CN1177857A - Double-way voltage changer - Google Patents
Double-way voltage changer Download PDFInfo
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- CN1177857A CN1177857A CN 97104047 CN97104047A CN1177857A CN 1177857 A CN1177857 A CN 1177857A CN 97104047 CN97104047 CN 97104047 CN 97104047 A CN97104047 A CN 97104047A CN 1177857 A CN1177857 A CN 1177857A
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Abstract
A bi-directional voltage translator includes a first port, a second port, and a switch circuit. The first port communicates a first signal at a first voltage or a second voltage. The second port communicates a second signal at the first voltage or a third voltage. The second and third voltages are different. The switch circuit is coupled to the first port and the second port. The switch circuit, responsive to the first signal at the first voltage and the second signal at the third voltage, communicates to the second port the second signal at the first voltage. The switch circuit, responsive to the second signal at the first voltage and the first signal at the second voltage, communicates to the first port the first signal at the first voltage.
Description
Relate generally to voltage changer of the present invention more particularly relates to a kind of double-way voltage changer.
Electronic system adopts voltage changer to be connected with the electronic installation that carries out work under different voltage levels, and so sometimes voltage changer is two-way so that help transmitting data.Some existing double-way voltage changer needs a read/write control circuit so that the direction of control data communication, this read/write control line by with electronic installation that this double-way voltage changer is connected in one control, but, restriction on the hardware has hindered that existing electronic installation upgrades very easily so that communicate with the read/write control line, wherein existing electronic installation does not comprise the control circuit that communicates with the read/write control line, equally, connector and the also incompatible read/write control circuit of cable that is used for existing apparatus.
Existing double-way voltage changer also comprises numerous electric component, and they need be encapsulated in the relatively large electric panel room.Be difficult to store and carry for these big encapsulation chambers of mobile subscriber, in addition, these converters must be mechanically connected to electronic installation, make the use that links together of they and electronic installation by cable, perhaps, this cable permanently is mounted in the converter encapsulation chamber, or match with connector, the connector in this connector and the converter chamber is complementary removably.The user usually wishes to carry double-way voltage changer and is connected with the equipment of various occasions treating together with their electronic installation, and these occasions are as in family, in workplace or the travelling.But under the condition of the size that does not increase the transporting bag be used to carry and transmit this device, converter and various cables effectively, electric panel room that this size is considerable and extension cable thereof make to store and become very difficult.
Therefore, needed is a kind of double-way voltage changer of not using the read/write control line, and it includes only the electric component of minimum number so that carry.
A kind of use double-way voltage changer cheaply is provided, and a kind of " used " parts are very profitable equally.
Fig. 1 has illustrated a kind of electronic system that adopts an electronic installation and a two-way voltage changer;
Fig. 2 has illustrated the circuit diagram of the output port that every kind of electronic installation adopted among Fig. 1;
Fig. 3 is the logical schematic of the double-way voltage changer in the key diagram 1;
Fig. 4 is a circuit diagram of replacing embodiment of the double-way voltage changer in the key diagram 1;
Fig. 5 is the circuit diagram of another replacement embodiment of the double-way voltage changer in the key diagram 1;
Fig. 6 is the circuit diagram of a replacement embodiment again of double-way voltage changer in the key diagram 1; With
Fig. 7 remains the circuit diagram of a replacement embodiment again of the double-way voltage changer in the key diagram 1.
Double-way voltage changer comprises one first port, one second port and a switching circuit.First port transmits first signal with first voltage level or second voltage level, second port is with this first voltage level or tertiary voltage level transmissions secondary signal, this second is different with the tertiary voltage level, and switching circuit is connected with second port with first port.Switching circuit transfers to second port with first voltage level with secondary signal in response to the secondary signal under first signal under first voltage level (by first port) and the tertiary voltage level; This switching circuit transfers to first port with first voltage level with first signal in response to first signal under the secondary signal under first voltage level (by second port) and second voltage level.
Fig. 1 has illustrated the electronic system 100 of using double-way voltage changer 102, and electronic system 100 also comprises electronic installation 104, bus 106, electronic installation 108, and bus 110.Electronic installation 104 carries out work with first voltage level, and this first voltage level is provided by the battery 112 that is connected in this, is coupled mutually with double-way voltage changer 102 by bus 106 electronic installations 104; Electronic installation 108 carries out work with second voltage level, and this second voltage level is provided by the battery 114 that is connected in this.In the embodiment of this graphic extension, this first voltage level is different from this second voltage level, be coupled mutually with double-way voltage changer 102 by bus 110 electronic installations 108, in the electronic installation 104 and 108 each can be any one in many such electronic installations, these electronic installations comprise cellular radio, cellular telephone base stations, land connection phone, transceiver radio device, beep-pager, the personal digital assistant, computer, modulator-demodulator, PC memory Card Internation Association (PCMCIA) card, subscriber identification module (SIM) card, the SIM card reader, smart card, intelligent card reading, battery charger, or similar device, thereby " device " as used herein promptly is meant in the equivalent of these and they each.
According to the phase compatible protocol, electronic installation 104 and 108 transfers to logic high and logic low signal on bus 106 and 110 respectively.This agreement is well-known, and is to pass through the while in the both direction transmission signals in common transmission media, and after signal clashed, this agreement allowed to detect and recover signal of communication.
Be received on bus 106 and 110 logic high and the logic low signal of transmission respectively by electronic installation 104 and 108 double-way voltage changers 102, this logic high signal that is in first voltage level that receives from electronic installation 104 by bus 106 is converted to second voltage level by double-way voltage changer 102 and transfers to logic high signal on the bus 110.Transfer to bus 110 by bus 106 this received logic low signal from electronic installation 104 by double-way voltage changer 102.These signals that are positioned on the bus 110 are detected by electronic installation 108.This logic high signal that is in second voltage level that receives from electronic installation 108 by bus 110 converts logic high signal to by double-way voltage changer 102, and this logic high signal is transmitted on the bus 106 with first voltage level.Transfer to bus 106 through bus 110 this received logic low signal from electronic installation 108 by double-way voltage changer 102, these signals that are positioned on the bus 106 are detected by electronic installation 104.
Double-way voltage changer 102, bus 110 and electronic installation 108 can carry out the commerciality encapsulation to form an annex, and as annex 116, it uses with electronic installation 104.In Fig. 1, the electronic circuit that includes annex 116 is illustrated as electronic installation 108 and carries out work with second voltage level that is provided by battery 114.Be connected with electronic installation 104 removably by bus 106 annexes 116, annex 116 can be car accessories, as the hands-free device of cellular radio; One data annex, as modulator-demodulator or pcmcia card, or other is equal to annex.
Some field work in the electronic installation 104 and 108 can be finished by electronic system 100.For example, can use electronic system 100 so that by double-way voltage changer 102, the sign of the cellular radiotelephone system that will export from electronic installation 104 and operating data (electronic serial number, ESN (ESN) and/or Number Assignment Module (NAM) data) transfer to electronic installation 108, wherein electronic installation 104 is a kind of necessary good cellular radios of safeguarding, electronic installation 108 is a kind of creditor's cellular radios; Can use electronic system 100 so that by double-way voltage changer 102, the sign of the sort of cellular radiotelephone system of output from electronic installation 104 and operating data are programmed and transferred to electronic installation 108, wherein electronic installation 104 is programming casees of computer or a kind of special use, and electronic installation 108 is cellular radios; Can use electronic system 100 equally so that by double-way voltage changer 102, rely on the operation that is coupled detection. electronics 104 with electronic installation 108, wherein electronic installation 108 can be the checkout equipment of single part or the whole series (frame).
The logical expression of double-way voltage changer 102 has been done graphic extension in Fig. 3.Double-way voltage changer 102 comprises port 300 and 302, load circuit 304 and 308, and switching circuit 310. Port 300 and 302 is connected to bus 106 and 110 respectively, and load circuit 304 and 308 is connected to port 300 and 302 respectively, and load circuit 304 and 308 comprises power supply V separately
1And V
2, they respectively with corresponding resistance R
1And R
2Be in series power supply V
1And V
2Battery 112 and 114 by electronic installation 104 and 108 provides respectively, wherein is connected with double-way voltage changer 102 with 108 with 110 electronic installations 104 by bus 106.Use another kind of method, power supply V
1And V
2Can provide with electronic installation 104 and 108 power supplys that have nothing to do by one.Although described and illustrate the just part of double-way voltage changer 102, as the selectable technical scheme of another kind, load circuit 304 also can be configured among the electronic installation 104 and/or load circuit 308 also can be configured among the electronic installation 108, as shown in Figure 2.
In the circuit running, when logic low signal did not appear at port 300, load circuit 304 was arranged to V with the voltage level at port 300 places
1, a logic high signal.This logic high signal V
1Transfer to electronic installation 104 through bus 106.V by the communications driver among Fig. 2 200
INEnd, electronic installation 104 receives this logic high signal.When logic low signal did not appear at port 302, load circuit 308 was arranged to V with the voltage level at port 302 places
2, another logic high signal, this logic high V
2Transfer to electronic installation 108 through bus 110, by the V of communications driver 200
INEnd, electronic installation 108 receives this logic high signal.The logic high signal at port 300 and 302 places makes NAND gate 314 switches 312 open, as shown in Figure 3.When electronic installation 104 is excited into the voltage level at port 300 places logic low and therefore transmits a logic low signal by communications driver 200, NAND gate 314 off switch 312.Be transferred to electronic installation 108 through port 302 and bus 110 these logic low signals, by the V of communications driver 200
INEnd, electronic installation 108 receives this logic low signal.When electronic installation 108 is excited into the voltage level at port 302 places logic low and therefore transmits a logic low signal by communications driver 200, NAND gate 314 off switch 312.So be transferred to electronic installation 104 through port 300 and bus 106 these logic low signals, by the V of communications driver 200
INEnd, electronic installation 104 receives this logic low signal.Just as discussed previously, when electronic installation 104 and 108 simultaneously will be separately port 300 and 302 when being excited into low voltage level, common protocol allows to detect and the restore data conflict, Just because of this, circuit double-way voltage changer 102 by bus 106 and 110 allows electronic installation 104 and 108 to transmit data together, so that form a single bidirectional line, and do not use independent voltage changer direction control circuit, as converter read/write control circuit.
Graphic extension is the translation circuit of double-way voltage changer 102 among Fig. 4.Switching circuit 310 comprises transistor unit 400.Transistor unit 400 comprises transistor 402 and diode 404, and transistor 402 comprises pin, and by grid 406, drain electrode 408 and coupling main body and source electrode 410 are formed.Grid 406 is connected to power supply V
3, it is preferably by power supply V
1And V
2Junior power supply.Drain electrode 408 is connected to port 302, and source electrode 410 is connected with port 300, and it is connected in electronic installation 104 and 108 that device with lower voltage level work preferably.Diode 404 comprises anode 412 and negative electrode 414, anode 412 is connected with source electrode 410, negative electrode 414 is connected with drain electrode 408, transistor unit 400 can be the MOSFET (mos field effect transistor) of N channel enhancement mode type, this MOSFET comprises intrinsic diode 404, in this explanation embodiment, transistor unit 400 is single MOSFET, and it will carry out cross-over connection by the logic high signal with various different maximum voltage value that port 300 and 302 transmits with the common gate configuration mode.
Just as discussed previously with reference to Fig. 3, by load circuit 304 and 308 when logic high signal is transferred to electronic installation 104 and 108 respectively, transistor unit 400 is in a kind of " ending " state, " end " state at this, not conducting of transistor 402 is as Fig. 2 and 3 described, when electronic installation 104 is excited into logic low with the voltage level at port 300 places, and when port 302 carried out the signal transmission with logic high, transistor unit 400 became " conducting ".Transistor 402 conductings and be in saturatedly thereby make port 302 become logic low.Just because of this, when logic low signal transmitted at port 300 places, transistor unit 400 was transformed into logic low signal with the logic high signal at port 302 places.As the voltage level at port 302 places being excited into logic low when electronic installation 108 described in Fig. 2 and 3, and carry out signal when transmitting with logic high when port 300, transistor unit 400 becomes " conducting ".Diode 404 is in conducting, and the voltage level at source electrode 410 places is pulled down to about 0.7V to hanging down.In the embodiment of this explanation, the grid of transistor 402 to the threshold voltage of source electrode is less than or equal to V
3-0.7V.When diode 404 conductings, just allow transistor 402 to be in conducting and finally saturated like this, and therefore port 300 is excited into logic low.Just because of this, when logic low signal transmitted at port 302 places, transistor unit 400 was transformed into logic low signal with the logic high signal at port 300 places.Advise as previous, by the load circuit in electronic installation 104 and 108 304 and 08 is configured respectively, double-way voltage changer 102 can be reduced to a single-transistor, use this single-transistor of unit cable to encapsulate, thereby increased the portability of double-way voltage changer 102 and saved the needs that double-way voltage changer 102 is encapsulated separately with bus.
Be another embodiment of double-way voltage changer 102 as shown in Figure 5.Switching circuit 310 adopts two transistor units 500 and 502, in fact each in the transistor unit 500 and 502 all with Fig. 4 in transistor unit 400 similar.Transistor unit 500 comprises transistor 504 and diode 506, and transistor 504 comprises grid 510, drain electrode 512 and one coupling main body and source electrode 514.Grid 510 and power supply V
3Be connected, drain electrode 512 is connected with transistor unit 502, and source electrode 514 is connected with port 300, and diode 506 comprises anode 516 and negative electrode 518, and anode 516 is connected with source electrode 514, and negative electrode 518 512 is connected with draining.Transistor unit 502 comprises transistor 520 and diode 522, and transistor 520 comprises grid 524, drain electrode 526 and one coupling main body and source electrode 528, grid 524 and power supply V
3Be coupled mutually, drain electrode 526 is connected with transistor unit 500, and source electrode 528 is connected with port 302, and diode 522 comprises anode 530 and negative electrode 532, and anode 530 is connected with source electrode 528, and negative electrode 532 526 is connected with draining.
With reference to Fig. 3, just as discussed previously, when logic high signal was transferred to electronic installation 104 and 108 respectively, transistor unit 500 and 502 was in a kind of " ending " state by load circuit 304 and 308." end " state at this, transistor unit 500 and 502 not conductings are as described in Fig. 2 and 3, when electronic installation 104 is excited into logic low with the voltage level at port 300 places, and when port 302 was in logic high, transistor unit 500 became " conducting ".Transistor 504 conductings and be in saturatedly thereby make the drain electrode 526 of transistor unit 502 become logic low.Diode 522 conductings of the transistor unit 502 and voltage level of source electrode 528 is pulled down to about 0.7V to low.In this explanation embodiment, the grid of the transistor 520 of transistor unit 502 to source threshold voltage value is less than or equal to V
3-0.7V, like this, when diode 522 conductings, just allow transistor 520 to be in conducting and finally saturated, and therefore port 302 is excited into logic low, Just because of this, when logic low signal transmitted at port 300 places, transistor unit 500 and 502 logic high signals with port 302 places were transformed into logic low signal.
Described in Fig. 2 and 3, when electronic installation 108 is excited into logic low with the voltage level at port 302 places, and when port 300 was in logic high, transistor unit 502 became " conducting ".Transistor 520 conductings and be in saturatedly thereby make the drain electrode 512 of transistor unit 500 become logic low.Diode 506 conductings of the transistor unit 500 and voltage level of source electrode 514 is pulled down to about 0.7V to low.In this explanation embodiment, the grid of the transistor 504 of transistor unit 500 is less than or equal to V to the source threshold voltage value
3-0.7V, like this, when diode 506 conductings, just allow transistor 504 to be in conducting and finally saturated, and therefore port 300 is excited into logic low, Just because of this, when logic low signal transmitted at port 302 places, transistor unit 500 and 502 logic high signals with port 300 places were transformed into logic low signal.It will be recognized by those skilled in the art as power supply V
3When not powering among Fig. 5 the configuration of transistor unit 500 and 502 configuration and especially diode 506 and 522 can make port 300 and port 302 keep apart.
In Figure 4 and 5, if double-way voltage changer 102 is the converter of 3V to 5V, then power supply V
1, V
2And V
3Suitable value be respectively 3V, 5V and 3V, and resistance R
1And R
2Appropriate value be 15K Ω, be appreciated that resistance R
1And R
2Other values also can use.
Fig. 6 has illustrated that double-way voltage changer 102 selectively can be denoted as 600 by several transistor units 400, and several load circuits 304 with different electrical power voltage are denoted as 602, and series connection is formed mutually.Several buses 106 of 604 of being denoted as are connected with several load circuits 602 with 110.In several transistor units 600 each both had been connected between per two load circuits in several load circuits 602, be connected in again in several groups of buses 604 between per two groups of buses, wherein load circuit provides different logic highs, specifically, a load circuit of each a pair of load circuit in the source electrode of each transistor unit in several transistor units 600 and the several load circuits 602 is connected, and wherein load circuit 602 provides two smallers in the logic high.Each transistor drain in several transistor units 600 is connected with each load circuit to load circuit in several load circuits 602, wherein load circuit 602 provides two the greater in the logic high, such connected mode can produce a kind of converter, it can be compatible mutually with the electronic installation of a wide area array scope, wherein each is carried out work with different voltage levels, and is connected with converter by one in several buses 604.
It shown in Fig. 7 the another embodiment of double-way voltage changer 102.Switching circuit 310 has adopted transistor unit 700, and transistor unit 700 comprises transistor 702.Transistor 702 comprises grid 708, drain electrode 710, source electrode 712 and main body 714.Grid 708 and power supply V
4Be connected, it preferably by with power supply V
1And V
2In the junior be connected and be powered.Drain electrode 710 is connected with port 300, and source electrode 712 is connected with port 302, and in this explanation embodiment, the grid of transistor 702 to source threshold voltage is lower than V
4Transistor 702 can consider to adopt a kind of like this MOSFET, and it can be by for example in an integrated circuit or four-terminal device encapsulation, produces with the independent ways of connecting of main body 714 allowing.Main body 714 ground connection, thereby make drain electrode 710 and source electrode 712 can as one man work basically.The embodiment that is different from Fig. 3-6, source electrode 712 needn't with port 300 and 302 in one be connected, it can be pulled to V by load circuit 304 and 308
1And V
2In bigger that, therefore, drain electrode 710 can be connected with port 302, and source electrode 712 can be connected with port 300, intrinsic diode 716 and 718 have been produced in the manufacturing of transistor unit 700, shown in the figure chain-dotted line.Intrinsic diode 716 is connected in main body 714 and drains between 710, and intrinsic diode 718 is connected between main body 714 and the source electrode 712.As power supply V
4When not powering, transistor unit 700 is kept apart port 300 and port 302, in operating process, if in port 300 and 302 one is energized logic low (and when in port 300 and 302 another carries out the signal transmission with logic high), the transistor 702 of transistor unit 700 is in conducting and is excited into logic low with one in port 300 and 302.
Although being implemented as, the switching circuit 310 of double-way voltage changer 102 uses one or many MOSFET devices, but one skilled in the art will realize that other transistor unit, also can use as BJT, but, need a relative higher conducting electric current with the MOSFET device BJT that compares, in low application of power, for example 3V is in the voltage changer of 5V, and predictable BJT of being to use rather than MOSFET can postpone or stop fully the conducting of switching circuit 310.
In Fig. 1-7, double-way voltage changer 102 is described, Fig. 1-7 is retouched the single bidirectional line that divides bus 106 and 110 into, can recognize that above embodiment is compatible mutually with the multi-line bus that is used to transmit these signals, for example be used for three-way bus by the radio telephone product of Motorola Inc.'s manufacturing and sale, product for a more than line, the whole embodiment of Fig. 2-7 all can repeated application for each added communications circuit of multiwire bus, that is to say that each extension wire needs a single-transistor device and two load circuits.
Therefore, can use double-way voltage changer, its allows two to have not mutually that the electronic installation of compatible voltage level communicates by a single bidirectional line under the condition of not using independent direction control line, so also can allow at need not be to existing cable additional other circuit or electronic installation is added under the condition of other hardware and use double-way voltage changer.Double-way voltage changer is operated and has been used a kind of single line " used " transistor with low power level and realizes it, Just because of this, the cost of double-way voltage changer is reduced to minimum, when with unit cable with single-transistor (have or do not have load circuit) when encapsulating with bus, the portability of double-way voltage changer has improved, thereby having saved needs to the encapsulation of double-way voltage changer, package and bus are kept apart.
Claims (10)
1. double-way voltage changer is characterized in that comprising:
One first port, one that is used for one first voltage level and one second voltage level transmits one first signal;
One second port, one that is used for described first voltage level and a tertiary voltage level transmits a secondary signal, and described tertiary voltage level is different from described second voltage level;
A switching circuit, functionally be connected in described first port and described second port, in response to described first signal under described first voltage level and the described secondary signal under the described tertiary voltage level, described switching circuit transfers to described second port with described first voltage level with described secondary signal; And in response to described first signal under described secondary signal under described first voltage level and described second voltage level, described switching circuit transfers to described first port with described first voltage level with described first signal.
2. double-way voltage changer as claimed in claim 1, it is characterized in that described switching circuit comprises a first terminal, one second terminal, with one the 3rd terminal, described the first terminal is connected with described first port, described second terminal is connected with described second port, is connected with first power supply that carries out work at described second voltage level with described the 3rd terminal.
3. a double-way voltage changer as claimed in claim 1 is characterized in that described switching circuit comprises a FET device.
4. double-way voltage changer as claimed in claim 3 is characterized in that described FET device comprises:
A FET has a source electrode, a drain electrode and a grid, and described source electrode is connected with described first port, and described drain electrode is connected with described second port, is connected with first power supply that carries out work with described second voltage level with described grid.
A diode has an anode and a negative electrode, and described anode is connected with described first port, is connected with described second port with described negative electrode.
5. a double-way voltage changer as claimed in claim 4 is characterized in that, described tertiary voltage level is greater than described second voltage level.
6. double-way voltage changer as claimed in claim 1, it is characterized in that, one the 4th voltage level in response to described first port, described switching circuit connects described first port and described second port, and described the 4th voltage level is not less than described first voltage level and is not more than described second voltage level.
7. a double-way voltage changer as claimed in claim 1 is characterized in that, described switching circuit comprises:
One first switch has a first terminal, one second terminal and one the 3rd terminal, and described the first terminal is connected with described first port, and described the 3rd terminal is coupled mutually with first power supply that carries out work with described second voltage level; With
One second switch has one the 4th terminal, five terminal and one the 6th terminal, and described the 4th terminal is connected with described second port, and described five terminal is connected with described second terminal, and described the 6th terminal is connected with described the 3rd terminal.
8. a double-way voltage changer as claimed in claim 7 is characterized in that, described switching circuit comprises:
One first diode has one the 7th terminal and one the 8th terminal, and described the 7th terminal is connected with described first port, is coupled mutually with described second terminal of described first switch with described the 8th terminal; With
One second diode has one the 9th terminal and 1 the tenth terminal, and described the 9th terminal is connected with described second port and described five terminal of described the tenth terminal and described second switch is coupled mutually.
9. annex is characterized in that:
Carry out the annex circuit of work with first voltage level;
One first port is coupled to described annex circuit so that transmit one first signal with one in described first voltage level and one second voltage level;
One second port is connected with an electronic installation, and described second port transmits a secondary signal with one in described second voltage level and the tertiary voltage level, and described tertiary voltage level is different from described first voltage level; With
One switching circuit, functionally be connected to described first port and described second port, in response to described first signal under described second voltage level and the described secondary signal under the described tertiary voltage level, described switching circuit transfers to described second port with described second voltage level with described secondary signal; With in response to described first signal under described secondary signal under described second voltage level and described first voltage level, described switching circuit transfers to described first port with described second voltage level with described first signal.
10. an annex as claimed in claim 9 is characterized in that
Also comprise a power supply that carries out work with described first voltage level; And
It is characterized in that described switching circuit comprises a FET, this FET has one source pole, a grid and a drain electrode, and described source electrode is connected with described second port, and described drain electrode is connected with described annex circuit, and described grid is connected with described power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97104047 CN1177857A (en) | 1996-04-23 | 1997-04-22 | Double-way voltage changer |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/636,358 | 1996-04-23 | ||
| CN 97104047 CN1177857A (en) | 1996-04-23 | 1997-04-22 | Double-way voltage changer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1177857A true CN1177857A (en) | 1998-04-01 |
Family
ID=5167087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97104047 Pending CN1177857A (en) | 1996-04-23 | 1997-04-22 | Double-way voltage changer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1177857A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100407578C (en) * | 2002-11-22 | 2008-07-30 | 模拟器件公司 | level converting digital switch |
| CN105939157A (en) * | 2015-03-03 | 2016-09-14 | 卡西欧计算机株式会社 | Level shifter and projector |
-
1997
- 1997-04-22 CN CN 97104047 patent/CN1177857A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100407578C (en) * | 2002-11-22 | 2008-07-30 | 模拟器件公司 | level converting digital switch |
| CN105939157A (en) * | 2015-03-03 | 2016-09-14 | 卡西欧计算机株式会社 | Level shifter and projector |
| US10102791B2 (en) | 2015-03-03 | 2018-10-16 | Casio Computer Co., Ltd. | Level shifter and projector |
| US10748470B2 (en) | 2015-03-03 | 2020-08-18 | Casio Computer Co., Ltd. | Level shifter and projector |
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