CN106774587A - A kind of low pressure difference linear voltage regulator - Google Patents
A kind of low pressure difference linear voltage regulator Download PDFInfo
- Publication number
- CN106774587A CN106774587A CN201611104174.8A CN201611104174A CN106774587A CN 106774587 A CN106774587 A CN 106774587A CN 201611104174 A CN201611104174 A CN 201611104174A CN 106774587 A CN106774587 A CN 106774587A
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- Prior art keywords
- circuit
- low pressure
- pressure difference
- voltage regulator
- difference linear
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/563—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices including two stages of regulation at least one of which is output level responsive, e.g. coarse and fine regulation
Abstract
The present invention relates to a kind of low pressure difference linear voltage regulator, with numerical model analysis regulatory function, belong to IC design field；The low pressure difference linear voltage regulator carries out coarse adjustment using digital form to output current.The analog signal of error amplifier output is converted into data signal, Digital Logic control circuit is by treatment output control word, control electric current source array exports appropriate electric current, the low pressure difference linear voltage regulator it is also possible to use analog form and carry out thin tuning to output current, after coarse adjustment completion, the analog signal exported with error amplifier controls the grid of adjustment pipe, trickle adjustment is carried out to output current, the low pressure difference linear voltage regulator has larger output current scope, output current precision higher, and output current is not disturbed by mains voltage variations, output voltage ripple is smaller.
Description
Technical field
The invention belongs to IC design technical field, more particularly to a kind of low pressure difference linear voltage regulator.
Background technology
Low pressure difference linear voltage regulator (Low Dropout Regulator, LDO) is a kind of power supply circuit, with output electricity
The advantages of pressure is stable, ripple is small, has a wide range of applications in integrated circuits.
Fig. 1 is simulation low pressure difference linear voltage regulator schematic diagram.As load RL、CLDuring change, if its load current is constant,
Then supply voltage VOUTChange, feedback voltage VFChange, VFWith fixed reference voltage VREFCompare, amplify by error amplifier
After obtain control voltage VC, adjustment load pipe M1Gate source voltage.The loop is feedback loop, under negative feedback, power supply
Voltage VOUTIt is stabilized in a value for determination, the electric current needed for exporting it to load.The problem of the circuit is single adjustment pipe
The current range that can be output is limited, therefore the load excursion that can be driven is also limited.
Fig. 2 is digital low pressure difference linear voltage regulator schematic diagram.Its operation principle is similar with simulation low pressure difference linear voltage regulator.
Something in common is detection output voltage VOUTChange, be a difference in that digital LDO by comparator feedback voltage VFAnd reference
Voltage VREFBetween error voltage digitlization, by digital error signal D0Send digitial controller to, controller is then by fortune
Calculate output control code, regulation metal-oxide-semiconductor MS1~MSNBreak-make, metal-oxide-semiconductor conducting then provides output current, shut-off then not output current.
The current range of metal-oxide-semiconductor array output is larger, but still suffers from some problems.One is when mains voltage variations, when metal-oxide-semiconductor is turned on
Electric current can also change.If two be will while have electric current degree of regulation and big electric current adjusting range high, need compared with
Many metal-oxide-semiconductors, small metal-oxide-semiconductor determines the precision of curent change, and big metal-oxide-semiconductor determines the scope of curent change.Three is by frequently
Switch switching carrys out variable-current can produce larger ripple in the output of LDO.
The content of the invention
In order to overcome the shortcoming of above-mentioned prior art, it is an object of the invention to provide a kind of low pressure difference linear voltage regulator,
With numerical model analysis regulatory function, coarse adjustment first is carried out to output current using digital regulated mode, then use analog regulation
Mode carries out thin tuning to output current such that it is able to output on a large scale, high-precision electric current.
To achieve these goals, the technical solution adopted by the present invention is：
A kind of low pressure difference linear voltage regulator, output voltage is VOUT, load resistance RLWith load capacitance CLAnd it is connected in VOUTWith
Between GND, by sampling resistor RF1With resistance RF2To VOUTPartial pressure sampling is carried out, feedback voltage V is obtainedF, VFAnd reference voltage
VREFAnalog output voltage V is obtained after error amplifier compares amplificationC, VCCoarse tuning circuit is given by a branch road, is passed through
Another branch road gives fine tuning circuit, and the coarse tuning circuit is used for the break-make of control electric current source array, the fine tuning circuit it is defeated
Go out connection adjustment pipe M0Grid, current source array forms by some branch circuit parallel connections, for LDO loads provide electric current, every branch road
In series by current source and switching tube, coarse tuning circuit is by the break-make of controlling switch pipe come the logical of control electric current source array
It is disconnected, the adjustment pipe M0With each branch circuit parallel connection of current source array.
The coarse tuning circuit includes clock, ADC and digital logic control circuit, and clock circuit is to ADC and Digital Logic control
Circuit processed provides clock signal, VCADC is first passed through after input coarse adjustment control module and be transformed to data signal, be then passed to numeral and patrol
Collect control circuit, the break-make of the output control current source array breaker in middle pipe of Digital Logic control circuit.
Circuit can be enabled to fine tuning circuit, reset control for the Digital Logic control.
The grid of the current source in the current source array provides bias voltage by biasing circuit.
When error signal is less than a certain numerical value, coarse conditioning process terminates, and starts thin tuning.
Compared with prior art, coarse adjustment is carried out to LDO output currents the beneficial effects of the invention are as follows using digital circuit,
Thin tuning is carried out to LDO output currents using analog circuit, so that LDO has larger output current scope, output higher
Current precision, and output current do not disturbed by mains voltage variations, output voltage ripple is smaller.
Brief description of the drawings
Fig. 1 is simulation low pressure difference linear voltage regulator schematic diagram.
Fig. 2 is digital low pressure difference linear voltage regulator schematic diagram.
Fig. 3 is the low pressure difference linear voltage regulator schematic diagram with numerical model analysis regulatory function.
Fig. 4 is the workflow diagram of the low pressure difference linear voltage regulator with numerical model analysis regulatory function.
Specific embodiment
Below in conjunction with the accompanying drawings, preferred embodiment is elaborated.It is emphasized that the description below is merely exemplary
, rather than in order to limit the scope of the present invention and its application.
A kind of low pressure difference linear voltage regulator principle with numerical model analysis regulatory function proposed by the present invention is as shown in Figure 3.
The load of LDO is RLAnd CL, output voltage is VOUT, through resistance RF1、RF2Feedback voltage V is obtained after partial pressureF, VFAnd reference voltage
VREFAnalog output voltage V is obtained after error amplifier compares amplificationC。VCCoarse tuning circuit is given by a branch road, is passed through
Another branch road gives fine tuning circuit.Coarse tuning circuit includes the parts such as clock, ADC and digital logic control.Clock circuit is to ADC
And Digital Logic control circuit provides clock signal.VCADC is first passed through after input coarse adjustment control module and be transformed to data signal, so
After give Digital Logic control circuit, Digital Logic control circuit output control switch pipe MS1~MSNBreak-make.Digital Logic
Control circuit such as can also be enabled, be resetted at the control to fine tuning circuit.Current source M1~MNWith switch MS1~MSNComposition is included
The current source array of a plurality of parallel branch provides electric current, current source M for LDO loads1~MNGrid provide biasing by biasing circuit
Voltage.The output connection adjustment pipe M of fine tuning circuit0Grid, M0And M1-MS1…MN-MSNBranch circuit parallel connection, can adjust the output of LDO
Electric current.
In coarse adjustment, first turn off fine tuning circuit, be compared for itself and reference voltage, amplify by LDO detection feedback voltages
Afterwards, coarse tuning circuit is sent to.Error signal is converted into data signal by A-D converter (ADC) first, then numeral is patrolled
Collecting control circuit judges needs the size of current of output and produces the break-make of corresponding control word control electric current source array, and output is fitted
When electric current.When the error signal for receiving is less than a certain numerical value, coarse conditioning process terminates.
After coarse tuning process terminates, start fine-tuning process.Fine tuning circuit is opened, now the analog output voltage of error amplifier
The adjustment tube grid of its connection is adjusted, output current is accurately adjusted in a small range.
Specifically, the course of work of LDO regulations output current is as shown in Figure 4.Error amplifier output signal VC.VC is passed through
Cross ADC conversion and obtain data signal.Digital Logic controls circuit that error voltage coding is formed to its treatment.Digital Logic control electricity
Road judges whether to need to carry out coarse adjustment according to the coding, just using the thin tuning of analog form if not needing, this
Regulation terminates；Next step is put into if necessary to coarse adjustment.Thin tuning is first turned off below, starts the coarse adjustment of digital form, warp
The treatment that Digital Logic controls circuit is crossed, the break-make of output control word control electric current source array changes output current, and LDO's is thick
Regulation is until error voltage terminates less than after a certain designated value.Start the thin tuning of analog form after coarse adjustment section end, this
Regulation terminates.Under clock control, LDO output currents regulation process can be regularly carried out, it is also possible to encode according to error voltage
Numerical value triggering Digital Logic control circuit, start regulation process.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
Should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (5)
1. a kind of low pressure difference linear voltage regulator, output voltage is VOUT, load resistance RLWith load capacitance CLAnd it is connected in VOUTWith
Between GND, by sampling resistor RF1With resistance RF2To VOUTPartial pressure sampling is carried out, feedback voltage V is obtainedF, VFAnd reference voltage
VREFAnalog output voltage V is obtained after error amplifier compares amplificationC, it is characterised in that VCGiven slightly by a branch road
Circuit is adjusted, fine tuning circuit is given by another branch road, the coarse tuning circuit is used for the break-make of control electric current source array, described thin
Adjust the output connection adjustment pipe M of circuit0Grid, current source array forms by some branch circuit parallel connections, for LDO loads provide electricity
Stream, every branch road is in series by current source and switching tube, and coarse tuning circuit is by the break-make of controlling switch pipe come control electric current
The break-make of source array, the adjustment pipe M0With each branch circuit parallel connection of current source array.
2. low pressure difference linear voltage regulator according to claim 1, it is characterised in that the coarse tuning circuit comprising clock, ADC and
Digital Logic controls circuit, clock circuit to provide clock signal, V to ADC and Digital Logic control circuitCInput coarse adjustment control mould
ADC is first passed through after block and is transformed to data signal, be then passed to Digital Logic control circuit, Digital Logic controls the output control of circuit
The break-make of current source array breaker in middle pipe processed.
3. low pressure difference linear voltage regulator according to claim 1, it is characterised in that the Digital Logic controls circuit to fine tuning
Circuit is enabled, reset control.
4. low pressure difference linear voltage regulator according to claim 1, it is characterised in that current source in the current source array
Grid provides bias voltage by biasing circuit.
5. low pressure difference linear voltage regulator according to claim 1, it is characterised in that when error signal is less than a certain numerical value,
Coarse conditioning process terminates, and starts thin tuning.
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| CN201611104174.8A CN106774587A (en) | 2016-12-05 | 2016-12-05 | A kind of low pressure difference linear voltage regulator |
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| CN201611104174.8A CN106774587A (en) | 2016-12-05 | 2016-12-05 | A kind of low pressure difference linear voltage regulator |
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| CN201611104174.8A Pending CN106774587A (en) | 2016-12-05 | 2016-12-05 | A kind of low pressure difference linear voltage regulator |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107977037A (en) * | 2017-11-17 | 2018-05-01 | 合肥鑫晟光电科技有限公司 | A kind of low-dropout regulator and its control method |
| CN108388301A (en) * | 2018-02-11 | 2018-08-10 | 北京时代民芯科技有限公司 | A kind of anti-single particle reinforces digital low pressure difference linear voltage regulator and control method |
| WO2019033304A1 (en) * | 2017-08-16 | 2019-02-21 | 华为技术有限公司 | Voltage regulation circuit |
| CN109753099A (en) * | 2018-12-21 | 2019-05-14 | 西安电子科技大学 | A kind of digital simulation dual-loop low dropout regulator |
| CN110311555A (en) * | 2019-05-30 | 2019-10-08 | 芯创智（北京）微电子有限公司 | A kind of digital integration difference type low-pressure linear voltage-stablizer and its control method |
| CN111240389A (en) * | 2020-01-21 | 2020-06-05 | 创领心律管理医疗器械（上海）有限公司 | Linear voltage stabilizer, voltage-stabilized power supply and implantable medical device |
| CN112068630A (en) * | 2020-10-10 | 2020-12-11 | 华南理工大学 | Digital low dropout regulator with quick response |
| CN112416041A (en) * | 2020-11-18 | 2021-02-26 | 海光信息技术股份有限公司 | Digital low dropout regulator, transistor anti-aging method and electronic equipment |
| CN112881775A (en) * | 2021-01-13 | 2021-06-01 | 广东工业大学 | Low-power-consumption high-resolution capacitance measuring circuit |
| WO2022134452A1 (en) * | 2020-12-25 | 2022-06-30 | 海宁奕斯伟集成电路设计有限公司 | Voltage stabilization module and electronic apparatus |
| CN114879796A (en) * | 2022-06-24 | 2022-08-09 | 北京芯格诺微电子有限公司 | Digital-analog mixed low dropout linear voltage regulator capable of realizing output voltage regulation |
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| CN110168894B (en) * | 2017-08-16 | 2020-07-28 | 华为技术有限公司 | Voltage regulating circuit |
| WO2019033304A1 (en) * | 2017-08-16 | 2019-02-21 | 华为技术有限公司 | Voltage regulation circuit |
| CN110168894A (en) * | 2017-08-16 | 2019-08-23 | 华为技术有限公司 | A kind of regulating circuit |
| US10984839B2 (en) | 2017-08-16 | 2021-04-20 | Huawei Technologies Co., Ltd. | Voltage regulation circuit |
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| CN107977037A (en) * | 2017-11-17 | 2018-05-01 | 合肥鑫晟光电科技有限公司 | A kind of low-dropout regulator and its control method |
| CN108388301A (en) * | 2018-02-11 | 2018-08-10 | 北京时代民芯科技有限公司 | A kind of anti-single particle reinforces digital low pressure difference linear voltage regulator and control method |
| CN109753099A (en) * | 2018-12-21 | 2019-05-14 | 西安电子科技大学 | A kind of digital simulation dual-loop low dropout regulator |
| CN110311555B (en) * | 2019-05-30 | 2020-05-26 | 芯创智（北京）微电子有限公司 | Digital integral differential type low-voltage linear voltage stabilizer and control method thereof |
| CN110311555A (en) * | 2019-05-30 | 2019-10-08 | 芯创智（北京）微电子有限公司 | A kind of digital integration difference type low-pressure linear voltage-stablizer and its control method |
| CN111240389A (en) * | 2020-01-21 | 2020-06-05 | 创领心律管理医疗器械（上海）有限公司 | Linear voltage stabilizer, voltage-stabilized power supply and implantable medical device |
| CN112068630A (en) * | 2020-10-10 | 2020-12-11 | 华南理工大学 | Digital low dropout regulator with quick response |
| CN112068630B (en) * | 2020-10-10 | 2021-04-20 | 华南理工大学 | Digital low dropout regulator with quick response |
| CN112416041A (en) * | 2020-11-18 | 2021-02-26 | 海光信息技术股份有限公司 | Digital low dropout regulator, transistor anti-aging method and electronic equipment |
| WO2022134452A1 (en) * | 2020-12-25 | 2022-06-30 | 海宁奕斯伟集成电路设计有限公司 | Voltage stabilization module and electronic apparatus |
| CN112881775A (en) * | 2021-01-13 | 2021-06-01 | 广东工业大学 | Low-power-consumption high-resolution capacitance measuring circuit |
| CN112881775B (en) * | 2021-01-13 | 2022-06-03 | 广东工业大学 | Low-power-consumption high-resolution capacitance measuring circuit |
| CN114879796A (en) * | 2022-06-24 | 2022-08-09 | 北京芯格诺微电子有限公司 | Digital-analog mixed low dropout linear voltage regulator capable of realizing output voltage regulation |
| CN114879796B (en) * | 2022-06-24 | 2022-10-21 | 北京芯格诺微电子有限公司 | Digital-analog mixed low dropout linear voltage regulator capable of realizing output voltage regulation |
| WO2023246269A1 (en) * | 2022-06-24 | 2023-12-28 | 北京芯格诺微电子有限公司 | Digital-analog hybrid low dropout regulator capable of realizing output voltage regulation |
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Application publication date: 20170531 |