CN103149961A - Current supplier and method thereof - Google Patents
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- CN103149961A CN103149961A CN2011104005250A CN201110400525A CN103149961A CN 103149961 A CN103149961 A CN 103149961A CN 2011104005250 A CN2011104005250 A CN 2011104005250A CN 201110400525 A CN201110400525 A CN 201110400525A CN 103149961 A CN103149961 A CN 103149961A
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Abstract
The invention discloses a current supplier and a method thereof. The current supplier provides a differential current through a differential output terminal and comprises a current generator, a current recorder and a differential buffer. The current generator generates a reference current with reference to a first reference voltage and an external equivalent resistor according to a first mode signal and stops generating the reference current according to a second model signal. The current recorder copies the reference current according to the first mode signal and records current information according to a copy result. The current recorder generates a bias current by means of the current information according to the second mode signal. The differential buffer receives the bias current and generates a differential current to the differential output terminal according to a differential input signal.
Description
Technical field
The invention relates to a kind of current supply and its method, but and particularly relevant for a kind of current supply and its method of record current information.
Background technology
Due to the trend of high-speed transfer, the application of differential IO interface (differential input/output interface) has at a high speed become a kind of trend in recent years.For example: universal serial bus (Universal Serial Bus; USB) and additional (the Serial Advanced Technology Attachment of the advanced technology of tandem; SATA) etc., be widely used in various electronic product.
Fig. 1 illustrates the schematic diagram into the current supply of known high speed differential IO interface.Please refer to Fig. 1, current supply 100 comprises P transistor npn npn MP11～MP14, N-type transistor MN11 and operational amplifier 110.Current supply 100 sees through the differential output port that is made of output terminal PN11 and PN12, supplies difference current to external circuit, and wherein Rt11 and Rt12 are the equivalent resistance of external circuit.
In operation, easily be subject to the impact of process drift due to integrated internal resistance in current supply 100, so current supply 100 sees through another output terminal PN13 electric connection one plug-in resistance R ext accurately.In addition, current supply 100 more sees through operational amplifier 110 and the formed feedback mechanism of N-type transistor MN11, provides a reference voltage Vref to plug-in resistance R ext, to form by this accurate bias current I1.Moreover P transistor npn npn MP13 and MP14 will form a current mirroring circuit, and then bias current I1 is mapped to the differential buffer device that is made of P transistor npn npn MP11 and MP12.By this, the differential buffer device can produce corresponding difference current to external circuit according to differential input signal Vd.
In other words, known current supply 100 is except the differential output port (PN11 and PN12) that the supply difference current is set, another output terminal PN13 also must additionally be set be electrically connected plug-in resistance R ext, to form by this accurate bias current I1.Yet this kind practice not only needs to increase the output pin position of current supply 100, has also increased the production cost of current supply 100.
Summary of the invention
The invention provides a kind of current supply, utilize the electric current register to copy reference current, and produce bias current according to copying result.By this, the present invention need not be electrically connected plug-in resistance can produce accurate bias current, and then reduces output pin position and the production cost of current supply.
The invention provides a kind of electric current Supply Method, utilize the current information that records to produce bias current, to reduce by this output pin position and the production cost of current supply.
The present invention proposes a kind of current supply, and it sees through the differential output port difference current is provided.Aforesaid current supply comprises current generator, electric current register and differential buffer device.Wherein, current generator produces reference current according to the first mode signal with reference to the first reference voltage and outside equivalent resistance, and stops producing reference current according to the second mode signal.The electric current register copies reference current according to the first mode signal, and according to copying the outcome record current information, and the electric current register utilizes current information to produce bias current according to the second mode signal.The differential buffer device receives bias current, and produces difference current to the differential output port according to differential input signal.
In one embodiment of this invention, above-mentioned current generator sees through the outside equivalent resistance of output terminal electric connection in the differential output port.
In one embodiment of this invention, above-mentioned electric current register comprises cell current generation unit, switch unit, the first switch, current comparator and current switching control module.Wherein, the cell current generation unit produces a plurality of cell current according to the second reference voltage.Switch unit receiving element electric current, and the general is partly or whole cell current accumulates bias current according to current information.Second switch has first end, the second end and the 3rd end, and the first end of second switch receives bias current, the second end electric connection differential buffer device of second switch.The first input end of current comparator receives reference current, and the second input end of current comparator is electrically connected the 3rd end of second switch, and wherein current comparator is in order to compare reference current and bias current from second switch.The current switching control module is electrically connected output terminal and the switch unit of current comparator, wherein the current switching control module according to the first mode signal first end and the 3rd end of conducting second switch, and adjust according to the comparison result of current comparator or record current information, and the current switching control module exports according to the second mode signal the current information that records, and the first end of conducting second switch and the second end.
In one embodiment of this invention, when above-mentioned reference current and bias current are unequal, current comparator produces the first control signal, adjust current information to cause the current switching control module, when reference current equates with bias current, current comparator produces the second control signal, to cause current switching control module record current information.
The invention provides a kind of electric current Supply Method, comprise the following steps.The first, under first mode, produce reference current with reference to the first reference voltage and outside equivalent resistance, and copy reference current, copy the outcome record current information with foundation.The second, under the second pattern, stop producing reference current, and utilize current information to produce bias current, and receive bias current, to produce difference current to the differential output port according to differential input signal.
Based on above-mentioned, the present invention utilizes the electric current register to copy reference current, and produces bias current according to copying result.By this, the present invention need not be electrically connected plug-in resistance and can produce accurate bias current.In other words, under the present invention can be outside occupying volume not output pin position, cause current supply to produce accurate difference current, and then reduce output pin position and the production cost of current supply.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and coordinate appended graphic being described in detail below.
Description of drawings
Fig. 1 illustrates the schematic diagram into the current supply of known high speed differential IO interface.
Fig. 2 illustrates the schematic diagram into the current supply of foundation one embodiment of the invention.
Fig. 3 illustrates the circuit diagram into the current generator of foundation one embodiment of the invention.
Fig. 4 illustrates the circuit diagram into the electric current register of foundation one embodiment of the invention.
Fig. 5 illustrates the process flow diagram into the electric current Supply Method of foundation one embodiment of the invention.
Fig. 6 illustrates and is the thin section process flow diagram in order to the electric current Supply Method of key diagram 5.
The main element symbol description:
100: known current supply
110: operational amplifier
MP11～MP14:P transistor npn npn
The MN11:N transistor npn npn
PN1～PN3: output terminal
Rext: plug-in resistance
Rt11, Rt12: the equivalent resistance of external circuit
Vs: supply voltage
I1: bias current
Vd: differential input signal
Vref: reference voltage
200: current supply
210: current generator
220: the electric current register
230: the differential buffer device
PN21, PN22: output terminal
Rt21, Rt22: outside equivalent resistance
VI: differential input signal
IO: difference current
MD11: first mode signal
MD12: the second mode signal
VR1, VR2: reference voltage
IR: reference current
IB: bias current
MP21, MP22, MP31, MP32:P transistor npn npn
MN3, MN41～MN44:N transistor npn npn
310,411: operational amplifier
Vs: supply voltage
SW3, SW4, SW41～SW43: switch
410: the cell current generation unit
420: switch unit
430: current comparator
440: the current switching unit
RC: variable resistor
TM41～TM43: 3 terminals of switch SW 4
CTR1: the first control signal
CTR2: the second control signal
IM: current information
I41, I42, I43: unitary current
GND: ground voltage
S510, S520, S530: each steps flow chart of Fig. 5 embodiment
S610, S620, S630, S640, S641, S643: each steps flow chart of Fig. 6 embodiment
Embodiment
Fig. 2 illustrates the schematic diagram into the current supply of foundation one embodiment of the invention.In practical application, current supply 200 sees through the differential output port that is made of output terminal PN21 and PN22, the USB device), and Rt21 and the Rt22 equivalent resistance (also can be described as the school resistance such as outside) in order to represent external circuit provide difference current to external circuit (example mouthful:.In addition, current supply 200 comprises current generator 210, electric current register 220 and differential buffer device 230.Wherein, the output terminal PN21 in current generator 210 electric connection differential output ports.Therefore, on being electrically connected, current generator 210 can see through output terminal PN21 and be electrically connected to outside equivalent resistance Rt22.
In operation, current supply 200 has first mode and the second pattern.Wherein, under first mode, current generator 210 will receive respectively first mode signal MD11 with electric current register 220.In addition, under the second pattern, current generator 210 will receive respectively the second mode signal MD12 with electric current register 220.
Furthermore, under first mode, current generator 210 is understood according to first mode signal MD11, and produces reference current IR with reference to reference voltage VR1 and outside equivalent resistance Rt22.For example, when current generator 210 received first mode signal MD11, current generator 210 can see through output terminal PN21 with received reference voltage VR1 and be passed to outside equivalent resistance Rt22.By this, reference voltage VR1 is with pressure drop externally on equivalent resistance Rt22, and then forms reference current IR.In addition, current generator 210 can export electric current register 220 to reference to electric current I R.At this moment, electric current register 220 also receives first mode signal MD11.In the case, electric current register 220 can copy reference current IR, and according to copying outcome record one current information.
Moreover under the second pattern, current generator 210 can receive the second mode signal MD12, and according to the second mode signal, and stop producing reference current IR.For example, current generator 210 will disconnect reference voltage VR1 to the path of outside equivalent resistance Rt22, and then can't produce reference current IR to electric current register 220.At this moment, electric current register 220 also receives the second mode signal MD12, and electric current register 220 will utilize according to the second mode signal MD12 the current information of noting down to produce bias current IB.
In other words, under first mode, current generator 210 can provide reference current IR to electric current register 220.At this moment, electric current register 220 can copy reference current IR, and according to copying the outcome record current information.And under the second pattern, current generator 210 will disconnect the access path of the output terminal PN21 in itself and differential output port.On the other hand, 220 meetings of electric current register are according to the current information that records when first mode, and generation bias current IB is to differential buffer device 230.
By this, under the second pattern, differential buffer device 230 can receive bias current IB, and produce difference current IO to differential output port (PN21 and PN22) according to input signal VI.Specifically, differential buffer device 230 comprises P transistor npn npn MP21 and P transistor npn npn MP22.The source electrode of P transistor npn npn MP21 and MP22 is electrically connected electric current register 220, and in order to receive bias current IB.The drain electrode of P transistor npn npn MP21 and MP22 is electrically connected differential output port (PN21 and PN22), and the grid of P transistor npn npn MP21 and MP22 receives differential input signal VI.
Under first mode, differential buffer device 230 is disabled state.That is to say, this moment P transistor npn npn MP21 and the grid of MP22 receive the high voltage level and end, so the time differential buffer device 230 do not produce difference current IO.On the other hand, in the time of under the second pattern, differential buffer device 230 is enabled status.That is to say, P transistor npn npn MP21 and the MP22 of this moment will receive differential input signal VI and conducting, and then produce difference current IO to differential output port (PN21 and PN22).
Fig. 3 illustrates the circuit diagram into the current generator of foundation one embodiment of the invention.Please refer to Fig. 3, current generator 210 comprises P transistor npn npn MP31, P transistor npn npn MP32, operational amplifier 310, N-type transistor MN3 and switch SW 3.The source electrode of P transistor npn npn MP31 and MP32 receives supply voltage Vs.The grid of P transistor npn npn MP31 is electrically connected the grid of P transistor npn npn MP32, and drain electrode and the grid of P transistor npn npn MP31 are electrical connected.The drain electrode of P transistor npn npn MP32 is electrically connected the drain electrode of N-type transistor MN3.
Under first mode, switch SW 3 receives first mode signal MD 11, and its first end of conducting according to this and the second end.In addition, operational amplifier 310 and the formed feedback mechanism of N-type transistor MN3 can cause the voltage of the source electrode of N-type transistor MN3 to be pulled up to reference voltage VR1.By this, the position is in switch SW 3 pressure drops that the reference voltage VR1 of the source electrode of N-type transistor MN3 can see through conducting externally on equivalent resistance Rt22, and then forms reference current IR.At this moment, the drain electrode of P transistor npn npn MP32 can receive reference current IR, and P transistor npn npn MP31 and MP32 will form a current mirroring circuit, and then map out reference current IR from the drain electrode of P transistor npn npn MP31.
Under the second pattern, switch SW 3 receives the second mode signal MD12, and its first end of not conducting according to this and the second end.At this moment, MP31 can't receive reference current IR due to the P transistor npn npn, and the current mirroring circuit that therefore is made of P transistor npn npn MP31 and MP32 can't map out reference current IR.
Fig. 4 illustrates the circuit diagram into the electric current register of foundation one embodiment of the invention.Please in the lump with reference to Fig. 2 and Fig. 4, electric current register 220 comprises cell current generation unit 410, switch unit 420, switch SW 4, current comparator 430 and current switching unit 440.Switch SW 4 has first end TM41, the second end TM42 and the 3rd end TM43.The first end TM41 of switch SW 4 receives bias current IB, the second end TM42 company property connection differential buffer device 230 of switch SW 4.The first input end of current comparator 430 receives reference current IR, and the second input end of current comparator 430 is electrically connected the 3rd end TM43 of switch SW 4.Current switching control module 440 is electrically connected output terminal and the switch unit 420 of current comparator 430.In addition, switch unit 420 is electrically connected current generating unit 410, and receiving element electric current I 41～I413.
Cell current generation unit 410 comprises a plurality of N-type transistor MN41～MN44, operational amplifier 411 and variable resistor RC.The drain electrode of N-type transistor MN41～MN44 receives supply voltage Vs, and the source electrode of N-type transistor MN42～MN44 is electrically connected switch unit 420.Operational amplifier 411 has positive input terminal, negative input end and output terminal.The positive input terminal of operational amplifier 411 receives reference voltage VR2, and the negative input end of operational amplifier 411 is electrically connected to the source electrode of N-type transistor MN41, and the output terminal of operational amplifier 411 is electrically connected the grid of N-type transistor MN41～MN44.
The first end of variable resistor RC is electrically connected the source electrode of N-type transistor MN41, and the second termination of variable resistor RC is received ground voltage GND.Wherein, operational amplifier 411 and the formed feedback mechanism of N-type transistor MN41 can cause reference voltage VR2 pressure drop on variable resistor RC, and then form single unitary current.In addition, cell current generation unit 410 more sees through N-type transistor MN42～MN44 and copies a plurality of cell current I41～I43.Switch unit 420 comprises a plurality of switch SW 41～SW43.Wherein, first end receiving element electric current I 41～I43 of switch SW 41～SW43, the second end of switch SW 41～SW43 is electrical connected to produce bias current IB each other.In addition, switch SW 41～SW43 is controlled by respectively current switching unit 440, determines the conducting state of its first end and the second end with foundation current information IM.
Under first mode, current switching control module 440 will receive first mode signal MD11.At the beginning, current switching control module 440 can first transmit in advance set current information IM to switch unit 420 according to first mode signal MD11, first exports initial bias current IB to cause switch unit 420.On the other hand, current switching control module 440 will be according to first mode signal MD11 first end TM41 and the 3rd end TM43 of actuating switch SW4, and then cause bias current IB to be sent to current comparator 430.At this moment, current comparator 430 will compare reference current IR with from the bias current IB of switch SW 4.
If reference current IR and bias current IB are unequal, current comparator 430 will produce the first control signal CTR1, for example: the low level signal.At this moment, current switching control module 440 can be adjusted according to the first control signal CTR1 the numerical value of current information IM, and then causes switch unit 420 to improve the conducting number of its internal switch SW41～SW43, that is increases the current value of bias current IB.In other words, all a value is less than reference current IR if feed back to the bias current IB of current comparator 430, and current comparator 430 will be exported the first control signal CTR1 constantly.By this, current switching control module 440 will constantly increase the numerical value of current information IM, and switch unit 420 can constantly improve the current value of bias current IB.In addition, when bias current IB is promoted to when equating with bias current IB gradually, current comparator 430 will produce the second control signal CTR2, for example: the high levle signal.At this moment, current switching control module 440 will stop adjusting the numerical value of current information IM, and record current information IM at this moment.
For instance, at the beginning, current switching control module 440 can provide in advance set current information IM, and for example, the numerical value of current information IM is 1.Accordingly, the conducting number of the switch SW 41～SW43 of switch unit 420 inside will be 1, and for example: switch SW 41 is conducting, and remaining switch SW 42～SW43 is not conducting.Thus, switch unit 420 can form by single unitary current I41 and be collected the bias current IB that forms.In addition, bias current IB reaches current comparator 430 and compares with reference current IR.If bias current IB is less than reference current IR, current comparator 430 will be exported the first control signal CTR1 to current switching control module 440.At this moment, current switching control module 440 will be according to the numerical value of the cumulative current information IM of the first control signal CTR1, and switch unit 420 will increase the conducting number of its internal switch SW41～SW43 accordingly, to continue to increase the current value of bias current IB.When electric current comparing unit 430 output the second control signal CTR2, represent that reference current IR is equal to bias current IB, so current switching control module 440 will stop the numerical value of cumulative current information IM, and current information IM will be recorded.
As mentioned above, under first mode, current switching control module 440 is the switch SW 41～SW43 in conducting switch unit 420 sequentially, with the tired bias current IB that increases gradually.When bias current IB is accumulate to when equating with reference current IR, current comparator 430 will be exported the second control signal CTR2, with notice current switching control module 440 record current information IM, and make switch unit 420 stop switching the not yet switch of conducting of its inside.In other words, when current comparator 430 detects bias current IB when identical with reference current IR, expression electric current register 220 has been completed the stage of copying reference current IR, and with the conducting number record of switch SW 41～SW43 in current information IM.
On the other hand, under the second pattern, current switching control module 440 will receive the second mode signal MD12.At this moment, current switching control module 440 can be exported the current information IM that records according to the second mode signal MD12 under first mode, produces to cause switch unit 420 the bias current IB that equates with reference current IR.In addition, current switching control module 440 will be according to the second mode signal MD12 first end TM41 and the second end TM42 of actuating switch SW4, and then cause bias current IB to be sent to differential buffer device 230.
Fig. 5 illustrates the process flow diagram into the electric current Supply Method of foundation one embodiment of the invention.Please refer to Fig. 5, based on above-mentioned, the present invention can summarize a kind of electric current Supply Method in an embodiment, and comprises lower routine step.At first, the electrical electricity of output terminal that sees through in the differential output port connects outside equivalent resistance (step S510).In addition, under first mode, produce reference current with reference to the first reference voltage and outside equivalent resistance, and copy reference current, copy outcome record current information (step S520) with foundation.Then, under the second pattern, stop producing reference current, and utilize current information to produce bias current, and receive bias current, to produce difference current to differential output port (step S530) according to differential input signal.
Fig. 6 illustrates and is the thin section process flow diagram in order to the electric current Supply Method of key diagram 5.Please refer to Fig. 6, copying described in step S520 examined electric current with according to the thin section flow process that copies the outcome record current information, can further be subdivided into the following step.At first, produce a plurality of cell current (step S610) according to the second reference voltage.In addition, the general partly or whole cell current accumulates bias current (step S620) according to current information.Moreover, comparison reference current and bias current (step S630), and adjust according to comparison result or record current information (step S640).In step S640, more can be subdivided into the following step., produce the first control signal, and adjust current information (step S641) according to the first control signal when unequal when reference current and bias current.And, when reference current equates with bias current, produce the second control signal, and according to the second control signal record current information (step S643).Wherein, about the detailed description of Fig. 5 and Fig. 6 embodiment, Bao Han is in the embodiment of Fig. 1 to Fig. 4, therefore at this repeated description no longer.
In sum, the invention provides a kind of current supply and electric current Supply Method.Under first mode, current supply will provide reference voltage to outside equivalent resistance producing reference current, and the electric current register will copy reference current and be recorded as current information.Under the second pattern, current supply sees through the current information output bias electric current that records to the differential buffer device.Thus, current supply need not be electrically connected plug-in resistance and can produce accurate bias current.In other words, under the present invention can be outside occupying volume not output pin position, cause current supply to produce accurate difference current, and then reduce output pin position and the production cost of current supply.
Although the present invention discloses as above with embodiment; so it is not to limit the present invention; have in technical field under any and usually know the knowledgeable; without departing from the spirit and scope of the invention; when can do a little change and retouching, thus the present invention's protection domain when with claim scope of the present invention the person of being defined be as the criterion.
Claims (12)
1. a current supply, see through a differential output port one difference current be provided, and it is characterized in that, described current supply comprises:
One current generator produces a reference current according to a first mode signal with reference to one first reference voltage and an outside equivalent resistance, and stops producing described reference current according to one second mode signal;
One electric current register, copy described reference current according to described first mode signal, and according to copying outcome record one current information, and described electric current register utilizes described current information to produce a bias current according to described the second mode signal; And
One differential buffer device receives described bias current, and produces described difference current according to a differential input signal to described differential output port.
2. current supply as claimed in claim 1, is characterized in that, one first output terminal that described current generator sees through in described differential output port is electrically connected described outside equivalent resistance.
3. current supply as claimed in claim 1, is characterized in that, described current generator comprises:
One first operational amplifier has a positive input terminal, a negative input end and an output terminal, and the positive input terminal of described the first operational amplifier receives described the first reference voltage;
One first N-type transistor, its grid is electrically connected the output terminal of described the first operational amplifier, and described the first transistorized source electrode of N-type is electrically connected the negative input end of described the first operational amplifier;
One the one P transistor npn npn, its source electrode receives a supply voltage, and grid and the drain electrode of a described P transistor npn npn are electrical connected, and the drain electrode of a described P transistor npn npn produces described reference current;
One the 2nd P transistor npn npn, its source electrode receives described supply voltage, the grid of described the 2nd P transistor npn npn is electrically connected the grid of a described P transistor npn npn, and the drain electrode of described the 2nd P transistor npn npn is electrically connected described the first transistorized drain electrode of N-type; And
One first switch, its first end is electrically connected described the first transistorized source electrode of N-type, the second end of described the first switch is electrically connected one first output terminal in described differential output port, and described the first switch is according to described first mode signal and its first end of conducting and the second end, and described the second mode signal of foundation and its first end of not conducting and the second end.
4. current supply as claimed in claim 1, is characterized in that, described electric current register comprises:
One cell current generation unit produces a plurality of cell current according to one second reference voltage;
One switches the unit, receives described cell current, and according to described current information and will part or whole described cell current accumulates described bias current;
One second switch has a first end, one second end and one the 3rd end, and the first end of described second switch receives described bias current, the second described differential buffer device of end electric connection of described second switch;
One current comparator, its first input end receives described reference current, the second input end of described current comparator is electrically connected the 3rd end of described second switch, and wherein said current comparator is in order to compare described reference current and described bias current from described second switch;
One current switching control module, be electrically connected output terminal and the described switch unit of described current comparator, wherein said current switching control module is according to described first mode signal and first end and the 3rd end of the described second switch of conducting, and adjust or record described current information according to the comparison result of described current comparator, and described current switching control module exports according to described the second mode signal the described current information that records, and the first end of the described second switch of conducting and the second end.
5. current supply as claimed in claim 3, it is characterized in that, when described reference current and described bias current when unequal, described current comparator produces one first control signal, adjust described current information to cause described current switching control module, when described reference current equated with described bias current, described current comparator produced one second control signal, records described current information to cause described current switching control module.
6. current supply as claimed in claim 4, is characterized in that, described cell current generation unit comprises:
One second operational amplifier has a positive input terminal, a negative input end and an output terminal, and the positive input terminal of described the second operational amplifier receives described the second reference voltage;
A plurality of the second N-type transistors, described the second transistorized drain electrode of N-type receives a supply voltage, described the second transistorized grid of N-type is electrically connected the output terminal of described the second operational amplifier, the source electrode of the one of wherein said the second N-type transistor is electrically connected the negative input end of described the second operational amplifier, and all the other described second transistorized source electrodes of N-type produce described cell current; And
One variable resistor, its first end is electrically connected the negative input end of described the second operational amplifier, and described variable-resistance the second termination is received a ground voltage.
7. current supply as claimed in claim 4, is characterized in that, described switch unit comprises:
A plurality of the 3rd switches, the first end of described the 3rd switch receives described cell current, the second end of described the 3rd switch is electrical connected to produce described bias current, and wherein said the 3rd switch determines the conducting state of its first end and the second end according to described current information.
8. current supply as claimed in claim 1, is characterized in that, described differential buffer device comprises:
One the 3rd P transistor npn npn, its source electrode receives described bias current, and the drain electrode of described the 3rd P transistor npn npn is electrically connected one first output terminal in described differential output port; And
One the 4th P transistor npn npn, its source electrode receives described bias current, the drain electrode of described the 4th P transistor npn npn is electrically connected one second output terminal in described differential output port, and the grid of described the 4th P transistor npn npn and described the 3rd described differential input signal of P transistor npn npn reception.
9. electric current Supply Method is applicable to have the current supply of a differential output port, it is characterized in that, described electric current Supply Method comprises:
Under a first mode, produce a reference current with reference to one first reference voltage and an outside equivalent resistance, and copy described reference current, copy outcome record one current information with foundation; And
Under one second pattern, stop producing described reference current, and utilize described current information to produce a bias current, and receive described bias current, to produce a difference current to described differential output port according to a differential input signal.
10. electric current Supply Method as claimed in claim 9, is characterized in that, described method more comprises:
One first output terminal that sees through in described differential output port is electrically connected described outside equivalent resistance.
11. electric current Supply Method as claimed in claim 9 is characterized in that, copies described reference current, to comprise according to the step that copies the described current information of outcome record:
Produce a plurality of cell current according to one second reference voltage;
According to described current information and will the part or whole described cell current accumulates described bias current;
Compare described reference current and described bias current; And
Adjust or record described current information according to comparison result.
12. electric current Supply Method as claimed in claim 11 is characterized in that, the step of adjusting or record described current information according to comparison result comprises:
, produce one first control signal, and adjust described current information according to described the first control signal when unequal when described reference current and described bias current; And
When described reference current equates with described bias current, produce one second control signal, and record described current information according to described the second control signal.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107632656A (en) * | 2016-07-19 | 2018-01-26 | 扬智科技股份有限公司 | Integrated circuit structure |
| CN110460015A (en) * | 2018-05-08 | 2019-11-15 | 半导体组件工业公司 | Overvoltage crowbar, USB connector and the over-voltage protection method for USB connector |
| CN114489217A (en) * | 2020-11-11 | 2022-05-13 | 扬智科技股份有限公司 | Signal receiving device and bias correction circuit thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1050114A (en) * | 1989-08-03 | 1991-03-20 | 通用电器马可尼有限公司 | High speed cmos differential interface circuits |
| US20030038617A1 (en) * | 2001-08-27 | 2003-02-27 | Yaklin Daniel A. | Self calibrating current reference |
| CN1426166A (en) * | 2002-12-26 | 2003-06-25 | 威盛电子股份有限公司 | Low voltage differential signal transmission device |
| CN101227176A (en) * | 2007-01-19 | 2008-07-23 | 联发科技股份有限公司 | Gain control system and calibration method thereof |
| CN101794556A (en) * | 2009-02-01 | 2010-08-04 | 晨星软件研发(深圳)有限公司 | Current correction method and control circuit thereof |
-
2011
- 2011-12-06 CN CN201110400525.0A patent/CN103149961B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1050114A (en) * | 1989-08-03 | 1991-03-20 | 通用电器马可尼有限公司 | High speed cmos differential interface circuits |
| US20030038617A1 (en) * | 2001-08-27 | 2003-02-27 | Yaklin Daniel A. | Self calibrating current reference |
| CN1426166A (en) * | 2002-12-26 | 2003-06-25 | 威盛电子股份有限公司 | Low voltage differential signal transmission device |
| CN101227176A (en) * | 2007-01-19 | 2008-07-23 | 联发科技股份有限公司 | Gain control system and calibration method thereof |
| CN101794556A (en) * | 2009-02-01 | 2010-08-04 | 晨星软件研发(深圳)有限公司 | Current correction method and control circuit thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107632656A (en) * | 2016-07-19 | 2018-01-26 | 扬智科技股份有限公司 | Integrated circuit structure |
| CN110460015A (en) * | 2018-05-08 | 2019-11-15 | 半导体组件工业公司 | Overvoltage crowbar, USB connector and the over-voltage protection method for USB connector |
| CN110460015B (en) * | 2018-05-08 | 2024-03-08 | 半导体组件工业公司 | Overvoltage protection circuit, USB connector and overvoltage protection method for USB connector |
| CN114489217A (en) * | 2020-11-11 | 2022-05-13 | 扬智科技股份有限公司 | Signal receiving device and bias correction circuit thereof |
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| CN103149961B (en) | 2014-10-22 |
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