circuit by an operational amplifier, the first common mode detection resistance and second
Common mode detection resistance is constituted, and the common-mode voltage is connected with the reverse input end of the operational amplifier, the first output electricity
The positive input with second output voltage respectively with the operational amplifier is pressed to be connected, the first common mode detection resistance
It is serially connected between first output voltage and the positive input of the operational amplifier, the second common mode detection resistance string
Be connected between second output voltage and the positive input of the operational amplifier, the output end of the operational amplifier with
The current source circuit connection.
Second aspect according to embodiments of the present invention is there is provided a kind of IC chip, and which includes above-mentioned low increasing
Beneficial error current rudder-type digital-to-analog converter.
The third aspect according to embodiments of the present invention is there is provided a kind of communication terminal, and which includes above-mentioned low gain mistake
Spill current rudder-type digital-to-analog converter.
Low gain error current rudder-type digital-to-analog converter provided by the present invention detects circuit, current source by using common mode
Circuit, coding circuit, controlling switch array and load resistance composition common-mode feedback mechanism, are dynamically adjusted by common-mode feedback mechanism
The size of the electric current of current source circuit of economizing on electricity output, so as to ensure the output area of this low gain error current rudder-type digital-to-analog converter
It is constant, and the output area of this low gain error current rudder-type digital-to-analog converter is only depended on the reference voltage of a certain fixation
Value, still ensures that its output area is constant when relatively large deviation occurs in load resistance, it is achieved thereby that reducing this low gain error
The gain error of current steering digital-to-analog converter, extends its application.
Brief description of the drawings
Fig. 1 is the structural representation of low gain error current rudder-type digital-to-analog converter in the prior art；
Fig. 2 is the structural representation of low gain error current rudder-type digital-to-analog converter provided by the present invention；
Fig. 3 is the structural representation of low gain error current rudder-type digital-to-analog converter exemplary embodiments provided by the present invention
Figure.
Embodiment
The technology contents of the present invention are described in further detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in Fig. 2 low gain error current rudder-type digital-to-analog converter provided by the present invention is n digit weighted-voltage D/A converters (n
For positive integer, similarly hereinafter), the low gain error current rudder-type digital-to-analog converter includes common mode detection circuit, current source circuit, coding
Circuit, controlling switch array, the first current branch Iout+, the second current branch Iout-, load resistance Rload.Wherein, altogether
The output end of mould detection circuit is connected with current source circuit, and current source circuit and coding circuit connect with controlling switch array respectively
Connect, controlling switch array is connected with the first current branch Iout+, the second current branch Iout- respectively, the first current branch
Iout+, the second current branch Iout- are connected with corresponding load resistance Rload one end, the load resistance Rload other end
Ground wire is connected, and the input of common mode detection circuit connects the first output voltage Vout+, the second output voltage Vout- respectively
And common-mode voltage Vcm.Common-mode feedback mechanism dynamic regulation electricity is used by this low gain error current rudder-type digital-to-analog converter
The size of the electric current of stream source output is constant with the scope for ensureing the output of this current steering digital-to-analog converter, reduces this current steer type
The gain error of digital analog converter, extends its application.
In low gain error current rudder-type digital-to-analog converter provided by the present invention, current source circuit is by n current source
Array is constituted, wherein, current source I0~In-1 output current value (but is not limited only to binary system using binary coded form
Coding), and current source I0~In-1 controlling switch connections corresponding with controlling switch array, controlling switch array respectively
It is made up of n controlling switch array, controlling switch can select single-pole double-throw switch (SPDT) or gating switch (as shown in Figure 1).Electric current
Source I0~In-1 single-pole double-throw switch (SPDT) or gating switch connections corresponding with single-pole double-throw switch (SPDT) S0~Sn-1, each list
The anode of double-pole double throw switch connects the first current branch Iout+, and the negative terminal of each single-pole double-throw switch (SPDT) connects the second electric current branch
Road Iout-, or gating switch connection corresponding with the first current branch Iout+, the second current branch Iout- respectively.Pass through
First current branch Iout+ is connected with a load resistance Rload respectively with the second current branch Iout-, by making first
Current branch Iout+ forms the first output voltage after flowing through corresponding load resistance Rload with the second current branch Iout-
Vout+ and the second output voltage Vout-, the first output voltage Vout+ and the second output voltage Vout- constitute difference output
Voltage.Coding circuit is using n control codes, and the control code (but is not limited only to binary system for binary digital signal b0~bn-1
Data signal), corresponding single-pole double-throw switch (SPDT) S0~Sn-1 UNICOMs are controlled by binary digital signal b0~bn-1
To anode or negative terminal, realization makes this low gain error current rudder-type digital-to-analog converter export the first output voltage Vout+ and second
Output voltage Vout-.
The operation principle of low gain error current rudder-type digital-to-analog converter provided by the present invention is：When coding circuit output
Binary digital signal when being 1, corresponding single-pole double-throw switch (SPDT) UNICOM is controlled to just by the binary digital signal
End, now, the first current branch Iout+ flow through load resistance Rload the first output voltage Vout+ of formation, the first output electricity
Pressure Vout+ feeds back to the input that common mode detects circuit.When the binary digital signal that coding circuit is exported is 0, by this
Binary digital signal controls corresponding single-pole double-throw switch (SPDT) UNICOM to negative terminal, now, the second current branch Iout- streams
Common mode detection is equally fed back to through the second output voltage Vout- of load resistance Rload formation, second output voltage Vout-
The input of circuit.By common mode detect electric circuit inspection by this low gain error current rudder-type digital-to-analog converter export it is first defeated
Go out voltage Vout+ and the second output voltage Vout-, and by the first output voltage Vout+ and the second output voltage Vout- and institute
It is required that common-mode voltage Vcm be compared, by the difference compared to be fed back in the form of output signal on current source circuit, when altogether
The the first output voltage Vout+ or the second output voltage Vout- that the input of mould detection circuit is detected are higher than common-mode voltage
During Vcm, common mode detection circuit diminishes the electric current exported by output signal control electric current source circuit to reduce the first of output
Output voltage Vout+ or the second output voltage Vout-, electric current that is on the contrary then being exported by output signal control electric current source becomes big
To improve the first output voltage Vout+ or the second output voltage Vout- of output, finally in the presence of negative-feedback, realization makes
The the first output voltage Vout+ or the second output voltage Vout- of this low gain error current rudder-type digital-to-analog converter output will be steady
It is set to common-mode voltage Vcm values, therefore following formula 2 is set up all the time.
It can be drawn by formula (2)：The difference of low gain error current rudder-type digital-to-analog converter provided by the present invention is defeated
The scope for going out voltage is -2Vcm~+2Vcm, and it is 0 that each current branch, which flows through the output voltage range formed after load resistance,
~2Vcm.Wherein, common-mode voltage Vcm can be generated by generating circuit from reference voltage and be had higher precision, it is ensured that this low increasing
The value range of beneficial error current rudder-type digital-to-analog converter output voltage has higher precision.So, this low gain error current
The method that rudder-type digital-to-analog converter detects the size of the output signal control electric current source output current of circuit by using common mode, no
It only ensure that the scope of this low gain error current rudder-type digital-to-analog converter output voltage is constant, and also assures that its output electricity
The precision of pressure, it is achieved thereby that reducing the gain error of this low gain error current rudder-type digital-to-analog converter.
In order that the technical scheme of low gain error current rudder-type digital-to-analog converter provided by the present invention becomes apparent from, under
Face is combined Fig. 3 and is described in detail using a specific embodiment as typical case.
As shown in figure 3, in the low gain error current rudder-type digital-to-analog converter that the embodiment is provided, common mode detection electricity
Road can be made up of an operational amplifier, the first common mode detection resistance R1 and the second common mode detection resistance R2；Wherein, common mode
The reverse input end connection of voltage Vcm and operational amplifier, the first output voltage Vout+ and the second output voltage Vout- distinguish
It is connected with the positive input of operational amplifier, and in the first output voltage Vout+ and the positive input of operational amplifier
Between concatenate the first common mode detection resistance R1, between the second output voltage Vout- and the positive input of operational amplifier go here and there
The second common mode detection resistance R2 is met, the output end of operational amplifier is connected with current source circuit.Current source circuit can be by an
PMOS transistor array and bn PMOS transistor array composition (a, b are positive integer, similarly hereinafter)；Wherein, in PMOS transistor Ma0
In~Man-1, the source electrode of each PMOS transistor is connected with supply voltage VDD respectively, the grid of each PMOS transistor
It is connected respectively with the output end of operational amplifier, in the drain electrode of each PMOS transistor and PMOS transistor Mb0~Mbn-1
The source electrode connection of corresponding PMOS transistor.In PMOS transistor Mb0~Mbn-1, the grid of each PMOS transistor
Pole is connected with bias voltage Vb respectively, the drain electrode of each PMOS transistor respectively with it is right in single-pole double-throw switch (SPDT) S0~Sn-1
The single-pole double-throw switch (SPDT) connection answered.Same as above, the anode of each single-pole double-throw switch (SPDT) connects the first current branch Iout+,
The negative terminal of each single-pole double-throw switch (SPDT) connects the second current branch Iout-.By by the first current branch Iout+ and second
Current branch Iout- is connected with a load resistance Rload respectively, by making the first current branch Iout+ and the second electric current branch
Road Iout-, which is flowed through, forms the first output voltage Vout+ and the second output voltage Vout- after corresponding load resistance Rload.Compile
The structure and control process of code circuit are same as above, will not be repeated here.It is emphasized that in current source circuit,
PMOS transistor Ma0~Man-1 and coupled PMOS transistor Mb0~Mbn-1 constitute n common-source common-gate current mirror
Current source, the current source is also to use binary coded form.
In the low gain error current rudder-type digital-to-analog converter that the present embodiment is provided, when load resistance Rload resistance
When deviation occurs in PMOS transistor size in value or current source circuit, the first output voltage Vout+ or second is caused to export
Voltage Vout- magnitude of voltage rise, so that the voltage of operational amplifier positive input is increased, therefore puts computing
The magnitude of voltage rise of the output end output of big device, what the voltage exported by operational amplifier can be exported with control electric current source circuit
Current value reduces, and then reduces the first output voltage Vout+ or the second output voltage Vout- magnitude of voltage, and the process is formd
The the first output voltage Vout+ or the second output voltage Vout- exported after common-mode feedback mechanism, stabilization to be feedback will be steady all the time
It is set to common-mode voltage Vcm values.
Low gain error current rudder-type digital-to-analog converter provided by the present invention detects circuit, current source by using common mode
Circuit, coding circuit, controlling switch array and load resistance Rload composition common-mode feedback mechanism, pass through common-mode feedback mechanism
The size of the electric current of dynamic regulation current source circuit output, so as to ensure the defeated of this low gain error current rudder-type digital-to-analog converter
Go out that scope is constant, and the output area of this low gain error current rudder-type digital-to-analog converter is only depended on the ginseng of a certain fixation
Magnitude of voltage is examined, still ensures that its output area is constant when relatively large deviation occurs in load resistance, it is achieved thereby that reducing this low increasing
The gain error of beneficial error current rudder-type digital-to-analog converter, extends its application.
Low gain error current rudder-type digital-to-analog converter provided by the present invention can be used in Analogous Integrated Electronic Circuits chip
In.For the concrete structure of the low gain error current rudder-type digital-to-analog converter in the Analogous Integrated Electronic Circuits chip, herein just not
Detail one by one again.
In addition, above-mentioned low gain error current rudder-type digital-to-analog converter can be used in communication terminal, simulation is used as
The important component of integrated circuit.Communication terminal mentioned here refers to use in mobile environment, support GSM,
The computer equipment of a variety of communication standards such as EDGE, TD_SCDMA, TDD_LTE, FDD_LTE, including mobile phone, notebook electricity
Brain, tablet personal computer, vehicle-mounted computer etc..Answered in addition, technical scheme provided by the present invention is also applied for other Analogous Integrated Electronic Circuits
Occasion, such as communication base station.
Low gain error current rudder-type digital-to-analog converter provided by the present invention, chip and communication terminal are carried out above
Detailed description.For those of ordinary skill in the art, it is done on the premise of without departing substantially from true spirit
It is any it is obvious change, will all belong to the protection domain of patent right of the present invention.
Claims (10)
1. a kind of low gain error current rudder-type digital-to-analog converter, it is characterised in that including common mode detection circuit, current source circuit,
Coding circuit, controlling switch array, the first current branch, the second current branch, load resistance；
The output end of the common mode detection circuit is connected with the current source circuit, the current source circuit, the coding circuit
Be connected respectively with the controlling switch array, the controlling switch array respectively with first current branch, it is described second electricity
Branch road connection is flowed, first current branch, second current branch are connected with one end of the corresponding load resistance, institute
The other end ground connection of load resistance is stated, the first output voltage, the second output voltage and common-mode voltage are examined with the common mode respectively
The input connection of slowdown monitoring circuit.
2. low gain error current rudder-type digital-to-analog converter as claimed in claim 1, it is characterised in that：
The current source circuit is made up of n current source array, and the output current value of the current source array is compiled using binary system
Code form, wherein n is positive integer.
3. low gain error current rudder-type digital-to-analog converter as claimed in claim 2, it is characterised in that：
The current source circuit is n common-source common-gate current mirror current source, and the n common-source common-gate current mirror current source is by an
PMOS transistor and the corresponding bn PMOS transistor composition being connected, wherein a, b is positive integer.
4. low gain error current rudder-type digital-to-analog converter as claimed in claim 3, it is characterised in that：
In an PMOS transistors, the source electrode of each PMOS transistor is connected with supply voltage respectively, Mei Gesuo
The output end that the grid for stating PMOS transistor detects circuit with the common mode respectively is connected, the drain electrode of each PMOS transistor
Connected with the source electrode of the corresponding PMOS transistor in the bn PMOS transistors；
In the bn PMOS transistors, the grid of each PMOS transistor is connected with bias voltage respectively, Mei Gesuo
State the drain electrode controlling switch connection corresponding with the controlling switch array respectively of PMOS transistor.
5. the low gain error current rudder-type digital-to-analog converter as described in claim 1 or 4, it is characterised in that：
The controlling switch array is made up of the n controlling switch arrays, and the controlling switch is single-pole double-throw switch (SPDT) or choosing
Open up pass, the anode of the single-pole double-throw switch (SPDT) is connected with first current branch, the negative terminal of the single-pole double-throw switch (SPDT) with
The second current branch connection, the gating switch is corresponding with first current branch, second current branch respectively
Connection.
6. low gain error current rudder-type digital-to-analog converter as claimed in claim 1, it is characterised in that：
The coding circuit is binary digital signal using n control codes, the control code, is believed by the binary digit
Corresponding controlling switch joins with first current branch or second current branch in number control controlling switch array
Logical, realization makes the low gain error current rudder-type digital-to-analog converter export first output voltage or the second output electricity
Pressure, wherein n is positive integer.
7. low gain error current rudder-type digital-to-analog converter as claimed in claim 1, it is characterised in that：
The common mode detection circuit is used to detect first output voltage and second output voltage, when the described first output
When voltage or second output voltage are higher than common-mode voltage, the common mode detection circuit controls the current source circuit output
Electric current diminishes to reduce by first output voltage or second output voltage；When first output voltage or described second
When output voltage is less than common-mode voltage, the common mode detection circuit controls the electric current change of the current source circuit output big to improve
First output voltage or second output voltage；The low gain error current rudder-type digital-to-analog converter is in negative-feedback
Under effect, realization makes first output voltage or second output voltage stabilization be the common-mode voltage value, and meet as
Lower formula
<mrow>
<mn>2</mn>
<msub>
<mi>V</mi>
<mrow>
<mi>c</mi>
<mi>m</mi>
</mrow>
</msub>
<mo>=</mo>
<mrow>
<mo>(</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>0</mn>
</mrow>
<mrow>
<mi>n</mi>
<mo>-</mo>
<mn>1</mn>
</mrow>
</munderover>
<msub>
<mi>I</mi>
<mi>i</mi>
</msub>
<mo>)</mo>
</mrow>
<msub>
<mi>R</mi>
<mrow>
<mi>l</mi>
<mi>o</mi>
<mi>a</mi>
<mi>d</mi>
</mrow>
</msub>
</mrow>
Wherein, Vcm is common-mode voltage,For current source I0~In-1 output current value, Rload is load resistance.
8. low gain error current rudder-type digital-to-analog converter as claimed in claim 1, it is characterised in that：
The common mode detects circuit by an operational amplifier, the first common mode detection resistance and the second common mode detection resistance group
Into the common-mode voltage is connected with the reverse input end of the operational amplifier, first output voltage and described second defeated
Go out positive input of the voltage respectively with the operational amplifier to be connected, the first common mode detection resistance is serially connected in described first
Between the positive input of output voltage and the operational amplifier, it is defeated that the second common mode detection resistance is serially connected in described second
Between the positive input for going out voltage and the operational amplifier, the output end of the operational amplifier and the current source circuit
Connection.
9. a kind of IC chip, it is characterised in that include in the IC chip any one in claim 1~8
Low gain error current rudder-type digital-to-analog converter described in.
10. a kind of communication terminal, it is characterised in that include in the communication terminal in claim 1~8 described in any one
Low gain error current rudder-type digital-to-analog converter.
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Cited By (10)
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|---|---|---|---|---|
| CN108449089A (en) * | 2018-03-23 | 2018-08-24 | 上海唯捷创芯电子技术有限公司 | Realize current steering digital-to-analog converter, chip and the communication terminal of digital calibration |
| CN108776265A (en) * | 2018-07-11 | 2018-11-09 | 重庆线易电子科技有限责任公司 | Dynamic impedance circuit and signal deteching circuit |
| CN109062307A (en) * | 2018-09-18 | 2018-12-21 | 杭州洪芯微电子科技有限公司 | The precision current source circuit of multiple bit digital control |
| CN109309498A (en) * | 2018-11-08 | 2019-02-05 | 东南大学 | A kind of current steering digital-to-analog converter based on thermometer-code |
| CN109547026A (en) * | 2018-11-08 | 2019-03-29 | 东南大学 | A kind of current steering digital-to-analog converter based on R-2R resistor network |
| CN109557376A (en) * | 2017-09-27 | 2019-04-02 | 日本电产理德股份有限公司 | Resistance measurement device, base board checking device and resistance measurement method |
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Application publication date: 20170829 |