CN105322888B - The circuit system and its operating method of supply voltage are adjusted according to thermal adaptability - Google Patents
The circuit system and its operating method of supply voltage are adjusted according to thermal adaptability Download PDFInfo
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- CN105322888B CN105322888B CN201410253294.9A CN201410253294A CN105322888B CN 105322888 B CN105322888 B CN 105322888B CN 201410253294 A CN201410253294 A CN 201410253294A CN 105322888 B CN105322888 B CN 105322888B
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Abstract
The present invention provides a kind of circuit system, wherein including an electric current supply module, a voltage supply module and a voltage controlled oscillator.The electric current supply module is providing the electric current with a variation of ambient temperature.The voltage supply module generates a supply voltage to receive the electric current according to the electric current.The voltage controlled oscillator receives the supply voltage, and generates an oscillator signal according to the supply voltage.
Description
Technical field
The present invention is related to circuit system, and the technology of supply voltage is especially provided with the element adaptability in circuit system
It is related.
Background technology
Voltage controlled oscillator is the critical elements being widely used in a variety of electronic systems.In general, by one section
After usage time, the temperature of electronic product can increase.The rising of environment temperature is shaken the output signal for causing voltage controlled oscillator
Width declines, and then the performance of its phase noise (phase noise) is made to be deteriorated.On the other hand, voltage controlled oscillator is also deposited when high temperature
The problem of being less susceptible to starting of oscillation.In view of the above-mentioned problems, current solution is changed according to environmental adaptability mostly
It is supplied to the source current amount of voltage controlled oscillator.More particularly, when environment temperature increases, it is provided to the electricity of voltage controlled oscillator
Ource electric current amount is also incremented by, to the amplitude of the output signal of compensated voltage controlled oscillator.
A kind of schematic diagram of current practice is presented in Fig. 1.The running electric power of voltage controlled oscillator 120 is supplied by current source 140.Such as
Known to persons of ordinary skill in the technical field of the present invention, current source 140 is proportional to absolute temperature (proportional for one
To absolute temperature, PTAT) current source, output current IPTATSize be proportional to absolute temperature.Fig. 1 this
The shortcomings that kind way, is that, in order to reduce phase noise as possible, the p-type OH that current mirror is constituted in current source 140 is brilliant
Body pipe must be configured to have sizable size, that is, occupy sizable chip area.
The schematic diagram of another current practice is presented in Fig. 2.The running electric power of voltage controlled oscillator 220 is by programmable current source
242 supplies, and control circuit 244 can determine programmable current source 242 according to the ambient temperature information that thermal sensor 246 detects
The magnitude of current that should be exported.In practice, control circuit 244 is normally built a look-up table, to pair of storage temperature and the magnitude of current
It should be related to.One of the shortcomings that this ways of Fig. 2 is must additional thermal sensor 246.Second disadvantage is to work as lookup result
Change, when must switch 242 internal switch of programmable current source to adjust the magnitude of current, the discontinuous variation of source current may be led
The output frequency of voltage controlled oscillator 220 is caused to beat.For the frequency division duplexing (frequency of stable connection state need to be kept
Division duplexing, FDD) it system or need to keep for the TV tuner (TV tuner) of frame stabilization, frequency
Bounce is quite serious problem.
The schematic diagram of another current practice is presented in Fig. 3.The running electric power of voltage controlled oscillator 320 is by programmable current source
342 supplies, and the signal amplitude that control circuit 344 can be detected according to amplitude detector 346 determines that programmable current source 342 is answered
The magnitude of current of output.One of the shortcomings that this ways of Fig. 3 be must additional amplitude detector 346, second disadvantage is
It is likely to occur the situation of frequency jitter.
The common point of three of the above known technology is to be supplied to voltage controlled oscillator according to environmental adaptability change
Source current amount, but disadvantage is individually present.
Invention content
A specific embodiment according to the present invention is a kind of circuit system, wherein including an electric current supply module, a voltage
Supply module and a voltage controlled oscillator.The electric current supply module is provided for the electric current with a variation of ambient temperature.It should
Voltage supply module is to receive the electric current, and generate a supply voltage according to the electric current.The voltage controlled oscillator receives the electricity
Source voltage, and an oscillator signal is generated according to the supply voltage.Wherein the electric current makes the supply voltage change with temperature, with compensation
One amplitude of the oscillator signal.
Another specific embodiment according to the present invention is a kind of circuit system operating method, is comprised the steps of：(a) it provides
With an electric current of a variation of ambient temperature；(b) supply voltage is generated according to the electric current；And (c) according to the supply voltage
Generate an oscillator signal.Wherein the electric current makes the supply voltage change with temperature, to compensate an amplitude of the oscillator signal.
Description of the drawings
For the above objects, features and advantages of the present invention can be clearer and more comprehensible, below in conjunction with attached drawing to the tool of the present invention
Body embodiment elaborates, wherein：
Fig. 1~Fig. 3 is the schematic diagram for being painted known technique for temperature compensation.
Fig. 4 is the functional block diagram according to the circuit system in one embodiment of the invention.
The detailed example of electric current supply module in Fig. 5 A and Fig. 5 B presentations according to an embodiment of the invention.
The detailed example of voltage supply module in Fig. 6 A and Fig. 6 B presentations according to an embodiment of the invention.
The detailed example of Voltage-voltage converting unit in Fig. 7 A~Fig. 7 D presentations according to an embodiment of the invention.
Fig. 8 is the flow chart according to the circuit system operating method in one embodiment of the invention.
Component label instructions are as follows in figure：
120、220、320：Voltage controlled oscillator 140：Current source
242、342：Programmable current source 244,344：Control circuit
246：Thermal sensor 346：Amplitude detector 346
400：Circuit system 420：Voltage controlled oscillator
440：Electric current supply module 440A：PTAT current generator
440B：The current generator 440C of unrelated temperature：Adder
440D：First multiplier 440E：Second multiplier
450：Circuit node 460：Voltage supply module
460A：Current-voltage converting unit 460B：Voltage-voltage converting unit
S810~S830：Process step
Specific implementation mode
It needs first to illustrate herein, a so-called word of the invention is the invention censured these embodiments and presented herein
Concept, but its covering scope is not limited by these embodiments itself.The attached drawing of the present invention includes that presentation is a variety of associated with each other
The functional block diagram of functional module.These schemas are not thin portion circuit diagram, and connecting line therein is only indicating signal stream.
A variety of interactive relationship between functional element and/or program are not necessarily intended to just reach by direct electrical connection.In addition, a
The function of other element is not necessarily intended to distribute such as the mode being painted in attached drawing, and the block of discrete type is not necessarily intended to the electricity with discrete type
Subcomponent is realized.
A specific embodiment according to the present invention is a kind of circuit system, and functional block diagram is depicted in Fig. 4.Circuit system
System 400 includes an electric current supply module 440, a voltage supply module 460 and a voltage controlled oscillator 420.Electric current supply module 440
To provide the electric current I with a variation of ambient temperatureSUP.Voltage supply module 460 is coupled to electric current supply module 440, connects
Receive electric current ISUP, and according to electric current ISUPGenerate a supply voltage VSUP.Voltage controlled oscillator 420 is coupled to voltage supply module 460,
Receive supply voltage VSUP, and according to supply voltage VSUPGenerate an oscillator signal.In this embodiment, electric current supply module 440
The electric current I of generationSUPIt can increase with the rising of temperature, and the supply voltage V that voltage supply module 460 generatesSUPIt also can phase
Accordingly with electric current ISUPIncrease and improves.The function mode of each mac function described below.
In electric current supply module 440, electric current ISUPIt is designed to the relativeness of environment temperature：Enable supply voltage VSUP
The amplitude that the output signal of voltage controlled oscillator 420 can be generally remained is not influenced by ambient temperature.In practice, circuit designers can root
Amplitude response according to voltage controlled oscillator 420 is that electric current supply module 440 determines electric current ISUPWith the relativeness of environment temperature.Easily
Yan Zhi, scope of the invention are not limited to specific currents ISUPWith environment temperature relativeness.In an embodiment, electric current supplies mould
Block 440 is proportional to absolute temperature (PTAT) current generator comprising one, and absolute temperature electric current is proportional to generate one, as carrying
It is supplied to the electric current I of voltage supply module 460SUP。
In another embodiment, as shown in Figure 5A, electric current supply module 440 is proportional to absolute temperature (PTAT) electricity comprising one
Flow generator 440A, the current generator 440B of a unrelated temperature and an adder 440C.PTAT current generator 440A to
It generates one and is proportional to absolute temperature electric current IPTAT.The current generator 440B of unrelated temperature is the electricity for generating a unrelated temperature
Flow IBG.It is proportional to absolute temperature electric current IPTATWith the electric current I of unrelated temperatureBGAfter adder 440C additions, becomes and be provided to
The electric current I of voltage supply module 460SUP.Here, the electric current of unrelated temperature caused by the current generator 440B of unrelated temperature
IBGDo not change with temperature, that is to say, that the electric current I of unrelated temperatureBGNo matter in any temperature size can be all kept fixed, because
It acts as in electric current I for thisSUPOne fixed current amount of middle addition.In practical application, if must be electric in being proportional to absolute temperature
Flow IPTATExcept the electric current I of unrelated temperature is addedBG, hold depending on the amplitude of voltage controlled oscillator 420 is relative to the characteristic of temperature.It is real
In business, the current generator 440B of unrelated temperature can be realized by a band gap (bandgap) current generator.
As shown in Figure 5 B, electric current supply module 440 can further include one first multiplier 440D and one second multiplier
440E.First multiplier 440D is will be proportional to absolute temperature electric current IPTATIt is multiplied by one first ratio a, to generate electric current ISUP
In the first current component.Second multiplier 440E is then to by the electric current I of unrelated temperatureBGIt is multiplied by one second ratio b, to generate
Electric current ISUPIn one second current component.In practice, the first ratio a and the second ratio b are one according to voltage controlled oscillator 420
Amplitude is determined relative to temperature characterisitic.It for example, can be by the modes such as measurement and/or simulation before circuit system manufacture
It learns characteristic of the amplitude relative to temperature of voltage controlled oscillator 420, and then determines the first ratio a and the second ratio b appropriate.This
Outside, the first multiplier 440D and the second multiplier 440E can be realized respectively with a current mirror.
As shown in Figure 6A, voltage supply module 460 may include a current-voltage converting unit 460A and a Voltage-voltage
Converting unit 460B.Current-voltage converting unit 460A is to by electric current ISUPBe converted to a medium voltage VINTER.Voltage-voltage
Converting unit 460B is then to by medium voltage VINTERBe converted to supply voltage VSUP.For example, current-voltage converting unit
460A can be a resistive element, as shown in Figure 6B.Electric current ISUPIt is intermediate to flow into the voltage formed in node 450 after the resistance
Voltage VINTER.In practice, Voltage-voltage converting unit 460B can be a low-voltage-drop linear voltage regulator (low-dropout
Regulator), a DC decompression converter (step-down DC-DC converter), a DC boost converter (step-
Up DC-DC converter) or a charge pump (charge pump).Above-mentioned four kinds of possible DC voltages-voltage converts state
Sample is illustrated in Fig. 7 A~Fig. 7 D respectively.It should be noted that the detailed reality of various current-voltage conversions and Voltage-voltage conversion
It is not repeated in this known to persons of ordinary skill in the technical field of the present invention to apply mode.
It is worth noting that, the voltage controlled oscillator in many circuit systems is provided with low-voltage-drop linear voltage regulator etc. originally
The voltage of Voltage-voltage conversion circuit, script output can't change with temperature, and the present invention proposes to supply mould by electric current
Block 440 provides the electric current I changed with temperatureSUPAnd current-voltage converting unit 460A, in conjunction with script in original circuit system
The Voltage-voltages conversion circuit such as low-voltage-drop linear voltage regulator having, and then the power supply for making Voltage-voltage conversion circuit export
Voltage VSUPChange with temperature, with the amplitude of compensated voltage controlled oscillator 420.Therefore, volume is not needed using way according to the present invention
The outer circuit element for increasing many large area.Furthermore either use PTAT current generator (such as 440A) or PTAT electricity
The combination of flow generator and bandgap current generator, electric current ISUPAnd supply voltage VSUPWhen changing with temperature, be all not in
Discontinuous amplitude jitter, thus the problem of be avoided frequency jitter in known technology.
Another specific embodiment according to the present invention is a kind of circuit system operating method, and flow chart is depicted in Fig. 8.
Step S810 is the electric current provided with a variation of ambient temperature.The electric current generates a supply voltage according to step S820.
The supply voltage generates an oscillator signal according to step S830.Persons of ordinary skill in the technical field of the present invention can manage
Solution, the various operation changes previously described when introducing circuit system 400 can also be applied to the circuit system operation side in Fig. 8
Method, details repeat no more.
Although the present invention is disclosed as above with preferred embodiment, however, it is not to limit the invention, any this field skill
Art personnel, without departing from the spirit and scope of the present invention, when can make a little modification and it is perfect, therefore the present invention protection model
It encloses to work as and is subject to what claims were defined.
Claims (8)
1. a kind of circuit system, including：
One electric current supply module, to provide the electric current with a variation of ambient temperature；
One voltage supply module receives the electric current, and generates a supply voltage according to the electric current；And
One voltage controlled oscillator receives the supply voltage, and generates an oscillator signal according to the supply voltage；
The electric current makes the supply voltage change with temperature, to compensate an amplitude of the oscillator signal；
Wherein the electric current supply module includes：
One is proportional to absolute temperature (PTAT) current generator, and absolute temperature electric current is proportional to generate one；And
The current generator of one unrelated temperature, to generate the electric current of a unrelated temperature；
The electric current that the electric current supply module provides is proportional to that absolute temperature electric current is related to this, and the electric current of temperature unrelated with this
It is related；
One first multiplier is multiplied by one first ratio, to generate one in the electric current this is proportional to absolute temperature electric current
First current component；And
One second multiplier, the electric current of the unrelated temperature is multiplied by one second ratio, to generate one second in the electric current
Current component；
First ratio and second ratio are determined relative to temperature characterisitic according to the amplitude of the oscillator signal.
2. circuit system as described in claim 1, which is characterized in that the current generator of the unrelated temperature is a bandgap current
Generator.
3. circuit system as described in claim 1, which is characterized in that first multiplier is with second multiplier respectively with one
Current mirror (current mirror) is realized.
4. circuit system as described in claim 1, which is characterized in that the voltage supply module includes：
One current-voltage converting unit, to convert that current to a medium voltage；And
One Voltage-voltage converting unit, the medium voltage is converted to the supply voltage.
5. circuit system as claimed in claim 4, which is characterized in that the current-voltage converting unit is a resistive element.
6. circuit system as claimed in claim 4, which is characterized in that the Voltage-voltage converting unit is a low-voltage drop linear
Voltage-stablizer (low-dropout regulator), a DC decompression converter (step-downDC-DC converter), always
Flow boost converter (step-up DC-DC converter) or a charge pump (charge pump).
7. a kind of circuit system operating method, including：
(a) electric current with a variation of ambient temperature is provided；(b) supply voltage is generated according to the electric current；
And
(c) oscillator is controlled to generate an oscillator signal according to the supply voltage；
Wherein the electric current makes the supply voltage change with temperature, to compensate an amplitude of the oscillator signal；
Wherein step (a) includes：
It generates one and is proportional to absolute temperature electric current；
Generate the electric current of a unrelated temperature；And
The electric current that this is proportional to absolute temperature electric current temperature unrelated with this is added, as the electric current；
Wherein by this be proportional to absolute temperature electric current temperature unrelated with this electric current be added the step of include：
This is proportional to absolute temperature electric current and is multiplied by one first ratio, to generate one first current component in the electric current；And
The electric current of the unrelated temperature is multiplied by one second ratio, to generate one second current component in the electric current；
First ratio and second ratio are determined relative to temperature characterisitic according to the amplitude of the oscillator signal.
8. circuit system operating method as claimed in claim 7, which is characterized in that step (b) includes：
Convert that current to a medium voltage；And
The medium voltage is converted into the supply voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410253294.9A CN105322888B (en) | 2014-06-09 | 2014-06-09 | The circuit system and its operating method of supply voltage are adjusted according to thermal adaptability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410253294.9A CN105322888B (en) | 2014-06-09 | 2014-06-09 | The circuit system and its operating method of supply voltage are adjusted according to thermal adaptability |
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| Publication Number | Publication Date |
|---|---|
| CN105322888A CN105322888A (en) | 2016-02-10 |
| CN105322888B true CN105322888B (en) | 2018-07-17 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809236A (en) * | 2017-11-15 | 2018-03-16 | 中国科学技术大学 | A kind of inductance capacitance type voltage controlled oscillator with temperature-compensating |
| JP7199330B2 (en) * | 2019-09-19 | 2023-01-05 | 株式会社東芝 | regulator circuit |
| CN113395042B (en) * | 2021-06-05 | 2022-08-05 | 苏州瀚宸科技有限公司 | High-frequency low-power-consumption low-jitter voltage-controlled oscillator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1705235A (en) * | 2004-05-31 | 2005-12-07 | 凌阳科技股份有限公司 | Voltage controlled oscillator |
| CN101621018A (en) * | 2009-07-31 | 2010-01-06 | 上海集成电路研发中心有限公司 | Metal-oxide-semiconductor field effect transistor (MOSFET) frequency characteristic derivation detector and detecting method thereof |
| CN102017417A (en) * | 2008-04-22 | 2011-04-13 | 高通股份有限公司 | Voltage controlled oscillator temperature compensation using auxiliary varactor |
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2014
- 2014-06-09 CN CN201410253294.9A patent/CN105322888B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1705235A (en) * | 2004-05-31 | 2005-12-07 | 凌阳科技股份有限公司 | Voltage controlled oscillator |
| CN102017417A (en) * | 2008-04-22 | 2011-04-13 | 高通股份有限公司 | Voltage controlled oscillator temperature compensation using auxiliary varactor |
| CN101621018A (en) * | 2009-07-31 | 2010-01-06 | 上海集成电路研发中心有限公司 | Metal-oxide-semiconductor field effect transistor (MOSFET) frequency characteristic derivation detector and detecting method thereof |
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Effective date of registration: 20200407 Address after: No.1, Duhang 1st Road, Hsinchu City, Hsinchu Science Park, Taiwan, China Patentee after: MEDIATEK Inc. Address before: Taiwan Hsinchu County Tai Yuan Street China jhubei City, No. 26 4 floor 1 Patentee before: MStar Semiconductor, Inc. |
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