CN1490759A - Scanner for transmitting analog electronic signals in differential pairs and its operation - Google Patents
Scanner for transmitting analog electronic signals in differential pairs and its operation Download PDFInfo
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- CN1490759A CN1490759A CNA021462755A CN02146275A CN1490759A CN 1490759 A CN1490759 A CN 1490759A CN A021462755 A CNA021462755 A CN A021462755A CN 02146275 A CN02146275 A CN 02146275A CN 1490759 A CN1490759 A CN 1490759A
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- electronic signal
- analog electronic
- differential
- analog
- scanister
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Abstract
The present invention is a scanning device for transmitting analog signals in a differential pairs mode and the operating method thereof. The invention transmits the analog electronic signals of the image capturing element in the scanning device in the differential pairs mode, so that the original analog electronic signals are transmitted in one signal line, and the signals which have the same electric potential as the original electronic signals but the reversal phase to the same are transmitted in the other signal line, thereby the electromagnetic interference generated from the original analog electronic signals can be counteracted with each other.
Description
Technical field
The invention relates to a kind of scanister and How It Works thereof, and particularly relevant for a kind of with differential scanister and How It Works thereof to the mode transfer analog electronic signal.
Background technology
Scanner is a kind of a kind of machine between duplicating machine and camera.In the past because expensive price almost is some patents as particular job persons such as artistic workings.In recent years,, squeezed into the main flow of pc world finally, become the senior general of personal computer enclosure equipment because the price that strong competition the caused downslide in scanner market is added in advancing by leaps and bounds of computer technology.
Scanner can be distinguished into some kinds of forms according to its price or function, and general scanner approximately can be distinguished into handly scanner, paper feeding scanner, business card scanner, negative film scanner and falt bed scanner etc. basically.Wherein, the similar glass platform of falt bed scanner is that file or pattern are placed on the flat glass, is moved by sensor and data are read in.Because its structure is can be too complicated, and also difficulty not too of using method, add the function extendibility that it has height, therefore become the arrange in pairs or groups main flow of scanner of computer user now.
At present, because the transmission speed of computer interface is more and more fast, so cause the data processing speed of scanner also must accelerate, electromagnetic interference (EMI) (ElectromagneticInterference, be called for short EMI) also can be handled because of seriously being difficult to of becoming of high-speed transfer thus.
Next please refer to Fig. 1, it is the functional-block diagram of known a kind of scanister 10.As shown in Figure 1, scanister 10 comprises image capture element board 102 (for example being charge coupled cell (Charge Coupled Device is called for short CCD) plate) and mainboard (Main Board) 104.Image capture element board 102 is to link mutually by a cable (Cable) with mainboard 104.Above-mentioned image capture element board 102 comprises image capture element 106 (for example being CCD).And above-mentioned mainboard 104 comprises AFE (analog front end) (Analog Front End is called for short AFE) 108, analog-to-digital converter 110 and image capture element clock generator 112.The beneath How It Works that scanister 10 will be described.At first, image capture element clock generator 112 can provide several clock signals to image capture element 106, to drive image capture element 106.The optical signalling of gained was done opto-electronic conversion and is exported analog electronic signal when then, 106 meetings of image capture element were with scanning document.Afterwards, AFE (analog front end) 108 can convert analog electronic signal to the AFE (analog front end) electronic signal, and passes through analog-to-digital converter 110, and the AFE (analog front end) electronic signal is done simulated to digital conversion, and the output digital electronic signal.Wherein, right because the higher clock signal of the frequency in the clock signal that image capture element clock generator 112 is produced (for example being displacement clock pulse (Shift Clock (φ 1, and φ 2))) is anti-phase each other signal, so EMI can mutually offset.Yet the mode of known transportation simulator electronic signal is to transmit with single-ended (SingleEnd) pattern, please refer to Fig. 2, and it is known a kind of analog electronic signal v that is transmitted with single-ended mode
IWaveform.As shown in Figure 2, analog electronic signal v
ICurrent potential be V
OsGenerally speaking, the size of EMI is directly proportional with the distance of current potential, frequency and the signal transmission of signal.Owing to have current potential V
OsAnalog electronic signal be that the distance of the signal of higher-frequency and transmission is longer, so come the transportation simulator electronic signal with single-ended mode, it is quite serious to make that the problem of EMI becomes.Because EMI can influence the health of human body,, therefore how to reduce the EMI of scanister and the standard that meets various countries' defined has become considerable problem so all there is certain standard various countries for the EMI of electronic product.
Summary of the invention
In view of this, the objective of the invention is to propose a kind of with differential scanister and How It Works thereof to the mode transfer analog electronic signal.Because the present invention is the analog electronic signal that transmits the image capture element in the scanister in differential right mode, and make the original analog electronic signal of transmission on the signal wire, transmission is identical with original analog electronic signal current potential on another signal wire, but anti-phase signal therefore can be so that the original electromagnetic interference (EMI) that analog electronic signal produced mutually offsets.
For reaching above-mentioned and other purpose, the present invention proposes a kind of with differential scanister to the mode transfer analog electronic signal.This scanister comprises image capture element board and mainboard.Above-mentioned image capture element board comprises image capture element and differential output driver.Wherein, the image capture element is the optical signalling of gained when receiving scanning document, and optical signalling is done opto-electronic conversion and exported analog electronic signal.And differential output driver is coupled to the image capture element, in order to analog electronic signal is converted to differential mode and exports differential analog electronic signal.Above-mentioned mainboard is coupled to the image capture element board.This mainboard comprises differential input sink, in order to receiving differential analog electronic signal, and differential analog electronic signal is reduced into analog electronic signal.
In a preferred embodiment of the present invention, this mainboard more comprises AFE (analog front end) and analog-to-digital converter.Wherein, AFE (analog front end) is coupled to differential input sink, in order to analog electronic signal is converted to the AFE (analog front end) electronic signal.And analog-to-digital converter is coupled to AFE (analog front end), in order to being done, the AFE (analog front end) electronic signal simulates to digital conversion, and the output digital electronic signal.
In a preferred embodiment of the present invention, mainboard more comprises image capture element clock generator, in order to provide several clock signals to the image capture element, to drive the image capture element.
In a preferred embodiment of the present invention, the image capture element board can be charge coupled cell, contact-type image inductor or CMOS (Complementary Metal Oxide Semiconductor) inductor.
The present invention also proposes a kind of How It Works with differential scanister to the mode transfer analog electronic signal.In this How It Works, the optical signalling of gained when at first the image capture element can receive scanning document, and optical signalling done opto-electronic conversion and export analog electronic signal.Then, differential output driver can convert analog electronic signal differential mode to and export differential analog electronic signal.Next, differential input sink can receive differential analog electronic signal, and differential analog electronic signal is reduced into analog electronic signal.Afterwards, AFE (analog front end) can convert analog electronic signal to the AFE (analog front end) electronic signal, and passes through analog-to-digital converter, and the AFE (analog front end) electronic signal is done simulated to digital conversion, and the output digital electronic signal.
In a preferred embodiment of the present invention, differential analog electronic signal comprises noninverting analog electronic signal and anti-phase analog electronic signal.
In a preferred embodiment of the present invention, noninverting analog electronic signal is identical with analog electronic signal homophase and current potential, and anti-phase analog electronic signal is the inversion signal of noninverting analog electronic signal.
In a preferred embodiment of the present invention, noninverting analog electronic signal and analog electronic signal homophase, and the current potential of the current potential analog electronic signal of noninverting analog electronic signal adds bias, and anti-phase analog electronic signal is the inversion signal of noninverting analog electronic signal.
In a preferred embodiment of the present invention, noninverting analog electronic signal and analog electronic signal homophase, and the current potential of the current potential analog electronic signal of noninverting analog electronic signal deducts bias, and anti-phase analog electronic signal is the inversion signal of noninverting analog electronic signal.
In sum, the analog electronic signal of the image capture element in the scanister is transmitted in the present invention in differential right mode, and make the original analog electronic signal of transmission on the signal wire, transmission is identical with original analog electronic signal current potential on another signal wire, but anti-phase signal therefore can be so that the original electromagnetic interference (EMI) that analog electronic signal produced mutually offsets.
Description of drawings
Fig. 1 is the functional-block diagram of known a kind of scanister;
Fig. 2 is the waveform of known a kind of analog electronic signal that is transmitted with single-ended mode;
Fig. 3 is the functional-block diagram with differential scanister to the mode transfer analog electronic signal according to a preferred embodiment of the present invention; And
Fig. 4 is the waveform according to the differential analog electronic signal of a preferred embodiment of the present invention.
10,30: scanister
102,302: image capture element board mainboard
104,204: mainboard
106,306: the image capture element
108,312: AFE (analog front end)
110,314: analog-to-digital converter
112,316: image capture element clock generator
308: differential output driver
310: differential input sink
Embodiment
Please refer to Fig. 3, it is the functional-block diagram with differential scanister to the mode transfer analog electronic signal according to a preferred embodiment of the present invention.As shown in Figure 3, scanister 30 comprises image capture element board 302 (for example being the CCD plate) and mainboard 304.Image capture element board 302 links by a cable mutually with mainboard 304.Above-mentioned image capture element board 302 comprises that image capture element 306 (for example is CCD, contact-type image inductor (ContactImage Sensor, be called for short CIS) or CMOS (Complementary Metal Oxide Semiconductor) (ComplementaryMetal-Oxide Semiconductor is called for short CMOS) inductor) and differential output driver 308.And above-mentioned mainboard 304 comprises differential input sink 310, AFE (analog front end) 312, analog-to-digital converter 314 and image capture element clock generator 316.The beneath function that the each several part of scanister 30 will be described.
The optical signalling of above-mentioned image capture element 306 gained when receiving scanning document, and optical signalling done opto-electronic conversion and export analog electronic signal.Above-mentioned differential output driver 308 is in order to convert analog electronic signal differential mode to and to export differential analog electronic signal.The waveform of this differential analog electronic signal please refer to Fig. 4, and it is the waveform according to the differential analog electronic signal of a preferred embodiment of the present invention.As shown in Figure 4, differential analog electronic signal comprises the analog electronic signal v with Fig. 2
IThe noninverting analog electronic signal v of identical (homophase and current potential are identical)
O1(current potential is V
Os) and with the analog electronic signal v of Fig. 2
IThe anti-phase analog electronic signal v that current potential is identical but anti-phase
O2(current potential is-V
Os).By Fig. 4 also as can be known, because the current potential of differential analog electronic signal moment is zero, when the differential output driver 308 of dynamic simulated electronic signal from image capture element board 302 of therefore being on duty is sent to differential input sink 310 on the mainboard 304, EMI is mutually offsetted and reduces the suffered EMI of scanister 30.In addition, noninverting analog electronic signal v
O1Can with analog electronic signal v
IHomophase, but the current potential v of noninverting analog electronic signal
O1Be analog electronic signal v
ICurrent potential add bias, and anti-phase analog electronic signal v
O2Be noninverting analog electronic signal v
O1Inversion signal (not illustrating); Or noninverting analog electronic signal v
O1Can with analog electronic signal v
IHomophase, but noninverting analog electronic signal v
O1Current potential be analog electronic signal v
ICurrent potential deduct bias, and anti-phase analog electronic signal v
O2Be noninverting analog electronic signal v
O1Inversion signal (not illustrating).Above-mentioned differential input sink 310 is in order to receiving differential analog electronic signal, and differential analog electronic signal is reduced into analog electronic signal.Above-mentioned AFE (analog front end) 312 is in order to convert analog electronic signal to the AFE (analog front end) electronic signal.Above-mentioned analog-to-digital converter 314 is simulated to digital conversion in order to the AFE (analog front end) electronic signal is done, and the output digital electronic signal.And above-mentioned image capture element clock generator 316 is in order to provide several clock signals to image capture element 306, to drive image capture element 306.
Next the How It Works of scanister 30 will be described.At first, image capture element clock generator 316 can provide several clock signals to image capture element 306, to drive image capture element 306.Then, image capture element 306 is understood the optical signalling of gained when receiving scanning documents, and optical signalling is done opto-electronic conversion and exported analog electronic signal.Then, differential output driver 308 can convert analog electronic signal differential mode to and export differential analog electronic signal.Next, differential input sink 310 can receive differential analog electronic signal, and differential analog electronic signal is reduced into analog electronic signal.Afterwards, AFE (analog front end) 312 can convert analog electronic signal to the AFE (analog front end) electronic signal, and passes through analog-to-digital converter 314, and the AFE (analog front end) electronic signal is done simulated to digital conversion, and the output digital electronic signal.
From the above, the present invention is that the analog electronic signal that will originally be sent to mainboard 304 from image capture element board 302 changes with differential right pattern and transmits, and therefore EMI is mutually offsetted.
In sum, the analog electronic signal of the image capture element in the scanister is transmitted in the present invention in differential right mode, and make the original analog electronic signal of transmission on the signal wire, transmission is identical with original analog electronic signal current potential on another signal wire, but anti-phase signal therefore can be so that the original electromagnetic interference (EMI) that analog electronic signal produced mutually offsets.
Claims (13)
1. one kind with differential scanister to the mode transfer analog electronic signal, it is characterized in that this scanister comprises:
One image capture element board comprises:
One image capture element, this element receives an optical signalling of gained when scanning a file, and this optical signalling is done opto-electronic conversion and exported an analog electronic signal; And
One differential output driver is coupled to this image capture element, and this driver converts this analog electronic signal differential mode to and exports a differential analog electronic signal; And
One mainboard is coupled to this image capture element board, comprising:
One differential input sink, this receiver receives this differential analog electronic signal, and should be reduced into this analog electronic signal by differential analog electronic signal.
2. as claimed in claim 1ly it is characterized in that with differential scanister this differential analog electronic signal comprises a noninverting analog electronic signal and an anti-phase analog electronic signal to the mode transfer analog electronic signal.
3. as claimed in claim 1ly it is characterized in that with differential scanister this mainboard more comprises to the mode transfer analog electronic signal:
One AFE (analog front end) is coupled to this differential input sink, converts this analog electronic signal to an AFE (analog front end) electronic signal; And
One analog-to-digital converter is coupled to this AFE (analog front end), this AFE (analog front end) electronic signal is done simulated to digital conversion, and export a digital electronic signal.
4. as claimed in claim 1ly it is characterized in that with differential scanister this mainboard more comprises an image capture element clock generator, provide a plurality of clock signals to this image capture element, to drive this image capture element to the mode transfer analog electronic signal.
5. as claimed in claim 1ly it is characterized in that with differential scanister this image capture element board is a charge coupled cell to the mode transfer analog electronic signal.
6. as claimed in claim 1ly it is characterized in that with differential scanister this image capture element board is a contact-type image inductor to the mode transfer analog electronic signal.
7. as claimed in claim 1ly it is characterized in that with differential scanister this image capture element board is a CMOS (Complementary Metal Oxide Semiconductor) inductor to the mode transfer analog electronic signal.
8. the How It Works with differential scanister to the mode transfer analog electronic signal is characterized in that this How It Works comprises the following steps:
Receive an optical signalling of gained when scanning a file, and this optical signalling is done opto-electronic conversion and exported an analog electronic signal;
This analog electronic signal is converted to differential mode and exports a differential analog electronic signal; And
Receive this differential analog electronic signal, and should be reduced into this analog electronic signal by differential analog electronic signal.
9. the How It Works with differential scanister to the mode transfer analog electronic signal as claimed in claim 8 is characterized in that this How It Works more comprises:
Convert this analog electronic signal to an AFE (analog front end) electronic signal; And
This AFE (analog front end) electronic signal done simulate, and export a digital electronic signal to digital conversion.
10. the How It Works with differential scanister to the mode transfer analog electronic signal as claimed in claim 8 is characterized in that this differential analog electronic signal comprises a noninverting analog electronic signal and an anti-phase analog electronic signal.
11. the How It Works with differential scanister to the mode transfer analog electronic signal as claimed in claim 10, it is characterized in that, this noninverting analog electronic signal is identical with this analog electronic signal homophase and current potential, and the inversion signal that this anti-phase analog electronic signal is this noninverting analog electronic signal.
12. the How It Works with differential scanister to the mode transfer analog electronic signal as claimed in claim 10, it is characterized in that, this noninverting analog electronic signal and this analog electronic signal homophase, and the current potential of this noninverting analog electronic signal adds a bias for the current potential of this analog electronic signal, and the inversion signal that this anti-phase analog electronic signal is this noninverting analog electronic signal.
13. the How It Works with differential scanister to the mode transfer analog electronic signal as claimed in claim 10, it is characterized in that, this noninverting analog electronic signal and this analog electronic signal homophase, and the current potential of this noninverting analog electronic signal deducts a bias for the current potential of this analog electronic signal, and the inversion signal that this anti-phase analog electronic signal is this noninverting analog electronic signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021462755A CN1490759A (en) | 2002-10-17 | 2002-10-17 | Scanner for transmitting analog electronic signals in differential pairs and its operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021462755A CN1490759A (en) | 2002-10-17 | 2002-10-17 | Scanner for transmitting analog electronic signals in differential pairs and its operation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1490759A true CN1490759A (en) | 2004-04-21 |
Family
ID=34148639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021462755A Withdrawn CN1490759A (en) | 2002-10-17 | 2002-10-17 | Scanner for transmitting analog electronic signals in differential pairs and its operation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1490759A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100388332C (en) * | 2004-10-15 | 2008-05-14 | 友达光电股份有限公司 | Method and device for reducing electromagnetic interference using plane display |
| WO2015081581A1 (en) * | 2013-12-03 | 2015-06-11 | 深圳市华星光电技术有限公司 | Method for avoiding interference in pulse signal and terminal applicable thereto |
-
2002
- 2002-10-17 CN CNA021462755A patent/CN1490759A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100388332C (en) * | 2004-10-15 | 2008-05-14 | 友达光电股份有限公司 | Method and device for reducing electromagnetic interference using plane display |
| WO2015081581A1 (en) * | 2013-12-03 | 2015-06-11 | 深圳市华星光电技术有限公司 | Method for avoiding interference in pulse signal and terminal applicable thereto |
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| PB01 | Publication | ||
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| C04 | Withdrawal of patent application after publication (patent law 2001) | ||
| WW01 | Invention patent application withdrawn after publication |