CN108063615A - Level switching circuit based on digital signal clamp - Google Patents
Level switching circuit based on digital signal clamp Download PDFInfo
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- CN108063615A CN108063615A CN201711316670.4A CN201711316670A CN108063615A CN 108063615 A CN108063615 A CN 108063615A CN 201711316670 A CN201711316670 A CN 201711316670A CN 108063615 A CN108063615 A CN 108063615A
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- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052732 germanium Inorganic materials 0.000 description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/02—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components
- H03K19/08—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using semiconductor devices
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Abstract
The present disclosure provides a level shift circuit based on digital signal clamping, comprising: a power input terminal for providing a power input VCC; the signal input end is used for providing a signal interface which needs level conversion; a first resistor R1 having a first end connected to the signal input; a signal output terminal connected to a second terminal of the first resistor R1; a second resistor R2 having a first terminal connected to the power input terminal; a first triode Q1, the collector of which is connected to the second end of the resistor R1, the base of which is connected to the second end of the resistor R2, and the emitter of which is grounded; a second triode Q2, the collector and the base of which are both connected to the second end of the resistor R2, and the emitter of which is grounded; the first triode Q1 and the second triode Q2 are two bipolar junction type triodes with symmetric parameters, form a mirror current source circuit, and simultaneously meet the requirements of converting a high level signal into a low level signal and removing a direct current component from a signal containing the direct current component.
Description
Technical field
This disclosure relates to level shifting circuit field more particularly to a kind of level conversion electricity based on digital signal clamper
Road.
Background technology
There is level conversion when being communicated in different digital signal, when existing varying level signal is communicated,
Triode is needed to convert or by dedicated devices (electrical level transferring chip)；And number or simulation letter containing DC component
Number, remove DC component by high-pass filter, diode clamping circuit or dedicated devices.And for not high to semaphore request
Signal, it is higher with dedicated devices processing cost, it appears to waste one's talent on a petty job；If DC component is removed with diode clamping circuit
It goes, it is necessary to add one and the opposite polarity power supply of DC component, for example usual signal is all positive value, then need addition one
Negative value power supply, such cost and PCB space can all become larger；If the high-pass filter being barricaded as with capacitance resistance, since capacitance fills
Discharge process, causing the rise/fall of signal, this kind of processing mode is only applicable to low speed signal along slack-off, for rate compared with
High signal can not then be handled；And another processing scheme is to pass to resistance on signal wire to be connected to triode (NPN type)
Base stage, the transmitter ground connection of triode, collector pull-up is connected to and needs to be converted on the power supply of signal level.Though such scheme
It is so feasible, but be only capable of high level signal changing into low level signal, for removing the DC component containing DC component signal
It is then helpless.
For the disadvantages mentioned above of existing processing mode, it can meet high level simultaneously there is an urgent need for one kind and change to low level signal
With the level shifting circuit of DC component will be removed containing the signal of DC component, and meet preferable practicability and relatively low
Cost.
Disclosure
(1) technical problems to be solved
It is mentioned above at least partly to solve present disclose provides a kind of level shifting circuit based on digital signal clamper
The technical issues of going out.
(2) technical solution
According to one aspect of the disclosure, a kind of level shifting circuit based on digital signal clamper is provided, including：Electricity
Source input terminal, for providing power input VCC；Signal input part, for providing the signaling interface for needing to carry out level conversion；The
One resistance R1, first end are connected to the signal input part；Signal output part is connected to the second end of first resistor R1, uses
In the transformed level of output；Second resistance R2, first end are connected to power input；First triode Q1, collector
The second end of the resistance R1 is connected to, base stage is connected to the second end of the resistance R2, emitter ground connection；Second triode
Q2, collector are all connected to the second end of the resistance R2, emitter ground connection with base stage；Wherein, the first triode Q1
It is the symmetrical dipole triode of two parameters with the second triode Q2, forms image current source circuit.
In the disclosure some embodiments, the level shifting circuit passes through power input voltage VCC Regulate signals and turns
Change level.
In the disclosure some embodiments, first resistor R1 is identical with the resistance value of second resistance R2.
In the disclosure some embodiments, DC component voltage that power input voltage VCC is filtered out with input signal needs
Meet：
UInput signal DC component=VCC-UBE2
Wherein, UInput signal DC componentFor the DC component voltage that filters out of input signal needs, VCC is supply voltage, UBE2For
Two triode Q2 base stages and emitter voltage are poor.
In the disclosure some embodiments, DC component voltage that power input voltage VCC is filtered out with input signal needs
It needs to meet：
UInput signal DC component=R1* (VCC-UBE2)/R2
Wherein, UInput signal DC componentFor the DC component voltage that input signal needs filter out, VCC is supply voltage, and R1, R2 divide
Not Wei first resistor R1 and second resistance R2 resistance value, UBE2It is poor for the second triode Q2 base stages and emitter voltage.
In the disclosure some embodiments, power input is regulated power supply.
In the disclosure some embodiments, converted by the ratio Regulate signal for adjusting first resistor R1 and second resistance R2
Level.
In the disclosure some embodiments, DC component voltage that power input voltage VCC is filtered out with input signal needs
It needs to meet：
R1/R2=UInput signal DC component/(VCC-UBE2)
Wherein, UInput signal DC componentFor the DC component voltage that input signal needs filter out, VCC is supply voltage, and R1, R2 divide
Not Wei first resistor R1 and second resistance R2 resistance value, UBE2It is poor for the second triode Q2 base stages and emitter voltage.
In the disclosure some embodiments, R1 and/or R2 are adjustable resistance.
In the disclosure some embodiments, the first triode Q1, the second triode Q2 replace with two identical electromagnetism every
Off-chip piece.
(3) advantageous effect
It can be seen from the above technical proposal that level shifting circuit of the disclosure based on digital signal clamper at least have with
Lower advantageous effect：
By using the operation principle of mirror current source, level shifting circuit is dexterously constituted, while is met height
Level to low level signal changes and removes the signal containing DC component the demand of DC component.
Description of the drawings
Fig. 1 is the circuit structure diagram of level shifting circuit of the embodiment of the present disclosure based on digital signal clamper.
Specific embodiment
Present disclose provides a kind of level shifting circuit based on digital signal clamper, the mirror image electricity being barricaded as using triode
Stream source forms and meets the electricity that high level changes to low level signal and the signal containing DC component is removed to DC component simultaneously
Flat conversion circuit.
Purpose, technical scheme and advantage to make the disclosure are more clearly understood, below in conjunction with specific embodiment, and reference
The disclosure is further described in attached drawing.
Disclosure some embodiments will be done with reference to appended attached drawing in rear and more comprehensively describe to property, some of but not complete
The embodiment in portion will be illustrated.In fact, the various embodiments of the disclosure can be realized in many different forms, and should not be construed
To be limited to this several illustrated embodiment；Relatively, these embodiments are provided so that the disclosure meets applicable legal requirement.
In first exemplary embodiment of the disclosure, a kind of level conversion electricity based on digital signal clamper is provided
Road.Fig. 1 is the structure diagram of level shifting circuit of the first embodiment of the present disclosure based on digital signal clamper.As shown in Figure 1,
Level shifting circuit of the disclosure based on digital signal clamper includes：Power input VCC, signal input part, signal output part,
Resistance R1, R2, triode Q1, Q2.
Each component of level shifting circuit of the present embodiment based on digital signal clamper is carried out individually below detailed
Thin description.
Power input, for providing power supply VCC inputs；
Signal input part, for providing the signaling interface for needing to carry out level conversion；
First resistor R1, first end are connected to the signal input part, and second end is connected to signal output part；
Signal output part is connected to the second end of first resistor R1, for exporting transformed level；
Second resistance R2, first end are connected to power input；
First triode Q1, collector are connected to the second end of the resistance R1, and base stage is connected to the resistance R2's
Second end, emitter ground connection；
Second triode Q2, collector are connected to the second end of the resistance R2, and base stage is connected similarly to the resistance
The second end of R2, emitter ground connection.
From said structure, the level shifting circuit based on digital signal clamper is symmetrically bipolar by two parameters
Junction type transistor base docks, wherein second triode is connected into the form of diode, the collection of second triode
Electrode accesses power supply VCC by second resistance R2, and the collector of the second triode connects signal output part.Due to output current and electricity
The electric current of source branch is basically identical, and circuit structure almost symmetry, therefore forms mirror current source.
Fig. 1 is the circuit structure diagram of level shifting circuit of the embodiment of the present disclosure based on digital signal clamper.Such as Fig. 1 institutes
Show, the signal that the signal imitation needs sent using signal generator XFG1 are converted；R1 first ends are shown using oscillograph XSC1
Voltage-to-ground and second end voltage-to-ground.Wherein, supply voltage VCC；The electric current flowed through on second resistance R2 is IREF,
The electric current flowed through on first triode Q1 collectors is IC1, the electric current flowed through on the second triode Q2 collectors is IC2, the one or three
The electric current flowed through in pole pipe Q1 base stages is IB1, the electric current flowed through in the second triode Q2 base stages is IB2；First triode Q1 base stages
It is U with emitter voltage differenceBE1, the second triode Q2 base stages are U with emitter voltage differenceBE2, therefore can draw：
IREF=(VCC-UBE2)/R2；
IC1=IREF-IB1-IB2
From mirror current source principle, the base current very little of two triodes can be ignored, therefore IC1With IREFIt is several
Identical, i.e., the electric current by second resistance R2 and first resistor R1 is almost identical, so as R1=R2, if R1 and R2 resistances
Value is the same, then the pressure drop U of R1R1With the pressure drop U of R2R2Also it is about the same, wherein：
UR2=VCC-UBE2
If power supply VCC is 12.2V, Q1, Q2 are germanium tube, then the base stage of Q1, Q2 and the voltage difference U of emitterBE2For
0.2V, then：
UR2=12.2-0.2 (V)
The 12.2V that i.e. voltage of second resistance R2 is power supply VCC subtracts the base stage of diode and emitter voltage UBE20.2V
That is 12V, due to R1=R2, then R1 is as the pressure drop of R2, i.e., the voltage of R1 is also 12V.
Assuming that it is 0V, high level 15.3V that the signal that signal generator XFG1 is sent, which is low level, then this signal is by R1
The collector that level afterwards is low level Q1 (understands collector and emitter with emitter voltage by looking into specific triode model
Voltage), the voltage (12V) that high level (15.3V) subtracts R1 obtains 3.3V, so just removes DC component, obtaining low level is
Collector and emitter voltage, high level are the signal of 3.3V.
In other words, in the case where first resistor R1, second resistance R2 resistance values are the same (base current can be neglected), mirror image
The voltage of current source is how many, then signal will be fallen mirror current source voltage VCC by partial pressure and subtract the second triode Q2 base stages and send out
The voltage difference U of emitter voltageBE2, so the voltage VCC of current source is necessary to ensure that adds the two or three pole for signal DC component voltage
The voltage difference U of pipe Q2 base stages and emitterBE2, just can ensure that the DC component of signal can divide by first resistor R1, i.e.,：
VCC=UInput signal DC component+UBE2
It needs to set power supply according to above formula in circuit build process, otherwise the DC component of the too small then signal of voltage can not
All partial pressure is fallen.
In the above-described embodiments, the first resistor R1 is identical with the resistance value of second resistance R2, in various embodiments,
If input is high level signal, R1 is again may be by divide the voltage of signal, according to the DC component of input signal
UInput signal DC componentFormula：
UInput signal DC component=R1*IC1
=R1*IREF
=R1* (VCC-UBE2)/R2
From above formula, according to the size for the DC component for needing to filter out in input signal, by adjusting mirror current source
Voltage VCC or first resistor R1 and second resistance R2 ratio, such as can be divided by tuning up the resistance value of R1, can be with
Obtain the output signal of varying level.
In general, the mirror current source being barricaded as by triode, is for providing accurately static working current to amplifying circuit
, and in the present invention, level shifting circuit is constituted using its operation principle, while met high level to low level
Signal changes and removes the signal containing DC component the demand of DC component.
So far, the introduction of first embodiment of the present disclosure level shifting circuit finishes.
So far, attached drawing is had been combined the embodiment of the present disclosure is described in detail.It should be noted that it in attached drawing or says
In bright book text, the realization method that does not illustrate or describe is form known to a person of ordinary skill in the art in technical field, and
It is not described in detail.In addition, the above-mentioned definition to each element and method be not limited in mentioning in embodiment it is various specific
Structure, shape or mode, those of ordinary skill in the art simply can be changed or replaced to it, such as：
Two types may be employed silicone tube by triode Q1, Q2 of germanium tube and replace；
Symmetrical dipole triode Q1, the Q2 of two parameters can be replaced with two identical electromagnetic isolation chips.
According to above description, those skilled in the art should be to level shifting circuit of the disclosure based on digital signal clamper
There is clear understanding.
Unless there are known entitled phase otherwise meaning, the numerical parameter in this specification and appended claims are approximations, energy
Enough required characteristic changings according to as obtained by content of this disclosure.Specifically, it is all to be used in specification and claim
The number of the middle content for representing composition, reaction condition etc., it is thus understood that be that the term of " about " is subject to be repaiied in all situations
Decorations.Under normal circumstances, the meaning of expression refers to include by specific quantity ± 10% variation in some embodiments, at some
± 5% variation in embodiment, ± 1% variation in some embodiments, in some embodiments ± 0.5% variation.
Furthermore word "comprising" does not exclude the presence of element or step not listed in the claims.Before element
Word "a" or "an" does not exclude the presence of multiple such elements.
Specification and the word of ordinal number such as " first ", " second ", " the 3rd " etc. used in claim, with modification
Corresponding element, itself is not meant to that the element has any ordinal number, does not also represent the suitable of a certain element and another element
Order in sequence or manufacturing method, the use of those ordinal numbers are only used for enabling the element with certain name and another tool
The element for having identical name can make clear differentiation.
Those skilled in the art, which are appreciated that, to carry out adaptively the module in the equipment in embodiment
Change and they are arranged in one or more equipment different from the embodiment.It can be the module or list in embodiment
Member or component be combined into a module or unit or component and can be divided into addition multiple submodule or subelement or
Sub-component.In addition at least some in such feature and/or process or unit exclude each other, it may be employed any
Combination is disclosed to all features disclosed in this specification (including adjoint claim, summary and attached drawing) and so to appoint
Where all processes or unit of method or equipment are combined.Unless expressly stated otherwise, this specification is (including adjoint power
Profit requirement, summary and attached drawing) disclosed in each feature can be by providing the alternative features of identical, equivalent or similar purpose come generation
It replaces.If also, in the unit claim for listing equipment for drying, several in these devices can be by same hard
Part item embodies.
Similarly, it should be understood that in order to simplify the disclosure and help to understand one or more of each open aspect,
Above in the description of the exemplary embodiment of the disclosure, each feature of the disclosure is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the method for the disclosure should be construed to reflect following intention：I.e. required guarantor
The disclosure of shield requires features more more than the feature being expressly recited in each claim.It is more precisely, such as following
Claims reflect as, open aspect is all features less than single embodiment disclosed above.Therefore,
Thus the claims for following specific embodiment are expressly incorporated in the specific embodiment, wherein each claim is in itself
Separate embodiments all as the disclosure.
Particular embodiments described above has carried out the purpose, technical solution and advantageous effect of the disclosure further in detail
It describes in detail bright, it should be understood that the foregoing is merely the specific embodiments of the disclosure, is not limited to the disclosure, it is all
Within the spirit and principle of the disclosure, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the disclosure
Within the scope of shield.
Claims (10)
1. a kind of level shifting circuit based on digital signal clamper, including：
Power input, for providing power input VCC；
Signal input part, for providing the signaling interface for needing to carry out level conversion；
First resistor R1, first end are connected to the signal input part；
Signal output part is connected to the second end of first resistor R1, for exporting transformed level；
Second resistance R2, first end are connected to power input；
First triode Q1, collector are connected to the second end of the resistance R1, and base stage is connected to the second of the resistance R2
End, emitter ground connection；
Second triode Q2, collector are all connected to the second end of the resistance R2, emitter ground connection with base stage；
Wherein, the first triode Q1 and the second triode Q2 is the symmetrical dipole triode of two parameters, forms mirror
Image current source circuit.
2. level shifting circuit according to claim 1, wherein, electricity is converted by power input voltage VCC Regulate signals
It is flat.
3. level shifting circuit according to claim 2, wherein, first resistor R1 is identical with the resistance value of second resistance R2.
4. level shifting circuit according to claim 3, wherein, power input voltage VCC is filtered out with input signal needs
DC component voltage meet：
UInput signal DC component=VCC-UBE2
Wherein, UInput signal DC componentFor the DC component voltage that filters out of input signal needs, VCC is supply voltage, UBE2For the two or three
Grade pipe Q2 base stages and emitter voltage are poor.
5. level shifting circuit according to claim 2, wherein, power input voltage VCC is filtered out with input signal needs
DC component voltage need to meet：
UInput signal DC component=R1* (VCC-UBE2)/R2
Wherein, UInput signal DC componentFor the DC component voltage that input signal needs filter out, VCC is supply voltage, and R1, R2 are respectively
The resistance value of first resistor R1 and second resistance R2, UBE2It is poor for the second triode Q2 base stages and emitter voltage.
6. level shifting circuit according to claim 2, wherein, power input is regulated power supply.
7. level shifting circuit according to claim 1, wherein, by the ratio for adjusting first resistor R1 and second resistance R2
It is worth Regulate signal switching levels.
8. level shifting circuit according to claim 7, wherein, power input voltage VCC is filtered out with input signal needs
DC component voltage need to meet：
R1/R2=UInput signal DC component/(VCC-UBE2)
Wherein, UInput signal DC componentFor the DC component voltage that input signal needs filter out, VCC is supply voltage, and R1, R2 are respectively
The resistance value of first resistor R1 and second resistance R2, UBE2It is poor for the second triode Q2 base stages and emitter voltage.
9. level shifting circuit according to claim 7, wherein, R1 and/or R2 are adjustable resistance.
10. level shifting circuit according to claim 1, wherein, the first triode Q1, the second triode Q2 replace with two
A identical electromagnetic isolation chip.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711316670.4A CN108063615A (en) | 2017-12-12 | 2017-12-12 | Level switching circuit based on digital signal clamp |
| PCT/CN2018/083926 WO2019114169A1 (en) | 2017-12-12 | 2018-04-20 | Level shift circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711316670.4A CN108063615A (en) | 2017-12-12 | 2017-12-12 | Level switching circuit based on digital signal clamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108063615A true CN108063615A (en) | 2018-05-22 |
Family
ID=62138233
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711316670.4A Pending CN108063615A (en) | 2017-12-12 | 2017-12-12 | Level switching circuit based on digital signal clamp |
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| Country | Link |
|---|---|
| CN (1) | CN108063615A (en) |
| WO (1) | WO2019114169A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008129977A (en) * | 2006-11-24 | 2008-06-05 | Yokogawa Electric Corp | Voltage shift circuit |
| CN102447248A (en) * | 2010-10-12 | 2012-05-09 | 上海华虹Nec电子有限公司 | Pull-down current input output circuit |
| CN103532538A (en) * | 2012-07-05 | 2014-01-22 | 意法半导体研发（上海）有限公司 | Level shift circuit used for high-voltage application |
| CN103716037A (en) * | 2013-12-17 | 2014-04-09 | 深圳市新国都技术股份有限公司 | Bidirectional electrical level conversion circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004104683A (en) * | 2002-09-12 | 2004-04-02 | Toppoly Optoelectronics Corp | Voltage level switching device |
| CN102255494B (en) * | 2011-04-13 | 2013-09-25 | 西安电子科技大学 | Level shift circuit for suppressing noises |
| CN207612254U (en) * | 2017-12-12 | 2018-07-13 | 北京嘉楠捷思信息技术有限公司 | Level switching circuit based on digital signal clamp |
-
2017
- 2017-12-12 CN CN201711316670.4A patent/CN108063615A/en active Pending
-
2018
- 2018-04-20 WO PCT/CN2018/083926 patent/WO2019114169A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008129977A (en) * | 2006-11-24 | 2008-06-05 | Yokogawa Electric Corp | Voltage shift circuit |
| CN102447248A (en) * | 2010-10-12 | 2012-05-09 | 上海华虹Nec电子有限公司 | Pull-down current input output circuit |
| CN103532538A (en) * | 2012-07-05 | 2014-01-22 | 意法半导体研发（上海）有限公司 | Level shift circuit used for high-voltage application |
| CN103716037A (en) * | 2013-12-17 | 2014-04-09 | 深圳市新国都技术股份有限公司 | Bidirectional electrical level conversion circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019114169A1 (en) | 2019-06-20 |
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Application publication date: 20180522 |