CN207490884U - High-resolution digital potentiometer - Google Patents
High-resolution digital potentiometer Download PDFInfo
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- CN207490884U CN207490884U CN201720909035.6U CN201720909035U CN207490884U CN 207490884 U CN207490884 U CN 207490884U CN 201720909035 U CN201720909035 U CN 201720909035U CN 207490884 U CN207490884 U CN 207490884U
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Abstract
The utility model provides a kind of high-resolution digital regulation resistance, including at least two and above unit digital regulation resistance in parallel or in series, wherein each unit digital regulation resistance can control its output by digital interface.The utility model patent overcomes the digital regulation resistance of CMOS technology manufacture in the prior art due to the not high technological deficiency of precision caused by technique, reach the resolution ratio for improving digital regulation resistance, improve the controllable precision of digital regulation resistance and improve the effect of digital regulation resistance maximum range.
Description
Technical field
The utility model embodiment is related to electronic circuit field more particularly to a kind of high-resolution digital regulation resistance.
Background technology
Digital regulation resistance is just rapid at home and abroad to be promoted, and is widely used in detecting instrument, PC, mobile phone, household electrical appliance, is showed
For fields such as office equipment, Industry Control, Medical Devices.Such as：Refrigerator, programme-controlled, power supply, power meter, automatic detection are set
Standby, fiber optic network adjusts LCD display, voltage control, mechanical potentiometer, matching linear impedance, adjusting VCOM is replaced to set
It puts.
From the point of view of current prospect of the application, digital regulation resistance is a kind of Novel electronic devices for having much development prospect, is being permitted
It is multi-field to may replace traditional mechanical potentiometer.Its advantage is：Degree of regulation is high；Noiseless, working life are extremely long；It is ground without machinery
Damage；Data are read-write；With configuration register and data register；More level amount store functions.It is widely used in instrument instrument
The fields such as table, computer and communication equipment, household electrical appliance, medical and health-care products, Industry Control.Any need is carried out with resistance
Parameter adjustment and the occasion of control, all digital regulation resistance can be used to form programmable analog circuit.But in actual use should
Pay special attention to the resistance alignment error of digital regulation resistance, error influence factor during due to different application occasion is different.Cause
This is in practical application, preferably accurately measure it using A/D conversion circuits, and it is compensated using microcontroller.
But during actual use, when output accuracy higher digital regulation resistance is needed, due to by
It is limited to CMOS technology, dead resistance including tap etc. causes the high-resolution digital current potential of low resistance to be often difficult to realize.Cause
This, if it is possible to the resolution ratio of current existing high-resolution digital potentiometer is improved, with regard to the essence of digital regulation resistance can be improved
Limit value is spent, practical ranges and application scenarios to digital regulation resistance there will be very important meaning.
Utility model content
In view of this, one of the technical issues of the utility model embodiment solves is to provide high-resolution number electricity
Position device, to overcome the digital regulation resistance of CMOS technology manufacture in the prior art since the not high technology of precision caused by technique lacks
It falls into, reaches the resolution ratio for improving digital regulation resistance, improve the controllable precision of digital regulation resistance and adjust the defeated of digital regulation resistance
Go out the effect of resistance range.
The utility model embodiment provides a kind of high-resolution digital regulation resistance, including at least two and above list
First digital regulation resistance in parallel or series, wherein each unit digital regulation resistance can individually control its defeated by digital interface
Go out.
Optionally, in an embodiment of the utility model, described two and above unit digital regulation resistances is at one
Chip interior.
Optionally, in an embodiment of the utility model, the high-resolution digital potentiometer includes storage unit；
Optionally, in an embodiment of the utility model, the storage unit stores entire high-resolution digital electricity
The calibration data of position device；
Optionally, in an embodiment of the utility model, described two and above unit digital regulation resistances is using same
The power supply power supply of sample.
Optionally, in an embodiment of the utility model, further include fixed resister, fixed resister and two and more than
Unit digital regulation resistance in parallel or in series.
Optionally, in an embodiment of the utility model, multiple unit digital regulation resistances be can also be in parallel and serial
Combination；
By above technical scheme as it can be seen that the high-resolution digital regulation resistance, overcomes CMOS technology system in the prior art
The digital regulation resistance made is reached the resolution ratio for improving digital regulation resistance, is carried due to the not high technological deficiency of precision caused by technique
The controllable precision of high digital regulation resistance and the effect of maximum range.The defects of so as to overcome the prior art.
Description of the drawings
It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments described in the utility model embodiment, it for those of ordinary skill in the art, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is the structure diagram of common unit digital regulation resistance；
Fig. 2 is the structure diagram in the utility model embodiment；
Fig. 3 is the structure diagram of the digital regulation resistance AD5142 of ADI；
Fig. 4 is the combination diagram of digital regulation resistance network and fixed resister；
Specific embodiment
Certainly, implement any technical solution of the utility model embodiment must be not necessarily required to reach simultaneously more than it is all
Advantage.
In order to which those skilled in the art is made to more fully understand the technical scheme in the embodiment of the utility model, below in conjunction with this
Attached drawing in utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, shows
So, described embodiment is only the utility model embodiment part of the embodiment, instead of all the embodiments.Based on this reality
With the embodiment in new embodiment, those of ordinary skill in the art's all other embodiments obtained should all belong to this
The range of utility model embodiment protection.
Further illustrate that the utility model embodiment implements with reference to the utility model embodiment attached drawing.
Digital regulation resistance (DigitalPotenTIometer) is also known as numerical control programmable resistance, be it is a kind of replace traditional machine
The New-type CMOS number of tool potentiometer (simulation potentiometer), the integrated circuit of analog mixed-signal processing.In addition digital regulation resistance
Adjustment during, the resistance value of digital regulation resistance is not consecutive variations, but after adjustment just have it is desirable
Output.This is because digital regulation resistance uses metal-oxide-semiconductor as switching circuit, and using the control method of " first open and close afterwards ".And
And digital regulation resistance can not realize the continuous adjustment of resistance, can only by the minimum resistance on resistor network in digital regulation resistance into
Row adjustment.In addition the operational characteristic of cmos semiconductor technique, the precision and resolution ratio of digital regulation resistance are often all than relatively low.
Fig. 1 is the schematic diagram of the unit digital regulation resistance of the embodiment of the present application；It includes resistance, the N that N number of resistance value is Rs
A analog switch and a decoder composition.When input of the input digital signal of the decoder as digital regulation resistance,
The decoder always controls one of conducting of N number of analog switch, remaining analog switch is then closed.
Assuming that the input of the decoder is D, then decoder will control the D analog switch between Ax and Wx to open, then
Resistance value R between Ax and Wx can be expressed as
R=Rs*D
It is achieved thereby that conversion work of the digital quantity of digital value realization to resistance value.Under normal conditions, due to semiconductor
The limitation of technique, the resistance value of Rs can not do it is smaller, otherwise accuracy, consistency and stability it is difficult to ensure that.
It is the list of the chip model that can be provided of digital regulation resistance main manufacturer ADI, wherein tap number in table 1
1024 are up to, in this series of unit digital regulation resistance and at present the highest resolution that can accomplish in the world,
However in the unit digital regulation resistance of this series, the minimum 10K of range of resistance value, that is to say, that the unit number of this series
The minimum resolution of potentiometer is 10 ohms, for needing the higher digital regulation resistance of resolving accuracy, is almost difficult to
It completes.
Under such technological deficiency, the following embodiments of the utility model provide a kind of high-resolution digital potentiometer,
It include at least two and above unit digital regulation resistance in parallel or series, wherein each unit digital regulation resistance can be with
Its output is controlled by digital interface.
Fig. 2 is the structure diagram of the digital regulation resistance of the utility model embodiment middle high-resolution；
In the utility model embodiment, the parallel combination of two unit digital regulation resistances in left figure is two lists in right figure
The tandem compound of first digital regulation resistance, wherein the unit digital regulation resistance selected is carried out by taking the AD5175-10 of list in table 1 as an example
Illustrating, wherein AD5175-10 has 1024 taps, and maximum value range is 10K ohm, as described above, unit number electricity
The minimum resistance value that position device can change is 10 ohm.When using the parallel-connection structure in left side in figure, one on the left of only adjustment
Unit digital regulation resistance, when right sided cell digital regulation resistance does not change, the resistance value of entire digital regulation resistance substantially changes
For 2.5 ohms, if adjusting the unit digital regulation resistance on right side again, the unit digital regulation resistance in left side remains unchanged, then
It can continue to increase by 2.5 ohms in original basis again, be 2.5 ohm so as to reach resolution ratio, total range is 5K ohm
Technique effect.When using the cascaded structure on right side in figure, when a unit number current potential for only adjusting upper end either lower end
During device, the resolution ratio of entire digital regulation resistance is still changed with 10 ohm of multiple, but total range can reach 20K Europe
Nurse.It can be seen that in this way, the range and resolution ratio of entire digital regulation resistance can all change a lot, if
According to the parallel-connection structure in left side, it is continuously increased unit digital regulation resistance quantity in parallel, it might even be possible to reach unlimited subdivision number
The effect of the resistance value of potentiometer, it will greatly change the shortcomings that digital regulation resistance can not connect, effectively improve digital regulation resistance
More scope of applications.
Specifically, in the utility model embodiment, two unit digital regulation resistances in parallel have been selected in same collection
Into two unit digital regulation resistances on circuit, as shown in Figure 3.In normal semiconductor technology, since the processing of semiconductor is given birth to
Production influenced by technique it is bigger, the temperature especially in technique stove be difficult accomplish really uniformly, the temperature in different wafers
Degree is just easy to that there are deviations, then the deviation of two chips being closely located to, technique and final chip parameter is got over
It is small.Otherwise the stepping of the different unit digital regulation resistance of technique may difference it is bigger, then in summary, same chip
On two unit digital regulation resistances between technological parameter and final deviation will be minimum, then will improve entire
The linearity of digital regulation resistance output.
Specifically, in the utility model embodiment, the high-resolution digital potentiometer includes storage unit.Specifically such as
Shown in Fig. 3, the EEPROM in figure is the storage unit of entire digital regulation resistance, and the high score can be stored in the storage unit
Many parameters of resolution digital regulation resistance, for example the unique identification ID number of the digital regulation resistance is represented, including the digital regulation resistance
Date of manufacture, the usage time of Expiration Date, the even digital regulation resistance etc. can be recorded in the storage unit.
However, it the particularly important is the school that the entire high-resolution digital potentiometer can be stored inside the storage unit
Calibration information.Or it is illustrated by taking the AD5175-10 of the ADI of list in table 1 as an example, wherein AD5175-10 has 1024 pumpings
Head, maximum value range are 10K ohm, and as described above, the minimum resistance value that unit digital regulation resistance can change is 10 ohm.
However actually 10K ohm is ideal value, is influenced and final service condition by various aspects technique, often final resistance value
For range between 9K-11K, some even can reach 12K or so, then the minimum resistance that unit digital regulation resistance can change
Value also becomes 12 ohm.Under the premise of such, to reach accurately resistance value output, high-precision universal can be passed through in advance
Table measures the electric parameter of each digital regulation resistance, such as maximum range.Then by the practical electrical special of each digital regulation resistance
Property is stored in inside storage unit, and actually the calibration information of the digital regulation resistance has been deposited into storage unit, from
And when ensureing that external control devices control the resistance value of entire digital regulation resistance output, the calibration of the digital regulation resistance can be read
Data, and can be by the more accurate and accurate of resistance value output according to calibration information.
Specifically, it is main as shown in figure 3, described two and above unit digital regulation resistance are powered using same power supply
If due to the characteristic of digital regulation resistance, as shown in Figure 1, the conducting that the work of digital regulation resistance passes through decoder and analog switch
To realize.Wherein, when the power supply of two digital regulation resistances differs, can cause two unit digital regulation resistances decoder and
The threshold level of analog switch changes, and the output that will eventually lead to entire high-resolution digital potentiometer is unstable.
Specifically, in the example of the utility model, high-resolution digital potentiometer further includes fixed resister, fixed resistance
Device and two and above unit digital regulation resistance are in parallel or in series.As shown in figure 4, two unit number current potentials above
Device 603 and digital regulation resistance 604 and fixed resister constitute entire digital regulation resistance.Main purpose is this kind of structure
Entire high-resolution output area can be adjusted still to illustrate by taking the AD5175-10 of the ADI of list in table 1 as an example, it should
The maximum range resistance value of device is 10K ohm, and two variation ranges of digital regulation resistance network composed in parallel are 0-5K Europe
Nurse, if the resistance value of fixed resister is set as 1K ohm, then the resistance value range of entire high-resolution digital potentiometer
Become in order between 1K-6K ohm, not only without loss resolution ratio, minimum resistance value has also been subjected to raising suitably.Same road
Reason, if in the fixed resistance of two unit digital regulation resistance both ends other resistance values in parallel, it again can be to entire high-resolution
The final output resistance value of rate digital regulation resistance is compressed, while still maintain high-resolution.
According to combination described above, a unit digital regulation resistance in parallel can increase the resolution ratio of entire digital regulation resistance
Reduce maximum resistance output range simultaneously, one unit digital regulation resistance of series connection or fixed resistance can increase entire digital current potential
The resolution ratio of device increases maximum resistance output range simultaneously, and a fixed resister in parallel can not change resolution ratio, reduce maximum
Resistance output range, a fixed resister of connecting increase maximum resistance output range.It specifically, in the present embodiment, can be with
It is whole so as to ensure by the combination of the network of various digital regulation resistance parallel networks, series network and various fixed resisters
The output of a high-resolution digital potentiometer can reach the required resolution ratio met the requirements and reach required
Range ability really realizes that the variation of high-resolution digital potentiometer maximizes.
Specifically, in the utility model embodiment, the technique of the individual digit potentiometer is using CMOS's
Technique, because CMOS technology is more and more mature and stable in current use, production cost is low, while it is new to meet this practicality
Process requirements in type embodiment.
Specifically, in the utility model embodiment, the entire digital regulation resistance has turn-off function, should to many
For, need digital regulation resistance that there is high-impedance state when exporting, so as to which electric current be prevented to flow through digital regulation resistance, outside is facilitated to set
The standby access state that digital regulation resistance is carried out when using digital regulation resistance judges, so as to the access state according to digital regulation resistance
It is alarmed or is prompted.As shown in fig. 1, the SHDN pins of digital regulation resistance can enable the analog switch at final output end
Be switched on or off, when the analog switch at SHDN pins control final output end is closed, that is, complete entire digital current potential
The shutdown of device.
The apparatus embodiments described above are merely exemplary, wherein the unit illustrated as separating component can
To be or may not be physically separate, the component shown as unit may or may not be physics list
Member, you can be located at a place or can also be distributed in multiple network element.It can be selected according to the actual needs
In some or all of module realize the purpose of this embodiment scheme.Those of ordinary skill in the art are not paying creativeness
Labour in the case of, you can to understand and implement.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
It is realized by the mode of software plus required general hardware platform, naturally it is also possible to pass through hardware.Based on such understanding, on
Technical solution is stated substantially in other words to embody the part that the prior art contributes in the form of software product, it should
Computer software product can store in a computer-readable storage medium, such as ROM/RAM, magnetic disc, CD, including several fingers
It enables and (can be personal computer, server or the network equipment etc.) so that computer equipment is used to perform each implementation
Method described in certain parts of example or embodiment.
Finally it should be noted that：Above example is only to illustrate the technical solution of the application, rather than its limitations；Although
The application is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
To modify to the technical solution recorded in foregoing embodiments or carry out equivalent replacement to which part technical characteristic；
And these modification or replace, each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (7)
1. a kind of high-resolution digital potentiometer, which is characterized in that it includes
At least two and above unit digital regulation resistance in parallel or series, wherein each digital regulation resistance can pass through number
Its output of word Interface Controller；
Storage unit, the storage unit store the calibration data of entire high-resolution digital potentiometer；
Fixed resister, fixed resister and two and above unit digital regulation resistance are in parallel or in series.
2. high-resolution digital potentiometer according to claim 1, which is characterized in that described two and above unit numbers
Word potentiometer is in a chip interior.
3. high-resolution digital potentiometer according to claim 1, which is characterized in that described two and above unit numbers
Word potentiometer is powered using same power supply.
4. high-resolution digital potentiometer according to claim 1, which is characterized in that can also be multiple unit number electricity
The combination in parallel and serial of position device.
5. high-resolution digital potentiometer according to claim 1, which is characterized in that the unit digital regulation resistance is
CMOS technology.
6. high-resolution digital potentiometer according to claim 1, which is characterized in that the number of the unit digital regulation resistance
Word interface is SP I or I IC interfaces.
7. high-resolution digital potentiometer according to claim 1, which is characterized in that the entire high-resolution digital electricity
Position utensil has turn-off function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720909035.6U CN207490884U (en) | 2017-07-25 | 2017-07-25 | High-resolution digital potentiometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720909035.6U CN207490884U (en) | 2017-07-25 | 2017-07-25 | High-resolution digital potentiometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207490884U true CN207490884U (en) | 2018-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720909035.6U Active CN207490884U (en) | 2017-07-25 | 2017-07-25 | High-resolution digital potentiometer |
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| Country | Link |
|---|---|
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- 2017-07-25 CN CN201720909035.6U patent/CN207490884U/en active Active
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