CN102497162A - High-precision current control ring oscillator circuit - Google Patents
High-precision current control ring oscillator circuit Download PDFInfo
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- CN102497162A CN102497162A CN201110359196XA CN201110359196A CN102497162A CN 102497162 A CN102497162 A CN 102497162A CN 201110359196X A CN201110359196X A CN 201110359196XA CN 201110359196 A CN201110359196 A CN 201110359196A CN 102497162 A CN102497162 A CN 102497162A
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Abstract
The invention discloses a high-precision ring oscillator circuit, comprising the following circuits: a band gap voltage reference circuit and a linear voltage-stabilizing circuit, and a reference current circuit which works under the voltage reference and generates a reference current not affected by temperature; a current control ring oscillator circuit, which receives the reference current and outputs an oscillation frequency signal, wherein the frequency of the oscillation frequency signal is double of a target frequency; a level conversion circuit, which converts the working voltage of the oscillation frequency signal from the voltage reference to the power supply voltage, under the power supply voltage; and a frequency-halving module circuit, which is used for performing frequency halving for the oscillation frequency signal so as to output a design index frequency with duty ratio of 50%. In the high-precision current control ring oscillator circuit, the reference voltage source circuit and the reference current source circuit are used for providing steady working voltage and working current for the ring oscillator, simultaneously, a six-position current fine tuning switch is used for selection, so as to offset the frequency deviation caused by variation of production technological conditions.
Description
Technical field:
The present invention relates to a kind of high-precision current control ring oscillator circuit.
Technical background:
Oscillator is a kind of energy conversion device-direct current energy is converted into AC energy with certain frequency.Ring oscillator utilizes the transmission delay of multistage inverter to form self-oscillation; Through adjusting the size of every grade of inverter delay time; The control frequency of oscillation can start fast, and cost is lower; But the precision in voltage and range of temperature is relatively poor, can in 20% to 50% scope of nominal output frequency, change.
Usually, the frequency of oscillation formula of ring oscillator:
f＝1/T＝1/(N*(tphl+tplh))
Wherein, T is the cycle, and N is the inverter progression of ring oscillator, and tphl is that inverter drops to the low level time from high level, and tplh is inverter rises to high level from low level time.
In addition, the frequency formula of Current Control annular oscillator:
f＝Ic/(2*N*Vout*Ci)
Wherein, Ic is the electric current of controlled inverter, and N is the progression of controlled inverter, and Vout is an output voltage, and Ci is every grade of inverter equivalent capacity.
It is very big that the ring oscillator of employing CMOS technology manufacturing is influenced by temperature and power supply and process deviation etc.; When temperature in-40C-+85C range; When operating voltage changes at 2.7V-5.5V; The frequency fluctuation scope of oscillator is generally more than 30%, and its frequency accuracy can't satisfy the requirement of plurality of applications occasion.
The CMOS ring oscillator of different editions has adopted technology such as bandgap voltage reference, multi-channel compensating system switch, revises the frequency drift that temperature and change in voltage and process deviation bring, but limited for the precision effect that improves the oscillator operating current.
Summary of the invention:
To the problems referred to above, the present invention's expectation has a kind of precision that can improve oscillator operating voltage and operating current simultaneously, and can revise the production technology deviation is brought influence to output frequency ring oscillator.
In order to realize the foregoing invention purpose, the invention discloses a kind of high accuracy ring oscillator circuit, a supply voltage and system's enable signal are provided, it is characterized in that said circuit further comprises:
A bandgap voltage reference circuit under said supply voltage and the enable signal control of said system, produces the bandgap voltage reference that not influenced by temperature and mains voltage variations, and a bias current is provided simultaneously;
A linear voltage-stabilizing circuit under said supply voltage, receives the bandgap voltage reference and the bias current of said bandgap voltage reference circuit, produces geometric ratio in the reference voltage of said bandgap voltage reference;
A reference current circuit connects the output of said linear voltage-stabilizing circuit, and work produces a not reference current of temperature influence under said reference voltage;
Current Control annular oscillating circuit connects the output of said reference current circuit and said linear voltage-stabilizing circuit, receives said reference current, under said reference voltage, works, and exports 2 times to an oscillation frequency signal of a target frequency;
A level shifting circuit connects the output of said Current Control annular oscillating circuit, under said supply voltage, makes said oscillation frequency signal operating voltage be transformed into said supply voltage from said reference voltage;
A two divided-frequency modular circuit connects the output of said level shifting circuit, and said oscillation frequency signal is carried out two divided-frequency, is 50% design objective frequency with output duty cycle.
Reasonablely be, said linear voltage-stabilizing circuit further comprises a differential amplifier circuit, and the negative feedback control of said differential amplifier circuit produces geometric ratio in the reference voltage of said bandgap voltage reference.
Reasonablely be, said Current Control annular oscillating circuit further comprises one 6 digit current selector switch, and said current selected switch adopts binary mode to arrange, the operating current of said Current Control annular oscillating circuit is carried out the binary weighting adjustment.
The present invention adopts reference voltage source and reference current source circuit, to ring oscillator stable operating voltage and operating current is provided, and adopts 6 digit current inching switchs to select simultaneously, offsets owing to manufacturing condition changes the frequency departure that produces.
Description of drawings:
Below, with reference to accompanying drawing, for those skilled in the art that, from the detailed description to the inventive method, above-mentioned and other purposes of the present invention, feature and advantage will be obvious.
Fig. 1 is the module map of a high accuracy ring oscillator of the present invention;
Fig. 2 is a bandgap voltage reference circuit diagram among Fig. 1;
Fig. 3 is Fig. 1 neutral line voltage stabilizing circuit sketch map;
Fig. 4 is a reference current circuit sketch map among Fig. 1;
Fig. 5 is a ring oscillator circuit sketch map among Fig. 1;
Fig. 6 is a level shifting circuit sketch map among Fig. 1;
Fig. 7 is a two divided-frequency modular circuit sketch map among Fig. 1.
Embodiment:
The present invention relates to a kind of current with high accuracy control ring oscillator.Below describe and make those skilled in the art and require to use the present invention according to application-specific.
Fig. 1 is the module diagram of a kind of high accuracy ring oscillator of the present invention.This ring oscillator is made up of six sub-module circuit, comprising: bandgap voltage reference circuit 10, linear voltage-stabilizing circuit 20, reference current circuit 30, annular oscillation circuit 40, level shifting circuit 50 and two divided-frequency modular circuit 60.
Wherein, the supply voltage Vdd of bandgap voltage reference circuit 10, the enable signal EN of system control produces the output voltage V bg that not influenced by temperature and mains voltage variations, provides bias current Ibias to linear voltage-stabilizing circuit 20 (Line Regulator) simultaneously; Linear voltage-stabilizing circuit 20 is connected the output of bandgap voltage reference circuit 10; Its operating voltage also is supply voltage Vdd; Accept the operating current Ibias of bandgap voltage reference circuit 10 outputs, the negative feedback control of its differential amplifier circuit produces geometric ratio in the reference voltage V ddi of bandgap voltage reference Vbg; Reference current circuit 30 is connected the output of linear voltage-stabilizing circuit 20, and work produces the not reference current Iref of temperature influence under its reference voltage V ddi; One end of Current Control annular oscillating circuit 40 connects the output of reference circuit circuit 30, and the other end connects linear voltage-stabilizing circuit 20, under its reference voltage V ddi, works, and operating current is Iref, export stable 2 times to the frequency of oscillation of design objective; One end of level shifting circuit 50 is connected the output of Current Control annular oscillator 40; Second end connects the output of linear voltage-stabilizing circuit 20; Its operating voltage is supply voltage Vdd, makes the operating voltage of oscillator signal be transformed into supply voltage Vdd from reference voltage V ddi; Two divided-frequency modular circuit 60 is connected the output of level shifting circuit 50, and the oscillator signal that prime level shifting circuit 50 is provided carries out two divided-frequency, guarantees that output duty cycle is 50% design objective frequency.
Fig. 2 provides the line map of bandgap voltage reference circuit 10 among Fig. 1; Its operating voltage is supply voltage Vdd; And receiving oscillator enable signal En control, its output voltage V bg is not influenced by temperature and mains voltage variations, offers linear voltage-stabilizing circuit 20 as the input reference level Vref; This bandgap voltage reference circuit 10 is used to produce bias current Ibias, as the electric current input of linear voltage-stabilizing circuit 20.
Fig. 3 provides the conspectus of Fig. 1 neutral line voltage stabilizing circuit 20, and its operating voltage still is supply voltage Vdd, and its operating current is the bias current Ibias that prime bandgap voltage reference circuit 10 produces, and receives the control of oscillator enable signal En; Through relatively importing the Proportional Feedback of reference level Vref and output level, the control of the negative feedback of portion's amplifier 201 within it produces constant output services voltage Vddi down.
Fig. 4 provides the conspectus of reference current circuit 30 among Fig. 1, and its operating voltage is the output services voltage Vddi that prime linear voltage-stabilizing circuit 20 provides, and the output current Iref of its generation does not receive influence of temperature change, offers Current Control annular oscillator.
Fig. 5 has provided the conspectus of Current Control annular oscillator 40 among Fig. 1; Comprise between 6 digit current selector switch T1～T6 it being that binary mode is arranged; Operating current is carried out binary weighting fine setting, to offset because the current deviation in the work loop of the ring oscillator 40 that the technique change of chip production process is brought.The operating voltage of this ring oscillator 40 is the operating voltage Vddi that linear voltage-stabilizing circuit 20 outputs provide; And receive oscillator enable signal En control; The operating current of this ring oscillator 40 is the output current Iref that reference current circuit 30 produces; The every grade of inverter electric current in the inside of this ring oscillator 40 receives 6 binary weighting proportional control, and this ring oscillator 40 is produced as the output frequency of 2 times of design objectives, and its reference voltage is Vddi.
Fig. 6 has provided the conspectus of level shifting circuit 50 among Fig. 1, and its operating voltage is supply voltage Vdd, makes the signal level of frequency of oscillation be transformed into operating voltage Vdd from reference voltage V ddi.
Fig. 7 has provided the conspectus of two divided-frequency modular circuit 60 among Fig. 1, and its operating voltage is supply voltage Vdd, and oscillation signal frequency is carried out two divided-frequency, the design objective frequency of output duty cycle 50%.
More than all embodiment only supply to explain the present invention's usefulness; But not limitation of the present invention; The technical staff in relevant technologies field; Under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or variation, so all technical schemes that are equal to also should belong to category of the present invention and should be limited each claim.
Claims (3)
1. a high accuracy ring oscillator circuit provides a supply voltage and system's enable signal, it is characterized in that said circuit further comprises:
A bandgap voltage reference circuit under said supply voltage and the enable signal control of said system, produces the bandgap voltage reference that not influenced by temperature and mains voltage variations, and a bias current is provided simultaneously;
A linear voltage-stabilizing circuit under said supply voltage, receives the bandgap voltage reference and the bias current of said bandgap voltage reference circuit, produces geometric ratio in the reference voltage of said bandgap voltage reference;
A reference current circuit connects the output of said linear voltage-stabilizing circuit, and work produces a not reference current of temperature influence under said reference voltage;
Current Control annular oscillating circuit connects the output of said reference current circuit and said linear voltage-stabilizing circuit, receives said reference current, under said reference voltage, works, and exports 2 times to an oscillation frequency signal of a target frequency;
A level shifting circuit connects the output of said Current Control annular oscillating circuit, under said supply voltage, makes said oscillation frequency signal operating voltage be transformed into said supply voltage from said reference voltage;
A two divided-frequency modular circuit connects the output of said level shifting circuit, and said oscillation frequency signal is carried out two divided-frequency, is 50% design objective frequency with output duty cycle.
2. high accuracy ring oscillator circuit according to claim 1 is characterized in that,
Said linear voltage-stabilizing circuit further comprises a differential amplifier circuit, and the negative feedback control of said differential amplifier circuit produces geometric ratio in the reference voltage of said bandgap voltage reference.
3. high accuracy ring oscillator circuit according to claim 1 and 2 is characterized in that,
Said Current Control annular oscillating circuit further comprises one 6 digit current selector switch, and said current selected switch adopts binary mode to arrange, the operating current of said Current Control annular oscillating circuit is carried out the binary weighting adjustment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110359196XA CN102497162A (en) | 2011-11-14 | 2011-11-14 | High-precision current control ring oscillator circuit |
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| CN201110359196XA CN102497162A (en) | 2011-11-14 | 2011-11-14 | High-precision current control ring oscillator circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105227180A (en) * | 2015-05-06 | 2016-01-06 | 上海晟矽微电子股份有限公司 | A kind of ring oscillator circuit |
| CN105703712A (en) * | 2015-12-31 | 2016-06-22 | 峰岹科技（深圳）有限公司 | High-precision RC oscillator |
| CN103944512B (en) * | 2014-04-17 | 2017-02-15 | 重庆西南集成电路设计有限责任公司 | Oscillator circuit with high frequency stability and negative temperature coefficient current source circuit |
| CN109791421A (en) * | 2016-05-31 | 2019-05-21 | 高基时间 | Time arbitration circuit |
| CN113176482A (en) * | 2020-01-08 | 2021-07-27 | 中芯国际集成电路制造（天津）有限公司 | Test circuit, test system and test method thereof |
| CN115547021A (en) * | 2022-11-24 | 2022-12-30 | 深圳市美矽微半导体有限公司 | Infrared emission and detection integrated chip |
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| US20030132806A1 (en) * | 2002-01-16 | 2003-07-17 | Kabushiki Kaisha Toshiba | Voltage controlled oscillator with reference current generator |
| JP2003283306A (en) * | 2002-03-25 | 2003-10-03 | Rohm Co Ltd | Oscillator |
| US20050242894A1 (en) * | 2002-08-28 | 2005-11-03 | Isami Kato | Oscillator circuit |
| WO2007085003A2 (en) * | 2006-01-20 | 2007-07-26 | Sirf Technology, Inc. | Method of eliminating temperature induced band switching in ultra wideband voltage controlled oscillator |
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2011
- 2011-11-14 CN CN201110359196XA patent/CN102497162A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030132806A1 (en) * | 2002-01-16 | 2003-07-17 | Kabushiki Kaisha Toshiba | Voltage controlled oscillator with reference current generator |
| JP2003283306A (en) * | 2002-03-25 | 2003-10-03 | Rohm Co Ltd | Oscillator |
| US20050242894A1 (en) * | 2002-08-28 | 2005-11-03 | Isami Kato | Oscillator circuit |
| WO2007085003A2 (en) * | 2006-01-20 | 2007-07-26 | Sirf Technology, Inc. | Method of eliminating temperature induced band switching in ultra wideband voltage controlled oscillator |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944512B (en) * | 2014-04-17 | 2017-02-15 | 重庆西南集成电路设计有限责任公司 | Oscillator circuit with high frequency stability and negative temperature coefficient current source circuit |
| CN105227180A (en) * | 2015-05-06 | 2016-01-06 | 上海晟矽微电子股份有限公司 | A kind of ring oscillator circuit |
| CN105703712A (en) * | 2015-12-31 | 2016-06-22 | 峰岹科技（深圳）有限公司 | High-precision RC oscillator |
| CN105703712B (en) * | 2015-12-31 | 2019-04-09 | 峰岹科技（深圳）有限公司 | High-precision RC oscillator |
| CN109791421A (en) * | 2016-05-31 | 2019-05-21 | 高基时间 | Time arbitration circuit |
| CN109791421B (en) * | 2016-05-31 | 2023-08-04 | 溯源时间科技 | Time arbitration circuit |
| CN113176482A (en) * | 2020-01-08 | 2021-07-27 | 中芯国际集成电路制造（天津）有限公司 | Test circuit, test system and test method thereof |
| CN113176482B (en) * | 2020-01-08 | 2023-03-07 | 中芯国际集成电路制造（天津）有限公司 | Test circuit, test system and test method thereof |
| CN115547021A (en) * | 2022-11-24 | 2022-12-30 | 深圳市美矽微半导体有限公司 | Infrared emission and detection integrated chip |
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Application publication date: 20120613 |