CN103414933A - Analog video signal output device and electronic device - Google Patents

Analog video signal output device and electronic device Download PDF

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Publication number
CN103414933A
CN103414933A CN201310323203XA CN201310323203A CN103414933A CN 103414933 A CN103414933 A CN 103414933A CN 201310323203X A CN201310323203X A CN 201310323203XA CN 201310323203 A CN201310323203 A CN 201310323203A CN 103414933 A CN103414933 A CN 103414933A
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triode
resistance
power supply
circuit
video signal
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CN201310323203XA
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CN103414933B (en
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辜克群
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

An embodiment of the invention discloses an analog video signal output device and an electronic device. The analog video signal output device can comprise a video signal output circuit, a DC blocking circuit, a bias circuit, a detection circuit and a power-supplying switch circuit used for supplying power to the video signal output circuit; the video signal output circuit is used for outputting analog video signals to an analog video signal output port; the detection circuit is used for detecting whether the port voltage value of the analog video signal output port is larger than a preset voltage threshold value, when the port voltage value of the analog video signal output port is detected to be larger than the preset voltage threshold value, the power-supplying switch circuit is controlled to be in a power-supplying shut-down state; when the port voltage value of the analog video signal output port is smaller than a preset voltage threshold value, the power-supplying switch circuit is controlled to be in a power-supplying state. According to the technical scheme, the analog video signal output device and the electronic device are beneficial to reducing non-load power consumption of the analog video signal output port to some extent, and low-carbon environment-protection rate is improved.

Description

Analog video signal output device and electronic equipment
Technical field
The present invention relates to the electronic circuit technology field, be specifically related to analog video signal output device and electronic equipment.
Background technology
Along with the development of digital television techniques, digital TV set-top box is more and more general, the existing indispensable audio & video equipment of each family's TV reception that developed into.And as the wider electronic product of a kind of popularization, the power consumption size of Set Top Box has become the direct embodiment of the competitiveness of this kind product, and every country is put into effect the relevant efficiency instruction of Set Top Box in succession, and its purpose is that vectoring aircraft top box product strides forward towards the target of low-power consumption.Therefore, how to reduce Set Top Box product power consumption, now become the important research direction of each Set Top Box producer.
Difference according to signal transmission network and modulation technique, Set Top Box is divided into polytype, digital video broadcast for cable (DVB-C for example, Digital Video Broadcasting-C) Set Top Box, satellite digital video broadcast (DVB-S) Set Top Box, digital video broadcast-terrestrial (DVB-T) Set Top Box etc.The common analog video signal output port of Set Top Box comprises: S terminal (S-Video), component video signal output port and composite video signal (CVBS, Composite Video Broadcast Signal) one or more among output port, when user's TV reception, a kind of in above-mentioned video interface received to television set by connecting line and can watch program.
At present, the analog video signal output port of Set Top Box is not supported hot plug, and when no matter whether port was in Light Condition, its interlock circuit (as video signal output circuit) etc. were all in running order, thereby have appreciable power consumption.
Summary of the invention
Embodiments of the invention provide a kind of analog video signal output device and electronic equipment, to reducing to a certain extent the no-load power consumption of analog video signal output port, promote the low-carbon environment-friendly rate.
First aspect present invention provides a kind of analog video signal output device, and for by the analog video signal output port, exporting analog video signal to terminal equipment, the analog video signal output device can comprise:
Video signal output circuit, block isolating circuit, biasing circuit, testing circuit and the switching circuit of power supply that is used to described video signal output circuit to power;
Wherein, described video signal output circuit is for exporting analog video signal via described block isolating circuit and biasing circuit to described analog video signal output port;
Described block isolating circuit is for the DC component of the described analog video signal of filtering before arriving described analog video signal output port at described analog video signal;
Described biasing circuit is used for the port voltage lifting of analog video signal output port, wherein, described biasing circuit comprises the first power voltage supply end, and the first resistance and the 3rd resistance of with described the first power voltage supply end, connecting, and described the 3rd grounding through resistance, described analog video signal output port are connected between described the first resistance and the 3rd resistance;
Described testing circuit is coupled to the control end of described analog video signal output port and described switching circuit of power supply, for detection of the port voltage of described analog video signal output port whether higher than default voltage threshold, at the port voltage that described analog video signal output port detected during higher than default voltage threshold, control described switching circuit of power supply and be in the power supply off state, at the port voltage that described analog video signal output port detected, during lower than described default voltage threshold, control described switching circuit of power supply and be in power supply state;
Described switching circuit of power supply further is coupled to video signal output circuit, be used for: when described switching circuit of power supply is in the power supply off state, stop described video signal output circuit power supply, when described switching circuit of power supply is in power supply state, maintain described video signal output circuit power supply.
In conjunction with first aspect, in the possible execution mode of the first, described hot plug testing circuit also comprises: twitter circuit disappears, wherein, the input of the described twitter circuit that disappears is electrically connected to described analog video signal output port, and the output of the described twitter circuit that disappears is connected with the input of described testing circuit, described disappear twitter circuit for, eliminate the shake of plug line moment generation, and filtering enters the analog video signal of the described twitter circuit that disappears from the input of the described twitter circuit that disappears.
In conjunction with the possible execution mode of the first of first aspect, in the possible execution mode of the second, the described twitter circuit that disappears comprises the first diode, the second electric capacity, the 5th resistance and the 6th resistance;
Wherein, the anode of described the first diode is electrically connected to described analog video signal output port,
The negative electrode of described the first diode is by described the 5th grounding through resistance, the negative electrode of described the first diode is also by described the 6th resistance and described the second capacity earth, and the negative electrode of described the first diode also is electrically connected to the output of described testing circuit by described the 6th resistance.
In conjunction with the possible execution mode of the second of first aspect, in the third possible execution mode,
Described testing circuit comprises: the 7th resistance, the 8th resistance and the second triode;
Wherein, the grounded emitter of described the second triode, the base stage of described the second triode is connected with the output of the described twitter circuit that disappears by described the 8th resistance, the collector electrode of described the second triode is electrically connected to the second voltage feeder ear by described the 7th resistance, and the collector electrode of described the second triode also is electrically connected to the control end of described switching circuit of power supply;
In conjunction with the possible execution mode of the second of first aspect, in the 4th kind of possible execution mode,
Described testing circuit comprises: the 7th resistance, the 8th resistance and the 5th triode;
Wherein, the source ground of described the 5th triode, the grid of described the 5th triode is connected with the output of the described twitter circuit that disappears by described the 8th resistance, the drain electrode of described the 5th triode is electrically connected to the second voltage feeder ear by described the 7th resistance, wherein, the drain electrode of described the 5th triode, as the output of described testing circuit, also is electrically connected to the control end of described switching circuit of power supply.
In conjunction with the third possible execution mode of first aspect or the 4th kind of possible execution mode of first aspect, in the 5th kind of possible execution mode, described switching circuit of power supply comprises:
The first triode, the 3rd triode, the 9th resistance, the tenth resistance and the 11 resistance,
Wherein, the grounded emitter of described the 3rd triode, the base stage of described the 3rd triode is connected by the output of described the 9th resistance and described testing circuit, the collector electrode of described the 3rd triode is electrically connected to by described the tenth resistance and described the first triode source electrode, the collector electrode of described the 3rd triode also is electrically connected to by the grid of described the 11 resistance and described the first triode, the source electrode of described the first triode also is electrically connected to the first power voltage supply end, wherein, the drain electrode of described the first triode is as the first power supply output of described switching circuit of power supply, for described video signal output circuit power supply,
Perhaps,
Described switching circuit of power supply comprises:
The 3rd triode, the 4th triode, the 9th resistance, the 13 resistance and the 14 resistance,
Wherein, the grounded emitter of described the 3rd triode, the base stage of described the 3rd triode is connected by the output of described the 9th resistance and described testing circuit; The source electrode of described the 4th triode is electrically connected to the second voltage feeder ear, the grid of described the 4th triode is electrically connected to the collector electrode of described the 3rd triode by described the 13 resistance, the source electrode of described the 4th triode also is electrically connected to the collector electrode of described the 3rd triode by the 14 resistance, wherein, the drain electrode of described the 4th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply;
Perhaps,
Described switching circuit of power supply comprises:
The first triode, the 3rd triode, the 4th triode, the 9th resistance, the tenth resistance, the 11 resistance and the 13 resistance,
Wherein, the grounded emitter of described the 3rd triode, the base stage of described the 3rd triode is connected by the output of described the 9th resistance and described testing circuit, the collector electrode of described the 3rd triode is electrically connected to by described the tenth resistance and described the first triode source electrode, the collector electrode of described the 3rd triode also is electrically connected to by the grid of described the 11 resistance and described the first triode, the source electrode of described the first triode also is electrically connected to the first power voltage supply end, wherein, the drain electrode of described the first triode is as the first power supply output of described switching circuit of power supply, for described video signal output circuit power supply, the source electrode of described the 4th triode is electrically connected to the second voltage feeder ear, the grid of described the 4th triode is electrically connected to the collector electrode of described the 3rd triode by described the 13 resistance, wherein, the drain electrode of described the 4th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply,
Perhaps,
Described switching circuit of power supply comprises:
The first triode, the 6th triode, the 9th resistance, the tenth resistance and the 11 resistance,
Wherein, the source ground of described the 6th triode, the grid of described the 6th triode is connected by the output of described the 9th resistance and described testing circuit, the drain electrode of described the 6th triode is electrically connected to by the source electrode of described the tenth resistance and described the first triode, the drain electrode of described the 3rd triode also is electrically connected to by the grid of described the 11 resistance and described the first triode, the source electrode of described the first triode also is electrically connected to the first power voltage supply end, wherein, the drain electrode of described the first triode is as the first power supply output of described switching circuit of power supply, for described video signal output circuit power supply,
Perhaps,
Described switching circuit of power supply comprises:
The 6th triode, the 4th triode, the 9th resistance, the 13 resistance and the 14 resistance;
Wherein, the source ground of described the 6th triode, the grid of described the 6th triode is connected by the output of described the 9th resistance and described testing circuit; The source electrode of described the 4th triode is electrically connected to the second voltage feeder ear, the grid of described the 4th triode is electrically connected to the drain electrode of described the 6th triode by described the 13 resistance, the source electrode of described the 4th triode also is electrically connected to the drain electrode of described the 6th triode by described the 14 resistance, wherein, the drain electrode of described the 4th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply;
Perhaps,
Described switching circuit of power supply comprises:
The first triode, the 6th triode, the 4th triode, the 9th resistance, the tenth resistance, the 11 resistance and the 13 resistance,
Wherein, the source ground of described the 6th triode, the grid of described the 6th triode is connected by the output of described the 9th resistance and described testing circuit, the drain electrode of described the 6th triode is electrically connected to by the source electrode of described the tenth resistance and described the first triode, the drain electrode of described the 3rd triode also is electrically connected to by the grid of described the 11 resistance and described the first triode, the source electrode of described the first triode also is electrically connected to the first power voltage supply end, wherein, the drain electrode of described the first triode is as the first power supply output of described switching circuit of power supply, for described video signal output circuit power supply, wherein, the source electrode of described the 4th triode is electrically connected to the second voltage feeder ear, the grid of described the 4th triode is electrically connected to the drain electrode of described the 6th triode by described the 13 resistance, wherein, the drain electrode of described the 4th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply,
Perhaps,
Described switching circuit of power supply comprises:
The 7th triode, the 6th triode, the 9th resistance, the tenth resistance and the 11 resistance,
Wherein, the source ground of described the 6th triode, the grid of described the 6th triode is connected by the output of described the 9th resistance and described testing circuit, the drain electrode of described the 6th triode is electrically connected to by the emitter of described the tenth resistance and described the 7th triode, the drain electrode of described the 3rd triode also is electrically connected to by the base stage of described the 11 resistance and described the 7th triode, the emitter of described the 7th triode also is electrically connected to the first power voltage supply end, wherein, the collector electrode of described the 7th triode is as the first power supply output of described switching circuit of power supply, for described video signal output circuit power supply,
Perhaps,
Described switching circuit of power supply comprises:
The 6th triode, the 8th triode, the 9th resistance, the 13 resistance and the 14 resistance,
Wherein, the source ground of described the 6th triode, the grid of described the 6th triode is connected by the output of described the 9th resistance and described testing circuit; The emitter of described the 8th triode is electrically connected to the second voltage feeder ear, the base stage of described the 8th triode is electrically connected to the drain electrode of described the 6th triode by described the 13 resistance, the emitter of described the 8th triode also is electrically connected to the drain electrode of described the 6th triode by the 14 resistance, wherein, the collector electrode of described the 8th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply;
Perhaps,
Described switching circuit of power supply comprises:
The 7th triode, the 6th triode, the 8th triode, the 9th resistance, the tenth resistance, the 11 resistance and the 13 resistance,
Wherein, the source ground of described the 6th triode, the grid of described the 6th triode is connected by the output of described the 9th resistance and described testing circuit, the drain electrode of described the 6th triode is electrically connected to by the emitter of described the tenth resistance and described the 7th triode, the drain electrode of described the 3rd triode also is electrically connected to by the base stage of described the 11 resistance and described the 7th triode, the emitter of described the 7th triode also is electrically connected to the first power voltage supply end, wherein, the collector electrode of described the 7th triode is as the first power supply output of described switching circuit of power supply, for described video signal output circuit power supply, the emitter of described the 8th triode is electrically connected to the second voltage feeder ear, the base stage of described the 8th triode is electrically connected to the drain electrode of described the 6th triode by described the 13 resistance, wherein, the collector electrode of described the 8th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply.
In conjunction with the possible execution mode of the first of first aspect, in the 6th kind of possible execution mode,
The described twitter circuit that disappears comprises: the second electric capacity and the 6th resistance;
Described analog video signal output port is also by described the 6th resistance and described the second capacity earth, and described analog video signal output port also is electrically connected to the output of described testing circuit by described the 6th resistance.
In conjunction with the 6th kind of possible execution mode of first aspect, in the 7th kind of possible execution mode,
Described testing circuit comprises: the 7th resistance, the 8th resistance, the 9th resistance and operational amplifier;
Wherein, the positive input terminal of described operational amplifier is connected with the output of the described twitter circuit that disappears by described the 8th resistance, the negative input end of described operational amplifier is by described the 9th grounding through resistance, the negative input end of described operational amplifier also is electrically connected to the first power voltage supply end by described the 7th resistance, and the output of described operational amplifier also is electrically connected to the control end of described switching circuit of power supply.
In conjunction with the 7th kind of possible execution mode of first aspect, in the 8th kind of possible execution mode,
Described switching circuit of power supply comprises:
The first triode, the tenth resistance and the 11 resistance,
Wherein, the source electrode of described the first triode is connected with the output of described testing circuit by described the tenth resistance, the source electrode of described the first triode also is electrically connected to the first power voltage supply end, the grid of described the first triode is connected with the output of described testing circuit by described the 11 resistance, wherein, the drain electrode of described the first triode, as the first power supply output of described switching circuit of power supply, is described video signal output circuit power supply;
Perhaps,
Described switching circuit of power supply comprises:
The 4th triode, the 13 resistance and the 14 resistance,
Wherein, the grid of described the 4th triode is connected with the output of described testing circuit by described the 13 resistance; The source electrode of described the 4th triode is connected with the output of described testing circuit by described the 14 resistance, and the source electrode of described the 4th triode also is electrically connected to the second voltage feeder ear; Wherein, the drain electrode of described the 4th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply;
Perhaps,
Described switching circuit of power supply comprises:
The 4th triode, the 13 resistance, the first triode, the tenth resistance and the 11 resistance,
Wherein, the source electrode of described the first triode is connected with the output of described testing circuit by described the tenth resistance, the source electrode of described the first triode also is electrically connected to the first power voltage supply end, the grid of described the first triode is connected with the output of described testing circuit by described the 11 resistance, wherein, the drain electrode of described the first triode, as the first power supply output of described switching circuit of power supply, is described video signal output circuit power supply; The grid of described the 4th triode is connected with the output of described testing circuit by described the 13 resistance; The source electrode of described the 4th triode also is electrically connected to the second voltage feeder ear; Wherein, the drain electrode of described the 4th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply.
Second aspect present invention also provides a kind of electronic equipment, can comprise:
Any one analog video signal output device that master chip, the embodiment of the present invention be connected with described master chip provide;
Described master chip is for generating described analog video signal.
Therefore the analog video signal output device that the embodiment of the present invention provides mainly comprises: video signal output circuit, block isolating circuit, biasing circuit, testing circuit and the switching circuit of power supply that is used to video signal output circuit to power; Wherein, the DC component of the analog video signal exported for the filtering video signal output circuit of block isolating circuit; Biasing circuit is used for the port voltage lifting of analog video signal output port; Testing circuit for detection of the port voltage of analog video signal output port whether higher than default voltage threshold, at the port voltage that the analog video signal output port detected during higher than default voltage threshold, control switching circuit of power supply and be in the power supply off state, and can during lower than default voltage threshold, control switching circuit of power supply and be in power supply state at the port voltage that the analog video signal output port detected.Due to inserting of analog video signal output port, the port voltage that the state of pulling out reflects is not identical, therefore by introducing block isolating circuit, biasing circuit and testing circuit etc., be conducive to detect timely and effectively inserting of analog video signal output port, pull out state, whether and then to be conducive to control timely and effectively switching circuit of power supply be the video signal output circuit power supply, when unloaded, electric switch circuit is no longer video signal output circuit (energy consumption of video signal output circuit is relatively high) power supply, therefore, can solve to a certain extent the no-load power consumption problem of analog video signal output port, promote low-carbon environment-friendly efficiency.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1～Figure 18 is the schematic diagram of several analog video signal output devices of providing of the embodiment of the present invention;
Figure 19 is the schematic diagram of a kind of electronic equipment of providing of the embodiment of the present invention.
Embodiment
Embodiments of the invention provide a kind of analog video signal output device and electronic equipment, to solving to a certain extent the no-load power consumption problem of analog video signal output port, promote the low-carbon environment-friendly rate.In order to make those skilled in the art person understand better the present invention program, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, should belong to the scope of protection of the invention.
Below be elaborated respectively.
Term " first " in specification of the present invention and claims and above-mentioned accompanying drawing, " second ", " the 3rd " " 4th " etc. (if existence) are be used to distinguishing similar object, and needn't be used to describing specific order or precedence.The data that should be appreciated that such use suitably can exchanged in situation, so as embodiments of the invention described herein for example can with except diagram here or describe those order enforcement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, for example, comprised those steps or unit that process, method, system, product or the equipment of series of steps or unit are not necessarily limited to clearly list, but can comprise clearly do not list or for these processes, method, product or equipment intrinsic other step or unit.
Refer to Fig. 1, the schematic diagram of a kind of analog video signal output device that Fig. 1 provides for one embodiment of the invention, as shown in Figure 1, a kind of analog video signal output device of providing of one embodiment of the invention can comprise: video signal output circuit 160, block isolating circuit 110, biasing circuit 120, testing circuit 140 and be used to switching circuit of power supply 150, the analog video signal output port K1 of video signal output circuit 160 power supplies.
The analog video signal output device can be used for to terminal equipment, exporting analog video signal by analog video signal output port K1.
Wherein, video signal output circuit 160 is be used to exporting analog video signal.Wherein, the analog video signal of video signal output circuit 160 output, after block isolating circuit 110, biasing circuit 120, is sent to terminal equipment (wherein, terminal equipment such as TV etc.) by the mode signal output port.
Block isolating circuit 110 is for the DC component of filtering analog video signal, and wherein, block isolating circuit 110 can be before above-mentioned analog video signal arrives the analog video signal output port, the DC component in the filtering analog video signal.
Biasing circuit 120 is for the port voltage lifting by the analog video signal output port.
Wherein, biasing circuit 120 for example can comprise the first power voltage supply end, and first resistance of connecting with the first power voltage supply end and the 3rd resistance, the first resistance and the 3rd resistance series connection ground connection, analog video signal output port K1 is connected between the first resistance and the 3rd resistance.Wherein, the first power voltage supply end can provide the first supply power voltage (for example 5V).
Testing circuit 140, be coupled to the control end of video signal output circuit 160 output ports and switching circuit of power supply 150, for detection of the port voltage of analog video signal output port whether higher than default voltage threshold, wherein, at the port voltage that the analog video signal output port detected during higher than default voltage threshold, control switching circuit of power supply 150 and be in the power supply off state, at the port voltage that above-mentioned analog video signal output port detected, during lower than default voltage threshold, control switching circuit of power supply 150 and be in power supply state.
Wherein, switching circuit of power supply 150 further is coupled to video signal output circuit, be used for, when switching circuit of power supply 150 is in the power supply off state, stop video signal output circuit 160 power supplies, when switching circuit of power supply 150 is in power supply state, maintain video signal output circuit 160 power supplies.
Wherein, the analog video signal output port can be as shown in the K1 in Fig. 1, in figure, analog video signal output port K1 is expressed as to switch, the 4th resistance R 4 in Fig. 1 means equivalent load impedance, when analog video signal output port K1 disconnects, mean that analog video signal output port K1 is in Light Condition, namely the connecting line of analog video signal output port K1 is extracted; When analog video signal output port K1 is closed, mean that analog video signal output port K1 is in load condition, that is, the connecting line of analog video signal output port K1 is plugged, and has been connected as terminal equipments such as analog video signal output port K1 and television sets.
Referring to Fig. 2, in some embodiments of the invention, the analog video signal output device also can comprise:
Twitter circuit 130 disappears, wherein, the input of twitter circuit 130 of disappearing is electrically connected to above-mentioned analog video signal output port, the output of twitter circuit 130 of disappearing is connected with the input of testing circuit 140, wherein, disappear twitter circuit 130 for, eliminate the shake that plug/unplug line moment produces, also can be used for filtering and from the input of the twitter circuit 130 that disappears, enter the analog video signal of the twitter circuit 130 that disappears.The present invention is in each embodiment, and the plug/unplug line refers to the plug/unplug line of described analog video signal output port.Described analog video signal output port plug wire means the described analog video signal output device of terminal equipment (such as TV) access; Described analog video signal output port pulls out line and means that described terminal equipment and described analog video signal output device disconnect.
Referring to Fig. 3, in some embodiments of the invention, video signal output circuit 160 can comprise: D/A converting circuit 161 and drive circuit 162.
Wherein, D/A converting circuit 161, can be used for converting digital video signal to analog video signal output;
Drive circuit 162, the analog video signal that can be used for 161 outputs of logarithmic mode change-over circuit amplifies output afterwards, or the analog video signal that drive circuit 162 can be used for 161 outputs of logarithmic mode change-over circuit carries out filtering and amplifies output afterwards.
Wherein, in circuit shown in Figure 3, switching circuit of power supply 150 can be respectively D/A converting circuit 161 and drive circuit 162 power supplies in video signal output circuit 160.
Referring to Fig. 4, in some embodiments of the invention, video signal output circuit 160 can comprise:
D/A converting circuit 161 and active filter circuit 163.
Wherein, D/A converting circuit 161, can be used for converting digital video signal to analog video signal output;
Active filter circuit 163, the analog video signal that can be used for 161 outputs of logarithmic mode change-over circuit carries out exporting after filtering.
Wherein, in circuit shown in Figure 4, switching circuit of power supply 150 can be respectively D/A converting circuit 161 and active filter circuit 163 power supplies in video signal output circuit 160.
Referring to Fig. 5, in some embodiments of the invention, video signal output circuit 160 can comprise:
D/A converting circuit 161 and passive filter circuit 164.
Wherein, D/A converting circuit 161, can be used for converting digital video signal to analog video signal output;
Passive filter circuit 164, the analog video signal that can be used for 161 outputs of logarithmic mode change-over circuit carries out exporting after filtering.
Wherein, in circuit shown in Figure 5, switching circuit of power supply 150 is D/A converting circuit 161 power supplies in video signal output circuit 160, and passive filter circuit 164 is without power supply.
Can find out, the analog video signal output device that the present embodiment provides mainly comprises: video signal output circuit, block isolating circuit, biasing circuit, testing circuit and the switching circuit of power supply that is used to video signal output circuit to power; The DC component of the analog video signal that block isolating circuit is exported for the filtering video signal output circuit; Biasing circuit is used for the port voltage lifting of analog video signal output port; Testing circuit for detection of the port voltage of analog video signal output port whether higher than default voltage threshold, at the port voltage that the analog video signal output port detected during higher than default voltage threshold, control switching circuit of power supply and be in the power supply off state, and can during lower than default voltage threshold, control switching circuit of power supply and be in power supply state at the port voltage that the analog video signal output port detected.Due to inserting of analog video signal output port, the port voltage that the state of pulling out reflects is not identical, therefore by introducing block isolating circuit, biasing circuit and testing circuit etc., be conducive to timely and effective the inserting of analog video signal output port that detect, pull out state, whether and then to be conducive to control timely and effectively switching circuit of power supply be the video signal output circuit power supply, when unloaded, electric switch circuit is no longer video signal output circuit (energy consumption of video signal output circuit is relatively high) power supply, therefore, can solve to a certain extent the no-load power consumption problem of analog video signal output port, be conducive to promote the low-carbon environment-friendly rate.
For ease of better understanding and implement the scheme of the embodiment of the present invention, below by accompanying drawing some concrete circuit structures of giving an example.
Referring to Fig. 6～Figure 18, in some embodiments of the invention, block isolating circuit 110 can comprise:
The first capacitor C 1, wherein, video signal output circuit 160 outputs are by the first capacitor C 1 and the 3rd resistance R 3 ground connection, and video signal output circuit 160 outputs also are electrically connected to the first power voltage supply end VCC-1 by the first capacitor C 1 and the first resistance R 1.
Referring to Fig. 6, in some embodiments of the invention, biasing circuit 120 can comprise: the first power voltage supply end VCC-1, the first resistance R 1 and the 3rd resistance R 3; Wherein, the first power voltage supply end V Cc-1With the first resistance R 1 and the 3rd resistance R 3, connect, the first resistance R 1 and the 3rd resistance R 3 series connection ground connection, analog video signal output port K1 is connected between the first resistance R 1 and the 3rd resistance R 3.The first power voltage supply end VCC-1 input 5V voltage of take in figure is example.
The twitter circuit 130 that disappears can comprise: the first diode D1, the second capacitor C 2, the 5th resistance R 5 and the 6th resistance R 6;
Wherein, the anode of the first diode D1 is electrically connected to above-mentioned analog video signal output port,
The anode of the first diode D1 is also by the 3rd resistance R 3 ground connection, the anode of the first diode D1 also is electrically connected to the first power voltage supply end VCC-1 by the first resistance R 1, the negative electrode of the first diode D1 is by the 5th resistance R 5 ground connection, the negative electrode of the first diode D1 is also by the 6th resistance R 6 and the second capacity earth, and the negative electrode of the first diode D1 also is electrically connected to the output of above-mentioned testing circuit by the 6th resistance R 6.
Referring to Fig. 6, in some embodiments of the invention, testing circuit 140 can comprise:
The 7th resistance R 7, the 8th resistance R 8 and the second triode Q2; The second triode Q2 of the present embodiment is actually one bipolar (Bipolar) pipe.
Wherein, the grounded emitter of the second triode Q2, the base stage of the second triode Q2 is connected with the output of the above-mentioned twitter circuit that disappears by the 8th resistance R 8, the collector electrode of the second triode Q2 is electrically connected to second voltage feeder ear VCC-2 by the 7th resistance R 7, and the collector electrode of the second triode Q2 also is electrically connected to the control end of above-mentioned switching circuit of power supply.
Referring to Figure 12, in some embodiments of the invention, testing circuit 140 can comprise:
The 7th resistance R 7, the 8th resistance R 8 and the 5th triode Q5; In the present embodiment, the 5th triode Q5 is actually a MOS(metal-oxide semiconductor (MOS)) pipe.
Wherein, the source ground of the 5th triode Q5, the grid of the 5th triode Q5 is connected with the output of the above-mentioned twitter circuit that disappears by the 8th resistance R 8, the drain electrode of the 5th triode Q5 is electrically connected to second voltage feeder ear VCC-2 by the 7th resistance R 7, wherein, the drain electrode of the 5th triode Q5, as the output of testing circuit 140, also is electrically connected to the control end of switching circuit of power supply 150.
Referring to Figure 14, in some embodiments of the invention, biasing circuit 120 can comprise: the first resistance R 1 and the 3rd resistance R 3; The twitter circuit 130 that disappears can comprise: the second capacitor C 2 and the 6th resistance R 6;
Wherein, above-mentioned analog video signal output port is electrically connected to the first power voltage supply end VCC-1 by the first resistance R 1, above-mentioned analog video signal output port is also by the 3rd resistance R 3 ground connection, above-mentioned analog video signal output port is also by the 6th resistance R 6 and the second capacitor C 2 ground connection, and above-mentioned analog video signal output port also is electrically connected to the output of above-mentioned testing circuit by the 6th resistance R 6.
Referring to Figure 14, in some embodiments of the invention, testing circuit 140 can comprise:
The 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9 and operational amplifier.
Wherein, the positive input terminal of above-mentioned operational amplifier is connected with the output of the above-mentioned twitter circuit that disappears by the 8th resistance R 8, the negative input end of above-mentioned operational amplifier is by the 9th resistance R 9 ground connection, the negative input end of above-mentioned operational amplifier also is electrically connected to the first power voltage supply end VCC-1 by the 7th resistance R 7, and the output of above-mentioned operational amplifier also is electrically connected to the control end of above-mentioned switching circuit of power supply.
Referring to Fig. 7, in some embodiments of the invention, switching circuit of power supply 150 can comprise:
The first triode Q1, the 3rd triode Q3, the 9th resistance R 9, the tenth resistance R 10 and the 11 resistance R 11, the first triode Q1 are metal-oxide-semiconductor, and the 3rd triode Q3 is the Bipolar pipe.
Wherein, the grounded emitter of the 3rd triode Q3, the base stage of the 3rd triode Q3 is connected by the output of the 9th resistance R 9 and above-mentioned testing circuit, the collector electrode of the 3rd triode Q3 is electrically connected to by the tenth resistance R 10 and the first triode Q1 source electrode, the collector electrode of the 3rd triode Q3 also is electrically connected to by the grid of the 11 resistance R 11 and the first triode Q1, the source electrode of the first triode Q1 also is electrically connected to the first power voltage supply end VCC-1, wherein, the drain electrode of the first triode Q1 is as the first power supply output of above-mentioned switching circuit of power supply, for above-mentioned video signal output circuit power supply.
Referring to Fig. 8 and Figure 11, in some embodiments of the invention, switching circuit of power supply 150 can comprise:
The 3rd triode Q3, the 4th triode Q4, the 9th resistance R the 9, the 13 resistance R 13 and the 14 resistance R 14, the three triode Q3 are the Bipolar pipe, and the 4th triode Q4 is metal-oxide-semiconductor.
Wherein, the grounded emitter of the 3rd triode Q3, the base stage of the 3rd triode Q3 is connected by the output of the 9th resistance R 9 and above-mentioned testing circuit; The source electrode of the 4th triode Q4 is electrically connected to second voltage feeder ear VCC-2, the grid of the 4th triode Q4 is electrically connected to the collector electrode of the 3rd triode Q3 by the 13 resistance R 13, the source electrode of the 4th triode Q4 also is electrically connected to the collector electrode of the 3rd triode Q3 by the 14 resistance R 14, wherein, the drain electrode of the 4th triode Q4, as the second power supply output of above-mentioned switching circuit of power supply, is above-mentioned video signal output circuit power supply.
Referring to Fig. 6, Fig. 9 and Figure 10, in some embodiments of the invention, switching circuit of power supply 150 can comprise: the first triode Q1, the 3rd triode Q3, the 4th triode Q4, the 9th resistance R 9, the tenth resistance R the 10, the 11 resistance R 11 and the 13 resistance R 13, the first triode Q1 is metal-oxide-semiconductor, the 3rd triode Q3 is the Bipolar pipe, and the 4th triode Q4 is metal-oxide-semiconductor.
Wherein, the grounded emitter of the 3rd triode Q3, the base stage of the 3rd triode Q3 is connected by the output of the 9th resistance R 9 and above-mentioned testing circuit, the collector electrode of the 3rd triode Q3 is electrically connected to by the tenth resistance R 10 and the first triode Q1 source electrode, the collector electrode of the 3rd triode Q3 also is electrically connected to by the grid of the 11 resistance R 11 and the first triode Q1, the source electrode of the first triode Q1 also is electrically connected to the first power voltage supply end VCC-1, wherein, the drain electrode of the first triode Q1 is as the first power supply output of above-mentioned switching circuit of power supply, for above-mentioned video signal output circuit power supply, the source electrode of the 4th triode Q4 is electrically connected to second voltage feeder ear VCC-2, the grid of the 4th triode Q4 is electrically connected to the collector electrode of the 3rd triode Q3 by the 13 resistance R 13, wherein, the drain electrode of the 4th triode Q4, as the second power supply output of above-mentioned switching circuit of power supply, is above-mentioned video signal output circuit power supply.
Referring to Figure 12, in some embodiments of the invention, switching circuit of power supply 150 can comprise: the first triode Q1, the 6th triode Q6, the 4th triode Q4, the 9th resistance R 9, the tenth resistance R the 10, the 11 resistance R 11 and the 13 resistance R 13, the first triode Q1 and the 6th triode Q6 are metal-oxide-semiconductor.
Wherein, the source ground of the 6th triode Q6, the grid of the 6th triode Q6 is connected by the output of the 9th resistance R 9 and above-mentioned testing circuit, the drain electrode of the 6th triode Q6 is electrically connected to by the source electrode of the tenth resistance R 10 and the first triode Q1, the drain electrode of the 3rd triode Q3 also is electrically connected to by the grid of the 11 resistance R 11 and the first triode Q1, the source electrode of the first triode Q1 also is electrically connected to the first power voltage supply end VCC-1, wherein, the drain electrode of the first triode Q1 is as the first power supply output of above-mentioned switching circuit of power supply, for above-mentioned video signal output circuit power supply, wherein, the source electrode of the 4th triode Q4 is electrically connected to second voltage feeder ear VCC-2, the grid of the 4th triode Q4 is electrically connected to the drain electrode of the 6th triode Q6 by the 13 resistance R 13, wherein, the drain electrode of the 4th triode Q4, as the second power supply output of above-mentioned switching circuit of power supply, is above-mentioned video signal output circuit power supply.
In some embodiments of the invention, as a kind of of switching circuit of power supply in Figure 12, simplify, switching circuit of power supply 150 can comprise: the first triode Q1, the 6th triode Q6, the 9th resistance R 9, the tenth resistance R 10 and the 11 resistance R 11, the first triode Q1 and the 6th triode Q6 are metal-oxide-semiconductor.
Wherein, the source ground of the 6th triode Q6, the grid of the 6th triode Q6 is connected by the output of the 9th resistance R 9 and above-mentioned testing circuit, the drain electrode of the 6th triode Q6 is electrically connected to by the source electrode of the tenth resistance R 10 and the first triode Q1, the drain electrode of the 3rd triode Q3 also is electrically connected to by the grid of the 11 resistance R 11 and the first triode Q1, the source electrode of the first triode Q1 also is electrically connected to the first power voltage supply end VCC-1, wherein, the drain electrode of the first triode Q1 is as the first power supply output of above-mentioned switching circuit of power supply, for above-mentioned video signal output circuit power supply.
In some embodiments of the invention, as the another kind of switching circuit of power supply in Figure 12, to simplify, switching circuit of power supply 150 can comprise: the 6th triode Q6, the 4th triode Q4, the 9th resistance R the 9, the 13 resistance R 13 and the 14 resistance R 14.The 6th triode Q6 and the 4th triode Q4 are metal-oxide-semiconductor.
Wherein, the source ground of the 6th triode Q6, the grid of the 6th triode Q6 is connected by the output of the 9th resistance R 9 and above-mentioned testing circuit; Wherein, the source electrode of the 4th triode Q4 is electrically connected to second voltage feeder ear VCC-2, the grid of the 4th triode Q4 is electrically connected to the drain electrode of the 6th triode Q6 by the 13 resistance R 13, the source electrode of the 4th triode Q4 also is electrically connected to the drain electrode of the 6th triode Q6 by the 14 resistance R 14, wherein, the drain electrode of the 4th triode Q4, as the second power supply output of above-mentioned switching circuit of power supply, is above-mentioned video signal output circuit power supply.
Referring to Figure 13, in some embodiments of the invention, switching circuit of power supply 150 can comprise: the 7th triode Q7, the 6th triode Q6, the 8th triode Q8, the 9th resistance R 9, the tenth resistance R the 10, the 11 resistance R 11 and the 13 resistance R 13, the 7th triode Q7 and the 8th triode Q8 are the Bipolar pipe, and the 6th triode Q6 is metal-oxide-semiconductor.
Wherein, the source ground of the 6th triode Q6, the grid of the 6th triode Q6 is connected by the output of the 9th resistance R 9 and above-mentioned testing circuit, the drain electrode of the 6th triode Q6 is electrically connected to by the emitter of the tenth resistance R 10 and the 7th triode Q7, the drain electrode of the 3rd triode Q3 also is electrically connected to by the base stage of the 11 resistance R 11 and the 7th triode Q7, the emitter of the 7th triode Q7 also is electrically connected to the first power voltage supply end VCC-1, wherein, the collector electrode of the 7th triode Q7 is as the first power supply output of above-mentioned switching circuit of power supply, for above-mentioned video signal output circuit power supply, the emitter of the 8th triode Q8 is electrically connected to second voltage feeder ear VCC-2, the base stage of the 8th triode Q8 is electrically connected to the drain electrode of the 6th triode Q6 by the 13 resistance R 13, wherein, the collector electrode of the 8th triode Q8, as the second power supply output of above-mentioned switching circuit of power supply, is above-mentioned video signal output circuit power supply.
In some embodiments of the invention, as a kind of of switching circuit of power supply in Figure 13, simplify, switching circuit of power supply 150 can comprise: the 7th triode Q7, the 6th triode Q6, the 9th resistance R 9, the tenth resistance R 10 and the 11 resistance R 11, the 7th triode Q7 is the Bipolar pipe, and the 6th triode Q6 is metal-oxide-semiconductor.
Wherein, the source ground of the 6th triode Q6, the grid of the 6th triode Q6 is connected by the output of the 9th resistance R 9 and above-mentioned testing circuit, the drain electrode of the 6th triode Q6 is electrically connected to by the emitter of the tenth resistance R 10 and the 7th triode Q7, the drain electrode of the 3rd triode Q3 also is electrically connected to by the base stage of the 11 resistance R 11 and the 7th triode Q7, the emitter of the 7th triode Q7 also is electrically connected to the first power voltage supply end VCC-1, wherein, the collector electrode of the 7th triode Q7 is as the first power supply output of above-mentioned switching circuit of power supply, for above-mentioned video signal output circuit power supply.
In some embodiments of the invention, another kind as switching circuit of power supply in Figure 13 is simplified, switching circuit of power supply 150 can comprise: the 6th triode Q6, the 8th triode Q8, the 9th resistance R the 9, the 13 resistance R 13 and the 14 resistance R 14, the 6th triode Q6 is metal-oxide-semiconductor, and the 8th triode Q8 is the Bipolar pipe.
Wherein, the source ground of the 6th triode Q6, the grid of the 6th triode Q6 is connected by the output of the 9th resistance R 9 and above-mentioned testing circuit; The emitter of the 8th triode Q8 is electrically connected to second voltage feeder ear VCC-2, the base stage of the 8th triode Q8 is electrically connected to the drain electrode of the 6th triode Q6 by the 13 resistance R 13, the emitter of the 8th triode Q8 also is electrically connected to the drain electrode of the 6th triode Q6 by the 14 resistance R 14, wherein, the collector electrode of the 8th triode Q8, as the second power supply output of above-mentioned switching circuit of power supply, is above-mentioned video signal output circuit power supply.
Referring to Figure 14, in some embodiments of the invention, switching circuit of power supply 150 can comprise:
The 4th triode Q4, the 13 resistance R 13, the first triode Q1, the tenth resistance R 10 and the 11 resistance R 11, the first triode Q1 and the 4th triode Q4 are metal-oxide-semiconductor.
Wherein, the source electrode of the first triode Q1 is connected with the output of above-mentioned testing circuit by the tenth resistance R 10, the source electrode of the first triode Q1 also is electrically connected to the first power voltage supply end VCC-1, the grid of the first triode Q1 is connected with the output of above-mentioned testing circuit by the 11 resistance R 11, wherein, the drain electrode of the first triode Q1, as the first power supply output of above-mentioned switching circuit of power supply, is above-mentioned video signal output circuit power supply; The grid of the 4th triode Q4 is connected with the output of above-mentioned testing circuit by the 13 resistance R 13; The source electrode of the 4th triode Q4 also is electrically connected to second voltage feeder ear VCC-2; Wherein, the drain electrode of the 4th triode Q4, as the second power supply output of above-mentioned switching circuit of power supply, is above-mentioned video signal output circuit power supply.
Referring to Figure 15 and 17, in some embodiments of the invention, switching circuit of power supply 150 can comprise:
The first triode Q1, the tenth resistance R 10 and the 11 resistance R 11, the first triode Q1 are metal-oxide-semiconductor.
Wherein, the source electrode of the first triode Q1 is connected with the output of above-mentioned testing circuit by the tenth resistance R 10, the source electrode of the first triode Q1 also is electrically connected to the first power voltage supply end VCC-1, the grid of the first triode Q1 is connected with the output of above-mentioned testing circuit by the 11 resistance R 11, wherein, the drain electrode of the first triode Q1, as the first power supply output of above-mentioned switching circuit of power supply, is above-mentioned video signal output circuit power supply.
Referring to Figure 16 and 18, in some embodiments of the invention, switching circuit of power supply 150 can comprise:
The 4th triode Q4, the 13 resistance R 13 and the 14 resistance R 14, the four triode Q4 are metal-oxide-semiconductor.
Wherein, the grid of the 4th triode Q4 is connected with the output of above-mentioned testing circuit by the 13 resistance R 13; The source electrode of the 4th triode Q4 is connected with the output of above-mentioned testing circuit by the 14 resistance R 14, and the source electrode of the 4th triode Q4 also is electrically connected to second voltage feeder ear VCC-2; Wherein, the drain electrode of the 4th triode Q4, as the second power supply output of above-mentioned switching circuit of power supply, is above-mentioned video signal output circuit power supply.
Wherein, the voltage that the first power voltage supply end VCC-1 and second voltage feeder ear VCC-2 provide can equate or is unequal, in figure, provide 5V voltage with the first power voltage supply end VCC-1, it is example that second voltage feeder ear VCC-2 provides 3.3V voltage, certainly also can adjust as required in actual applications the voltage swing that the first power voltage supply end VCC-1 and/or second voltage feeder ear VCC-2 provide.
In some embodiments of the invention, each resistance (such as the first resistance, the 3rd resistance, the 4th resistance etc.) in the particular circuit configurations of Fig. 6～shown in Figure 180 all can be selected the resistance that resistance is larger, for example can select the resistance of the above resistance of 10K, to reduce the impact on analog video signal.
Be understandable that, Fig. 6～particular circuit configurations shown in Figure 180 also can be out of shape and/or replace the circuit that components and parts obtain having identical or similar functions by circuit in actual applications only for for example, be repeated no longer for example herein.
Below simply introduce the operation principle of Fig. 6～structural circuit shown in Figure 180.
Block isolating circuit 110 is by the DC component filtering of video signal output circuit output, and the effective video signal is substantially unaffected.After block isolating circuit 110, increase a biasing circuit 120 port voltage is carried out to lifting.The vision signal that the twitter circuit 130 that disappears enters be used to eliminating shake that plug wire/pull out line moment produces and filtering the twitter circuit 130 that disappears, to avoid the testing circuit misoperation.The output of twitter circuit 130 of disappearing is connected to testing circuit 140, testing circuit carries out corresponding judgement, if applied signal voltage means to insert (zero load) without connecting line higher than default voltage threshold, now, control switching circuit of power supply 150 and be in the power supply off state, video signal output circuit 160 is in off-position; If applied signal voltage means to have connecting line to insert lower than default voltage threshold, now control switching circuit of power supply 150 and be in power supply state, video signal output circuit 160 is in power-up state, so video signal output circuit 160 can normally be exported analog video signal.
Particularly, can be divided into the course of work that 4 kinds of situations are described foregoing circuit:
When port is unloaded, port voltage produces a direct voltage higher than the default voltage threshold Vs of testing circuit under the effect of biasing circuit 120, this direct voltage is through outputing in testing circuit 140 after the twitter circuit 130 that disappears, testing circuit 140 detects input voltage higher than default voltage threshold Vs, output low level is in the power supply off state to control switching circuit of power supply 150, not to video signal output circuit 160 power supplies, so video signal output circuit 160 is in off-position.
When port inserts connecting line moment, suppose that the vision signal load end is 75 Europe impedances, and that the resistance of biasing circuit 120 is compared load end 75 Europe is very large, therefore, port voltage moment is dragged down when the port connecting line connects.Now, video signal output circuit 160 is in off-position, port is without the output of video signal, and therefore, port voltage is close to 0V, this port voltage is through input detecting circuit 140 after the twitter circuit 130 that disappears, port voltage is lower than default voltage threshold Vs, and therefore, the output high level is in power supply state to control switching circuit of power supply 150, to video signal output circuit 160 power supplies, so video signal output circuit 160 is in the state of working on power.
When video signal output circuit 160 normal operation, the hypothetical simulation vision signal is output 1Vp-p when band carries, and this signal superposes at the direct current biasing of port and biasing circuit generation.Signal after stack Maximum Forward Voltage over the ground is not more than 1V, lower than default voltage threshold Vs.This voltage is through input detecting circuit 140 after the twitter circuit 130 that disappears, this voltage is lower than default voltage threshold Vs, therefore, testing circuit 140 output high level are in power supply state to control switching circuit of power supply 150, switching circuit of power supply 150 is to video signal output circuit 160 power supplies, therefore video signal output circuit 160 is in the state of working on power, and normally exports analog video signal.
When connecting line is extracted port moment, biasing circuit 120 produces, and direct current biasing uprises the port level, now vision signal still normally export 2Vp-p and and the port DC offset voltage superpose.The signal of stack after direct current biasing over the ground minimum forward voltage higher than default voltage threshold Vs.Direct voltage is through outputing to testing circuit 140 after the twitter circuit 130 that disappears, testing circuit 140 detects input voltage higher than default voltage threshold Vs, output low level is in the power supply off state to control switching circuit of power supply 150, not to video signal output circuit 160 power supplies, therefore, video signal output circuit 160 is de-energized.
Briefly, when port is non-loaded while also without the video signal, exporting (Light Condition), port voltage is higher than default voltage threshold Vs; Non-loaded but vision signal when output (pull out line moment) arranged when port, port voltage is direct voltage stack 2Vp-p vision signal, still higher than default voltage threshold Vs; Wherein, when port has load to export without the video signal (plug wire moment), port voltage due to the existence of 75 Europe loads near 0V, therefore lower than default voltage threshold Vs; When port has load that vision signal output is arranged (band carries state), port voltage is the vision signal of 1Vp-p, still lower than default voltage threshold Vs.
The circuit shown in Figure 9 of below take is simply introduced as example.
K1 disconnects when port is in Light Condition, now under the effect of the first resistance R 1, the 3rd resistance R 3, the first diode D1, the 5th resistance R 5, the first resistance R 6, the 8th resistance R 8 and the second triode Q2, the port bias voltage is that (establishing port voltage is V in the 4V left and right x, can be by solving an equation V 1 - V x R 1 - V x R 3 = V x - 0.7 R 5 + V x - 1.4 R 6 + R 8 Draw).
Now, the first diode D1 conducting, the base current of the second triode Q2 can be expressed as The maximum current I of the collector electrode of the second triode Q2 C_Q2=3.3/R7=165uA.Select common NPN triode all can meet current amplification factor β>=40 as the second triode Q2, therefore 40 * I B_Q2=2200uA>I C_Q2=165uA, Q2 saturation conduction, Q2 collector voltage are 0V; The 3rd triode Q3 cut-off, the collector voltage of the 3rd triode Q3 is 5V, the first triode Q1, the 4th triode Q4 all end, therefore, D/A converting circuit and drive circuit are in electricity under power down() state.
When port is in, pull out line moment, K1 disconnects, and now on port, voltage is 2Vp-p vision signal stack 4V direct current biasing, thereby minimum voltage is not less than 2V.The minimum voltage of exporting after the first diode D1 dividing potential drop is 1.3V, and the second triode Q2 base current is
Figure BDA00003586269000203
Still can meet 40 * I B_Q2=508uA>I C_Q2=165uA, the second triode Q2 is saturation conduction still, and the second triode Q2 collector voltage is 0V; The 3rd triode Q3 cut-off, and the first triode Q1 and the 4th triode Q4 all end, D/A converting circuit and drive circuit proceed to power down by operating state.Therefore vision signal no-output, port voltage reverts to again 4V, and the second triode Q2 keeps the saturation conduction state, thereby the first triode Q1 and the 4th triode Q4 are in stable cut-off state.
When being in band, port carries state, K1 closure.Now due to the existence of TV end 75 Europe loads, the DC offset voltage of port is near 0V.Video amplitude is 1Vp-p, therefore, on port over the ground Maximum Forward Voltage not higher than 1V.The ceiling voltage of exporting after the first diode D1 dividing potential drop is 0.3V, and this voltage makes the second triode Q2 cut-off lower than the conducting voltage of the second triode Q2; The 3rd triode Q3 due to base voltage higher than 0.7V, and the large and saturation conduction of base current.The voltage of the 3rd triode Q3 collector electrode is 0V, the first triode Q1 and the 4th triode Q4 conducting, and D/A converting circuit and drive circuit are by normal power supply.
When port is in plug wire moment, K1 closure.Existence due to TV set terminal 75 Europe loads, the DC offset voltage of port is near 0V, and the first diode D1, the second triode Q2 all end, the 3rd triode Q3 saturation conduction, the first triode Q1 and the 4th triode Q4 conducting, D/A converting circuit and drive circuit are by normal power supply.
In the various embodiments of the present invention circuit, by the adjustment related device, can make the port direct current biasing is 4V, simultaneously by the first diode D1 in the twitter circuit that disappears, the 6th resistance R 6, and the 8th resistance R 8, the second triode Q2 in testing circuit 140 to make whole testing circuit work high-level threshold be that 1.6V(makes the second triode Q2 work in the condition of saturation conduction), the low level threshold value is the condition that 1.4V(makes the second triode Q2 cut-off).When port be in zero load or pull out line during moment the port minimum voltage higher than 2.0V(higher than default voltage threshold Vs), testing circuit 140 output low levels, close the power supply of D/A converting circuit and drive circuit to control switching circuit of power supply 150; When port be in that band carries or plug wire during moment the port ceiling voltage not higher than 1.0V(lower than default voltage threshold Vs), testing circuit output high level, the power supply of opening D/A converting circuits and drive circuit to control switching circuit of power supply 150.If the resistance of the first resistance R 1, the 3rd resistance R 3, the 5th resistance R 5, the 6th resistance R 6 all is greater than 10K, can think that the video amplitude of port is influenced hardly.In some embodiments of the invention, the resistance in Fig. 6～circuit shown in Figure 180 is all optional with TV university resistance resistance, and the circuit oneself power consumption is minimum and can ignore.
The 6th resistance R 6 and the second capacitor C 2 that disappear in twitter circuit 130 form 1 rank R-C low-pass filter circuits, the effectively level shake and the spike interference that produce of filtering port plug/unplug line moment, the vision signal that again can filtering enters testing circuit 140.In actual use, can strengthen or reduce according to the actual conditions of level shake and spike the appearance value of the second capacitor C 2.
Series diode in twitter circuit 130 disappears, be conducive to testing circuit work high level decision threshold is brought up to 1.6V, the low level decision threshold is brought up to 1.4V, guarantee to be the high level input higher than the correctly detected circuit judgement of 2V voltage, lower than 1.4V voltage, correctly be judged as low level input, and then the misoperation that can avoid triode to cause due to the temperature factor such as waft.
The circuit shown in Figure 17 of below take is simply introduced as example.Wherein, be with the main distinction of circuit shown in Figure 9, in circuit shown in Figure 17, use the testing circuit built based on operational amplifier U1 to substitute the testing circuit built based on triode in Fig. 9.
Due to operational amplifier U1 input, can regard as and open circuit, the 6th resistance R 6, the 8th resistance R 8 can not produce partial pressure effects, and therefore, the DC offset voltage of port the first resistance R 1 and 3 pairs of 5V dividing potential drops of the 3rd resistance R in biasing circuit obtain:
Figure BDA00003586269000211
And the positive input voltage of operational amplifier U1 equals port voltage.
The operational amplifier U1 of 1 single 5V power supply of testing circuit 140 use builds, the detection signal that the twitter circuit 130 that disappears is exported is connected to the positive input of operational amplifier U1 by the 8th resistance R 8, the negative input of operational amplifier U1, by the 7th resistance R 7 and 9 pairs of 5V dividing potential drops of the 9th resistance R, obtains the detection threshold voltage (default voltage threshold Vs) of a 1.5v.Testing circuit 40 courses of work are: when input signal during higher than default voltage threshold 1.5V, and operational amplifier U1 output 5V high level; When input signal during lower than default voltage threshold 1.5V, operational amplifier U1 output 0V low level.The high-low level of testing circuit 140 outputs is directly controlled switching circuit of power supply 150 and is carried out power on/off operation.
The specific works process is as follows:
When port is in Light Condition, K1 disconnects, and now port voltage equals bias voltage 4V and higher than default voltage threshold, operational amplifier U1 output 5V all ends the first triode Q1 and the 4th triode Q4, therefore, D/A converting circuit and drive circuit are in power down state.
When port is in, pull out line moment, K1 disconnects.Now on port, voltage is 2Vp-p vision signal stack 4V direct current biasing, minimum voltage is higher than default voltage threshold 1.5V, operational amplifier U1 output 5V all ends the first triode Q1 and the 4th triode Q4, and D/A converting circuit and drive circuit proceed to power down by operating state.Analog video signal no-output, port voltage revert to again 4V, and operational amplifier U1 keeps output 5V constant, and therefore, the first triode Q1 and the 4th triode Q4 are in stable cut-off state.
When being in band, port carries state, K1 closure.Now the DC offset voltage of port is near 0V, the analog video signal amplitude is 1Vp-p, therefore, on port over the ground Maximum Forward Voltage lower than default voltage threshold 1.5V, operational amplifier U1 output 0V makes the first triode Q1 and the 4th triode Q4 conducting, D/A converting circuit and drive circuit are by normal power supply, and analog video signal is normally exported.
When port is in plug wire moment, K1 closure.Now the voltage of port near 0V(lower than default voltage threshold 1.5V), operational amplifier U1 exports 0V, makes the first triode Q1 and the 4th triode Q4 conducting, therefore, D/A converting circuit and drive circuit are powered normally, and analog video signal can normally be exported.
In some embodiments of the invention, biasing circuit carries out the dividing potential drop generation by the above resistance of 10K to the 5V power supply, be conducive to guarantee carry and export 1Vp-p vision signal situation lower port voltage all the time lower than detection threshold at the port band, reduce simultaneously the amplitude impact on analog video signal.
Shown in Figure 14～18, in circuit, used the amplifier of a single 5V power supply, this amplifier can be selected ordinary audio amplifier (for example 4558 audio frequency amplifiers), thereby cost is lower; With single 5V, supply the about 20mW of electrical power consumed left and right to amplifier, than the power consumption of the D/A converting circuit of saving and drive circuit, the power consumption that this part increases can be ignored.
Can find out, the cost of Fig. 6～circuit shown in Figure 180 is lower, because the price of components and parts used is all relatively cheap, implementation complexity is low, and the devices at full hardware scheme participates in without software, and circuit structure is simple, is easy to single plate hardware and realizes; Can support hot plug and two display application scenes, because the port working state depends on whether plug wire/pull out line of port fully, therefore can support hot plug, and YPBPR and HDMI(HDMI (High Definition Multimedia Interface)) the interface scene of working simultaneously.
Below the energy-saving effect of Fig. 6～circuit shown in Figure 180 carried out to data analysis.
When unloaded by port, control video signal output circuit and carry out power down, thus the power loss that can save unloaded video port on the equipment such as Set Top Box.Take 1 possess simultaneously 1 road CVBS, 1 road S-video, 1 road YPBPR(color difference components interface) Set Top Box of interface is example, the power consumption of 6 road video DAC is 3.3*0.034*6=0.6732w, the power consumption of No. 6 drive circuits is 5* (0.019+0.034)=0.265w, DAC and drive circuit power consumption sum are 0.9382w, and conversion is about 1.25w to Overall Power Consumption.If now the user only need be connected to television set by CVBS, S-video, YPBPR interface all are in Light Condition, and now no-load power consumption is 3.3*0.034*5+5* (0.019*0.67+0.034)=0.794w, and conversion is about 1.059w to Overall Power Consumption.Use Fig. 6～Figure 18 circuit can save power consumption 1.059w, for the Set Top Box of an about 5w of Overall Power Consumption, can save power consumption and reach 21%.And, by saving unloaded port power consumption, reduce equipment complete machine work power consumption, thereby reduced the heating of equipment, reduced the impact on environment, be conducive to improve service life of equipment.
Referring to Figure 19, the embodiment of the present invention also provides a kind of electronic equipment 200, can comprise:
Master chip 2010, the analog video signal output device 2020 be connected with master chip.Wherein, analog video signal output device 2020 can be as the analog video signal output device of above-mentioned embodiment description, and the structure of analog video signal output device 2020 can be as shown in Fig. 1～Figure 18 Subgraph.Master chip 2010 is be used to generating analog video signal.Master chip 2010 can be the signal by wired or wireless reception to be carried out to the chip of Digital Signal Processing, thus the result of obtaining.Described analog video signal output device 2020 is be used to receiving described Digital Signal Processing result, video signal output circuit 160 wherein is for being analog video signal by the Digital Signal Processing results conversion, and namely this video signal output circuit 160 is with the DAC(digital analog converter) function.
Alternatively, in another kind of implementation, the analog video signal output device can be integrated on chip piece with digital signal processing circuit.
Electronic equipment 200 can be Set Top Box, video monitor or the miscellaneous equipment with analog video signal output port.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can be referring to the associated description of other embodiment.
In several embodiment that the application provides, should be understood that disclosed device can be realized by another way.For example, device embodiment described above is only schematic, the for example division of described unit, be only that a kind of logic function is divided, during actual the realization, other dividing mode can be arranged, for example a plurality of unit or assembly can in conjunction with or can be integrated into another system, or some features can be ignored or not carry out.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, indirect coupling or the communication connection of device or unit can be electrical or other form.
Described unit as separating component explanation can or can not be also physically to separate, and the parts that show as unit can be or can not be also physical locations, namely can be positioned at a place, or also can be distributed on a plurality of network element.Can select according to the actual needs wherein some or all of unit to realize the purpose of the present embodiment scheme.
In addition, during each functional unit in each embodiment of the present invention can be integrated in a processing unit, can be also that the independent physics of unit exists, also can be integrated in a unit two or more unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, also can adopt the form of SFU software functional unit to realize.
The above, above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, or part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (10)

1. an analog video signal output device, for by the analog video signal output port, exporting analog video signal to terminal equipment, is characterized in that, comprising:
Video signal output circuit, block isolating circuit, biasing circuit, testing circuit and the switching circuit of power supply that is used to described video signal output circuit to power;
Wherein, described video signal output circuit is for exporting analog video signal via described block isolating circuit and biasing circuit to described analog video signal output port;
Described block isolating circuit is for the DC component of the described analog video signal of filtering before arriving described analog video signal output port at described analog video signal;
Described biasing circuit is used for the port voltage lifting of analog video signal output port, wherein, described biasing circuit comprises the first power voltage supply end, and the first resistance and the 3rd resistance of with described the first power voltage supply end, connecting, and described the 3rd grounding through resistance, described analog video signal output port are connected between described the first resistance and the 3rd resistance;
Described testing circuit is coupled to the control end of described analog video signal output port and described switching circuit of power supply, for detection of the port voltage of described analog video signal output port whether higher than default voltage threshold, at the port voltage that described analog video signal output port detected during higher than default voltage threshold, control described switching circuit of power supply and be in the power supply off state, at the port voltage that described analog video signal output port detected, during lower than described default voltage threshold, control described switching circuit of power supply and be in power supply state;
Described switching circuit of power supply further is coupled to video signal output circuit, be used for: when described switching circuit of power supply is in the power supply off state, stop described video signal output circuit power supply, when described switching circuit of power supply is in power supply state, maintain described video signal output circuit power supply.
2. hot plug testing circuit according to claim 1, it is characterized in that, described hot plug testing circuit also comprises: twitter circuit disappears, wherein, the input of the described twitter circuit that disappears is electrically connected to described analog video signal output port, and the output of the described twitter circuit that disappears is connected with the input of described testing circuit, described disappear twitter circuit for, eliminate the shake of plug line moment generation, and filtering enters the analog video signal of the described twitter circuit that disappears from the input of the described twitter circuit that disappears.
3. hot plug testing circuit according to claim 2, is characterized in that, the described twitter circuit that disappears comprises the first diode, the second electric capacity, the 5th resistance and the 6th resistance;
Wherein, the anode of described the first diode is electrically connected to described analog video signal output port,
The negative electrode of described the first diode is by described the 5th grounding through resistance, the negative electrode of described the first diode is also by described the 6th resistance and described the second capacity earth, and the negative electrode of described the first diode also is electrically connected to the output of described testing circuit by described the 6th resistance.
4. hot plug testing circuit according to claim 3, is characterized in that,
Described testing circuit comprises: the 7th resistance, the 8th resistance and the second triode;
Wherein, the grounded emitter of described the second triode, the base stage of described the second triode is connected with the output of the described twitter circuit that disappears by described the 8th resistance, the collector electrode of described the second triode is electrically connected to the second voltage feeder ear by described the 7th resistance, and the collector electrode of described the second triode also is electrically connected to the control end of described switching circuit of power supply.
5. hot plug testing circuit according to claim 3, is characterized in that,
Described testing circuit comprises: the 7th resistance, the 8th resistance and the 5th triode;
Wherein, the source ground of described the 5th triode, the grid of described the 5th triode is connected with the output of the described twitter circuit that disappears by described the 8th resistance, the drain electrode of described the 5th triode is electrically connected to the second voltage feeder ear by described the 7th resistance, wherein, the drain electrode of described the 5th triode, as the output of described testing circuit, also is electrically connected to the control end of described switching circuit of power supply.
6. according to the described hot plug testing circuit of claim 4 or 5, it is characterized in that,
Described switching circuit of power supply comprises:
The first triode, the 3rd triode, the 9th resistance, the tenth resistance and the 11 resistance,
Wherein, the grounded emitter of described the 3rd triode, the base stage of described the 3rd triode is connected by the output of described the 9th resistance and described testing circuit, the collector electrode of described the 3rd triode is electrically connected to by described the tenth resistance and described the first triode source electrode, the collector electrode of described the 3rd triode also is electrically connected to by the grid of described the 11 resistance and described the first triode, the source electrode of described the first triode also is electrically connected to the first power voltage supply end, wherein, the drain electrode of described the first triode is as the first power supply output of described switching circuit of power supply, for described video signal output circuit power supply,
Perhaps,
Described switching circuit of power supply comprises:
The 3rd triode, the 4th triode, the 9th resistance, the 13 resistance and the 14 resistance,
Wherein, the grounded emitter of described the 3rd triode, the base stage of described the 3rd triode is connected by the output of described the 9th resistance and described testing circuit; The source electrode of described the 4th triode is electrically connected to the second voltage feeder ear, the grid of described the 4th triode is electrically connected to the collector electrode of described the 3rd triode by described the 13 resistance, the source electrode of described the 4th triode also is electrically connected to the collector electrode of described the 3rd triode by the 14 resistance, wherein, the drain electrode of described the 4th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply;
Perhaps,
Described switching circuit of power supply comprises:
The first triode, the 3rd triode, the 4th triode, the 9th resistance, the tenth resistance, the 11 resistance and the 13 resistance,
Wherein, the grounded emitter of described the 3rd triode, the base stage of described the 3rd triode is connected by the output of described the 9th resistance and described testing circuit, the collector electrode of described the 3rd triode is electrically connected to by described the tenth resistance and described the first triode source electrode, the collector electrode of described the 3rd triode also is electrically connected to by the grid of described the 11 resistance and described the first triode, the source electrode of described the first triode also is electrically connected to the first power voltage supply end, wherein, the drain electrode of described the first triode is as the first power supply output of described switching circuit of power supply, for described video signal output circuit power supply, the source electrode of described the 4th triode is electrically connected to the second voltage feeder ear, the grid of described the 4th triode is electrically connected to the collector electrode of described the 3rd triode by described the 13 resistance, wherein, the drain electrode of described the 4th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply,
Perhaps,
Described switching circuit of power supply comprises:
The first triode, the 6th triode, the 9th resistance, the tenth resistance and the 11 resistance,
Wherein, the source ground of described the 6th triode, the grid of described the 6th triode is connected by the output of described the 9th resistance and described testing circuit, the drain electrode of described the 6th triode is electrically connected to by the source electrode of described the tenth resistance and described the first triode, the drain electrode of described the 3rd triode also is electrically connected to by the grid of described the 11 resistance and described the first triode, the source electrode of described the first triode also is electrically connected to the first power voltage supply end, wherein, the drain electrode of described the first triode is as the first power supply output of described switching circuit of power supply, for described video signal output circuit power supply,
Perhaps,
Described switching circuit of power supply comprises:
The 6th triode, the 4th triode, the 9th resistance, the 13 resistance and the 14 resistance;
Wherein, the source ground of described the 6th triode, the grid of described the 6th triode is connected by the output of described the 9th resistance and described testing circuit; The source electrode of described the 4th triode is electrically connected to the second voltage feeder ear, the grid of described the 4th triode is electrically connected to the drain electrode of described the 6th triode by described the 13 resistance, the source electrode of described the 4th triode also is electrically connected to the drain electrode of described the 6th triode by described the 14 resistance, wherein, the drain electrode of described the 4th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply;
Perhaps,
Described switching circuit of power supply comprises:
The first triode, the 6th triode, the 4th triode, the 9th resistance, the tenth resistance, the 11 resistance and the 13 resistance,
Wherein, the source ground of described the 6th triode, the grid of described the 6th triode is connected by the output of described the 9th resistance and described testing circuit, the drain electrode of described the 6th triode is electrically connected to by the source electrode of described the tenth resistance and described the first triode, the drain electrode of described the 3rd triode also is electrically connected to by the grid of described the 11 resistance and described the first triode, the source electrode of described the first triode also is electrically connected to the first power voltage supply end, wherein, the drain electrode of described the first triode is as the first power supply output of described switching circuit of power supply, for described video signal output circuit power supply, wherein, the source electrode of described the 4th triode is electrically connected to the second voltage feeder ear, the grid of described the 4th triode is electrically connected to the drain electrode of described the 6th triode by described the 13 resistance, wherein, the drain electrode of described the 4th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply,
Perhaps,
Described switching circuit of power supply comprises:
The 7th triode, the 6th triode, the 9th resistance, the tenth resistance and the 11 resistance,
Wherein, the source ground of described the 6th triode, the grid of described the 6th triode is connected by the output of described the 9th resistance and described testing circuit, the drain electrode of described the 6th triode is electrically connected to by the emitter of described the tenth resistance and described the 7th triode, the drain electrode of described the 3rd triode also is electrically connected to by the base stage of described the 11 resistance and described the 7th triode, the emitter of described the 7th triode also is electrically connected to the first power voltage supply end, wherein, the collector electrode of described the 7th triode is as the first power supply output of described switching circuit of power supply, for described video signal output circuit power supply,
Perhaps,
Described switching circuit of power supply comprises:
The 6th triode, the 8th triode, the 9th resistance, the 13 resistance and the 14 resistance,
Wherein, the source ground of described the 6th triode, the grid of described the 6th triode is connected by the output of described the 9th resistance and described testing circuit; The emitter of described the 8th triode is electrically connected to the second voltage feeder ear, the base stage of described the 8th triode is electrically connected to the drain electrode of described the 6th triode by described the 13 resistance, the emitter of described the 8th triode also is electrically connected to the drain electrode of described the 6th triode by the 14 resistance, wherein, the collector electrode of described the 8th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply;
Perhaps,
Described switching circuit of power supply comprises:
The 7th triode, the 6th triode, the 8th triode, the 9th resistance, the tenth resistance, the 11 resistance and the 13 resistance,
Wherein, the source ground of described the 6th triode, the grid of described the 6th triode is connected by the output of described the 9th resistance and described testing circuit, the drain electrode of described the 6th triode is electrically connected to by the emitter of described the tenth resistance and described the 7th triode, the drain electrode of described the 3rd triode also is electrically connected to by the base stage of described the 11 resistance and described the 7th triode, the emitter of described the 7th triode also is electrically connected to the first power voltage supply end, wherein, the collector electrode of described the 7th triode is as the first power supply output of described switching circuit of power supply, for described video signal output circuit power supply, the emitter of described the 8th triode is electrically connected to the second voltage feeder ear, the base stage of described the 8th triode is electrically connected to the drain electrode of described the 6th triode by described the 13 resistance, wherein, the collector electrode of described the 8th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply.
7. hot plug testing circuit according to claim 2, is characterized in that,
The described twitter circuit that disappears comprises: the second electric capacity and the 6th resistance;
Described analog video signal output port is also by described the 6th resistance and described the second capacity earth, and described analog video signal output port also is electrically connected to the output of described testing circuit by described the 6th resistance.
8. hot plug testing circuit according to claim 7, is characterized in that,
Described testing circuit comprises: the 7th resistance, the 8th resistance, the 9th resistance and operational amplifier;
Wherein, the positive input terminal of described operational amplifier is connected with the output of the described twitter circuit that disappears by described the 8th resistance, the negative input end of described operational amplifier is by described the 9th grounding through resistance, the negative input end of described operational amplifier also is electrically connected to the first power voltage supply end by described the 7th resistance, and the output of described operational amplifier also is electrically connected to the control end of described switching circuit of power supply.
9. hot plug testing circuit according to claim 8, is characterized in that,
Described switching circuit of power supply comprises:
The first triode, the tenth resistance and the 11 resistance,
Wherein, the source electrode of described the first triode is connected with the output of described testing circuit by described the tenth resistance, the source electrode of described the first triode also is electrically connected to the first power voltage supply end, the grid of described the first triode is connected with the output of described testing circuit by described the 11 resistance, wherein, the drain electrode of described the first triode, as the first power supply output of described switching circuit of power supply, is described video signal output circuit power supply;
Perhaps,
Described switching circuit of power supply comprises:
The 4th triode, the 13 resistance and the 14 resistance,
Wherein, the grid of described the 4th triode is connected with the output of described testing circuit by described the 13 resistance; The source electrode of described the 4th triode is connected with the output of described testing circuit by described the 14 resistance, and the source electrode of described the 4th triode also is electrically connected to the second voltage feeder ear; Wherein, the drain electrode of described the 4th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply;
Perhaps,
Described switching circuit of power supply comprises:
The 4th triode, the 13 resistance, the first triode, the tenth resistance and the 11 resistance,
Wherein, the source electrode of described the first triode is connected with the output of described testing circuit by described the tenth resistance, the source electrode of described the first triode also is electrically connected to the first power voltage supply end, the grid of described the first triode is connected with the output of described testing circuit by described the 11 resistance, wherein, the drain electrode of described the first triode, as the first power supply output of described switching circuit of power supply, is described video signal output circuit power supply; The grid of described the 4th triode is connected with the output of described testing circuit by described the 13 resistance; The source electrode of described the 4th triode also is electrically connected to the second voltage feeder ear; Wherein, the drain electrode of described the 4th triode, as the second power supply output of described switching circuit of power supply, is described video signal output circuit power supply.
10. an electronic equipment, is characterized in that, comprising:
Master chip, the analog video signal output device as described as claim 1～9 any one be connected with described master chip;
Described master chip is for generating described analog video signal.
CN201310323203.XA 2013-07-29 2013-07-29 Analog video signal output device and electronic equipment Active CN103414933B (en)

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CN103716509A (en) * 2013-12-20 2014-04-09 乐视致新电子科技（天津）有限公司 Correcting circuit, television and correcting method of transition minimized differential signaling
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