CN102045053A - Multi-channel integrator - Google Patents
Multi-channel integrator Download PDFInfo
- Publication number
- CN102045053A CN102045053A CN2009102072785A CN200910207278A CN102045053A CN 102045053 A CN102045053 A CN 102045053A CN 2009102072785 A CN2009102072785 A CN 2009102072785A CN 200910207278 A CN200910207278 A CN 200910207278A CN 102045053 A CN102045053 A CN 102045053A
- Authority
- CN
- China
- Prior art keywords
- input
- integrator
- passage
- switch
- coupled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Electronic Switches (AREA)
Abstract
The invention discloses a multi-channel integrator, which comprises an integrator and a plurality of channels, wherein each channel comprises an input selector and a unity gain amplifier; the input selector is provided with a common end, a first selecting end and a second selecting end and is used for selectively and electrically connecting the common end to the first selecting end or the second selecting end; the first selecting end of the input selector is coupled to an input end of the integrator; and an input end of the unity gain amplifier is coupled to the second selecting end of the input selector.
Description
Technical field
The present invention relates to a kind of integrator, and relate in particular to a kind of integrator of a plurality of passages.
Background technology
Flourish along with electronic technology, and the universalness of wireless telecommunications and network, electronic installation miscellaneous becomes the indispensable instrument of life gradually.Yet (input/output, I/O) interface similarly are keyboard or mouse, have the operating difficulties of certain degree for general common input and output.By contrast, contact panel is a kind of intuitively, simply the input and output interface.Therefore, contact panel often is employed as the man-machine interface between people and the electronic installation, to carry out control.
In general, contact panel can be divided into electric resistance touch-control panel, optical touch control panel, capacitance type touch-control panel etc.If according to reading (readout) means, then can be divided into current type contact panel (current type touch panel) and electric charge formula contact panel (charge type touch panel) etc.Fig. 1 illustrates that capacitance type touch-control panel (capacitor type touch panel) and tradition read the schematic diagram of circuit (readout circuit).The Y direction and the X-direction of general capacitance type touch-control panel 110 have many sense wires (sensor line) separately.Article one, can form a coupling capacitance Cp between the sense wire of the sense wire of Y direction and an X-direction.
Each bar sense wire all disposes an integrator 120, and each integrator 120 all disposes an operational amplifier 122 and a feedback capacity Cfb.The non-inverting input of all operational amplifiers 122 receives the reference voltage V of 0V at the beginning
Ref, and all switches 123 are conducting (turn on), so all sense wires all are charged to 0V.Next each integrator 120 can be with switch 123 by (turn off), so that carry out read operation., suppose without any electric conductor (for example finger) between 123 off periods at switch near contact panel 110, as reference voltage V
RefWhen 0V went to 5V, the integrator 120 of Y direction and X-direction can make two terminal voltages of coupling capacitance Cp be 5V.Owing to do not need coupling capacitance Cp is discharged and recharged, therefore at reference voltage V
RefWhen going to 5V, this variation can be reflected in the output of integrator 120.After each integrator 120 was finished read operation, all switches 123 can be switched on again, so go round and begin again.
When electric conductor (for example finger) during near contact panel 110, correspondence position can form extra capacitor C f (as shown in Figure 1).At switch between 123 off periods, as reference voltage V
RefWhen 0V went to 5V, corresponding integrator 120 need discharge and recharge extra capacitor Cf via sense wire.Therefore, at reference voltage V
RefWhen going to 5V, extra capacitor Cf the output OUT of corresponding integrator 120 can change, its formula is OUT=5+[(5V-0V) * Cf]/Cfb.Integrator 120 will read (readout) result and transfer to subsequent conditioning circuit (comprise analog-digital converter and image-processing circuit, do not illustrate at this) judgement position coordinates.By the two different of the signal that sense wire reads and the signal that sense wire reads that does not have extra capacitor Cf that form extra capacitor Cf, so can orient the position that is touched.
As shown from the above formula, if the big more then feedback capacity of extra capacitor Cf Cfb must be big more, otherwise be easy to allow the output of integrator 120 reach capacity (saturation) and can not judge touch position.Yet, reaching capacity for fear of the output of integrator 120, the feedback capacity Cfb of integrator 120 also must increase capacitance (promptly increasing the area of feedback capacity Cfb) thereupon.Because each bar sense wire needs an integrator 120, so integrator 120 shared chip areas will be very considerable.
Summary of the invention
The invention provides a kind of multichannel integrator, to save chip area.
The present invention proposes a kind of multichannel integrator, comprises integrator and a plurality of passage.Wherein, each passage comprises input selector and unity gain amplifier.The common ends that input selector optionally is connected to input selector with the input or the reference voltage of integrator.
The present invention proposes a kind of multichannel integrator, comprises integrator and a plurality of passage.Each passage comprises input selector.Input selector has common ends, first selecting side and second selecting side, in order to optionally common ends is electrically connected to first selecting side or second selecting side.Wherein, first selecting side of input selector is coupled to the input of integrator, and second selecting side of input selector receives reference voltage.
In one embodiment of this invention, above-mentioned integrator comprises first operational amplifier, feedback capacity and feedback switch.The first input end of first operational amplifier is as the input of this integrator, and second input of first operational amplifier receives this reference voltage, and the output of first operational amplifier is as the output of this integrator.First end of feedback capacity and second end are coupled to the first input end and the output of first operational amplifier respectively.First end of feedback switch and second end are coupled to the first input end and the output of first operational amplifier respectively.
In one embodiment of this invention, when during first passage, above-mentioned feedback switch is for ending, the input selector of first passage is selected its common ends is electrically connected to its first selecting side in these a plurality of passages, and the input selector of rest channels is selected its common ends is electrically connected to its second selecting side in these a plurality of passages.
Based on above-mentioned, by sharing a group inte gration device between a plurality of passages in turn, therefore can significantly save chip area, and then save cost.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and be described in detail below in conjunction with the accompanying drawings.
Description of drawings
Fig. 1 illustrates that capacitance type touch-control panel and tradition read the schematic diagram of circuit;
Fig. 2 is the circuit diagram that a kind of multichannel integrator is described according to the embodiment of the invention;
Fig. 3 is the control timing according to each control signal in the embodiment of the invention key diagram 2;
Fig. 4 is the circuit diagram that another kind of multichannel integrator is described according to the embodiment of the invention;
Fig. 5 is the circuit diagram according to multichannel integrator in the embodiment of the invention key diagram 4;
Fig. 6 is the circuit diagram that a kind of multichannel integrator is described according to another embodiment of the present invention;
Fig. 7 is the circuit diagram according to input selector in another embodiment of the present invention key diagram 6.
Embodiment
Following examples will be example with capacitance type touch-control panel (capacitor type touch panel) 110, and the application mode of multichannel integrator of the present invention is described.Yet range of application of the present invention should be as limit.Any electric charge formula contact panel, or even any circuit or electronic product that needs the multichannel integrator all can be used it according to the teaching of this specification.
Fig. 2 is the circuit diagram that a kind of multichannel integrator is described according to the embodiment of the invention.This multichannel integrator 200 has n passage 210-1～210-n.Only draw first passage 210-1 and n passage 210-n among the figure, other passage can be with reference to the explanation of first passage 210-1 and is analogized it.In addition, multichannel integrator 200 still has integrator 220.Share a group inte gration device 220 between passage 210-1～210-n in turn, therefore can significantly save chip area, and then save cost.Below will describe passage 210-1～210-n in detail and how use this integrator 220 in turn.
With reference to Fig. 2, in present embodiment, the implementation of passage 210-1～210-n is all identical.For example, passage 210-1 comprises input selector 211 and unit gain (unit-gain) amplifier 212.Input selector 211 has common ends, first selecting side and second selecting side, and the input of unity gain amplifier 212 is coupled to second selecting side of input selector 211.The input of integrator 220 is coupled to first selecting side of input selector 211 among all passage 210-1～210-n.In passage 210-1, the common ends of input selector 211 is coupled to article one sense wire of contact panel 110.In passage 210-n, the common ends of input selector 211 is coupled to the n bar sense wire of contact panel 110.The input selector 211 of passage 210-1 is controlled by control signal S1, and the input selector 211 of passage 210-n then is controlled by control signal Sn.Input selector 211 is selected common ends is electrically connected to first selecting side according to corresponding control signal, or selects common ends is electrically connected to second selecting side.
Fig. 3 is the control timing according to each control signal S1～Sn in the embodiment of the invention key diagram 2.Simultaneously with reference to Fig. 2 and Fig. 3, when system when power supply is just during logical (power on), or system is during reset (reset), system can be made as reset signal Reset activation (enable) state (for example being the logic low level).When reset signal Reset was the logic low level, the input selector 211 of all passage 210-1～210-n was selected this common ends is electrically connected to this second selecting side, makes unity gain amplifier 212 be coupled to the sense wire of contact panel 110.
During T1, control signal S1 can transfer the logic high levle to during entering first passage, and other control signal S2～Sn then maintains the logic low level.Therefore, T1 during first passage, the input selector 211 of first passage 210-1 is selected its common ends is electrically connected to its first selecting side, and the input selector 211 of rest channels (for example passage 210-n) is selected its common ends is electrically connected to its second selecting side.Therefore, T1 during first passage, passage 210-1 can use integrator 220, and rest channels just is coupled to the sense wire of contact panel 110 correspondences with the input of its inner unity gain amplifier 212, so that intend input for integrator.
When (for example T1 during the first passage) during the present passage finishes but during not entering next passage as yet when (for example T2 during the second channel) (during being equivalent to reset), system can be made as reset signal Reset the logic low level, as shown in Figure 3, this moment, control signal S1 can transfer the logic low level to.During this period, the input selector 211 of all passage 210-1～210-n is selected this common ends is electrically connected to this second selecting side, makes the input of unity gain amplifier 212 be coupled to the sense wire of contact panel 110.
Then enter T2 during the second channel.T2 during second channel, control signal S2 can transfer the logic high levle to, and other control signal S1, S3～Sn then maintain the logic low level.Therefore, (Fig. 2 does not illustrate second passage, related description that can passage 210-1 and analogize it) can during second channel, use integrator 220 by T2, and rest channels just is coupled to the sense wire of contact panel 110 correspondences with the input of its inner unity gain amplifier 212, so that intend the input for integrator.By that analogy, during Tn, n passage 210-n can use integrator 220 during entering the n passage, and rest channels just is coupled to the sense wire of contact panel 110 correspondences with the input of its inner unity gain amplifier 212.T3 during T2, the third channel during the second channel ..., the detail operations of Tn can be with reference to the related description of T1 during the first passage, so repeat no more during the n passage.
Late-class circuit (do not illustrate, it can be analog-digital converter and image-processing circuit) is coupled to the output of integrator 220.Therefore, late-class circuit can receive the signal that reads of more than 110 sense wire of contact panel in regular turn, and then orients the position that is touched in the contact panel 110.
Fig. 4 is the circuit diagram that another kind of multichannel integrator is described according to the embodiment of the invention.This multichannel integrator 400 has n passage 410-1～410-n.Only draw first passage 410-1 and n passage 410-n among the figure, other passage can be analogized it with reference to passage 410-1 explanation.This embodiment is similar to Fig. 2, so partial content just repeats no more.The place that Fig. 4 is different with Fig. 2 is more to have disposed in the passage sampling switch 413 and sampling capacitor 414.
With reference to Fig. 4, the implementation of passage 410-1 to 410-n is all identical.Below will be with passage 410-1 example as an illustration.In passage 410-1, first end of sampling switch 413 is coupled to the output of integrator 220.The sampling switch 413 of passage 410-1 to 410-n be controlled by respectively control signal SS1, SS2, SS3 ..., SSn (with reference to Fig. 3).First end of sampling capacitor 414 is coupled to second end of sampling switch 413, and second termination of sampling capacitor 414 is received second reference voltage (for example being earthed voltage).
Simultaneously with reference to Fig. 3 and Fig. 4, during T1, control signal S1 and SS1 can transfer the logic high levle to during entering first passage, and other control signal S2～Sn and SS2～SSn then maintain the logic low level.Therefore, T1 during first passage, the input selector 211 of first passage 410-1 is selected its common ends is electrically connected to its first selecting side, and the sampling switch 413 of first passage 410-1 is conducting, so the output of integrator 220 can be stored in sampling capacitor 414.T1 during first passage, the input selector 211 of rest channels (for example passage 410-n) is selected its common ends is electrically connected to its second selecting side, and sampling switch 413 is for ending.By that analogy, during Tn, n passage 410-n can use integrator 220, and the output of integrator 220 is stored in the sampling capacitor 414 of passage 410-n during entering the n passage.T3 during T2, the third channel during the second channel ..., the detail operations of Tn can be with reference to the related description of T1 during the first passage, so repeat no more during the n passage.
Because the sampling capacitor 414 of each passage 410-1～410-n has had the signal that reads of more than 110 sense wire of contact panel, therefore late-class circuit (does not illustrate, it can be analog-digital converter and image-processing circuit) can read the signal of each sampling capacitor 414, and then orient the position that is touched in the contact panel 110.
Fig. 5 is the circuit diagram according to multichannel integrator 400 in the embodiment of the invention key diagram 4.With reference to Fig. 5, unity gain amplifier 212 comprises the second operational amplifier OP2.The first input end of operational amplifier OP2 is coupled to second selecting side of input selector 211, and second input of operational amplifier OP2 receives reference voltage V
Ref, and the output of operational amplifier OP2 is coupled to the first input end of operational amplifier OP2.In the present embodiment, the first input end of operational amplifier OP2 is inverting input (inverting input), and second input of operational amplifier OP2 is non-inverting input (non-inverting input).
In addition, using the present embodiment person can look its design requirement and determine reference voltage V
RefAccurate position.For example, with reference voltage V
RefBe set at the accurate position of system voltage VDDA half (being VDDA/2), or be set at band gap voltage (band-gap voltage), or be set at+5V, or be set at other fixed voltage.Present embodiment is with reference voltage V
RefBe set at time time variant voltage in response to reset signal Reset.When reset signal Reset is the logic low level, reference voltage V
RefBe earthed voltage (being 0V).After reset signal Reset transfers the logic high levle to, reference voltage V
RefHalf that can be in response to reset signal Reset transfer system voltage VDDA to (is VDDA/2, for example+5V).
With reference to Fig. 5, integrator 220 comprises the first operational amplifier OP1, feedback capacity Cfb and feedback switch SWfb.The first input end of operational amplifier OP1 is coupled to first selecting side of input selector 211 among all passage 410-1～410-n, and second input of operational amplifier OP1 receives reference voltage V
RefIn the present embodiment, the first input end of operational amplifier OP1 is an inverting input, and second input of operational amplifier OP1 is a non-inverting input.First end of feedback capacity Cfb and second end are coupled to first input end and the output of operational amplifier OP1 respectively.First end of feedback switch SWfb and second end also are coupled to first input end and the output of operational amplifier OP1 respectively.Feedback switch SWfb is controlled by signal ResetB, and wherein signal ResetB is the inversion signal of reset signal Reset.
Simultaneously with reference to Fig. 3 and Fig. 5, when system is during power supply is just logical, or system is during resetting, and system can be made as reset signal Reset logic low level (being that signal ResetB is set as the logic high levle), makes that feedback switch SWfb is conducting and replacement feedback capacity Cfb.In addition, because control signal S1～Sn is the logic low level, make the input selector 211 of whole passage 410-1～410-n select the sense wire of contact panel 110 is electrically connected to unity gain amplifier 212.
During T1, system can be made as reset signal Reset logic high levle (being that signal ResetB is set as the logic low level) with by feedback switch SWfb, makes integrator 220 can carry out integration operation during entering first passage.During this period, control signal S1 can respond reset signal Reset and transfer the logic high levle to, and other control signal S2～Sn then maintains the logic low level.Therefore, T1 during first passage, the inverting input of operational amplifier OP1 are electrically connected to the pairing sense wire of first passage 410-1 in the contact panel 110, and the output of operational amplifier OP1 can be stored in the sampling capacitor 414 of first passage 410-1.The unity gain amplifier 212 of rest channels (for example passage 410-n) is electrically connected to other sense wire of contact panel 110.
When (for example T1 during the first passage) during the present passage finishes but during not entering next passage as yet when (for example T2 during the second channel) (during being equivalent to reset), system can be made as reset signal Reset the logic low level, as shown in Figure 3, this moment, control signal S1 can transfer the logic low level to.During this period, the input selector 211 of all passage 410-1～410-n is selected this common ends is electrically connected to this second selecting side, makes unity gain amplifier 212 be coupled to the sense wire of contact panel 110.In integrator 220, signal ResetB Control and Feedback switch SW fb is conducting and replacement feedback capacity Cfb.By that analogy, during Tn, n passage 410-n can use integrator 220, and the output of integrator 220 is stored in the sampling capacitor 414 of passage 410-n during entering the n passage.T3 during T2, the third channel during the second channel ..., the detail operations of Tn can be with reference to the related description of T1 during the first passage, so repeat no more during the n passage.
Fig. 6 is the circuit diagram that a kind of multichannel integrator is described according to another embodiment of the present invention.This embodiment is similar to Fig. 5, so the same section content just repeats no more.The place that Fig. 6 is different with Fig. 5 is to have saved in each passage unity gain amplifier 212.With reference to Fig. 6, multichannel integrator 600 comprises integrator 220 and a plurality of passage 610-1～610-n.Only draw first passage 610-1 and n passage 610-n among the figure, other passage can be with reference to the explanation of first passage 610-1 and is analogized it.In present embodiment, the implementation of passage 610-1～610-n is all identical.Below will be with passage 610-1 example as an illustration.Passage 610-1 comprises input selector 211, sampling switch 413 and sampling capacitor 414.In other embodiments, sampling switch 413 may be omitted (being similar to shown in Figure 2) with sampling capacitor 414.
With reference to Fig. 6, first selecting side of input selector 211 is coupled to the input of integrator 220, and second selecting side of input selector 211 receives reference voltage V
RefAccording to the control of control signal S1, the input selector 211 of passage 610-1 is selected common ends is electrically connected to first selecting side, perhaps selects common ends is electrically connected to second selecting side.Therefore, when control signal S1 was the logic high levle, the input selector 211 of passage 610-1 selected the sense wire of contact panel 110 is electrically connected to the input of integrator 220.Then, when control signal SS1 was the logic high levle, the sampling switch 413 of passage 610-1 transferred to sampling capacitor 414 with the output of integrator 220.When control signal S1 was the logic low level, the input selector 211 of passage 610-1 was selected the sense wire of contact panel 110 is electrically connected to reference voltage V
RefThen, control signal SS1 is the logic low level, and the sampling switch 413 of passage 610-1 then can disconnect.
Fig. 7 is the circuit diagram according to input selector 211 in another embodiment of the present invention key diagram 6.In present embodiment, the input selector 211 of passage 610-1～610-n can be realized it in the same manner.With reference to Fig. 7, the input selector 211 of passage 610-1 comprise first not gate 710, second not gate 720, first and door 730, second with 740, first switch 750, second switch 760 and the 3rd switch 770.First end of switch 750～770 is coupled to corresponding sense wire in the contact panel 110.Second end of the 3rd switch 770 is coupled to integrator 220.Reference voltage V
RefComprise high voltage V
Ref+With low-voltage V
Ref-Second end of second switch 760 is coupled to high voltage V
Ref+, its high voltage appearance V
Ref+Be set to reference voltage V
RefLogic high levle (being VDDA/2).Second end of first switch 750 is coupled to low-voltage V
Ref-, low-voltage V wherein
Ref-Be set to reference voltage V
RefLogic low level (being 0V).Switch 750～770 be controlled by respectively not gate 710, with the door 730 with door 740.
The input of first not gate 710 receives reset signal Reset.The output of first not gate 710 is coupled to the control end of first switch 750.Receive reset signal Reset with door 730 and first input end with door 740.The output of second not gate 720 be coupled to first with door 730 second input.First is coupled to the control end of second switch 760 with door 730 output.Second is coupled to the control end of the 3rd switch 770 with door 740 output.In passage 610-1, the input of second not gate 720 and second and door 740 second input receive control signal S1.Similarly, in passage 610-n the input of second not gate 720 and second and door 740 second input receive control signal Sn.
With reference to Fig. 3 and Fig. 7, when the reset signal Reset of system was set to the logic low level, first switch 750 can conductings and switch 760 and 770 can end.Reset signal Reset is set to the logic high levle when system, and control signal S1 is when being set to the logic high levle, and the 3rd switch 770 can conductings and switch 750 and 760 can end.Reset signal Reset is set to the logic high levle when system, and control signal S1 is when being set to the logic low level, and second switch 760 can conductings and switch 750 and 770 can end.
In sum, the foregoing description is by sharing a group inte gration device 220 between a plurality of passages in turn.If the port number n of multichannel integrator is big more, the effect of saving chip area is remarkable more, therefore can significantly save chip area, and then saves cost.
Though the present invention discloses as above with embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (23)
1. multichannel integrator comprises:
Integrator; And
A plurality of passages, wherein each passage comprises:
Input selector has common ends, first selecting side and second selecting side, and in order to optionally described common ends is electrically connected to described first selecting side or described second selecting side, wherein said first selecting side is coupled to the input of described integrator; And
Unity gain amplifier, its input are coupled to second selecting side of described input selector.
2. multichannel integrator as claimed in claim 1, wherein said integrator comprises:
First operational amplifier, the first input end of wherein said first operational amplifier is as the input of described integrator, second input of described first operational amplifier receives reference voltage, and the output of described first operational amplifier is as the output of described integrator;
Feedback capacity, its first end and second end are coupled to the first input end and the output of described first operational amplifier respectively; And
Feedback switch, its first end and second end are coupled to the first input end and the output of described first operational amplifier respectively.
3. multichannel integrator as claimed in claim 2, wherein when during power supply is just logical, described feedback switch is conducting, and the input selector of described a plurality of passages is selected described common ends is electrically connected to described second selecting side.
4. multichannel integrator as claimed in claim 2, in the time of wherein during resetting, described feedback switch is conducting, and the input selector of described a plurality of passages is selected described common ends is electrically connected to described second selecting side.
5. multichannel integrator as claimed in claim 2, in the time of wherein during the passage in during a plurality of passages, described feedback switch is for ending, the input selector of a corresponding passage is selected its common ends is electrically connected to its first selecting side in described a plurality of passage, and the input selector of rest channels is selected its common ends is electrically connected to its second selecting side in described a plurality of passage.
6. multichannel integrator as claimed in claim 1, in the time of wherein but during not entering next passage as yet when finishing during the present passage, described feedback switch is conducting, and the input selector of described a plurality of passages is selected described common ends is electrically connected to described second selecting side.
7. multichannel integrator as claimed in claim 2, the first input end of wherein said first operational amplifier is an inverting input, and second input of described first operational amplifier is a non-inverting input.
8. multichannel integrator as claimed in claim 1, wherein said unity gain amplifier comprises second operational amplifier, the first input end of wherein said second operational amplifier is coupled to second selecting side of described input selector, second input of described second operational amplifier receives reference voltage, and the output of described second operational amplifier is coupled to the first input end of described second operational amplifier.
9. multichannel integrator as claimed in claim 8, the first input end of wherein said second operational amplifier is an inverting input, and second input of described second operational amplifier is a non-inverting input.
10. multichannel integrator as claimed in claim 1, wherein each passage also comprises:
Sampling switch, its first end is coupled to the output of described integrator; And
Sampling capacitor, its first end is coupled to second end of described sampling switch, and second termination of described sampling capacitor is received second reference voltage.
11. multichannel integrator as claimed in claim 10, in the time of wherein during the passage in during a plurality of passages, the sampling switch of a corresponding passage is conducting in described a plurality of passages, and in described a plurality of passage the sampling switch of rest channels for ending.
12. multichannel integrator as claimed in claim 1, the common ends of input selector is coupled to corresponding sense wire in the contact panel respectively in wherein said a plurality of passages.
13. a multichannel integrator comprises:
Integrator; And
A plurality of passages, wherein each passage comprises:
Input selector, the common ends that it optionally is connected to described input selector with the input or the reference voltage of described integrator.
14. multichannel integrator as claimed in claim 13, wherein said integrator comprises:
First operational amplifier, the first input end of wherein said first operational amplifier is as the input of described integrator, second input of described first operational amplifier receives described reference voltage, and the output of described first operational amplifier is as the output of described integrator;
Feedback capacity, its first end and second end are coupled to the first input end and the output of described first operational amplifier respectively; And
Feedback switch, its first end and second end are coupled to the first input end and the output of described first operational amplifier respectively.
15. multichannel integrator as claimed in claim 14, wherein when during power supply is just logical, described feedback switch is conducting, and the input selector of described a plurality of passages is selected described common ends is electrically connected to described reference voltage.
16. multichannel integrator as claimed in claim 14, in the time of wherein during resetting, described feedback switch is conducting, and the input selector of described a plurality of passages is selected described common ends is electrically connected to described reference voltage.
17. multichannel integrator as claimed in claim 14, in the time of wherein during the passage in during a plurality of passages, described feedback switch is for ending, the input selector of a corresponding passage selects its common ends is electrically connected to the input of described integrator in described a plurality of passage, and the input selector of rest channels is selected its common ends is electrically connected to described reference voltage in described a plurality of passage.
18. multichannel integrator as claimed in claim 14, in the time of wherein but during not entering next passage as yet when finishing during the present passage, described feedback switch is conducting, and the input selector of described a plurality of passages is selected described common ends is electrically connected to described reference voltage.
19. multichannel integrator as claimed in claim 14, the first input end of wherein said first operational amplifier is an inverting input, and second input of described first operational amplifier is a non-inverting input.
20. multichannel integrator as claimed in claim 13, wherein each passage also comprises:
Sampling switch, its first end is coupled to the output of described integrator; And
Sampling capacitor, its first end is coupled to second end of described sampling switch, and second termination of described sampling capacitor is received second reference voltage.
21. multichannel integrator as claimed in claim 20, in the time of wherein during the passage in during a plurality of passages, the sampling switch of a corresponding passage is conducting in described a plurality of passages, and in described a plurality of passage the sampling switch of rest channels for ending.
22. multichannel integrator as claimed in claim 13, wherein said reference voltage comprises high voltage and low-voltage, and the input selector of each passage comprises separately:
First switch has control end, first end and second end, and first end of described first switch is as the common ends of described input selector, and second end of described first switch is coupled to described low-voltage;
Second switch has control end, first end and second end, and first end of described second switch is coupled to first end of described first switch, and second end of described second switch is coupled to described high voltage;
The 3rd switch has control end, first end and second end, and first end of described the 3rd switch is coupled to first end of described first switch, and second end of described the 3rd switch is coupled to described integrator;
First not gate, its input receives reset signal, and the output of described first not gate is coupled to the control end of described first switch;
Second not gate, its input receives control signal;
First with door, its first input end receives described reset signal, described first is coupled to the output of described second not gate with second input of door, and described first be coupled to the control end of described second switch with the output of door; And
Second with door, its first input end receives described reset signal, described second receives described control signal with second input of door, and described second be coupled to the control end of described the 3rd switch with the output of door.
23. multichannel integrator as claimed in claim 13, the common ends of input selector is coupled to corresponding sense wire in the contact panel respectively in wherein said a plurality of passages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102072785A CN102045053A (en) | 2009-10-23 | 2009-10-23 | Multi-channel integrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102072785A CN102045053A (en) | 2009-10-23 | 2009-10-23 | Multi-channel integrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102045053A true CN102045053A (en) | 2011-05-04 |
Family
ID=43910905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102072785A Pending CN102045053A (en) | 2009-10-23 | 2009-10-23 | Multi-channel integrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102045053A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103164075A (en) * | 2011-12-16 | 2013-06-19 | 矽统科技股份有限公司 | Sensing device, touch sensing system, and display device |
-
2009
- 2009-10-23 CN CN2009102072785A patent/CN102045053A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103164075A (en) * | 2011-12-16 | 2013-06-19 | 矽统科技股份有限公司 | Sensing device, touch sensing system, and display device |
| CN103164075B (en) * | 2011-12-16 | 2016-05-04 | 矽统科技股份有限公司 | Sensing apparatus, touch-control sensing system and display unit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101150309B (en) | A self-adapted capacitance touch sensing control circuit | |
| KR101292733B1 (en) | Multi-touch panels capacitance sensing circuitry | |
| US8575947B1 (en) | Receive demodulator for capacitive sensing | |
| US9091714B2 (en) | Capacitance measurement circuit and method therefor | |
| KR101178731B1 (en) | Circuit for processing touch line signal of touch screen | |
| CN102566817B (en) | Sensing methods for touch sensing devices | |
| US9146650B2 (en) | High resolution capacitance to code converter | |
| CN103593097A (en) | Terminal equipment and touch detection system thereof | |
| CN104238846A (en) | Touch device and sensing compensation method | |
| CN104571734A (en) | Self-mutual capacitance detection circuit and capacitive touch panel | |
| US20110063233A1 (en) | Readout apparatus and multi-channel readout apparatus for touch panel | |
| CN102043503B (en) | Reading device and multichannel reading device for touch-control panel | |
| CN102045053A (en) | Multi-channel integrator | |
| CN102045059B (en) | Muti-channel integrator | |
| US20170192551A1 (en) | Capacitive type touch input device with compensation circuit for stray capacitance | |
| TWI412229B (en) | Multi-channel integrator | |
| CN101957698B (en) | Object positioning and detecting device and p method of capacitance type touchpad | |
| US8035439B2 (en) | Multi-channel integrator | |
| TWI406032B (en) | Readout apparatus and multi-channel readout apparatus for touch panel | |
| CN108475133B (en) | Touch panel driving circuit and touch sensing method using the same | |
| CN209803294U (en) | Detection apparatus for matrix button | |
| CN102480297B (en) | Successive comparison type AD converter | |
| CN216670703U (en) | Capacitance induction circuit | |
| CN102693976B (en) | Integrated circuit with electrostatic protection capacity | |
| CN106933399B (en) | Capacitive touch input device with stray capacitance compensation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110504 |