CN202584973U - Digital adjustable resistor - Google Patents
Digital adjustable resistor Download PDFInfo
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- CN202584973U CN202584973U CN 201220245601 CN201220245601U CN202584973U CN 202584973 U CN202584973 U CN 202584973U CN 201220245601 CN201220245601 CN 201220245601 CN 201220245601 U CN201220245601 U CN 201220245601U CN 202584973 U CN202584973 U CN 202584973U
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Abstract
The utility model discloses a digital adjustable resistor, which comprises a controlled resistor string and an adjustment resistor string which are connected in parallel with each other, wherein the controlled resistor string obtains an approximate value of a required resistance value by adjusting the number of parallelly connected first resistors; and the adjustment resistor string is connected with the controlled resistor string and is used for adjusting the resistance value of the digital adjustable resistor by adjusting the number of serially connected second resistors so as to obtain the required resistance value. An adjustment method comprises the following steps of: parallelly connecting a plurality of first resistors to obtain the approximate value of the required resistance value; serially connecting a plurality of second resistors according to the required resistance value and the approximate value of the required resistance value, and adjusting the resistance value of the digital adjustable resistor; and parallelly connecting the plurality of parallelly connected first resistors and the plurality of serially connected second resistors to obtain the required resistance value. By the digital adjustable resistor and the adjustment method thereof, the resistor can be adjusted at high precision according to a small step length.
Description
Technical field
The utility model relates to the electronic circuit technology field, particularly a kind of digital adjustable resistance.
Background technology
Many circuit need the resistor of matched well, yet because process technology limit, obtainable coupling is limited usually.Need the circuit of matched well to include but are not limited to analog to digital converter (ADC) and digital to analog converter (DAC).
In order in circuit, to obtain the less resistor of resistance, can adopt usually resistance is carried out the resistance that parallelly connected mode is come regulating resistor.A kind of method for designing of bridge arm balance compensating resistance, publication number is just disclosed in being the Chinese patent of CN101275876A.Fig. 1 shows the sketch map of variable bridge arm balance compensating resistance in the prior art; With reference to figure 1; Said variable bridge arm balance compensating resistance 50 is a variable resistor, and it is formed in parallel by several resistance RmjX and several resistance RmjX that is in series with MOS switch (MOS Switch); The resistance of said resistance RmjX is 20K Europe.
Though through with a plurality of resistance and a plurality of parallelly connected modes of resistance that are in series with the MOS switch, can convert big resistance into small resistor, under this mode, the precision when realizing the long adjusting of small step is not enough, can't realize the high accuracy of resistance is regulated.
Therefore, how to realize that the little step-length of resistance, precision adjusting just become one of those skilled in the art's problem demanding prompt solution.
The utility model content
The problem that the utility model solves provides a kind of digital adjustable resistance, regulates with the little step-length, the precision that realize resistance.
For addressing the above problem; The utility model provides a kind of digital adjustable resistance; Comprise: the controlled resistor string of parallel connection and adjusting resistance string, said controlled resistor were ganged up the quantity of the first parallelly connected resistance of adjustment to draw the approximation of required resistance value, and said adjusting resistance string connects said controlled resistor string; Be used for the resistance of said digital adjustable resistance being regulated, to draw required resistance value through the quantity of adjusting second resistance of connecting.
Alternatively, said controlled resistor string comprises the branch road of a plurality of parallel connections, and each branch road comprises first electronic switch and first resistance of series connection respectively; Said adjusting resistance string comprises a plurality of second resistance and a plurality of second electronic switch; Said a plurality of second resistance is connected each other; Said second electronic switch is used to control the quantity of second resistance of connecting; When one of them second electronic switch closes, receive its control respective numbers second resistance the series connection after with said controlled circuit connection in series-parallel.
Alternatively, said first electronic switch and second electronic switch are the MOS switch.
Alternatively, the ratio of the resistance of the resistance of said first resistance and first electronic switch is more than or equal to 1000; The ratio of the resistance of the resistance of said second resistance and second electronic switch is more than or equal to 1000.
Alternatively, the resistance of said first resistance equals the resistance of said second resistance.
Alternatively; Said controlled resistor string comprises the first sub-controlled resistor string, the second sub-controlled resistor string of mutual series connection ... the sub-controlled resistor string of N; The said first sub-controlled resistor string, the second sub-controlled resistor string ... N controlled resistor string comprises the branch road of a plurality of parallel connections respectively, each branch road comprises first electronic switch and first resistance of mutual series connection respectively;
Said adjusting resistance string comprises the first son adjusting resistance string, the second adjusting resistance string of mutual series connection ... N is regulated resistance string; Said first son is regulated the resistance string and the said first sub-controlled resistor connection in series-parallel; Said second son is regulated the resistance string and the said second sub-controlled resistor connection in series-parallel ... said N is regulated resistance string and the sub-controlled resistor connection in series-parallel of said N; Wherein, N is greater than or equal to 2 natural number;
Said first son is regulated resistance string, second son is regulated resistance string ... N is regulated resistance string and comprised a plurality of second electronic switches and a plurality of second resistance respectively; Said a plurality of second resistance is connected each other; Said second electronic switch is used to control the quantity of second resistance of connecting; When one of them second electronic switch closes, receive its control respective numbers second resistance the series connection after with corresponding sub-controlled resistor connection in series-parallel.
Alternatively, when N equaled 2, the quantity of first resistance was greater than the quantity of first resistance in the sub-controlled resistor string of N in the said first sub-controlled resistor string; Said first son is regulated the quantity of the quantity of second resistance in the resistance string less than second resistance in the N adjusting resistance string.
Alternatively, the quantity of first resistance is 32 in the said first sub-controlled resistor string, and the quantity of first resistance is 8 in the sub-controlled resistor string of N; The quantity that said first son is regulated second resistance in the resistance string is 8, and the quantity that N is regulated second resistance in the resistance string is 32.
Compared with prior art, the utility model has the following advantages at least:
1) the digital adjustable resistance and the control method thereof of the utility model; Realize the approximation of required small resistor resistance through a plurality of first resistance being carried out parallelly connected controlled resistor string, and realize adjusting the resistance of digital adjustable resistance through the adjusting resistance string that a plurality of second resistance are connected.The quantity of regulating second resistance series connection in the resistance string is many more, and the step-length that can regulate is more little, thereby can accurately realize the adjusting of resistance more.
2) in the possibility, the ratio of the resistance of the resistance of said first resistance and first electronic switch is greater than 1000; The ratio of the resistance of the resistance of said second resistance and second electronic switch is greater than 1000.Like this; When first electronic switch with after first resistance is connected; Perhaps second electronic switch is with after second resistance is connected; The resistance of said first electronic switch or second electronic switch can be ignored, thereby greatly reduces its influence to first resistance and second resistance, and then has improved final adjusting result's precision.
3) in the possibility; Said controlled electronics string comprises the first sub-controlled resistor string and the sub-controlled resistor string of N of series connection; Said adjusting resistance string comprises that first son is regulated resistance string and N is regulated resistance string; Wherein, said first son is regulated the resistance string and the first sub-controlled resistor connection in series-parallel, and said N is regulated resistance string and the sub-controlled resistor connection in series-parallel of N.Through carrying out the mode of serial or parallel connection with four groups of resistance, can realize that the high accuracy of small resistor regulates with less big resistance, thereby significantly reduce the quantity of big resistance, and then reduce the chip area that takies.
Description of drawings
Fig. 1 is the sketch map of variable bridge arm balance compensating resistance in the prior art;
Fig. 2 is the sketch map of the embodiment one of the utility model numeral adjustable resistance;
Fig. 3 is the sketch map of the embodiment two of the utility model numeral adjustable resistance;
Fig. 4 ~ Fig. 5 is the simulation result to digital adjustable resistance shown in Figure 3.
Embodiment
In current integrated circuit technology, realize that directly the resistance of ohm unit need take very big silicon area, cost is very high; The conducting resistance of common in addition MOS switch is also very big, about tens ohm, therefore, can not be only a MOS switch and other resistance of ohm level be connected and realizes the variable resistor of a little step-length.
In the prior art,, can the big resistance of One's name is legion be carried out parallel connection in order to realize small resistor (resistance of the tens Europe orders of magnitude), for example, in order to realize the small resistor in 20 Europe, can be with the resistance parallel connection in 100 20K Europe.But the degree of regulation of the resistance string of this structure is not enough, can't realize the high accuracy adjusting to resistance, thereby has influenced the matching degree and the performance of circuit.
In the utility model; The numeral adjustable resistance comprises the controlled resistor string and regulates resistance string; Said controlled resistor string is used to draw the approximation of required resistance value; Said adjusting resistance is parallelly connected with said controlled resistor, and through the quantity of adjusting second resistance of connecting the resistance of said digital adjustable resistance is regulated, to draw required resistance value.In the utility model, can draw the approximation of required resistance value through the quantity of first resistance of parallel connection in the adjustment controlled resistor string, can draw more accurate resistance value to satisfy the demands through the further adjusting of regulating the economize on electricity string again.Realized long adjusting of high accuracy, small step of resistance through such mode.
For above-mentioned purpose, the feature and advantage that make the utility model can be more obviously understandable, the embodiment of the utility model is done detailed explanation below in conjunction with accompanying drawing.
Set forth detail in the following description so that make much of the utility model.But the utility model can be different from alternate manner described here and implements with multiple, and those skilled in the art can do similar popularization under the situation of the utility model intension.Therefore the utility model does not receive the restriction of following disclosed embodiment.
Embodiment one
Fig. 2 shows the sketch map of the embodiment one of the utility model numeral adjustable resistance.With reference to figure 2, said digital adjustable resistance comprises: controlled resistor string 10 and adjusting resistance string 20.Said controlled resistor string 10 is parallelly connected with adjusting resistance string 20.
Wherein, the quantity of first resistance 102 of said controlled resistor string 10 through adjusting parallel connection is to draw the approximation of required resistance value.Said adjusting resistance string 20 is parallel to said controlled resistor string 10, is used for through the quantity of adjusting second resistance 202 of connecting the resistance of said digital adjustable resistance being regulated, to draw required resistance value.
Particularly; In the present embodiment; Said controlled resistor string 10 is adjusted the quantity of first resistance 102 of parallel connection through a plurality of first electronic switches 101; Each first electronic switch 101 is connected with one first resistance 102 respectively, and first electronic switch 101 after the series connection and first resistance 102 are formed a branch road, constitute said controlled resistor string 10 after each branch road parallel connection.
Said adjusting resistance string 20 is adjusted the quantity of second resistance 202 of series connection through a plurality of second electronic switches 201, and each second electronic switch 201 is connected with one second resistance 202 respectively.
Particularly; Continuation is with reference to figure 2; Second end that will be arranged in second electronic switch 201 of regulating resistance string 20 low order ends is designated node A; Second end of second electronic switch 201 that is close to node A is designated Node B, and second end that will be arranged in second electronic switch 201 of regulating resistance string 20 high order ends is designated node C.Second end that will be positioned at second resistance 202 of regulating resistance string 20 low order ends is designated node D, and second end of second resistance 202 on next-door neighbour's node D left side is designated node E.
The concrete connected mode of second resistance 202 and second electronic switch 201 is in the said adjusting resistance string 20: first end of each second electronic switch 201 interconnects and is connected to jointly first end of controlled resistor string 10; Corresponding respectively first end that connects one second resistance 202 of second end of each second electronic switch 201.Each second resistance 202 is connected successively, just first end of back one second resistance 202 is connected to second end of next-door neighbour's previous second resistance 202, and the like, second end of last second resistance 202 is connected to second end of controlled resistor string 10.
Particularly, in the embodiment shown in Figure 2, second end (being node D) that is positioned at second resistance 202 of said adjusting resistance string 20 low order ends is connected to second end of controlled resistor string 10.
Said second electronic switch 201 is used to control the quantity of second resistance 202 of connecting; When one of them second electronic switch 201 was closed, second resistance 202 of respective numbers that receives its control was parallelly connected with said controlled circuit string 10 after series connection.
When regulating, can only there be one second electronic switch 201 to be closed at every turn.When second electronic switch 201 that links to each other with node A is closed, carry out parallelly connected with said controlled resistor string 10 with its corresponding second resistance 202 (second resistance 202 that promptly links to each other) of regulating resistance string 20 low order ends that is positioned at node D; When second electronic switch 201 that links to each other with Node B was closed, second resistance 202 that links to each other with node D was connected earlier with second resistance 202 that links to each other with node E, carries out parallelly connected with said controlled resistor string 10 then; Correspondingly, when second electronic switch 201 that links to each other with node C was closed, all second resistance 202 of regulating in the resistance string 20 were all connected, and carry out parallelly connected with said controlled resistor string 10 then.
In the present embodiment, said first electronic switch 101 and second electronic switch 201 are the MOS switch.Certainly, it should not limit the protection range of the utility model, in other embodiments, can adopt any one electronic switch in the prior art to adjust the quantity of second resistance 202 of quantity or series connection of first resistance 102 of parallel connection yet.
In the present embodiment, the ratio of the resistance of the resistance of said first resistance 102 and first electronic switch 101 is more than or equal to 1000.The ratio of the resistance of the resistance of said second resistance 202 and second electronic switch 201 is more than or equal to 1000.
At the order of magnitude in tens Europe, in order to reduce the influence of MOS switch to the resistance of controlled resistor string 10 as much as possible, the value of said first resistance 102 can be on tens kilo-ohms the order of magnitude usually for the resistance value of MOS switch.Like this; For first resistance 102; The resistance of said first electronic switch 101 can be ignored, thereby can reduce the influence of the resistance of 101 pairs of controlled resistor strings 10 of first electronic switch, makes said controlled resistor string 10 can more accurately adjust resistance.
Similarly, the value of said second resistance 202 also can be on tens kilo-ohms the order of magnitude.In the present embodiment; The resistance of said first resistance 102 equals the resistance of said second resistance 202; Particularly, the resistance of said first resistance 102 and second resistance 202 can be 10 kilo-ohms, and this value is merely and illustrates certainly; In other embodiments, also can select the resistance of other resistances according to actual needs.
The operation principle of the utility model numeral adjustable resistance is described below in conjunction with instantiation.
As a concrete example, suppose that at first the quantity of maximum first resistance 102 that can be parallelly connected in the said controlled resistor string 10 is 256, the quantity of maximum second resistance 202 that can connect is 256 in the said adjusting resistance string 20.The resistance of said first resistance 102 and second resistance 202 is 10 kilo-ohms, and the resistance of first electronic switch 101 and second electronic switch 201 is 10 Europe, and the small resistor of required generation is 60 Europe.
In order to realize required small resistor (60 Europe), can earlier first resistance 102 of the part in the controlled resistor string 10 be carried out parallel connection, be about to part first electronic switch 101 closures.For example, in this example, can be earlier with 166 first electronic switch 101 closures, thus realize the parallel connection of corresponding 166 first resistance 102.Like this, said controlled resistor string 10 promptly obtains the approximation (10 kilo-ohms/166 approximate 60.24 Europe) of required small resistor.
Then, carry out meticulous adjusting through the approximation (approximating 60.24 Europe) of regulating the required small resistor that 20 pairs of said controlled resistor strings 10 of resistance string draw again.That is to say, will regulate a part second resistance 202 series connection in the resistance string 20 again, then with controlled resistor string 10 carry out parallelly connected, finally to draw required small resistor value 60 Europe.
The regulating step of above-mentioned realization small resistor is merely and illustrates, and in practical operation, can repeatedly regulate, and compare, thereby select the best implementation near required small resistor.
Certainly, receive on the one hand the influence of first electronic switch 101 and second electronic switch 201, receive the influence of the quantity of first resistance 102, second resistance 202 on the other hand, the resistance value that finally draws can not be equal to required small resistor value 60 Europe.But compared with prior art, the resistance value of this embodiment gained is more accurate, and its degree of regulation is higher.
Utility model people is through experimental verification repeatedly; In above-mentioned giving an example; Said digital adjustable resistance can be realized the adjusting of 256 step-lengths, and degree of regulation can reach ± 0.5LSB, and wherein LSB refers to the adjusting step-length of resistance here; The resistance that at every turn can regulate when in other words, said LSB refers to resistance regulated.That is to say that the degree of regulation of the digital adjustable resistance in the present embodiment can be controlled in the half the scope of regulating step-length.
Below be merely convenient explanation for example, it should not limit the protection range of the utility model, in other embodiments, can make other simple modifications or replacement according to the protection spirit of the utility model.
In the present embodiment; Realize the approximation of required small resistor resistance through the controlled resistor string 10 that a plurality of big resistance (first resistance 102) is carried out parallel connection; Realize adjusting through the adjusting resistance string 20 that a plurality of big resistance (second resistance 202) are connected then to the resistance of digital adjustable resistance; Thereby realized regulating, also improved the degree of regulation of resistance the small step of small resistor is long.
Embodiment two
Fig. 3 shows the sketch map of the embodiment two of the utility model numeral adjustable resistance.With reference to figure 3, said digital adjustable resistance comprises: controlled resistor string 10 and adjusting resistance string 20.Said controlled resistor string 10 is parallelly connected with adjusting resistance string 20.
Compare with embodiment one, the difference of present embodiment is: said controlled resistor string 10 comprises the first sub-controlled resistor string 110 and the second sub-controlled resistor string 120 of mutual series connection.Said adjusting resistance string 20 comprises that first son of mutual series connection is regulated resistance string 210 and second son is regulated resistance string 220.And the said first sub-controlled resistor string 110 and first son are regulated resistance string 210 parallel connections; The said second sub-controlled resistor string 120 and second son are regulated resistance string 220 parallel connections.
Particularly, the said first sub-controlled resistor string 110 and the second sub-controlled resistor string 120 comprise the branch road of a plurality of parallel connections respectively, and each branch road comprises first electronic switch 101 and first resistance 102 of mutual series connection respectively.
Said first son regulates resistance string 210 and the second son adjusting resistance string 220 comprises a plurality of second electronic switches 201 and a plurality of second resistance 202 respectively; Said a plurality of second resistance 202 is connected each other; Said second electronic switch 201 is used to control the quantity of second resistance 202 of connecting; When one of them second electronic switch 201 is closed, second resistance 202 of respective numbers that receives its control after series connection with corresponding sub-controlled resistor connection in series-parallel.
Particularly, with reference to figure 3, regulate one second electronic switch 201 in the resistance string 210 when closed when said first son, second resistance 202 of respective numbers that receives its control is parallelly connected with the said first sub-controlled resistor string 110 after series connection.
Similarly, said second son is regulated one second electronic switch 201 in the resistance string 220 when closed, and second resistance 202 of respective numbers that receives its control is parallelly connected with the said second sub-controlled resistor string 120 after series connection.
Similar in the present embodiment among the connected mode of each second electronic switch 201 and second resistance 202 and the embodiment one is so repeat no more at this.
Preferably, in the said first sub-controlled resistor string 110 quantity of first resistance 102 greater than the quantity of first resistance 102 in the second sub-controlled resistor string 120.And said first son is regulated the quantity of the quantity of second resistance 202 in the resistance string 210 less than second resistance 202 in the second son adjusting resistance string 220.
In the present embodiment, the quantity of first resistance 102 is 32 in the said first sub-controlled resistor string 110, and the quantity of first resistance 102 is 8 in the second sub-controlled resistor string 120; The quantity that said first son is regulated second resistance 202 in the resistance string 210 is 8, and the quantity that second son is regulated second resistance 202 in the resistance string 220 is 32.
Under such setting, the digital adjustable resistance of present embodiment can be realized the adjusting of 256 step-lengths, and the quantity of required resistance significantly reduces, thereby can reduce to take area of chip, improves the integration of circuit.
When adopting the framework realization resistance adjustment of embodiment two, at first need regulate the first sub-controlled resistor string 110 and the second sub-controlled resistor string 120 respectively.Draw the approximation of required resistance through the closure of electronic switch in these two resistance string.Particularly, at first distribute the resistance of the first sub-controlled resistor string 110 and the resistance of the second sub-controlled resistor string 120 according to required resistance value.And then regulate first son respectively and regulate the resistance string 210 and the second son adjusting resistance string 220, to realize meticulous adjusting to the resistance of digital adjustable resistance.Said first son is regulated resistance string 210 and said second son and is regulated similar among adjustment process and the embodiment one of resistance string 220, so repeat no more at this.
Through can drawing the resistance near required resistance value easily to repeatedly regulating of these four groups of resistance string, thereby the adjustment state during with immediate resistance is as best implementation.In the present embodiment, only need the connection in series-parallel of each resistance in four groups of resistance string can realize the little step-length of resistance, high-precision adjusting.
Fig. 4 and Fig. 5 are the simulation results to digital adjustable resistance shown in Figure 3.
With reference to figure 4, what its abscissa was represented is the theoretical unit resistance value, and what ordinate was represented is the unitary resistance value of the actual output of digital adjustable resistance in the present embodiment.In the present embodiment, said digital adjustable resistance can be realized the adjusting of 256 step-lengths, and what the scale 40/256 on Fig. 4 abscissa was represented is the unitary resistance value that should draw in theory when regulating 40 step-lengths.
Can find out that through Fig. 4 the digital adjustable resistance of present embodiment can realize the linearity output of resistance value, in other words, the digital adjustable resistance of present embodiment can be realized the meticulous adjusting of resistance.
With reference to figure 5, what its abscissa was represented is the theoretical unit resistance value, and that ordinate is represented is actual resistance and the INL between the theoretical resistance (integral non-linear error) that draws through digital adjustable resistance in the present embodiment.Said INL is an important parameters of gauge resistor resistance accuracy, refers to the deviation between output resistance and the ideal resistance.
As shown in Figure 5, the maximum INL (integral non-linear error) of the digital adjustable resistance of present embodiment is about 0.06LSB.
Normally, the INL of acceptable resistance is in being less than or equal to the scope of 0.5LSB.And the utility model people shows through Fig. 5 that analog simulation draws, and the INL of the digital adjustable resistance of present embodiment (about 0.06LSB) is far smaller than acceptable scope (0.5LSB), thereby the high accuracy that has realized resistance is regulated.That is to say that the precision of each resistance that the digital adjustable resistance of employing present embodiment adjusts is higher.
Need to prove,, regulate resistance string and only comprise two son adjusting resistance string though among the embodiment shown in Figure 3, said controlled resistor string only comprises two sub-controlled resistor strings; But the utility model does not limit this, and in other embodiments, said controlled resistor string can also comprise the sub-resistance string more than three or three with the adjusting resistance string.
Correspondingly, the utility model also provides a kind of control method of digital adjustable resistance.Said method comprises: with a plurality of first resistance parallel connections to draw the approximation of required resistance value; According to the approximation of required resistance value and said required resistance value, a plurality of second resistance series connection are regulated the resistance of said digital adjustable resistance with realization; With first resistance of a plurality of parallel connections and a plurality of second resistance parallel connections of connecting to draw required resistance value.
In the method for the utility model; Through a plurality of first resistance being carried out parallel connection to draw the approximation of required small resistor resistance; And then through the mode of a plurality of second resistance series connection is carried out meticulous adjusting to digital adjustable resistance, thereby finally draw required resistance value.The quantity of second resistance series connection is many more, and the step-length that can regulate is just more little, thereby can realize the meticulous adjusting of resistance more.Can realize the little step-length of resistance, meticulous adjusting through the method for the utility model.
Though the utility model with preferred embodiment openly as above; But it is not to be used for limiting the utility model; Any those skilled in the art are in spirit that does not break away from the utility model and scope; Can utilize the method and the technology contents of above-mentioned announcement that the utility model technical scheme is made possible change and modification, therefore, every content that does not break away from the utility model technical scheme; To any simple modification, equivalent variations and modification that above embodiment did, all belong to the protection range of the utility model technical scheme according to the technical spirit of the utility model.
Claims (8)
1. digital adjustable resistance; It is characterized in that; Comprise: the controlled resistor string of parallel connection and adjusting resistance string, said controlled resistor were ganged up the quantity of the first parallelly connected resistance of adjustment to draw the approximation of required resistance value, and said adjusting resistance string connects said controlled resistor string; Be used for the resistance of said digital adjustable resistance being regulated, to draw required resistance value through the quantity of adjusting second resistance of connecting.
2. digital adjustable resistance as claimed in claim 1 is characterized in that said controlled resistor string comprises the branch road of a plurality of parallel connections, and each branch road comprises first electronic switch and first resistance of series connection respectively; Said adjusting resistance string comprises a plurality of second resistance and a plurality of second electronic switch; Said a plurality of second resistance is connected each other; Said second electronic switch is used to control the quantity of second resistance of connecting; When one of them second electronic switch closes, receive its control respective numbers second resistance the series connection after with said controlled circuit connection in series-parallel.
3. digital adjustable resistance as claimed in claim 2 is characterized in that, said first electronic switch and second electronic switch are the MOS switch.
4. digital adjustable resistance as claimed in claim 2 is characterized in that, the ratio of the resistance of the resistance of said first resistance and first electronic switch is more than or equal to 1000; The ratio of the resistance of the resistance of said second resistance and second electronic switch is more than or equal to 1000.
5. digital adjustable resistance as claimed in claim 2 is characterized in that the resistance of said first resistance equals the resistance of said second resistance.
6. digital adjustable resistance as claimed in claim 1; It is characterized in that; Said controlled resistor string comprises the first sub-controlled resistor string, the second sub-controlled resistor string of mutual series connection ... the sub-controlled resistor string of N; The said first sub-controlled resistor string, the second sub-controlled resistor string ... N controlled resistor string comprises the branch road of a plurality of parallel connections respectively, each branch road comprises first electronic switch and first resistance of mutual series connection respectively;
Said adjusting resistance string comprises the first son adjusting resistance string, the second adjusting resistance string of mutual series connection ... N is regulated resistance string; Said first son is regulated the resistance string and the said first sub-controlled resistor connection in series-parallel; Said second son is regulated the resistance string and the said second sub-controlled resistor connection in series-parallel ... said N is regulated resistance string and the sub-controlled resistor connection in series-parallel of said N; Wherein, N is greater than or equal to 2 natural number;
Said first son is regulated resistance string, second son is regulated resistance string ... N is regulated resistance string and comprised a plurality of second electronic switches and a plurality of second resistance respectively; Said a plurality of second resistance is connected each other; Said second electronic switch is used to control the quantity of second resistance of connecting; When one of them second electronic switch closes, receive its control respective numbers second resistance the series connection after with corresponding sub-controlled resistor connection in series-parallel.
7. digital adjustable resistance as claimed in claim 6 is characterized in that, when N equaled 2, the quantity of first resistance was greater than the quantity of first resistance in the sub-controlled resistor string of N in the said first sub-controlled resistor string; Said first son is regulated the quantity of the quantity of second resistance in the resistance string less than second resistance in the N adjusting resistance string.
8. digital adjustable resistance as claimed in claim 7 is characterized in that, the quantity of first resistance is 32 in the said first sub-controlled resistor string, and the quantity of first resistance is 8 in the sub-controlled resistor string of N; The quantity that said first son is regulated second resistance in the resistance string is 8, and the quantity that N is regulated second resistance in the resistance string is 32.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220245601 CN202584973U (en) | 2012-05-28 | 2012-05-28 | Digital adjustable resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220245601 CN202584973U (en) | 2012-05-28 | 2012-05-28 | Digital adjustable resistor |
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| CN202584973U true CN202584973U (en) | 2012-12-05 |
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| CN 201220245601 Expired - Lifetime CN202584973U (en) | 2012-05-28 | 2012-05-28 | Digital adjustable resistor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102693796A (en) * | 2012-05-28 | 2012-09-26 | 上海丽恒光微电子科技有限公司 | Digital adjustable resistor and adjusting method thereof |
| CN103277564A (en) * | 2013-06-06 | 2013-09-04 | 贵州师范大学 | High-speed electromagnetic switching valve with fast discharging circuit |
| CN103277563A (en) * | 2013-06-06 | 2013-09-04 | 贵州师范大学 | Quick opening and closing method of high-speed electromagnetic switch valve |
-
2012
- 2012-05-28 CN CN 201220245601 patent/CN202584973U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102693796A (en) * | 2012-05-28 | 2012-09-26 | 上海丽恒光微电子科技有限公司 | Digital adjustable resistor and adjusting method thereof |
| CN103277564A (en) * | 2013-06-06 | 2013-09-04 | 贵州师范大学 | High-speed electromagnetic switching valve with fast discharging circuit |
| CN103277563A (en) * | 2013-06-06 | 2013-09-04 | 贵州师范大学 | Quick opening and closing method of high-speed electromagnetic switch valve |
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