CN1209874C - Low voltage differential signal transmission device - Google Patents
Low voltage differential signal transmission device Download PDFInfo
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- CN1209874C CN1209874C CN 02159332 CN02159332A CN1209874C CN 1209874 C CN1209874 C CN 1209874C CN 02159332 CN02159332 CN 02159332 CN 02159332 A CN02159332 A CN 02159332A CN 1209874 C CN1209874 C CN 1209874C
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Abstract
The present invention relates to a low voltage differential signal transmission device which at least comprises a signal driving circuit and a signal compensation circuit, wherein the signal driving circuit is used for producing and outputting an analog video signal to a low voltage differential signal receiving device, the signal compensation circuit is electrically connected with the signal driving circuit, and the signal compensating circuit can generate a feedback compensation signal to the signal driving circuit because of the analog image signal and a reference signal, so the signal driving circuit can provide the stable analog image signal to be used for the low voltage differential signal receiving device. The present invention can reduce the signal fluxionary negative influence on the signal driving circuit caused by manufacturing process factors, and the accurate and stable analog video signal can be guaranteed to be inputted by the low voltage differential signal receiving device.
Description
Technical field
The present invention relates to a kind of Low Voltage Differential Signal conveyer, refer to especially a kind ofly have, so that the Low Voltage Differential Signal of stablizing output function conveyer to be provided with the output signal feedback compensation.
Background technology
Get over universal along with the Internet, communication miscellaneous and transmission equipment also day by day are subjected to consumer's welcome, make the rapid increase of demand of transfer of data.In addition, numeral shows that video signal, high definition television and coloured image all need higher frequency range to support data streaming.System design engineer just must rely on analogue technique design circuit system and support transfer of data if want transferring large number of data.Low Voltage Differential Signal (Low Voltage Differential Signaling, be called for short LVDS) transmission technology is so a kind of analogue technique, and system design engineer can be utilized this art designs mixed-signal system.LVDS adopts the high speed analog circuit technology, and can guarantee that copper conductor can support the transfer of data of kilomegabit above (multi-gigabit).
Because LVDS is a kind of speed height, power is low and can reduce the universal interface standard of noise jamming, be suitable for high speed data transfer, therefore, with needs the digital image signal modulation is become the analog image signal, and the system configuration that is transferred to the digital display screen at high speed is example, promptly is the applications well target of LVDS transmission technology.
See also Fig. 1, it is the digital display system configuration example figure of an application LVDS transmission technology; In Fig. 1, include a basic computer 10 and and show main body 20 (for example, being a LCD display).Wherein, one image control chip 101 of these basic computer 10 inside is in order to export in the known Low Voltage Differential Signal conveyer 102 of a digital video signal S1 to, afterwards, modulating signal action by this known Low Voltage Differential Signal conveyer 102, with the analog image signal S10 that this digital video signal S1 modulation become to have the low signal amplitude of oscillation (low-swing) (for example, the low voltage signal amplitude of oscillation with 300mV～350mV), and, make this analog image signal S10 export a Low Voltage Differential Signal receiving system 201 places to by a known Low Voltage Differential Signal drive circuit 1021.
Because, input end in this Low Voltage Differential Signal receiving system 201 comprises that at least the resistance of two serial connections (please cooperates to consult among second figure in advance and indicates R1, R2 person, and for example, this two resistance R 1, R2 can be two 50 Ohmic resistances), therefore, this Low Voltage Differential Signal receiving system 201 can be in order to receive this analog image signal S10, and can carry out the action that modulation returns this digital image signal S1 to it, use for follow-up processing unit (comprising a sequential control device 202, a display drive apparatus 203 or the like at least) with output.
For further disclosing this known Low Voltage Differential Signal drive circuit 1021 shown in Fig. 1, see also Fig. 2, it is the partial interior circuit structure exemplary plot in this known Low Voltage Differential Signal drive circuit 1021.In Fig. 2, transistor Q1～Q4 is in order to constituting one group of differential amplifier, as the main body that drives output, and produces this two resistance R 1, the R2 place of output this analog image signal S10 (voltage amplitude is Va) to this Low Voltage Differential Signal receiving system 201.As for transistor Q5 and transistor Q6, Q7, form first and second current source respectively, and this first current source is electrically connected between one power supply+Vcc and this group differential amplifier, and this second current source then is electrically connected on this group differential amplifier (this transistor Q6, Q7 are electrically connected on parallel way) between an earth terminal; By this first and second current source, can provide a constant current source Io to use to this group differential amplifier.In addition, transistor Q8 then can make the change in voltage of this constant current source Io stable.
The disappearance of the known Low Voltage Differential Signal conveyer 102 of this shown in Fig. 1,2 is: its inside is to overcome the output signal drift problem that is caused from the processing procedure factor in order to export this known Low Voltage Differential Signal drive circuit 1021 of this analog image signal S10.This transistor Q5 among Fig. 2 (being this first current source) and this transistor Q6, Q7 (for this second current source), in manufacture process, can cause physical characteristic inconsistent because of the processing procedure factor, and this will make and offer the current source Io that this group differential amplifier (Q1～Q4 constitutes by this transistor) uses, can occur the signal drift and with the phenomenon of original design off-gauge.So this group differential amplifier is exported the signal swing of this analog image signal S10, also can depart from original scope of design thereupon, and cause the misoperation of follow-up this Low Voltage Differential Signal receiving system 201 linkedly.
Summary of the invention
Main purpose of the present invention be for provide a kind of overcome because of the processing procedure factor to avoid producing the Low Voltage Differential Signal conveyer of the output signal that is not inconsistent the original design specification.
Secondary objective of the present invention is output signal can be carried out feedback compensation in order to provide a kind of, to stablize the Low Voltage Differential Signal conveyer of this output signal.
Purpose of the present invention can realize by following measure:
The invention provides a kind of Low Voltage Differential Signal (LVDS) conveyer, comprise at least: a signal drive circuit, it is in order to produce in output one analog image signal to the Low Voltage Differential Signal receiving system; And a signal compensation circuit, being electrically connected on this signal drive circuit, this signal compensation circuit comprises first and second shunt resistance, a voltage-current converter circuit, first and second current mirroring circuit; Wherein, this first and second shunt resistance is electrically connected between this signal drive circuit and this voltage-current converter circuit, in order to this analog image signal shunting is inputed in this voltage-current converter circuit; This voltage-current converter circuit is according to the voltage difference between this analog image signal imported and a reference signal, and conversion produces the feedback compensation signal of electric current pattern; This first current mirroring circuit is electrically connected between this voltage-current converter circuit and the earth terminal, and the differential wave that this second current mirroring circuit is electrically connected in this first current mirroring circuit, a power supply and this signal drive circuit produces between the circuit; This first and second current mirroring circuit feeds back to this feedback compensation signal in this signal drive circuit, the current signal variation that is produced with one first current source that compensates in this signal drive circuit is so that this signal drive circuit provides a stable analog image signal to use to this Low Voltage Differential Signal receiving system.
According to the above-mentioned conception of the present invention, wherein this signal drive circuit can comprise that first and second current source and a differential wave produce circuit.
According to the above-mentioned conception of the present invention, wherein this first current source can be made of a transistor that is electrically connected between a power supply and this differential wave generation circuit.
According to the above-mentioned conception of the present invention, wherein this second current source can be made of two transistors that are electrically connected between an earth terminal and this differential wave generation circuit at least.
According to the above-mentioned conception of the present invention, wherein this differential wave generation circuit comprises four transistors at least.
According to the above-mentioned conception of the present invention, wherein this analog image signal has the low voltage signal amplitude of oscillation of 300mV～350mV.
According to the above-mentioned conception of the present invention, wherein this first and second current mirroring circuit all respectively comprises two transistors.
According to the above-mentioned conception of the present invention, wherein this reference signal can be by energy rank (Band-gap) the energy rank voltage signal that circuit produced.
According to the above-mentioned conception of the present invention, wherein comprise the resistance of two serial connections in this Low Voltage Differential Signal receiving system at least, and this two resistance is electrically connected on this signal drive circuit respectively, to receive this analog image signal.
The present invention also provides a kind of signal compensation circuit, it is located in Low Voltage Differential Signal (LVDS) conveyer that includes a signal drive circuit, this signal compensation circuit comprises: first and second shunt resistance, be electrically connected between this signal drive circuit and this signaling conversion circuit, in order to this analog image signal is shunted; One signaling conversion circuit, it can be imported a reference signal and receive the analog image signal that this first and second shunt resistance is shunted, and according between the two signal difference, produces a feedback compensation signal with conversion; And a current mirroring circuit, being electrically connected between this signaling conversion circuit and this signal drive circuit, this current mirroring circuit comprises first and second current mirroring circuit at least; Wherein this first current mirroring circuit is electrically connected between this signaling conversion circuit and the earth terminal, and the differential wave that this second current mirroring circuit is electrically connected in this first current mirroring circuit, a power supply and this signal drive circuit produces between the circuit; This first and second current mirroring circuit feeds back to this feedback compensation signal in this signal drive circuit, the current signal variation that is produced with one first current source that compensates in this signal drive circuit is so that this signal drive circuit provides a stable analog image signal.
According to the above-mentioned conception of the present invention, wherein this signal drive circuit can comprise that first and second current source and a differential wave produce circuit.
According to the above-mentioned conception of the present invention, wherein this first current source can one of produce between the circuit transistor and constituted by being electrically connected on a power supply and this differential wave.
According to the above-mentioned conception of the present invention, wherein this second current source can be made of two transistors that are electrically connected between an earth terminal and this differential wave generation circuit at least.
According to the above-mentioned conception of the present invention, wherein this differential wave generation circuit comprises four transistors at least.
According to the above-mentioned conception of the present invention, wherein this signaling conversion circuit can be a voltage-current converter circuit (V/I converter), is this signal difference of voltage pattern with the basis, and conversion produces this feedback compensation signal of electric current pattern.
According to the above-mentioned conception of the present invention, wherein this reference signal can by one can rank circuit produced one can the rank voltage signal.
According to the above-mentioned conception of the present invention, wherein this analog image signal has the low voltage signal amplitude of oscillation of 300mV～350mV.
According to the above-mentioned conception of the present invention, wherein this first and second current mirroring circuit all respectively comprises two transistors.
According to the above-mentioned conception of the present invention, wherein this signal drive circuit can be electrically connected on a Low Voltage Differential Signal receiving system, so that this analog image signal is exported in this Low Voltage Differential Signal receiving system.
According to the above-mentioned conception of the present invention, wherein comprise the resistance of two serial connections in this Low Voltage Differential Signal receiving system at least, and this two resistance is electrically connected on this signal drive circuit respectively, to receive this analog image signal.
The present invention has following advantage compared to existing technology:
The present invention can reduce the negative effect that causes this signal drive circuit generation signal change because of the processing procedure factor, can import this accurate, stable analog image signal to guarantee this Low Voltage Differential Signal receiving system.
Description of drawings
Fig. 1 is the digital display system architecture block diagram of a known application LVDS transmission technology.
Fig. 2 is the partial interior electrical block diagram in the known Low Voltage Differential Signal drive circuit.
Fig. 3 is a preferred embodiment figure of Low Voltage Differential Signal conveyer of the present invention.
Fig. 4 is the Low Voltage Differential Signal drive circuit in the Low Voltage Differential Signal conveyer of the present invention and the partial interior electrical block diagram of current source signal compensating circuit.
Fig. 5 can rank circuit inner structure schematic diagram for producing one of reference signal among the present invention.
Embodiment
For further disclosing the present invention, see also Fig. 3, it is a preferable exemplifying embodiment figure of Low Voltage Differential Signal conveyer among the present invention; Certainly, also please cooperate in the lump and consult that shown in Figure 1.
This image control chip 101 shown in Fig. 3 in this basic computer 10, this demonstration main body 20 and digital image signal S1, analog image signal S10, its function, structure do not repeat them here all as shown in Figure 1.In addition, the Low Voltage Differential Signal conveyer 103 that this basic computer 10 is had, its inside also is provided with the Low Voltage Differential Signal drive circuit 1031 with these known Low Voltage Differential Signal drive circuit 1021 tool identical functions, structure.
Fig. 3 and Fig. 1 different be in: the output at this Low Voltage Differential Signal drive circuit 1031 more is electrically connected with a current source signal compensating circuit 1032.By this current source signal compensating circuit 1032, the output signal (being this analog image signal S10 among Fig. 1) of this Low Voltage Differential Signal drive circuit 1031 can be compared with a reference signal VBG who fixes, to incite somebody to action signal difference between the two, fed back to this Low Voltage Differential Signal drive circuit 1031, thus, can improve the signal drift phenomenon that causes the physical characteristic of assembly in this Low Voltage Differential Signal drive circuit 1031 to change and caused because of the processing procedure factor.
See also Fig. 4 again, be the partial interior electrical block diagram of the Low Voltage Differential Signal drive circuit in this Low Voltage Differential Signal conveyer 103 of the present invention 1031 with this current source signal compensating circuit 1032.
In Fig. 4, partial interior circuit structure because of this Low Voltage Differential Signal drive circuit 1031, with and this analog image signal S10 is exported to the electrical connection of this Low Voltage Differential Signal receiving system 201, with this known Low Voltage Differential Signal drive circuit 1021 shown in Figure 2 and identical, do not repeat them here with the electrical connection of 201 of this Low Voltage Differential Signal receiving systems.As for, 1032 of this current source signal compensating circuits comprise: first and second shunt resistance R3, R4, a voltage-current converter circuit (V/I converter) 10321 and 1 first current mirroring circuit (being formed) by transistor Q12, Q13, with one second current mirroring circuit (being formed) by transistor Q14, Q15; Wherein, this first and second shunt resistance R3, R4 are electrically connected on respectively between this Low Voltage Differential Signal drive circuit 1031 and this voltage-current converter circuit 10321, it inputs in this voltage-current converter circuit 10321 in order to will originally export this analog image signal S10 in this Low Voltage Differential Signal receiving system 201 to, and to be shunted.As for this voltage-current converter circuit 10321, then constituted by transistor Q9～Q11, this voltage-current converter circuit 10321 can produce the feedback compensation signal Io1 of electric current pattern according to the voltage difference between this analog image signal S10 that is imported and this reference signal VBG with conversion.
And then, by transistor Q12, this first current mirroring circuit that Q13 formed, because of it is electrically connected between this voltage-current converter circuit 10321 and the earth terminal, and by transistor Q14, this second current mirroring circuit that Q15 formed, be electrically connected on this first current mirroring circuit, this power Vcc+and this Low Voltage Differential Signal drive circuit 1031 in this group differential amplifier (being formed) by this transistor Q1～Q4 between, therefore, this first and second current mirroring circuit can be fed back to this feedback compensation signal Io1 in this low-voltage difference signal drive circuit 1031, the current signal variation that is produced with this first current source (i.e. this transistor Q5) that compensates in this Low Voltage Differential Signal drive circuit 1031, so that a fixing current source I1 to be provided, so that this Low Voltage Differential Signal drive circuit 1031 produces a stable analog image signal S10.
For example, as this transistor Q5 when to cause the magnitude of current of this constant current source Io of its output that produces be high because of the processing procedure factor than the original design value, by this first and second shunt resistance R3, R4 and shunt the signal strength signal intensity that inputs to these voltage-current converter circuit 10321 places, obviously also can increase thereupon, so can keep a fixed value all the time because of this reference signal VBG, therefore, voltage difference between this analog image signal S10 and this reference signal VBG promptly can reduce, and thereby changes this feedback compensation signal Io1 that produces the output current pattern by this voltage-current converter circuit 10321 and also can reduce thereupon.Be with, afterwards via the mirror effect of this first and second current mirroring circuit,, electric current equally also can occur and reduce phenomenon at this transistor Q15 place.Thus, though the magnitude of current of this constant current source Io raises, so the magnitude of current because of this feedback compensation signal Io1 but is oppositely to reduce the magnitude of current, be with, this current source I1 that is made up of this constant current source Io and this feedback compensation signal Io1 still can keep a fixed value, this will make this group differential amplifier (being made up of this transistor Q1～Q4) of input this current source I1, all the time can produce this analog image signal S10 of the fixed signal amplitude of oscillation, to avoid changing the original design scope of this analog image signal S10 because of the processing procedure factor.
Certainly, employed this reference signal VBG among the present invention can be the energy rank voltage signal that circuit produced by energy rank (Band-gap); Though the internal circuit configuration of this energy rank circuit is a known technology, right in further disclosing enforcement notion of the present invention, now be a simple declaration with its internal circuit structure with Fig. 5: wherein, by the voltage difference between transistor QA shown in Figure 5, both base-emitter voltages of QB, can produce an electric current I at the resistance R place and form a magnitude of voltage, and can produce this reference signal of output VBG at transistor QC place by voltage comparator C.
By way of the present invention, can one simply, mode cheaply, make stable output signal that the Low Voltage Differential Signal conveyer produces in the original design scope and can not change along with the processing procedure factor.
Claims (6)
1. Low Voltage Differential Signal conveyer comprises at least:
One signal drive circuit, it is in order to produce in output one analog image signal to the Low Voltage Differential Signal receiving system; And
One signal compensation circuit is electrically connected on this signal drive circuit, and this signal compensation circuit comprises first and second shunt resistance, a differential amplifier circuit, first and second current mirroring circuit;
Wherein, this first and second shunt resistance is electrically connected between the input of the output of this signal drive circuit and this differential amplifier circuit, in order to this analog image signal shunting is inputed in this differential amplifier circuit;
This differential amplifier circuit is according to the voltage difference between this analog image signal imported and a reference signal, and conversion produces the feedback compensation signal of electric current pattern;
This first current mirroring circuit is electrically connected between the output and an earth terminal of this differential amplifier circuit, and this second current mirroring circuit is series between the output and a power supply of this first current mirroring circuit, and is in parallel with one first current source in this signal drive circuit; This first and second current mirroring circuit feeds back to this feedback compensation signal in this signal drive circuit, the current signal variation that is produced with this first current source that compensates in this signal drive circuit is so that this signal drive circuit provides a stable analog image signal to use to this Low Voltage Differential Signal receiving system.
2. Low Voltage Differential Signal conveyer as claimed in claim 1 is characterized in that this signal drive circuit is included in this first current source, a differential wave of connecting successively between power supply and the earth terminal and produces circuit and one second current source.
3. Low Voltage Differential Signal conveyer as claimed in claim 1 is characterized in that this reference signal is the energy rank voltage signal that an energy rank circuit is produced.
4. signal compensation circuit, it is located in the Low Voltage Differential Signal conveyer that includes a signal drive circuit, and this signal compensation circuit comprises first and second shunt resistance, a differential amplifier circuit, a current mirroring circuit;
This first and second shunt resistance is electrically connected between the input of the output of this signal drive circuit and this differential amplifier circuit, in order to this analog image signal shunting;
This differential amplifier circuit can be imported a reference signal and receive this analog image signal that this first and second shunt resistance is shunted, and according between the two signal difference, produces a feedback compensation signal with conversion; And
This current mirroring circuit is electrically connected between this differential amplifier circuit and this signal drive circuit, and comprises first and second current mirroring circuit at least; Wherein this first current mirroring circuit is electrically connected between the output and an earth terminal of this differential amplifier circuit, and this second current mirroring circuit is series between the output and a power supply of this first current mirroring circuit, and is in parallel with one first current source in this signal drive circuit; This first and second current mirroring circuit feeds back to this feedback compensation signal in this signal drive circuit, the current signal variation that is produced with one first current source that compensates in this signal drive circuit is so that this signal drive circuit provides a stable analog image signal.
5. signal compensation circuit as claimed in claim 4 is characterized in that this signal drive circuit is included in this first current source, a differential wave of connecting successively between power supply and the earth terminal and produces circuit and one second current source.
6. signal compensation circuit as claimed in claim 4 is characterized in that this differential amplifier circuit is a voltage-current converter circuit, is this signal difference of voltage pattern with the basis, and conversion produces the feedback compensation signal of electric current pattern; And the energy rank voltage signal of this reference signal for being produced by an energy rank circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02159332 CN1209874C (en) | 2002-12-26 | 2002-12-26 | Low voltage differential signal transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02159332 CN1209874C (en) | 2002-12-26 | 2002-12-26 | Low voltage differential signal transmission device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1426166A CN1426166A (en) | 2003-06-25 |
| CN1209874C true CN1209874C (en) | 2005-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02159332 Expired - Lifetime CN1209874C (en) | 2002-12-26 | 2002-12-26 | Low voltage differential signal transmission device |
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| CN (1) | CN1209874C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7218141B2 (en) * | 2004-12-07 | 2007-05-15 | Altera Corporation | Techniques for implementing hardwired decoders in differential input circuits |
| CN103149961B (en) * | 2011-12-06 | 2014-10-22 | 扬智科技股份有限公司 | Current supplier and method thereof |
| TWI511454B (en) * | 2012-11-26 | 2015-12-01 | Via Tech Inc | Low voltage differential signal driving circuit and electronic device compatible with wired transmission |
| US9083584B2 (en) * | 2013-08-16 | 2015-07-14 | Via Technologies, Inc. | Common mode modulation with current compensation |
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2002
- 2002-12-26 CN CN 02159332 patent/CN1209874C/en not_active Expired - Lifetime
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| CN1426166A (en) | 2003-06-25 |
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