CN108809080A - A kind of biasing circuit, oscillator and charge pump - Google Patents
A kind of biasing circuit, oscillator and charge pump Download PDFInfo
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- CN108809080A CN108809080A CN201710297563.5A CN201710297563A CN108809080A CN 108809080 A CN108809080 A CN 108809080A CN 201710297563 A CN201710297563 A CN 201710297563A CN 108809080 A CN108809080 A CN 108809080A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
A kind of biasing circuit of offer of the embodiment of the present invention, oscillator and charge pump, biasing circuit includes the first current mirror module and the second current mirror module, biasing circuit further include：Diverter module, diverter module is connected with the Enable Pin of the output end of the first current mirror module, the input terminal of the second current mirror module and oscillator respectively, when the enable signal amplitude of oscillator is greater than or equal to preset value, the output current of diverter module pair the first current mirror module shunts, and the electric current after output steering is to the second current mirror module；Wherein, the enable signal amplitude of the electric current after shunting and oscillator is inversely proportional.In the case where the reference current (i.e. the output current of the first current mirror module) of biasing circuit is constant, when the enable signal amplitude (i.e. the mains voltage variations of charge pump) of oscillator is greater than or equal to preset value, it is constant that the embodiment of the present invention can keep charge pump to provide charge capability.
Description
Technical field
The present invention relates to field of circuit technology, more particularly to a kind of biasing circuit, a kind of oscillator and a kind of charge pump.
Background technology
The ability of charge pump, that is, charge pump provide the ability of charge to load, with the clock frequency of charge pump and when
Clock amplitude has relationship.Fig. 1 is the electrical block diagram of conventional charge pump, and Fig. 2 is the clocked sequential schematic diagram of conventional charge pump.
Before the collapse point that clock frequency reaches conventional charge pump, i.e., capacitance can not in clock frequency does not pump far more than conventional charge
In the case of the frequency values for transmitting charge, clock clk/clkb is bigger, and clock amplitude VDD is higher, then conventional charge pump provides
Charge capability is stronger.
However, when conventional charge pump is applied to memory, in the case of being typically used in wide power voltage, that is, pass
The supply voltage of system charge pump can change in the range of 1VDD~3VDD.At this point, if the reference current of conventional charge pump is given,
I.e. when the oscillator of conventional charge pump can not adjust reference current, the ability that conventional charge pump provides charge will be with supply voltage
Variation and change.
Invention content
In view of the above problems, the embodiment of the present invention is designed to provide a kind of biasing circuit, a kind of oscillator and one kind
Charge pump, to solve when the oscillator that conventional charge pumps can not adjust reference current, conventional charge pump provides the ability of charge
The problem of changing with the variation of supply voltage.
To solve the above-mentioned problems, the embodiment of the invention discloses a kind of biasing circuits, are applied to oscillator, the biasing
Circuit includes the first current mirror module and the second current mirror module, the biasing circuit further include：Diverter module, described point
Flow module respectively with the output end of the first current mirror module, the second current mirror module input terminal and described shake
The Enable Pin for swinging device is connected, when the enable signal amplitude of the oscillator is greater than or equal to preset value, the diverter module pair
The output current of the first current mirror module is shunted, and the electric current after output steering is to the second current mirror mould
Block；Wherein, the enable signal amplitude of the electric current after the shunting and the oscillator is inversely proportional.
Optionally, the diverter module includes：First current branch, first current branch are electric with described first respectively
The output end of traffic mirroring module is connected with the Enable Pin of the oscillator；The resistance value of first current branch and the oscillator
Enable signal amplitude it is inversely proportional；Second current branch, second current branch respectively with the first current mirror mould
The output end of block is connected with the input terminal of the second current mirror module；Be more than when the enable signal amplitude of the oscillator or
When equal to the preset value, first current branch and second current branch conductive；When the enabled letter of the oscillator
When number amplitude is less than the preset value, first current branch disconnects, second current branch conductive.
Optionally, first current branch includes：First NMOS tube, the drain terminal of first NMOS tube and described first
The output end of current mirror module is connected, and the control terminal of first NMOS tube is connected with the Enable Pin of the oscillator；At least
One the second NMOS tube, at least one second NMOS tube are connected in parallel, the drain terminal and control terminal point of second NMOS tube
It is not connected with the source of first NMOS tube, the source ground connection of second NMOS tube.
Optionally, the equivalent resistance of first NMOS tube and the enable signal amplitude of the oscillator are inversely proportional.
Optionally, second current branch includes：Third NMOS tube, the drain terminal of the third NMOS tube and described first
The output end of current mirror module is connected, the input terminal of the control terminal of the third NMOS tube and the second current mirror module
It is connected, the source ground connection of the third NMOS tube.
Optionally, the ruler of the size of first NMOS tube, the size and the third NMOS tube of second NMOS tube
It is very little identical.
To solve the above-mentioned problems, the embodiment of the invention also discloses a kind of oscillators, including the biasing circuit.
To solve the above-mentioned problems, the embodiment of the invention also discloses a kind of charge pumps, including the oscillator.
The embodiment of the present invention includes following advantages：By the way that diverter module is arranged in biasing circuit, diverter module is distinguished
With the Enable Pin of the output end of the first current mirror module in biasing circuit, the input terminal and oscillator of the second current mirror module
It is connected, when the enable signal amplitude of oscillator is greater than or equal to preset value, makes diverter module pair the first current mirror module
Output current is shunted, and the electric current after output steering is to the second current mirror module, wherein the electric current after shunting and oscillation
The enable signal amplitude of device is inversely proportional.In this way, in reference current (i.e. the first current mirror module of biasing circuit (oscillator)
Output current) it is constant in the case of, be more than when the enable signal amplitude (i.e. the mains voltage variations of charge pump) of oscillator or
When equal to preset value, due to the inversely proportional variation of enable signal amplitude of electric current and oscillator that biasing circuit provides so that shake
When swinging that i.e. supply voltage is got higher when the enable signal amplitude of device becomes larger, the electric current that biasing circuit provides becomes smaller, the clock of oscillator
When frequency becomes smaller and the enable signal amplitude of oscillator becomes that i.e. supply voltage is lower hour, the electric current that biasing circuit provides becomes
Greatly, the clock frequency of oscillator becomes larger, and the mains voltage variations to counteract charge pump provide charge capability to charge pump
It influences, keeps charge pump to provide charge capability constant.
Description of the drawings
Fig. 1 is the electrical block diagram of conventional charge pump；
Fig. 2 is the clocked sequential schematic diagram of conventional charge pump；
Fig. 3 is a kind of structure diagram of biasing circuit embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of biasing circuit embodiment of the present invention.
Specific implementation mode
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
With reference to Fig. 3, show that a kind of structure diagram of biasing circuit embodiment of the present invention, the biasing circuit are applied to shake
Device is swung, which may include the first current mirror module 10, the second current mirror module 20 and diverter module 30, shunting
Module 30 respectively with the output end of the first current mirror module 10, the second input terminal of current mirror module 20 and making for oscillator
Energy end is connected, and the Enable Pin of oscillator provides enable signal EN, is preset when the enable signal EN amplitudes of oscillator are greater than or equal to
When value, diverter module 30 shunts the output current of the first current mirror module 10, and the electric current after output steering is to
Two current mirror modules 20；Wherein, the enable signal EN amplitudes of the electric current after shunting and oscillator are inversely proportional.
Wherein, preset value can be configured according to the mains voltage variations range of charge pump.
In this way, the reference current (i.e. the output current of the first current mirror module 10) in biasing circuit (oscillator) is constant
In the case of, when the enable signal EN amplitudes (i.e. the mains voltage variations of charge pump) of oscillator are greater than or equal to preset value,
Due to the inversely proportional variation of enable signal EN amplitudes of electric current and oscillator that biasing circuit provides so that the enabled letter of oscillator
When i.e. supply voltage is got higher when number EN amplitudes become larger, the electric current that biasing circuit provides becomes smaller, and the clock frequency of oscillator becomes smaller, with
And the enable signal EN amplitudes of oscillator become hour, that is, supply voltage when being lower, the electric current that biasing circuit provides becomes larger, oscillator
Clock frequency become larger, the influence of charge capability is provided to counteract the mains voltage variations of charge pump to charge pump, is realized
Charge pump is kept to provide charge capability constant.
It should be noted that with reference to Fig. 3, it includes the first current mirror module 10, the second current mirror mould that biasing circuit, which removes,
Can also include bias current generation module 40 outside block 20 and diverter module 30.Wherein, bias current generation module 40 is for producing
Raw bias current；First current mirror module 10, the first current mirror module 10 are arranged with 40 mirror image of bias current generation module,
First current mirror module 10 is used for mirror image bias current；Second current mirror module 20, the second current mirror module 20 with point
30 mirror image of flow module is arranged, and the second current mirror module 20 is for the electric current after mirror image shunting.
Optionally, in one embodiment of the invention, with reference to Fig. 4, diverter module 30 may include：First current branch
31, the first current branch 31 is connected with the Enable Pin of the output end of the first current mirror module 10 and oscillator respectively；First electricity
The enable signal EN amplitudes of the resistance value and oscillator that flow branch 31 are inversely proportional；Second current branch 32, the second current branch 32
It is connected respectively with the input terminal of the output end of the first current mirror module 10 and the second current mirror module 20；When making for oscillator
When energy signal EN amplitudes are greater than or equal to preset value, the first current branch 31 and the conducting of the second current branch 32, the first electric current branch
Road 31 and the second current branch 32 shunt the output current of the first current mirror module 10；When the enable signal of oscillator
When EN amplitudes are less than preset value, the first current branch 31 disconnects, the conducting of the second current branch 32, the first current mirror module 10
Output current is only flowed through from the second current branch 32.
Optionally, in one embodiment of the invention, with reference to Fig. 4, the first current branch 31 may include：First NMOS
Pipe N1, the drain terminal of the first NMOS tube N1 are connected with the output end of the first current mirror module 10, the control terminal of the first NMOS tube N1
It is connected with the Enable Pin of oscillator；At least one second NMOS tube N2, at least one (one or more) second NMOS tube N2 is simultaneously
Connection connection, the drain terminal and control terminal of the second NMOS tube N2 are connected with the source of the first NMOS tube N1 respectively, the second NMOS tube N2's
Source is grounded.
Optionally, the equivalent resistance of the first NMOS tube N1 can be inversely proportional with the enable signal EN amplitudes of oscillator.Tool
Body, the equivalent resistance of the first NMOS tube N1 may be directly proportional to 1/ [K* (VDD-Vth)], wherein K is constant, and VDD is oscillator
Enable signal EN amplitudes, Vth be the first NMOS tube N1 threshold voltage.Therefore, the equivalent resistance of the first NMOS tube N1 can be with
It is inversely proportional with the enable signal EN amplitudes of oscillator.In this way, when the enable signal EN amplitudes of oscillator become larger, the first NMOS
The equivalent resistance of pipe N1 becomes smaller, and the electric current for flowing through the first current branch 31 becomes larger, and when the enable signal EN amplitudes of oscillator
Become hour, the equivalent resistance of the first NMOS tube N1 becomes larger, and the electric current for flowing through the first current branch 31 becomes smaller.Specifically, Ke Yishe
The threshold voltage for setting preset value and the first NMOS tube N1 is equal.
Optionally, in one embodiment of the invention, with reference to Fig. 4, the second current branch 32 may include：3rd NMOS
Pipe N3, the drain terminal of third NMOS tube N3 are connected with the output end of the first current mirror module 10, the control terminal of third NMOS tube N3
It is connected with the input terminal of the second current mirror module 20, the source ground connection of third NMOS tube N3.
Optionally, in one embodiment of the invention, the size of the first NMOS tube N1, the size of the second NMOS tube N2 and
The size of third NMOS tube N3 can be identical, convenient for calculating the electric current after shunting.
In Fig. 4, the number of the second NMOS tube N2 can be 5, and the operation principle of biasing circuit shown in Fig. 4 is as follows：PMOS
Pipe P0, PMOS tube P1, NMOS tube N0, NMOS tube N4 and resistance R0 composition bias currents generation module 40, PMOS tube P2, PMOS tube
P3 forms the first current mirror module 10, and PMOS tube P4, PMOS tube P5, NMOS tube N5 and NMOS tube N6 form the second current mirror
Module 20, ENB are the enabled inverted signal of oscillator, and V_REF1 and V_REF2 are two bias voltages that biasing circuit provides.Its
In, m indicates the number of corresponding metal-oxide-semiconductor, for example, the m=1 of PMOS tube P3 indicates that the number of corresponding PMOS tube P3 is 1, NMOS tube
The m=5 of N2 indicates that the number of NMOS tube N2 is 5.It is entire to bias when the enable signal EN amplitudes EN of oscillator becomes 1 from 0
Circuit is started to work, and bias current generation module 40 provides fixed bias current I0=(VBG-Vt)/R0, and VBG is band-gap reference
Fixed voltage, Vt is the threshold voltage of NMOS tube N4, and R0 is the resistance value of resistance R0.Bias current I0 by PMOS tube P1 and
PMOS tube P3, by 1:1 mirroring ratios are transferred to PMOS tube P3.
When the enable signal EN amplitudes (supply voltage of charge pump) of oscillator are less than preset value, although EN is 1, due to
The threshold voltage of first NMOS tube N1 is relatively high, the bias current I0 flow down from PMOS tube P3 the second electric currents of substantially all inflow
Branch, the electric current for being finally mirrored to NMOS tube N5 are also bias current I0；If the enable signal EN amplitude (charge pumps of oscillator
Supply voltage) be greater than or equal to preset value when, i.e., the enable signal EN amplitudes of oscillator be more than the first NMOS tube N1 threshold value
Voltage, then the first NMOS tube N1 is fully on, the first current branch 31 meeting shunt bias electric current I0 so that flow through the second electric current
The electric current of branch 32 is I0/6 or so.The electric current for being so mirrored to NMOS tube N5 is I0/6 or so, and the clock frequency of oscillator will
It substantially reduces.
The biasing circuit of the embodiment of the present invention includes following advantages：It (can be with by the way that diverter module is arranged in biasing circuit
Including the first current branch and the second current branch), by diverter module respectively with the first current mirror module in biasing circuit
Output end, the second current mirror module input terminal be connected with the Enable Pin of oscillator, when the enable signal amplitude of oscillator is big
When preset value, the output current of diverter module pair the first current mirror module is set to shunt, and after output steering
Electric current to the second current mirror module, wherein the enable signal amplitude of electric current and oscillator after shunting is inversely proportional.This
Sample, in the case where the reference current (i.e. the output current of the first current mirror module) of biasing circuit (oscillator) is constant, when
When the enable signal amplitude (i.e. the mains voltage variations of charge pump) of oscillator is greater than or equal to preset value, since biasing circuit carries
The inversely proportional variation of enable signal amplitude of the electric current and oscillator of confession so that i.e. electric when the enable signal amplitude of oscillator becomes larger
When source voltage is got higher, the electric current that biasing circuit provides becomes smaller, and the clock frequency of oscillator becomes smaller and the enable signal of oscillator
When amplitude change hour, that is, supply voltage is lower, the electric current that biasing circuit provides becomes larger, and the clock frequency of oscillator becomes larger, to support
The mains voltage variations for the charge pump that disappeared provide charge pump the influence of charge capability, keep charge pump to provide charge capability permanent
It is fixed.
The embodiment of the invention also discloses a kind of oscillators, including above-mentioned biasing circuit.
The oscillator of the embodiment of the present invention includes following advantages：By the way that diverter module is arranged in the biasing circuit of oscillator
(may include the first current branch and the second current branch), by diverter module respectively with the first current mirror mould in biasing circuit
The output end of block, the second current mirror module input terminal be connected with the Enable Pin of oscillator, when the enable signal width of oscillator
When value is greater than or equal to preset value, the output current of diverter module pair the first current mirror module is made to shunt, and exports and divide
Electric current after stream is to the second current mirror module, wherein the enable signal amplitude of electric current and oscillator after shunting is inversely proportional.
In this way, in the case where the reference current (i.e. the output current of the first current mirror module) of biasing circuit (oscillator) is constant,
When the enable signal amplitude (i.e. the mains voltage variations of charge pump) of oscillator is greater than or equal to preset value, due to biasing circuit
The inversely proportional variation of enable signal amplitude of the electric current and oscillator of offer so that when the enable signal amplitude of oscillator becomes larger i.e.
When supply voltage is got higher, the electric current that biasing circuit provides becomes smaller, and the clock frequency of oscillator becomes smaller and the enabled letter of oscillator
When number amplitude becomes hour, that is, supply voltage and is lower, the electric current that biasing circuit provides becomes larger, and the clock frequency of oscillator becomes larger, to
The mains voltage variations for counteracting charge pump provide charge pump the influence of charge capability, keep charge pump to provide charge capability permanent
It is fixed.
The embodiment of the invention also discloses a kind of charge pumps, including above-mentioned oscillator.
The charge pump of the embodiment of the present invention includes following advantages：By the way that diverter module is arranged in the biasing circuit of oscillator
(may include the first current branch and the second current branch), by diverter module respectively with the first current mirror mould in biasing circuit
The output end of block, the second current mirror module input terminal be connected with the Enable Pin of oscillator, when the enable signal width of oscillator
When value is greater than or equal to preset value, the output current of diverter module pair the first current mirror module is made to shunt, and exports and divide
Electric current after stream is to the second current mirror module, wherein the enable signal amplitude of electric current and oscillator after shunting is inversely proportional.
In this way, in the case where the reference current (i.e. the output current of the first current mirror module) of biasing circuit (oscillator) is constant,
When the enable signal amplitude (i.e. the mains voltage variations of charge pump) of oscillator is greater than or equal to preset value, due to biasing circuit
The inversely proportional variation of enable signal amplitude of the electric current and oscillator of offer so that when the enable signal amplitude of oscillator becomes larger i.e.
When supply voltage is got higher, the electric current that biasing circuit provides becomes smaller, and the clock frequency of oscillator becomes smaller and the enabled letter of oscillator
When number amplitude becomes hour, that is, supply voltage and is lower, the electric current that biasing circuit provides becomes larger, and the clock frequency of oscillator becomes larger, to
The mains voltage variations for counteracting charge pump provide charge pump the influence of charge capability, keep charge pump to provide charge capability permanent
It is fixed.
For oscillator embodiment and charge pump embodiment, since it includes above-mentioned biasing circuit, so description
It is fairly simple, related place illustrates referring to the part of biasing circuit embodiment.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiment, the same or similar parts between the embodiments can be referred to each other.
Although the preferred embodiment of the embodiment of the present invention has been described, once a person skilled in the art knows bases
This creative concept, then additional changes and modifications can be made to these embodiments.So the following claims are intended to be interpreted as
Including preferred embodiment and fall into all change and modification of range of embodiment of the invention.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or terminal device including a series of elements not only wrap
Those elements are included, but also include other elements that are not explicitly listed, or further include for this process, method, article
Or the element that terminal device is intrinsic.In the absence of more restrictions, being wanted by what sentence "including a ..." limited
Element, it is not excluded that there is also other identical elements in process, method, article or the terminal device including the element.
Above to a kind of biasing circuit provided by the present invention, a kind of oscillator and a kind of charge pump, detailed Jie has been carried out
It continues, principle and implementation of the present invention are described for specific case used herein, and the explanation of above example is only
It is the method and its core concept for being used to help understand the present invention；Meanwhile for those of ordinary skill in the art, according to this hair
Bright thought, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification should not manage
Solution is limitation of the present invention.
Claims (8)
1. a kind of biasing circuit, be applied to oscillator, which is characterized in that the biasing circuit include the first current mirror module and
Second current mirror module, the biasing circuit further include：
Diverter module, the diverter module respectively with the output end of the first current mirror module, second current mirror
The input terminal of module is connected with the Enable Pin of the oscillator, is preset when the enable signal amplitude of the oscillator is greater than or equal to
When value, the diverter module shunts the output current of the first current mirror module, and the electric current after output steering
To the second current mirror module；
Wherein, the enable signal amplitude of the electric current after the shunting and the oscillator is inversely proportional.
2. biasing circuit according to claim 1, which is characterized in that the diverter module includes：
First current branch, first current branch respectively with the output end of the first current mirror module and the oscillation
The Enable Pin of device is connected；The resistance value of first current branch and the enable signal amplitude of the oscillator are inversely proportional；
Second current branch, second current branch respectively with the output end of the first current mirror module and described second
The input terminal of current mirror module is connected；
When the enable signal amplitude of the oscillator is greater than or equal to the preset value, first current branch and described the
Two current branch conductives；
When the enable signal amplitude of the oscillator is less than the preset value, first current branch disconnects, and described second
Current branch conductive.
3. biasing circuit according to claim 2, which is characterized in that first current branch includes：
First NMOS tube, the drain terminal of first NMOS tube are connected with the output end of the first current mirror module, and described
The control terminal of one NMOS tube is connected with the Enable Pin of the oscillator；
At least one second NMOS tube, at least one second NMOS tube are connected in parallel, the drain terminal of second NMOS tube and
Control terminal is connected with the source of first NMOS tube respectively, the source ground connection of second NMOS tube.
4. biasing circuit according to claim 3, which is characterized in that the equivalent resistance of first NMOS tube shakes with described
The enable signal amplitude for swinging device is inversely proportional.
5. biasing circuit according to claim 3, which is characterized in that second current branch includes：
Third NMOS tube, the drain terminal of the third NMOS tube are connected with the output end of the first current mirror module, and described
The control terminal of three NMOS tubes is connected with the input terminal of the second current mirror module, the source ground connection of the third NMOS tube.
6. biasing circuit according to claim 5, which is characterized in that the size of first NMOS tube, described second
The size of NMOS tube is identical with the size of the third NMOS tube.
7. a kind of oscillator, which is characterized in that including the biasing circuit described in any one of claim 1-6.
8. a kind of charge pump, which is characterized in that including the oscillator described in claim 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710297563.5A CN108809080B (en) | 2017-04-28 | 2017-04-28 | Bias circuit, oscillator and charge pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710297563.5A CN108809080B (en) | 2017-04-28 | 2017-04-28 | Bias circuit, oscillator and charge pump |
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| CN108809080B CN108809080B (en) | 2024-02-20 |
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| CN111798905A (en) * | 2020-07-01 | 2020-10-20 | 深圳市芯天下技术有限公司 | Method, system, storage medium and terminal for reducing programming time of non-flash memory |
| CN115437453A (en) * | 2021-06-03 | 2022-12-06 | 上海艾为电子技术股份有限公司 | Biasing circuit and self-biased OSC circuit |
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| CN108809080B (en) | 2024-02-20 |
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