CN101650913B - Self-adjusting circuit for exactly matching reference current between chips - Google Patents
Self-adjusting circuit for exactly matching reference current between chips Download PDFInfo
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- CN101650913B CN101650913B CN2008101423648A CN200810142364A CN101650913B CN 101650913 B CN101650913 B CN 101650913B CN 2008101423648 A CN2008101423648 A CN 2008101423648A CN 200810142364 A CN200810142364 A CN 200810142364A CN 101650913 B CN101650913 B CN 101650913B
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Abstract
The invention relates to the field of integrated circuits, and in particular discloses a self-adjusting circuit for exactly matching reference current between chips. In the implementation process, a chip is configured as a master chip, the other chip is configured as a slave chip and the voltage in the master chip is fed back to the slave chip, so that the problem of deviation of the reference current deviation caused by deviation of an integrated circuit technique when the two chips are cascaded. The circuit can be applied to a system requiring cascade connection of the two chips and exact equality of the reference current of the two chips, such as an OLED display driving chip requiring to realize an Qvga (320*240RGB) resolution.
Description
Technical field
The present invention relates to be used for the high-voltage adjusting circuit of integrated circuit.The circuit that comprises among the present invention relates more specifically to liquid crystal indicator and relevant Analogous Integrated Electronic Circuits technology.The present invention is applicable to needs two chip cascades to use, and in the reference current of two chips system that will accurately equate, in the OLED display driver chip such as big resolution (320*240RGB resolution reaches higher).
Background technology
OLED belongs to the kind of new emergence on display panel, be described as " dreamlike display ".That OLED has is ultra-thin, autoluminescence, response speed are fast, good temp characteristic, can realize many outstanding characteristics such as soft demonstrations, and the following replacement of OLED LCD sooner or later is thought by industry manufacturer.
The OLED display technique is different with traditional LCD display mode, need not backlight, adopts extremely thin coating of organic material and glass substrate, and when electric current passed through, these organic materials will be luminous.Therefore, the levels of precision of drive current has considerable influence to the final display color effect of liquid crystal display.
When the resolution of OLED is big; Because the reaction time of OLED material itself is limited; Therefore using a chip to drive and will have too slow problem of OLED material response time (with the time comparable of a gray scale), in order to address this problem, all is the method that adopts two chip cascades.Because the display effect of OLED is closely related with the drive current on each pixel, therefore when cascade, realize that the accurate coupling of two chip currents just seems very crucial.The drive current of OLED chip for driving produces according to a reference current, has guaranteed the accurate coupling of reference current, also just can realize the accurate coupling of drive current.
Summary of the invention
The purpose of this invention is to provide a kind of circuit, be used for when two chip cascades, can guarantee that two reference current sources in the chip accurately equate.
To achieve these goals, the present invention is achieved in that a kind of accurately self-control circuit of coupling of chip chamber reference current of realizing, it is characterized in that comprise: bias current parts 1 are used to produce the needed bias current of miscellaneous part work; Bandgap voltage reference parts 2 are used to produce the reference voltage of a 1.2V; Voltage generation circuit parts 3; Reference voltage according to bandgap voltage reference parts 2; Produce output voltage V 2 and resistance component and come together to confirm generation reference current, said reference current value I1=Vfb/R; Vfb is the output voltage V 2 that the voltage generation circuit parts 3 of master chip produce, and R is a resistance component 8;
On-off circuit parts 4; According to being master chip or from chip; Confirm the source of the input voltage of comparer parts 5; When chip is master chip, the conducting of said on-off circuit parts, the output voltage V 2 of voltage generation circuit parts 3 is delivered to the input end of comparer parts 5 through on-off circuit parts 4; When chip is during from chip, said on-off circuit parts turn-off, and the input voltage of comparer parts 5 is provided by the output voltage V fb of master chip;
Comparer parts 5 make from the V2 of the Vr=Vfb=master chip of chip according to its empty short empty disconnected principle, confirm the pressure reduction on the resistance component 8, thereby confirm the reference current size of current source parts 6;
Current source parts 6 are used to produce the reference current of our needs, and realize the mirror image of electric current;
PMOS parts 7 play the effect of an adjustable resistance, according to varying in size of said Vfb, are in the different working zone, thereby produce different conducting resistance, realize the adjusting to the reference current size;
Resistance component 8 is put into chip exterior, selects for use precision resister and said voltage Vfb to confirm the size of reference current together.
The present invention has introduced the notion of feedback in design; Through being incorporated into the output voltage V fb in the master chip from chip; Again according to a comparer an end of this clamping to one accurate resistance; The conducting resistance of utilizing PMOS pipe is confirmed the dc point of comparer with the principle of voltage variable, has so just realized master chip and from the accurate coupling of chip reference current.
In practical application, only need extra two port Vfb of increase and a M/S to get final product, Vfb promptly is that master chip feeds back to the voltage from chip, M/S is used for indicating that this chip is a master chip or from chip, should use very convenient.
Description of drawings
Below in conjunction with accompanying drawing and specific embodiment the present invention is done further explain.
Fig. 1 is the circuit block diagram according to first embodiment of the invention;
Fig. 2 is the circuit block diagram according to second embodiment of the invention.
Embodiment
After reading the detailed description of following each side, also comprising the explanation of accompanying drawing, of the present invention these will manifest undoubtedly with other advantages.Below in conjunction with accompanying drawing the present invention is elaborated.
Fig. 1 is the circuit block diagram of the first embodiment of the present invention, comprising: bias current parts 1, bandgap voltage reference parts 2, voltage generation circuit parts 3, on-off circuit parts 4, comparer parts 5, current source parts 6, PMOS parts 7, resistance component 8.
To come the present invention is set forth to this representative instance of OLED driving circuit below.
OLED is a kind of electroluminescent organic material, and its luminous brightness is relevant with the duration of size and electric current of electric current through it.Therefore when using two chip cascades to drive an OLED screen,, will see tangible windowing phenomena, therefore realize that the accurate coupling of two chip currents is most important in the OLED design of drive circuit at intersection if same gray scale has the deviation of electric current.
In Fig. 1, bias current parts 1 produce bias current, give bandgap voltage reference parts 2 and voltage generation circuit parts 3, and their needed bias currents of working are provided; Bandgap voltage reference parts 2 produce a reference voltage V 1, give voltage generation circuit parts 3; The reference voltage V1 that voltage generation circuit parts 3 are sent here according to bandgap voltage reference parts 2 is multiplied by a specific coefficient, obtains output voltage V 2, and V2 outputs to on-off circuit parts 4; On-off circuit parts 4 suspension control signal M/S control, when this chip operation in master chip pattern following time, M/S=1,4 conductings of on-off circuit parts, V2 is connected to Vfb, Vfb outputs to the normal phase input end of comparer parts 5; According to the empty short empty disconnected principle of comparer, the negative-phase input voltage Vr of comparer parts 5 equates that with normal phase input end voltage Vfb the electric current I 1 of current source parts 6 just can be expressed as I1=Vfb/R like this; The effect of PMOS parts 7 is equivalent to a voltage-controlled adjustable resistance, is used for confirming the dc point of comparer parts 5.
Fig. 2 is the circuit block diagram of second embodiment of the invention, connection and collocation method when having described two chip cascades.
In Fig. 2, for master chip, on port, receive power supply to M/S, promptly M/S=1 for from chip, receives ground, i.e. M/S=0 to M/S on port; Connect together master chip with Vfb master chip and from the precision resister of chip external similar resistance on the Vr port from chip.Like this, for master chip, its reference current Im=Vfb/Rm, for saying from chip, its reference current is Is=Vfb/Rs, because Rm=Rs, so Im=Is, has just realized master chip and from the accurate coupling of chip reference current.And can find out; The deviation of Im and Is mainly is the deviation owing to Rm and Rs, and the deviation of comparer parts 5 causes among Fig. 1, under the situation of gain that guarantees outer meeting resistance selection precision resister (error is less than 1%) and comparer parts 5 greater than 60dB; Can be the deviation control of Im and Is below 5%; For the OLED display driver, under this deviation, people's vision can't see top said windowing phenomena.
Claims (2)
1. realize the accurately self-control circuit of coupling of chip chamber reference current for one kind, it is characterized in that, comprising:
Bias current parts (1) are used to produce the needed bias current of miscellaneous part work;
Bandgap voltage reference parts (2) are used to produce the reference voltage of a 1.2V;
Voltage generation circuit parts (3); Reference voltage according to bandgap voltage reference parts (2); Produce output voltage V 2 and resistance component and come together to confirm generation reference current, said reference current value I1=Vfb/R; Vfb is the output voltage V 2 that the voltage generation circuit parts (3) of master chip produce, and R is resistance component (8);
On-off circuit parts (4); According to being master chip or from chip; Confirm the source of the input voltage of comparer parts (5); When chip is master chip, the conducting of said on-off circuit parts, the output voltage V 2 of voltage generation circuit parts (3) is delivered to the input end of comparer parts (5) through on-off circuit parts (4); When chip is during from chip, said on-off circuit parts turn-off, and the input voltage of comparer parts (5) is provided by the output voltage V fb of master chip;
Comparer parts (5) make from the V2 of the Vr=Vfb=master chip of chip according to its empty short empty disconnected principle, confirm the pressure reduction on the resistance component (8), thereby confirm the reference current size of current source parts (6);
Current source parts (6) are used to produce the reference current of our needs, and realize the mirror image of electric current;
PMOS parts (7) play the effect of an adjustable resistance, according to varying in size of said Vfb, are in the different working zone, thereby produce different conducting resistance, realize the adjusting to the reference current size;
Resistance component (8) is put into chip exterior, selects for use precision resister and said voltage Vfb to confirm the size of reference current together.
2. a kind of accurately self-control circuit of coupling of chip chamber reference current of realizing as claimed in claim 1 is characterized in that two methods that chip cascade uses:
When two chip cascades use, be connected into master chip to a chip, be connected into another chip from chip, hold the output voltage V fb of master chip and Vfb to link together from chip;
When chip operation during at the master chip state, the conducting of said on-off circuit parts, the output voltage V 2 of said voltage generation circuit parts is delivered to the input end of comparer parts (5) through on-off circuit parts (4), as its input voltage; When chip operation from chip status the time; On-off circuit parts (4) turn-off; The input voltage of comparer parts (5) is provided by the output voltage V fb of master chip, realize master chip and accurately equate from the input voltage of the comparer parts (5) of chip, and master chip accurately equates with pressure reduction from the resistance component (8) of chip; Because of resistance component uses precision resister, master chip and accurately equate then from the reference current of chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101423648A CN101650913B (en) | 2008-08-12 | 2008-08-12 | Self-adjusting circuit for exactly matching reference current between chips |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101423648A CN101650913B (en) | 2008-08-12 | 2008-08-12 | Self-adjusting circuit for exactly matching reference current between chips |
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| CN101650913A CN101650913A (en) | 2010-02-17 |
| CN101650913B true CN101650913B (en) | 2012-07-04 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US10386875B2 (en) * | 2017-04-27 | 2019-08-20 | Pixart Imaging Inc. | Bandgap reference circuit and sensor chip using the same |
| CN110148387A (en) * | 2019-05-21 | 2019-08-20 | 合肥奕斯伟集成电路有限公司 | A kind of the output compensation method and system of driving circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6674269B1 (en) * | 2002-09-23 | 2004-01-06 | Xerox Corporation | Light emitting diode driver and image forming device including the same |
| CN1723740A (en) * | 2002-08-27 | 2006-01-18 | 美国快捷半导体有限公司 | High efficiency LED driver |
| CN1972541A (en) * | 2005-11-23 | 2007-05-30 | 圆创科技股份有限公司 | LED array drive circuit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1723740A (en) * | 2002-08-27 | 2006-01-18 | 美国快捷半导体有限公司 | High efficiency LED driver |
| US6674269B1 (en) * | 2002-09-23 | 2004-01-06 | Xerox Corporation | Light emitting diode driver and image forming device including the same |
| CN1972541A (en) * | 2005-11-23 | 2007-05-30 | 圆创科技股份有限公司 | LED array drive circuit |
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| CN101650913A (en) | 2010-02-17 |
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Denomination of invention: Self-adjusting circuit for exactly matching reference current between chips Effective date of registration: 20141017 Granted publication date: 20120704 Pledgee: Bank of Shanghai, Limited by Share Ltd, Shenzhen branch Pledgor: Teralane Semiconductor (Shenzhen) Co., Ltd. Registration number: 2014990000861 |
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Owner name: SHENZHEN KEMING INDUSTRIAL CO., LTD. Free format text: FORMER OWNER: TIANLI SEMICONDUCTOR (SHENZHEN) CO., LTD. Effective date: 20150716 |
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Effective date of registration: 20150716 Address after: 518000 main building of Xin Xing square, Shennan East Road, Shenzhen, Guangdong, Luohu District 59-1 Patentee after: Shenzhen Keming Industrial Co. Ltd. Address before: Nanshan District River Road Shenzhen city Guangdong province 518067 No. 6 jialitai Building 8 floor E block Patentee before: Teralane Semiconductor (Shenzhen) Co., Ltd. |
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