CN101184189B - Video switch circuit - Google Patents
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- CN101184189B CN101184189B CN2007101861351A CN200710186135A CN101184189B CN 101184189 B CN101184189 B CN 101184189B CN 2007101861351 A CN2007101861351 A CN 2007101861351A CN 200710186135 A CN200710186135 A CN 200710186135A CN 101184189 B CN101184189 B CN 101184189B
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Abstract
The invention provides a video switching circuit, comprising a control module and three switch modules (K1), (K2) and (K3); wherein, the input of the (K1) is connected with the output of the Y/G signal of the DVD decoder chip; two ports of the output are respectively connected with the Y input of the chromatic aberration variable port of the television and the S_G input of the SCART port of the television; the input of the (K2) is connected with the output of the U/B signal of the DVD decoder chip; two ports of the output are respectively connected with the U input of the chromatic aberrationvariable port of the television and the S_B input of the SCART port of the television; the input of the (K3) is connected with the output of the V/R signal of the DVD decoder chip, and two ports of the output are respectively connected with the V input of the chromatic aberration variable port of the television and the S_R input of the SCART port of the television; the control module is respectively connected with the control ports of the (K1), (K2) and (K3) to receive the SCART_CON signal, and the SCART_CON signal controls the (K1), (K2) and (K3) to choose the chromatic aberration variable port or the SCART port communicated with the television.
Description
Technical field
The invention belongs to the video technique field, relate in particular to the technology of video switch.
Background technology
In the DVD industry, some authentication (for example DVD Macrovision authentication) requires: when DVD player (also comprising DVD burner) has rgb signal (SCART port simultaneously, during the eurovision audio-video interface) with the output of YUV signal (color difference components port) video, rgb signal can not be from the output of color difference components port, and YUV signal can not be exported from the SCART port.
But because the YUV/RGB signal of all DVD decoding schemes all is shared one group of video digital-to-analogue conversion, promptly rgb signal can be from the output of color difference components port, and YUV signal also can be exported from the SCART port.
See also Fig. 1, be the existing module map that possesses the DVD of video switch controlled function.This scheme is by making DVD satisfy the demand of Macrovision authentication at the inner video switch switch that adds of DVD.Wherein:
Y/G, U/B, V/R be through the MEPG decoding chip decode and the video digital-to-analogue conversion after YUV or the rgb signal exported;
Y, U, V are the color difference components signals to television set, are input to TV color difference components port;
S_G, S_B, S_R are to television set SCART port G, B, R signal, are input to TV SCART port.
Its control mode is as follows:
When DVD was set to the output of YUV aberration, Y/G, U/B, V/R exported YUV signal, and the SCART_CON signal of decoding chip output simultaneously is the 0V low level, and K4 organizes switch conduction, and YUV signal is connected to the color difference components port.When DVD was set to SCART output, Y/G, U/B, V/R exported rgb signal, and this moment, the SCART_CON signal of decoding chip output was the 3.3V high level, and K5 organizes switch conduction, and rgb signal is connected to the SCART port.
See also Fig. 2, its logic function is as follows:
Because/EN holds direct ground connection, K6 is in connected state all the time, and is so output only is subjected to the control of K7, promptly only relevant with the input signal SCART_CON of control end IN.TS5V330 has A, B, four groups of alternative logical blocks of C, D, has only used three groups of B, C, D here, and the A group is not used, and is unsettled.
SCART_CON output 3.3V high level, K7 is communicated with S2, just outputs to S_G, S_B, S_R through signal Y/G, U/B, the V/R of DB, DC, DD input, and Y, U, V is in open-circuit condition.
SCART_CON output 0V low level, K7 is communicated with S1, and signal Y/G, the U/B, the V/R that import through DB, DC, DD just output to Y, U, V, and S_G, S_B, S_R are in open-circuit condition.
As mentioned above, existing DVD adopts IC TS5V330 to carry out video switch, and the output of DVD signal is normal, and YUV signal can be from the output of SCART port, and rgb signal can not realized the MICROVISION authentication requesting from the output of YUV color difference components port yet.
At present, existing all outlet ports all need use special chip (for example: TS5V330) as the video switch switch to the type of European market band SCART port, separate the purpose of output to reach vision signal,, therefore cause the complete machine production cost to increase because this special chip cost is higher.
Summary of the invention
The object of the present invention is to provide a kind of video switch circuit, be intended to solve the too high problem of DVD video switch circuit cost in the prior art.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of video switch circuit, described video switch circuit comprise a control module and switch module K1, switch module K2, switch module K3; Wherein, the input of switch module K1 connects the output of DVD decoding chip Y/G signal, and two ports of the output of switch module K1 connect the Y input in the television set color difference components port and the S_G input of television set SCART port respectively; The input of switch module K2 connects the output of described DVD decoding chip U/B signal, and two ports of the output of switch module K2 connect the U input in the television set color difference components port and the S_B input of television set SCART port respectively; The input of switch module K3 connects the output of described DVD decoding chip V/R signal, and two ports of the output of switch module K3 connect the S_R input of V input and television set SCART port in the television set color difference components port respectively; Control module is connected with the control port of switch module K3 with switch module K1, switch module K2 respectively, receive the SCART_CON signal, according to the color difference components port or the SCART port of SCART_CON Signal-controlled switch module K1, switch module K2 and switch module K3 gating television set;
Described control module comprises common SMD silicon NPN triode 3904Q27 and common SMD silicon NPN triode 3904Q28, the collector electrode of described common SMD silicon NPN triode 3904Q28 connects described common SMD silicon NPN triode 3904Q27 base stage through resistance, the base stage of described common SMD silicon NPN triode 3904Q28 connects described SCART_CON signal, when described SCART_CON output low level, described common SMD silicon NPN triode 3904Q28 ends, common SMD silicon NPN triode 3904Q27 conducting, when described SCART_CON exports high level, described common SMD silicon NPN triode 3904Q28 conducting, common SMD silicon NPN triode 3904Q27 ends;
Described switch module K1 comprises common SMD silicon NPN triode 3904Q23 and common SMD silicon NPN triode 3904Q24, described common SMD silicon NPN triode 3904Q23 is connected with common SMD silicon NPN triode 3904Q24 common collector, described common SMD silicon NPN triode 3904Q23 is connected the Y/G signal output port of described DVD decoding chip with the collector electrode of common SMD silicon NPN triode 3904Q24, described common SMD silicon NPN triode 3904Q23 base stage connects the collector electrode of described common SMD silicon NPN triode 3904Q27, and described common SMD silicon NPN triode 3904Q24 base stage connects the collector electrode of described common SMD silicon NPN triode 3904Q28; As described common SMD silicon NPN triode 3904Q28 during by, common SMD silicon NPN triode 3904Q27 conducting, described common SMD silicon NPN triode 3904Q24 conducting, described common SMD silicon NPN triode 3904Q23 ends, and the Y-signal in the described Y/G signal outputs to described television set color difference components port by described common SMD silicon NPN triode 3904Q24; When described common SMD silicon NPN triode 3904Q28 conducting, when common SMD silicon NPN triode 3904Q27 ends, described common SMD silicon NPN triode 3904Q24 ends, described common SMD silicon NPN triode 3904Q23 conducting, the S_G signal in the described Y/G signal outputs to described television set SCART port by described common SMD silicon NPN triode 3904Q23.
More specifically, described switch module K2 comprises common SMD silicon NPN triode 3904Q25 and common SMD silicon NPN triode 3904Q26, described common SMD silicon NPN triode 3904Q25 is connected with common SMD silicon NPN triode 3904Q26 common collector, described common SMD silicon NPN triode 3904Q25 is connected the U/B signal output port of described DVD decoding chip with the collector electrode of common SMD silicon NPN triode 3904Q26, described common SMD silicon NPN triode 3904Q25 base stage connects the collector electrode of described common SMD silicon NPN triode 3904Q27, described common SMD silicon NPN triode 3904Q26 base stage connects the collector electrode of described common SMD silicon NPN triode 3904Q28, when described common SMD silicon NPN triode 3904Q28 ends, during common SMD silicon NPN triode 3904Q27 conducting, described common SMD silicon NPN triode 3904Q26 conducting, described common SMD silicon NPN triode 3904Q25 ends, and the U signal in the described U/B signal outputs to described television set color difference components port by described common SMD silicon NPN triode 3904Q26; When described common SMD silicon NPN triode 3904Q28 conducting, when common SMD silicon NPN triode 3904Q27 ends, described common SMD silicon NPN triode 3904Q26 ends, described common SMD silicon NPN triode 3904Q25 conducting, the S_B signal in the described U/B signal outputs to described television set SCART port by described common SMD silicon NPN triode 3904Q25.
More specifically, described switch module K3 comprises common SMD silicon NPN triode 3904Q29 and common SMD silicon NPN triode 3904Q30, described common SMD silicon NPN triode 3904Q29 is connected with common SMD silicon NPN triode 3904Q30 common collector, described common SMD silicon NPN triode 3904Q29 is connected the V/R signal output port of described DVD decoding chip with the collector electrode of common SMD silicon NPN triode 3904Q30, described common SMD silicon NPN triode 3904Q29 base stage connects the collector electrode of described common SMD silicon NPN triode 3904Q27, described common SMD silicon NPN triode 3904Q30 base stage connects the collector electrode of described common SMD silicon NPN triode 3904Q28, when described common SMD silicon NPN triode 3904Q28 ends, during common SMD silicon NPN triode 3904Q27 conducting, described common SMD silicon NPN triode 3904Q30 conducting, described common SMD silicon NPN triode 3904Q29 ends, and the V signal in the described V/R signal outputs to described television set color difference components port by described common SMD silicon NPN triode 3904Q30; When described common SMD silicon NPN triode 3904Q28 conducting, when common SMD silicon NPN triode 3904Q27 ends, described common SMD silicon NPN triode 3904Q30 ends, described common SMD silicon NPN triode 3904Q29 conducting, the S_R signal in the described V/R signal outputs to described television set SCART port by described common SMD silicon NPN triode 3904Q29.
The present invention overcomes the deficiencies in the prior art, adopt three switch modules of control module control, three switch modules are according to the color difference components signal port or the SCART port of the control gating television set of control module, to television set color difference components port input Y, U, V signal or to the technical scheme of the input of television set SCART port G, B, R signal, circuit reliability height provided by the invention, practical; And all adopt universal component, circuit use and device buying are all very convenient, and circuit cost is lower.
Description of drawings
Fig. 1 is existing DVD video switch control block diagram;
Fig. 2 is the schematic diagram that existing IC TS5V330 realizes video switch;
Fig. 3 is the described video switch circuit schematic diagram of the embodiment of the invention;
Fig. 4 is the described video switch circuit physical circuit of embodiment of the invention figure.
Embodiment
The video switch circuit schematic diagram that the embodiment of the invention provides comprises control module (control circuit) and 3 switch modules (K1, K2 and K3) as shown in Figure 3.Wherein, the input of K1 connects the output of DVD MEPG chip Y/G signal, and two ports of output connect the Y input in the television set color difference components port and the S_G input of television set SCART port respectively; The input of K2 connects the output of DVD MEPG chip U/B signal, and two ports of output connect the U input in the television set color difference components port and the S_B input of television set SCART port respectively; The input of K3 connects the output of DVD MEPG chip V/R signal, and two ports of output connect the V input in the television set color difference components port and the S_R input of television set SCART port respectively; Control module is connected with the control port of K1, K2 and K3 respectively, receives the SCART_CON signal, and selecting the color difference components port of television set according to SCART_CON signal controlling K1, K2 and K3 still is the SCART port.
Specifically, when SCART_CON output 0V low level, control module is controlled the port that the K1 gating is connected with Y input in the television set color difference components port respectively according to this low level signal, the port that control K2 gating is connected with U input in the television set color difference components port, the port that control K3 gating is connected with V input in the television set color difference components port is input to television set color difference components port respectively with Y, U, V signal; When SCART_CON output 3.3V high level, control module is controlled the port that the K1 gating is connected with the S_G input of television set SCART port respectively according to this high level signal, the port that control K2 gating is connected with the S_B input of television set SCART port, control K3 gating and the port that the S_V input of television set SCART port is connected are input to television set SCART input respectively with S_G, S_B, S_R signal.
The physical circuit figure of the video switch circuit that the embodiment of the invention provides as shown in Figure 4, control module in R316 wherein, R317, R321, R323, Q27 and the Q28 corresponding diagram 3, the Q28 C utmost point connects the Q27 B utmost point through R321, and Q27, the Q28C utmost point connect the 5V power supply by R317, R316 respectively, and the base stage of Q28 connects the SCART_CON signal through R323, when the SCART_CON output low level, Q28 ends, and the Q27 conducting is when SCART_CON output high level, the Q28 conducting, Q27 ends.Y-signal in R318, R319, Q23 and the Q24 corresponding diagram 3 and G signaling switch module K1, Q23 is connected with the Q24 common collector, the collector electrode of Q23 and Q24 is connected the Y/G signal output port of DVD decoding chip, the Q23 base stage is through the collector electrode of R318 connection Q27, and the Q24 base stage connects the Q28 collector electrode through R319; As Q28 during by, Q27 conducting, the Q24 conducting, Q23 ends, and the Y-signal in the Y/G signal outputs to television set color difference components port by Q24; When the Q28 conducting, when Q27 ends, Q24 ends, the Q23 conducting, and the S_G signal in the Y/G signal outputs to television set SCART port by Q23.R320, R322, Q25, U signal and B signaling switch module K2 in the Q26 corresponding diagram 3, Q25 is connected with the Q26 common collector, the collector electrode of Q25 and Q26 is connected the U/B signal output port of DVD decoding chip, and the Q25 base stage is through the collector electrode of R320 connection Q27, and the Q26 base stage connects the Q28 collector electrode through R322; As Q28 during by, Q27 conducting, the Q26 conducting, Q25 ends, and the U signal in the U/B signal outputs to television set color difference components port by Q26; When the Q28 conducting, when Q27 ends, Q26 ends, the Q25 conducting, and the S_B signal in the U/B signal outputs to television set SCART port by Q25.V signal and R signaling switch module K3 in R324, R325, Q29 and the Q30 corresponding diagram 3, Q29 is connected with the Q30 common collector, the collector electrode of Q29 and Q30 is connected the V/R signal output port of DVD decoding chip, the Q29 base stage is through the collector electrode of R324 connection Q27, and the Q30 base stage connects the Q28 collector electrode through R325; As Q28 during by, Q27 conducting, the Q30 conducting, Q29 ends, and the V signal in the V/R signal outputs to television set color difference components port by Q30; When the Q28 conducting, when Q27 ends, Q30 ends, the Q29 conducting, and the S_R signal in the V/R signal outputs to television set SCART port by Q29.RL1-RL6 resistance is on the TV circuit, and not on the DVD circuit, S_G, S_B, S_R and Y, U, V meet the RL1-RL6. of TV respectively for ease of circuit analysis, embodies in the drawings.
SCART_CON output 0V low level, the bias voltage at Q28 BE two ends is 0, Q28 is in off-state, make and cause the bias voltage＞3V at Q28 CE two ends Q24, Q26, Q27, Q30 to be in the saturation conduction attitude, thereby make Y, U, V be in the output conducting state, because Q27 is in saturation condition, the bias voltage at Q27 CE two ends drops to about 0.1V, makes Q23, Q25, Q29 be in cut-off state, thereby makes S_G, S_B, S_R be in the output off-state.Just export from the signal of Y/G, U/B, V/R input like this from Y, U, V.
SCART_CON output 3.3V high level, the Q28 saturation conduction makes the bias voltage at Q28 CE two ends drop to about 0.1V, causes Q24, Q26, Q30 to be in off-state, thereby makes Y, U, V be in the output off-state.The bias voltage at Q28 CE two ends drops to 0.1V also makes Q27 be in off-state simultaneously, and the bias voltage＞3V at Q27CE two ends makes Q23, Q25, Q29 be in the saturation conduction state, thereby makes S_G, S_B, S_R be in the output conducting state.Just export from the signal of Y/G, U/B, V/R input like this from S_G, S_B, S_R.
As mentioned above, the video switch circuit that the embodiment of the invention provides makes that the output of DVD signal is normal, and YUV signal can be from the output of SCART port, and rgb signal can not satisfy the MICROVISION authentication requesting from the output of YUV color difference components port yet yet.
By top analysis, the key that realize above-mentioned two kinds of situations is high-low levels that Q23-Q30 is sent according to SCART_CON, enters saturated or cut-off state respectively rapidly, and it is very important that the selection of parameter just seems, continues to select parameter below.
Because triode is as switching circuit in the video switch circuit that the embodiment of the invention provides, operate mainly in off-state and saturated mode, less demanding to multiplication factor, power consumption, so Q23-Q30 selects common SMD silicon NPN triode 3904 commonly used at present for use, 60 times of the minimum multiplication factors of triode, power consumption＜200mW.
The value of R316, R317, R321, R323 is as follows:
Because Q27, Q28 may be in saturation condition, and also will provide enough electric currents to make Q23, Q25, Q29 or Q24, Q26, Q30 saturated, R316, R317 get 1K;
IQ28C?MAX＝(5-UQ28CE)/R316≈4.9/1K＝4.9mA；
IQ28B MIN=4.9mA/60=0.082mA, (β MIN=60, Q28 will enter saturated);
R323 MAX=(3.3-UQ28BE)/IQ28B MIN=2.6/0.082mA ≈ 31K, value 4.7K;
R321 value algorithm is similar, also value 4.7K.
The value of R318, R319, R320, R322, R324, R325 is as follows:
DVD outputting video signal maximum voltage 1V is owing to Q23, Q25, Q29 or Q24, Q26, Q30 may be in saturation condition, so Q23, Q25, Q29, Q24, Q26 and Q30E utmost point maximum voltage also are 1V;
IQ23E?MAX＝UQ23E/RL1＝1/75＝13.3mA，IQ23E≈IQ23C；
IQ23B MIN=13.3/60=0.22mA, (β MIN=60, Q23 will enter saturated);
When Q27 ends, the bias voltage＞3V at CE two ends, i.e. UQ27C＞3V;
R318?MAX＝(UQ27C-UQ23B)/IQ23B?MIN＝(3-1-0.7)/0.22mA
＝1.3V/0.22mA＝5.9K。R318 value 4.7K;
R319, R320, R322, R324, R325 value algorithm are identical, all value 4.7K.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. video switch circuit, described video switch circuit comprise a control module and switch module K1, switch module K2, switch module K3; Wherein, the input of switch module K1 connects the output of DVD decoding chip Y/G signal, and two ports of the output of switch module K1 connect the Y input in the television set color difference components port and the S_G input of television set SCART port respectively; The input of switch module K2 connects the output of described DVD decoding chip U/B signal, and two ports of the output of switch module K2 connect the U input in the television set color difference components port and the S_B input of television set SCART port respectively; The input of switch module K3 connects the output of described DVD decoding chip V/R signal, and two ports of the output of switch module K3 connect the S_R input of V input and television set SCART port in the television set color difference components port respectively; Control module is connected with the control port of switch module K3 with switch module K1, switch module K2 respectively, receive the SCART_CON signal, according to the color difference components port or the SCART port of SCART_CON Signal-controlled switch module K1, switch module K2 and switch module K3 gating television set;
Described control module comprises common SMD silicon NPN triode 3904Q27 and common SMD silicon NPN triode 3904Q28, the collector electrode of described common SMD silicon NPN triode 3904Q28 connects described common SMD silicon NPN triode 3904Q27 base stage through resistance, the base stage of described common SMD silicon NPN triode 3904Q28 connects described SCART_CON signal, when described SCART_CON output low level, described common SMD silicon NPN triode 3904Q28 ends, common SMD silicon NPN triode 3904Q27 conducting, when described SCART_CON exports high level, described common SMD silicon NPN triode 3904Q28 conducting, common SMD silicon NPN triode 3904Q27 ends;
It is characterized in that, described switch module K1 comprises common SMD silicon NPN triode 3904Q23 and common SMD silicon NPN triode 3904Q24, described common SMD silicon NPN triode 3904Q23 is connected with common SMD silicon NPN triode 3904Q24 common collector, described common SMD silicon NPN triode 3904Q23 is connected the Y/G signal output port of described DVD decoding chip with the collector electrode of common SMD silicon NPN triode 3904Q24, described common SMD silicon NPN triode 3904Q23 base stage connects the collector electrode of described common SMD silicon NPN triode 3904Q27, and described common SMD silicon NPN triode 3904Q24 base stage connects the collector electrode of described common SMD silicon NPN triode 3904Q28; As described common SMD silicon NPN triode 3904Q28 during by, common SMD silicon NPN triode 3904Q27 conducting, described common SMD silicon NPN triode 3904Q24 conducting, described common SMD silicon NPN triode 3904Q23 ends, and the Y-signal in the described Y/G signal outputs to described television set color difference components port by described common SMD silicon NPN triode 3904Q24; When described common SMD silicon NPN triode 3904Q28 conducting, when common SMD silicon NPN triode 3904Q27 ends, described common SMD silicon NPN triode 3904Q24 ends, described common SMD silicon NPN triode 3904Q23 conducting, the S_G signal in the described Y/G signal outputs to described television set SCART port by described common SMD silicon NPN triode 3904Q23.
2. video switch circuit according to claim 1, it is characterized in that, described switch module K2 comprises common SMD silicon NPN triode 3904Q25 and common SMD silicon NPN triode 3904Q26, described common SMD silicon NPN triode 3904Q25 is connected with common SMD silicon NPN triode 3904Q26 common collector, described common SMD silicon NPN triode 3904Q25 is connected the U/B signal output port of described DVD decoding chip with the collector electrode of common SMD silicon NPN triode 3904Q26, described common SMD silicon NPN triode 3904Q25 base stage connects the collector electrode of described common SMD silicon NPN triode 3904Q27, described common SMD silicon NPN triode 3904Q26 base stage connects the collector electrode of described common SMD silicon NPN triode 3904Q28, when described common SMD silicon NPN triode 3904Q28 ends, during common SMD silicon NPN triode 3904Q27 conducting, described common SMD silicon NPN triode 3904Q26 conducting, described common SMD silicon NPN triode 3904Q25 ends, and the U signal in the described U/B signal outputs to described television set color difference components port by described common SMD silicon NPN triode 3904Q26; When described common SMD silicon NPN triode 3904Q28 conducting, when common SMD silicon NPN triode 3904Q27 ends, described common SMD silicon NPN triode 3904Q26 ends, described common SMD silicon NPN triode 3904Q25 conducting, the S_B signal in the described U/B signal outputs to described television set SCART port by described common SMD silicon NPN triode 3904Q25.
3. video switch circuit according to claim 1, it is characterized in that, described switch module K3 comprises common SMD silicon NPN triode 3904Q29 and common SMD silicon NPN triode 3904Q30, described common SMD silicon NPN triode 3904Q29 is connected with common SMD silicon NPN triode 3904Q30 common collector, described common SMD silicon NPN triode 3904Q29 is connected the V/R signal output port of described DVD decoding chip with the collector electrode of common SMD silicon NPN triode 3904Q30, described common SMD silicon NPN triode 3904Q29 base stage connects the collector electrode of described common SMD silicon NPN triode 3904Q27, described common SMD silicon NPN triode 3904Q30 base stage connects the collector electrode of described common SMD silicon NPN triode 3904Q28, when described common SMD silicon NPN triode 3904Q28 ends, during common SMD silicon NPN triode 3904Q27 conducting, described common SMD silicon NPN triode 3904Q30 conducting, described common SMD silicon NPN triode 3904Q29 ends, and the V signal in the described V/R signal outputs to described television set color difference components port by described common SMD silicon NPN triode 3904Q30; When described common SMD silicon NPN triode 3904Q28 conducting, when common SMD silicon NPN triode 3904Q27 ends, described common SMD silicon NPN triode 3904Q30 ends, described common SMD silicon NPN triode 3904Q29 conducting, the S_R signal in the described V/R signal outputs to described television set SCART port by described common SMD silicon NPN triode 3904Q29.
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| CN2007101861351A CN101184189B (en) | 2007-12-27 | 2007-12-27 | Video switch circuit |
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| CN2007101861351A CN101184189B (en) | 2007-12-27 | 2007-12-27 | Video switch circuit |
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| CN101184189B true CN101184189B (en) | 2010-09-08 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1137200A (en) * | 1995-05-31 | 1996-12-04 | 明碁电脑股份有限公司 | Signal switching circuit |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1137200A (en) * | 1995-05-31 | 1996-12-04 | 明碁电脑股份有限公司 | Signal switching circuit |
Non-Patent Citations (1)
| Title |
|---|
| TEXAS INSTRUMENTS.TS5V 330 QUAD SPDT WIDE-BANDWITH VIDEO SWITCHWITH LOW ON-STATE RESISTANCE.2004,功能表、功能图,第2、4页. * |
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