CN104732905B - Transformer - Google Patents
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- CN104732905B CN104732905B CN201310721941.XA CN201310721941A CN104732905B CN 104732905 B CN104732905 B CN 104732905B CN 201310721941 A CN201310721941 A CN 201310721941A CN 104732905 B CN104732905 B CN 104732905B
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Abstract
A kind of transformer, including：The first transistor, its connection first node that drains, its grid receives input signal, and its source electrode connects the first supply voltage；Second transistor, its connection section point that drains, its grid receives anti-phase input signal, and source electrode connects the first supply voltage；Third transistor, its source electrode connection second source voltage, its connection first node that drains, and its grid connection section point；4th transistor, its source electrode connection second source voltage, its connection section point that drains, its grid connection first node, first node as one first output end to produce anti-phase output signal, and section point system as the second output end to produce output signal；On-off circuit, connect between first node and section point, on-off circuit is controlled by an enable signal；When input signal changes level, a period of time is acted using enable signal control switch circuit, and then causes output signal conversion level.
Description
Technical field
The present invention relates to a kind of transformer, more particularly to a kind of transformer that can effectively reduce layout area.
Background technology
Transformer can the less input signal of reception signal scope, and it is accordingly converted to larger defeated of range of signal
Go out signal, be the important composition module in interface circuit.For example, in the source electrode driver of driving display panel（source
driver）In chip, the range of signal of its original control signal can be 0 to 1.5 volts, and export to driving display panel
During source electrode, required range of signal may will be changed and be expanded to 0 to 5 volts.In order to be changed between two kinds of range of signals,
Transformer is just needed to use, 0 to 1.5 volts of input signal to be converted to 0 to 5 volts of output signal.
Referring to Figure 1A and Figure 1B, existing transformer 10 of the prior art can by range of signal between voltage VDD1 extremely
GND input signal IN switchs to range of signal in voltage VDD2 to the output signal OUT between GND.Wherein, VDD1 is the first power supply
Voltage (such as 1.5 volts), VDD2 are second source voltage (such as 5 volts), and GND is ground voltage (such as 0 volt), its
In, second source voltage VDD2 is more than the first supply voltage VDD1, and the first supply voltage VDD1 is more than ground voltage GND.
Transformer 10 includes one first P-type transistor MP1, the second P-type transistor MP2, the first N-type transistor MN1 and the
Two N-type transistor MN2, wherein, the first P-type transistor MP1 source electrode connection second source voltage VDD2, drain electrode connection first segment
Point (a), grid connection section point (b).Second P-type transistor MP2 source electrodes connect second source voltage VDD2, drain electrode connection the
Two nodes (b), grid connection first node (a).
In addition, the first N-type transistor MN1 drain electrode connection first nodes (a), source electrode connection ground voltage GND, grid receive
Input signal IN.Second N-type transistor MN2 drain electrode connection section points (b), source electrode connection ground voltage GND, grid receives anti-
The input signal INB of phase.Wherein, first node (a) is as the first output end, for producing reversed-phase output signal OUTB, and
Section point (b) is as the second output end, for producing output signal OUT.
When the input signal (IN) of transformer 10 is 1.5 volts and rp input signal (INB) is 0 volt, the first N-type
Transistor MN1 and the second P-type transistor MP2 actions (turn on), the second N-type transistor MN2 and the first P-type transistor MP1 are not
Act (turn off).Therefore, second source the voltage VDD2, reversed-phase output signal OUT that output signal OUT is 5 volts are 0 volt
Special ground voltage GND.
When the input signal (IN) of transformer 10 is 0 volt and rp input signal (INB) is 1.5 volts, the first N-type
Transistor MN1 and the second P-type transistor MP2 is failure to actuate (turn off), the second N-type transistor MN2 and the first P-type transistor
MP1 acts (turn on).Therefore, output signal OUT is 0 volt of ground voltage GND, and reversed-phase output signal OUT is 5 volts
Second source voltage VDD2.
The shortcomings that existing transformer 10, is that layout area is too big, and output signal OUT pollings (transition
Period) oversize and power consumption (power consumption) is too high.
Describe in detail as follows：
As shown in Figure 1B, turned when input signal IN is converted to 0 volt and rp input signal INB by 1.5 volts by 0 volt
1.5 volts of moment is changed to, the second N-type transistor MN2 can be opened simultaneously with the second P-type transistor MP2, and then produce short circuit electricity
Flow Is.
In order to allow output signal OUT and reversed-phase output signal OUTB can smoothly transition, it is necessary to be designed to large-size
(size) the first N-type transistor (MN1) and the second N-type transistor (MN2), make it possess larger driving force
(driving strength).In other words, it is necessary to be specifically designed N-type transistor and p-type in the design of existing transformer 10
The dimension scale of transistor, wherein, the size of N-type transistor is greater than the size of P-type transistor.
However, above-mentioned design is excessive by the layout area for making whole transformer 10, and output signal OUT pollings are too
Grow and the shortcomings that short circuit current is excessive be present.
From Figure 1B, output signal OUT and reversed-phase output signal OUTB polling Tt is about 19ns, short circuit current
Is maximums are about 50 μ A, and average short circuit current is about 15.4 μ A.
The content of the invention
In view of this, the present invention provides a kind of transformer, and it, which can be realized, efficiently reduces layout area, and can shorten
Output signal OUT polling, and more power saving.
The present invention provides a kind of transformer, and input signal is converted to output signal by the transformer, and it includes：First is brilliant
Body pipe, drain electrode connection first node, grid receive the input signal, and source electrode connects the first supply voltage；Second transistor, leakage
Pole connects section point, and grid receives anti-phase input signal, and source electrode connects first supply voltage；Third transistor, source
Pole connects second source voltage, and drain electrode connects the first node, and grid connects the section point；4th transistor, source electrode
The second source voltage is connected, drain electrode connects the section point, and grid connects the first node, and the first node is made
It is used to produce anti-phase output signal for the first output end, and the section point is described defeated for producing as the second output end
Go out signal；And on-off circuit, it is connected between the first node and the section point, and the on-off circuit is controlled by
Enable signal；When the input signal changes level, the on-off circuit is controlled to act the time using the enable signal
Cycle so that the output signal changes level.
Brief description of the drawings
Figure 1A and Figure 1B is existing transformer circuit diagram and its coherent signal schematic diagram；
Fig. 2A and Fig. 2 B are the first embodiment circuit diagram and its coherent signal schematic diagram of the transformer of the present invention；
Fig. 3 is the second embodiment circuit diagram of the transformer of the present invention.
Embodiment
Transformer provided by the invention can be realized by smallest size of transistor.Therefore, the layout area of transformer is big
Width reduces, and the present invention possesses the advantages of output signal OUT pollings are short and power consumption is few.
Realization of the present invention is illustrated below in conjunction with the accompanying drawings：
Referring to Fig. 2A and Fig. 2 B, transformer 20 of the present invention will can switch to be situated between voltage VDD1 to GND input signal IN
In voltage VDD2 to the output signal OUT between GND.Wherein, VDD1 is the first supply voltage (such as 1.5 volts), VDD2
Two supply voltages (such as 5 volts), GND are ground voltage (such as 0 volt)；Second source voltage VDD2 is more than the first power supply electricity
VDD1 is pressed, and the first supply voltage VDD1 is more than ground voltage GND.
Transformer 20 includes an on-off circuit SW, one first P-type transistor MP1, the second P-type transistor MP2, the first N-type
Transistor MN1 and the second N-type transistor MN2.Specifically, the P-type transistor as described in on-off circuit SW of the present invention is P-type transistor
Drain electrode and source electrode be on-off circuit SW both ends, and the grid of the P-type transistor is on-off circuit SW control terminal.When
So, on-off circuit SW of the invention can also be N-type transistor, and drain electrode and the source electrode of the same N-type transistor are switch electricity
Road SW both ends, and the grid of the P-type transistor is on-off circuit SW control terminal.
First P-type transistor MP1 source electrodes connection second source voltage VDD2；Drain electrode connection first node (a)；Grid connects
Section point (b).Second P-type transistor MP2 source electrodes connection second source voltage VDD2；Drain electrode connection section point (b)；Grid
Connect first node (a).
First N-type transistor MN1 drain electrode connection first nodes (a)；Source electrode connection ground voltage GND；Grid receives input
Signal IN.Second N-type transistor MN2 drain electrode connection section points (b)；Source electrode connection ground voltage GND；Grid receives anti-phase
Input signal INB.Wherein, first node (a) is used as the first output end, produces reversed-phase output signal OUTB；Section point (b) is made
For the second output end, output signal OUT is produced.
Compared compared with transformer, the present invention further increases an on-off circuit SW, the control of the on-off circuit SW
One enable signal (EN) of end connection, and the both ends of the on-off circuit SW connect first node (a) and section point (b) respectively.
In output signal OUT and reversed-phase output signal OUTB polling, first briefly enable (enable) described on-off circuit
Mono- time cycle of SW so that on-off circuit SW acts (turn on), so as to reduce first node (a) and section point (b) it
Between voltage difference；Then forbidden energy (disable) the on-off circuit SW again so that on-off circuit SW is failure to actuate (turn off).
So, short circuit current can be greatly reduced, and shorten output signal OUT polling.
When the steady state that the input signal (IN) of transformer 20 is 1.5 volts and rp input signal (INB) is 0 volt
When (steady state), on-off circuit SW forbidden energy, the first N-type transistor MN1 and the second P-type transistor MP2 act (turn
On), the second N-type transistor MN2 and the first P-type transistor MP1 are failure to actuate (turn off).Therefore, output signal OUT is 5 volts
Special second source voltage VDD2, reversed-phase output signal OUT is 0 volt of ground voltage GND.
When the steady state that the input signal (IN) of transformer 20 is 0 volt and rp input signal (INB) is 1.5 volts
When, on-off circuit SW forbidden energy, the first N-type transistor MN1 and the second P-type transistor MP2 are failure to actuate (turn off), the second N-type
Transistor MN2 and the first P-type transistor MP1 actions (turn on).Therefore, output signal OUT is 0 volt of ground voltage
GND, reversed-phase output signal OUT are 5 volts of second source voltage VDD2.
Referring to Fig. 2 B, when input signal IN is converted to 0 volt and rp input signal INB by 0 volt of conversion by 1.5 volts
For 1.5 volts of moment, enable signal EN enable (enable) on-off circuits SW so that on-off circuit SW acts (turn on).
Now, the voltage difference contracting between first node (a) and section point (b) is caused due to charge share (charge sharing)
It is small.For example, output signal OUT is down to 2 volts by 5 volts, reversed-phase output signal OUTB rises to 3 volts by 0 volt.
In addition, as enable signal EN forbidden energy (disable) on-off circuit SW, output signal OUT is down to by 2 volts at once
0 volt, reversed-phase output signal OUTB rises to 5 volts by 3 volts, and completes polling Tt.Therefore, on-off circuit SW is closed
The time cycle closed can be considered output signal OUT polling Tt.
Therefore, the output signal OUT of transformer 20 of the present invention and reversed-phase output signal OUTB polling Tt is about 6ns,
Short circuit current Is maximums are about 68 μ A, and average short circuit current is about 4.5 μ A.Compared with existing transformer, the present invention turns pressure
Device possesses the advantages of output signal OUT pollings are short and power consumption is few.
Further, since output signal OUT polling, using charge share by first node (a) and section point (b)
Between voltage difference reduce, therefore and the dimension scale that need not be specifically designed between N-type transistor and P-type transistor, only need
Extremely realize transformer of the present invention using N-type transistor and the P-type transistor of minimum dimension, you can allow output signal OUT with it is anti-
Phase output signal OUTB successfully transitions.Therefore, the layout area of transformer can also significantly reduce.
Referring to Fig. 3, the transformer 30 of another embodiment of the present invention can be by between voltage VDD1 to VDD2 input signal IN
Switch to the output signal OUT between voltage VDD2 to GND.Wherein, VDD1 is the first supply voltage (such as 3.5 volts), VDD2
For second source voltage (such as 5 volts), GND is ground voltage (such as 0 volt)；That is second source voltage VDD2 is more than first
Supply voltage VDD1, and the first supply voltage VDD1 is more than ground voltage GND.
Transformer 30 includes an on-off circuit SW, one first P-type transistor MP1, the second P-type transistor MP2, the first N-type
Transistor MN1 and the second N-type transistor MN2.Specifically, the on-off circuit SW of second embodiment can be N-type transistor or p-type
Transistor, it is respectively on-off circuit SW both ends that it, which drains with source electrode, and grid is on-off circuit SW control terminal.
First P-type transistor MP1 source electrodes connection second source voltage VDD2；Drain electrode connection first node (a)；Grid receives
Input signal IN.Second P-type transistor MP2 source electrodes connection second source voltage VDD2；Drain electrode connection section point (b)；Grid
Receive rp input signal INB.
Further, the first N-type transistor MN1 drain electrode connection first nodes (a)；Source electrode connection ground voltage GND；Grid
Connect section point (b).Second N-type transistor MN2 drain electrode connection section points (b)；Source electrode connection ground voltage GND；Grid
Connect first node (a).Wherein, first node (a) is as the first output end, for producing reversed-phase output signal OUTB, and
Section point (b) is as the second output end, for producing output signal OUT.
On-off circuit SW control terminal connects an enable signal (EN), and the both ends of the on-off circuit SW connect the respectively
One node (a) and section point (b).
Similarly, the transformer 30 of second embodiment is in output signal OUT and reversed-phase output signal OUTB polling,
First briefly enable (enable) described on-off circuit SW so that on-off circuit SW acts (turn on) to reduce first node
(a) voltage difference between section point (b)；And then forbidden energy (disable) the on-off circuit SW so that on-off circuit
SW is failure to actuate (turn off).In this way, short circuit current can be greatly reduced, and shorten output signal OUT transition
Journey.Its detailed operating principle is identical with first embodiment, and here is omitted.
From above-mentioned explanation, the advantage of the invention is that the layout area of transformer can efficiently reduce, and
Output signal OUT polling, and more power saving can be shortened.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements done etc., should be included within the scope of protection of the invention with principle.
Claims (15)
- A kind of 1. transformer, for input signal to be converted into output signal, it is characterised in that including：The first transistor, there is the first drain electrode to be connected to first node, and first grid receives the input signal, and the first source Pole connects the first supply voltage；Second transistor, there is the second drain electrode to connect section point, and second grid receives anti-phase input signal, and the second source Pole connects first supply voltage；Third transistor, the 3rd source electrode connection second source voltage, the 3rd drain electrode connect the first node, and the 3rd grid Connect the section point；4th transistor, the 4th source electrode connect the second source voltage, and the 4th drain electrode connects the section point, and the 4th Grid connects the first node, and the first node is the first output end to produce anti-phase output signal, and described second Node is the second output end to produce the output signal；AndOn-off circuit, it is connected between the first node and the section point, the switch is controlled according to enable signal Circuit；When the input signal changes level, the on-off circuit is controlled to be moved in a period of time using the enable signal Make, so as to reduce the voltage difference between first node and section point so that the output signal changes level；When the input signal is a high levle, and anti-phase input signal is a low level, controls the on-off circuit motionless Make, the first transistor and the 4th transistor action, the second transistor are failure to actuate with the third transistor, made The output signal is the second source voltage and anti-phase output signal is first supply voltage.
- 2. transformer as claimed in claim 1, it is characterised in that the first transistor is that N-type is brilliant with the second transistor Body pipe, and the third transistor and the 4th transistor are P-type transistor.
- 3. transformer as claimed in claim 2, it is characterised in that the second source voltage is more than first supply voltage.
- 4. transformer as claimed in claim 3, it is characterised in that the voltage of the input signal is less than or equal to 1.5 volts And more than or equal to 0 volt, the range of signal of the output signal is less than or equal to 5 volts of voltage and is more than or equal to 0 volt, the second source voltage is 5 volts, and first supply voltage is 0 volt.
- 5. transformer as claimed in claim 1, it is characterised in that when the input signal is converted to low level by high levle, The on-off circuit acts within the time cycle, and causes the first node to carry out electric charge point with the section point Enjoy.
- 6. transformer as claimed in claim 5, it is characterised in that when the input signal is converted to low level by high levle, control Make the on-off circuit to act after the time cycle, the output signal is first supply voltage, and anti-phase Output signal is the second source voltage.
- 7. transformer as claimed in claim 6, it is characterised in that when the input signal is low level, and anti-phase input is believed Number it is high levle, when controlling the on-off circuit to be failure to actuate, the first transistor is failure to actuate with the 4th transistor, described Second transistor and the third transistor act so that the output signal is first supply voltage, and anti-phase defeated It is the second source voltage to go out signal.
- 8. transformer as claimed in claim 1, it is characterised in that the on-off circuit is a transistor, described in its grid receives Enable signal, and drain electrode are respectively connecting to the first node and the section point with source electrode.
- 9. transformer as claimed in claim 1, it is characterised in that the first transistor is that p-type is brilliant with the second transistor Body pipe, and the third transistor and the 4th transistor are N-type transistor.
- 10. transformer as claimed in claim 9, it is characterised in that first supply voltage is more than the second source voltage.
- 11. transformer as claimed in claim 10, it is characterised in that the voltage of the input signal is more than or equal to 3.5 volts Special and less than or equal to 5 volts, the voltage of the output signal is less than or equal to 5 volts and more than or equal to 0 volt, The second source voltage is 0 volt, and first supply voltage is 5 volts.
- 12. transformer as claimed in claim 9, it is characterised in that the input signal is low level, and anti-phase input signal For high levle, controlling switch circuit is failure to actuate, the first transistor and the 4th transistor action, the second transistor It is failure to actuate with the third transistor so that the output signal is the second source voltage, and anti-phase output signal is First supply voltage.
- 13. transformer as claimed in claim 12, it is characterised in that when the input signal is converted to high levle by low level, Control the on-off circuit to be acted within the time cycle, and cause the first node to carry out electric charge with the section point Share.
- 14. transformer as claimed in claim 13, it is characterised in that the input signal is converted to high levle by low level, control Make the on-off circuit to act after the time cycle, the output signal is first supply voltage, and anti-phase Output signal is the second source voltage.
- 15. transformer as claimed in claim 14, it is characterised in that the input signal is high levle, and anti-phase input is believed Number it is low level, controls the on-off circuit to be failure to actuate, the first transistor is failure to actuate with the 4th transistor, and described Two-transistor acts with the third transistor so that the output signal is first supply voltage and reversed-phase output signal For the second source voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310721941.XA CN104732905B (en) | 2013-12-24 | 2013-12-24 | Transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310721941.XA CN104732905B (en) | 2013-12-24 | 2013-12-24 | Transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104732905A CN104732905A (en) | 2015-06-24 |
| CN104732905B true CN104732905B (en) | 2018-02-06 |
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ID=53456758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310721941.XA Active CN104732905B (en) | 2013-12-24 | 2013-12-24 | Transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104732905B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5345121A (en) * | 1992-02-27 | 1994-09-06 | Fujitsu Limited | Differential amplification circuit |
| CN101436855A (en) * | 2007-11-13 | 2009-05-20 | 奇景光电股份有限公司 | Level shift circuit and method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6414534B1 (en) * | 2001-02-20 | 2002-07-02 | Taiwan Semiconductor Manufacturing Company | Level shifter for ultra-deep submicron CMOS designs |
| CN101866580B (en) * | 2010-06-21 | 2011-11-16 | 旭曜科技股份有限公司 | Transformer |
-
2013
- 2013-12-24 CN CN201310721941.XA patent/CN104732905B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5345121A (en) * | 1992-02-27 | 1994-09-06 | Fujitsu Limited | Differential amplification circuit |
| CN101436855A (en) * | 2007-11-13 | 2009-05-20 | 奇景光电股份有限公司 | Level shift circuit and method thereof |
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| Publication number | Publication date |
|---|---|
| CN104732905A (en) | 2015-06-24 |
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