CN102543337A - Numerical control rheostat based on weighting switching network - Google Patents
Numerical control rheostat based on weighting switching network Download PDFInfo
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- CN102543337A CN102543337A CN2011103867541A CN201110386754A CN102543337A CN 102543337 A CN102543337 A CN 102543337A CN 2011103867541 A CN2011103867541 A CN 2011103867541A CN 201110386754 A CN201110386754 A CN 201110386754A CN 102543337 A CN102543337 A CN 102543337A
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Abstract
The invention discloses a numerical control rheostat based on a weighting switching network, which comprises the weighting switching network and a numerical control resistor. The weighting switching network receives an N bit binary digital signals, the N is a positive integer, the numerical control resistor comprises 2N resistors which have equal ohms and are sequentially connected in series, the weighting switching network comprises N analogue switches, each analogue switch receives one bit binary digital signals, obtains respective weight according to weight of the received binary digital signal and then is in parallel connection with the resistors which have the quantity equal to the weight and are sequentially in series connection, and each resistor is in parallel connection with one analogue switch at most. The numerical control variable resistance can be achieved by the weighting switching network formed by the N analogue switches only, and cost is greatly reduced.
Description
Technical field
The present invention relates to a kind of numerical control rheostat, relate in particular to a kind of numerical control rheostat based on the weighting switching network.
Background technology
See also Fig. 1, present numerical control rheostat generally is with N bit binary number signal D
N-1～D
0Through N-2
NDecoder 1 ' produces 2
NSelect 1 switch controlling signal Y (2
N-1)～and Y0, control analog switch K (2 respectively
N-1) '～and K0 ', resistance value (the resistance value R between A, B of realization digit-control resistance 2 '
AB) with N bit binary number signal D
N-1～D
0Variation and change, wherein, digit-control resistance 2 ' is 2
NIndividual resistance equates and the resistance R of series connection successively and the two ends of digit-control resistance 2 ' are respectively A, B two ends; 2
NIndividual analog switch K (2
N-1) '～and a K0 ' end separately connects a resistance R respectively, connects the B end after the other end separately links to each other successively, thus realize resistance value (the resistance value R between A, B of digit-control resistance 2 '
AB) can be from R to 2
NVariation between the R.Yet this numerical control rheostat needs N-2
NDecoder and 2
NIndividual analog switch, cost is higher, and it is bigger to make chip area.
Summary of the invention
The objective of the invention is to overcome the defective of prior art and a kind of numerical control rheostat based on the weighting switching network is provided; Be directed to N bit binary number signal; The weighting switching network that the present invention only needs N analog switch to form just can be realized the numerical control variable resistor, greatly reduces cost.
The technical scheme that realizes above-mentioned purpose is:
A kind of numerical control rheostat based on the weighting switching network, this numerical control rheostat comprises a weighting switching network and a digit-control resistance, and said weighting switching network receives N bit binary number signal, and N is a positive integer, wherein:
Said digit-control resistance comprises 2
NThe resistance that individual resistance equates and connects successively;
Said weighting switching network comprises N analog switch; Each analog switch receives a bit binary number signal; And according to the residing power of the binary digital signal that is received; Obtain weight separately, then with the some resistance parallel connections that equal the quantity of weight and connect successively, and each resistance is at most parallelly connected with an analog switch.
Above-mentioned numerical control rheostat based on the weighting switching network, wherein, a said N analog switch is respectively first to the N analog switch, receives first successively respectively to N bit binary number signal, wherein:
The M analog switch receives M bit binary number signal, and 1≤M≤N and M are positive integer, and said M weight that analog switch obtains is 2
M-1, in this M analog switch and the said digit-control resistance 2
M-1The individual resistance parallel connection of series connection successively, and this 2
M-1Any resistance in the individual resistance is all not parallelly connected with other analog switches.
Above-mentioned numerical control rheostat based on the weighting switching network, wherein, in the said digit-control resistance successively the series connection 2
NIndividual resistance is called after first to the 2nd respectively
NResistance, wherein, connect successively in M analog switch and the said digit-control resistance the 2nd
M-1+ 1 to the 2nd
MThe resistance parallel connection.
The invention has the beneficial effects as follows: the present invention directly realizes that with the switching network of weighting numerical control becomes resistance, removes the N-2 that needs in the prior art from
NDecoder, and reduced the quantity of analog switch, being directed to N bit binary number signal, the resistance value that the weighting switching network that only needs N analog switch to form just can be regulated digit-control resistance has reduced the making chip area, greatly reduces cost.
Description of drawings
Fig. 1 is the rheostatic circuit diagram of N position binary coding numerical control of prior art;
Fig. 2 is the rheostatic circuit diagram of N of the present invention position binary coding numerical control;
Fig. 3 a and Fig. 3 b are respectively 3 rheostatic practical circuit diagram of binary coding numerical control among prior art and the present invention;
Fig. 4 a and Fig. 4 b are respectively 4 rheostatic practical circuit diagram of binary coding numerical control among prior art and the present invention;
Fig. 5 is the physical circuit figure of analog switch;
Fig. 6 is the physical circuit figure of not gate (IV);
Fig. 7 is the physical circuit figure of three input NOR gates (NR3);
Fig. 8 is the physical circuit figure of four input NOR gates (NR4);
Fig. 9 is the analogous diagram of the resistance of digit-control resistance in prior art and the present invention's 3 the binary coding numerical control rheostats separately corresponding to digital signal;
Figure 10 is the analogous diagram of the resistance of digit-control resistance in prior art and the present invention's 4 the binary coding numerical control rheostats separately corresponding to digital signal.
Embodiment
To combine accompanying drawing that the present invention is described further below.
See also Fig. 2, the numerical control rheostat based on the weighting switching network of the present invention comprises weighting switching network 1 and digit-control resistance 2, and weighting switching network 1 receives N bit binary number signal D
N-1～D
0, N is a positive integer,
Digit-control resistance 2 comprises 2
NThe resistance R that individual resistance equates and connects successively;
Specifically, N analog switch K (N-1)～K0 is respectively first to N analog switch K0～K (N-1), receives first successively respectively to N bit binary number signal D
0～D
N-1, wherein:
M analog switch K (M-1) receives M bit binary number signal D
M-1, 1≤M≤N and M are positive integer, therefore, M analog switch K (M-1) weight that obtains is 2
M-1, in this M analog switch K (M-1) and the digit-control resistance 22
M-1The individual resistance R parallel connection of series connection successively, and this 2
M-1Any resistance R in the individual resistance R is all not parallelly connected with other analog switches.
More particularly, among Fig. 2, in the digit-control resistance 2 successively the series connection 2
NIndividual resistance is called after first to the 2nd respectively
NResistance, wherein, M analog switch K (M-1) with connect successively the 2nd
M-1+ 1 to the 2nd
MThe resistance parallel connection; Perhaps M analog switch K (M-1) with connect successively the 2nd
M-1To the 2nd
MThe parallel connection of-1 resistance.
Among the present invention, because figure place (N position) difference of the binary digital signal that receives, the designing requirement of digit-control resistance 2 is also inequality, thereby the numerical control rheostat that is obtained also is not quite similar, and below divides two embodiment to explain:
First embodiment:
See also Fig. 3 a and Fig. 3 b, be respectively 3 rheostatic practical circuit diagram of binary coding numerical control among prior art and the present invention.Among Fig. 3 a, ((I20～I27) waits composition 3-8 decoder to not gate for I0～I2, I10～I17), three input NOR gates.
Because receive 3 bit binary number signal D2～D0, the designing requirement of digit-control resistance 2 such as following table 1:
| D2～D0 | Digit-control resistance resistance R AB |
| 000 | R |
| 001 | 2R |
| 010 | 3R |
| 011 | 4R |
| 100 | 5R |
| 101 | 6R |
| 110 | |
| 111 | 8R |
Table 1
Can know that from table 1 digit-control resistance 2 is designed to eight resistance R 0-R7 that resistance equates and connects successively, and the two ends of digit-control resistance 2 are A, B two ends, then the resistance value of digit-control resistance 2 is R
AB Weighting switching network 1 is first, second and the 3rd analog switch K0～K2 of series connection successively; Three analog switch K0～corresponding 3 bit binary number signals of K2 difference, the weight that obtains is respectively 1,2,4, and is then parallelly connected with 1,2,4 resistance respectively; Parallel way is not limit, and Fig. 3 b is a kind of for wherein:
The first analog switch K0 receives the first position digital signal D0, and the weight that obtains is 1, and this first analog switch K0 is parallelly connected with second resistance R 1;
The second analog switch K1 receives second-order digit signal D1, and the weight that obtains is 2, and this second analog switch K1 and the 3rd to the 4th resistance R 2, R3 are parallelly connected;
The 3rd analog switch K2 receives the 3rd position digital signal D2, and the weight that obtains is that 4, the three analog switch K2 are parallelly connected with the 5th to the 8th resistance R 4-R7.
Existing 3 rheostatic circuit of binary coding numerical control (Fig. 3 a) with the logic true value such as the following table 2 of the first embodiment circuit (Fig. 3 b):
Table 2
The resistance of supposing the resistance R 0-R7 among Fig. 3 a and Fig. 3 b is 20K ohm, and maximum current is 10uA between A, B end, then existing 3 rheostatic circuit of binary coding numerical control (Fig. 3 a) with the simulation result such as the following table 3 of the first embodiment circuit (Fig. 3 b):
Table 3
See also Fig. 9, be the resistance of digit-control resistance in prior art and the present invention's 3 the binary coding numerical control rheostats separately analogous diagram corresponding to 3 position digital signals.Among the figure, solid line representes that (Fig. 3 a), dotted line is represented the first embodiment circuit (Fig. 3 b) to existing 3 rheostatic circuit of binary coding numerical control.
Can know that by table 2, table 3 and Fig. 9 the first embodiment circuit (Fig. 3 b) can reach that (Fig. 3 is identical functions and close performance a), can meet design requirement fully with existing 3 rheostatic circuit of binary coding numerical control.
Second embodiment:
See also Fig. 4 a and Fig. 4 b, be respectively 4 rheostatic practical circuit diagram of binary coding numerical control among prior art and the present invention.Among Fig. 4 a, ((I30～I45) waits composition 4-16 decoder to not gate for I0～I3, I10～I25), four input NOR gates.
Because receive 4 bit binary number signal D3～D0; So digit-control resistance 2 is designed to 16 resistance R 0-R15 that resistance equates and connects successively, and the two ends of digit-control resistance 2 are A, B two ends, then the resistance value of digit-control resistance 2 is RAB; Weighting switching network 1 is the first, second, third and the 4th analog switch K0～K3 that connects successively; Four analog switch K0～corresponding 4 bit binary number signals of K3 difference, the weight that obtains is respectively 1,2,4,8, and is then parallelly connected with 1,2,4,8 resistance respectively; Parallel way is not limit, and Fig. 3 b is a kind of for wherein:
The first analog switch K0 receives the first position digital signal D0, and the weight that obtains is 1, and this first analog switch K0 is parallelly connected with second resistance R 1;
The second analog switch K1 receives second-order digit signal D1, and the weight that obtains is 2, and this second analog switch K1 and the 3rd to the 4th resistance R 2, R3 are parallelly connected;
The 3rd analog switch K2 receives the 3rd position digital signal D2, and the weight that obtains is that 4, the three analog switch K2 are parallelly connected with the 5th to the 8th resistance R 4-R7;
The 4th analog switch K3 receives 4-digit number signal D3, and the weight that obtains is that 8, the four analog switch K3 are parallelly connected with the 9th to the 16 resistance R 8-R15.
Therefore, the logic true value table of the designing requirement of digit-control resistance 2 and analog switch K0～K3 such as following table 4:
Table 4
The resistance of supposing the resistance R 0-R15 among Fig. 4 a and Fig. 4 b is 20K ohm, and maximum current is 10uA between A, B end, then existing 4 rheostatic circuit of binary coding numerical control (Fig. 4 a) with the simulation result such as the following table 5 of the second embodiment circuit (Fig. 4 b):
Table 5
See also Figure 10, be the resistance of digit-control resistance in prior art and the present invention's 4 the binary coding numerical control rheostats separately analogous diagram corresponding to 4 position digital signals.Among the figure, solid line representes that (Fig. 4 a), dotted line is represented the second embodiment circuit (Fig. 4 b) to existing 4 rheostatic circuit of binary coding numerical control.
Can know that by table 4, table 5 and Figure 10 the second embodiment circuit (Fig. 4 b) can reach that (Fig. 4 is identical functions and close performance a), meets design requirement fully with existing 4 rheostatic circuit of binary coding numerical control.
See also Fig. 5, be the physical circuit figure of analog switch.Specifically, each analog switch comprises power supply VDD, PMOS pipe M0, NMOS pipe M1, the 2nd PMOS pipe M2 and the 2nd NMOS pipe M3, wherein:
The node that the grid of the grid of the one PMOS pipe M0 and NMOS pipe M1 links to each other receives the one-bit digital signal, and this node connects the grid of the 2nd PMOS pipe M2; The node that the drain electrode of the drain electrode of the one PMOS pipe M0 and NMOS pipe M1 links to each other is connected the grid of the 2nd NMOS pipe M3; The one PMOS pipe M0 source electrode all be connected power supply VDD with substrate; The one NMOS pipe M1 source electrode and the equal ground connection of substrate;
The 2nd PMOS manages the drain electrode of M2 and the output of end as analog switch that link to each other of the source electrode of the 2nd NMOS pipe M3; The 2nd PMOS manages the source electrode of M2 and end another output as analog switch that links to each other of the drain electrode of the 2nd NMOS pipe M3; The substrate of the 2nd PMOS pipe M2 connects power supply VDD; The substrate ground connection of the 2nd NMOS pipe M3.
Fig. 6 is the physical circuit figure of not gate, and Fig. 7 is the physical circuit figure of three input NOR gates (NR3), and Fig. 8 is the physical circuit figure of four input NOR gates (NR4).
In sum, the present invention has significantly reduced chip area owing to reduced analog switch quantity and removed decoder circuit from, has reduced cost, and can reach and existing numerical control rheostat identical functions and close performance, can meet design requirement fully.
Above embodiment only supplies to explain the present invention's usefulness; But not limitation of the present invention; The technical staff in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification; Therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited each claim.
Claims (3)
1. the numerical control rheostat based on the weighting switching network is characterized in that, this numerical control rheostat comprises a weighting switching network and a digit-control resistance, and said weighting switching network receives N bit binary number signal, and N is a positive integer, wherein:
Said digit-control resistance comprises 2
NThe resistance that individual resistance equates and connects successively;
Said weighting switching network comprises N analog switch; Each analog switch receives a bit binary number signal; And according to the residing power of the binary digital signal that is received; Obtain weight separately, then with the some resistance parallel connections that equal the quantity of weight and connect successively, and each resistance is at most parallelly connected with an analog switch.
2. the numerical control rheostat based on the weighting switching network according to claim 1 is characterized in that a said N analog switch is respectively first to the N analog switch, receives first successively respectively to N bit binary number signal, wherein:
The M analog switch receives M bit binary number signal, and 1≤M≤N and M are positive integer, and said M weight that analog switch obtains is 2
M-1, in this M analog switch and the said digit-control resistance 2
M-1The individual resistance parallel connection of series connection successively, and this 2
M-1Any resistance in the individual resistance is all not parallelly connected with other analog switches.
3. the numerical control rheostat based on the weighting switching network according to claim 2 is characterized in that, in the said digit-control resistance successively the series connection 2
NIndividual resistance is called after first to the 2nd respectively
NResistance, wherein, connect successively in M analog switch and the said digit-control resistance the 2nd
M-1+ 1 to the 2nd
MThe resistance parallel connection.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407655A (en) * | 2014-12-01 | 2015-03-11 | 北京机械设备研究所 | Resistance adjusting program control method |
| WO2018014628A1 (en) * | 2016-07-19 | 2018-01-25 | 京东方科技集团股份有限公司 | Conversion circuit and operating method thereof, compensation device and display device |
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| CN2108955U (en) * | 1991-12-30 | 1992-07-01 | 王建华 | Popularized digital dc voltage stabilizing power supply |
| CN101094769A (en) * | 2004-11-03 | 2007-12-26 | 富士胶卷迪马蒂克斯股份有限公司 | Individual voltage trimming with waveforms |
| CN201667264U (en) * | 2009-09-08 | 2010-12-08 | 张晓军 | Digital coding high-power variable resistor |
| CN202332456U (en) * | 2011-11-29 | 2012-07-11 | 上海贝岭股份有限公司 | Numerical control rheostat based on weighing switching network |
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2011
- 2011-11-29 CN CN2011103867541A patent/CN102543337A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2108955U (en) * | 1991-12-30 | 1992-07-01 | 王建华 | Popularized digital dc voltage stabilizing power supply |
| CN101094769A (en) * | 2004-11-03 | 2007-12-26 | 富士胶卷迪马蒂克斯股份有限公司 | Individual voltage trimming with waveforms |
| CN201667264U (en) * | 2009-09-08 | 2010-12-08 | 张晓军 | Digital coding high-power variable resistor |
| CN202332456U (en) * | 2011-11-29 | 2012-07-11 | 上海贝岭股份有限公司 | Numerical control rheostat based on weighing switching network |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407655A (en) * | 2014-12-01 | 2015-03-11 | 北京机械设备研究所 | Resistance adjusting program control method |
| CN104407655B (en) * | 2014-12-01 | 2016-02-24 | 北京机械设备研究所 | A kind of programmed control method of adjusting resistance value |
| WO2018014628A1 (en) * | 2016-07-19 | 2018-01-25 | 京东方科技集团股份有限公司 | Conversion circuit and operating method thereof, compensation device and display device |
| US10573232B2 (en) | 2016-07-19 | 2020-02-25 | Boe Technology Group Co., Ltd. | Conversion circuit and operation method thereof, compensation device, and display apparatus |
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Application publication date: 20120704 |