CN108880509A - A kind of the extremely low power dissipation timing circuit and clocking method of anti-flow-route and temperature fluctuation - Google Patents
A kind of the extremely low power dissipation timing circuit and clocking method of anti-flow-route and temperature fluctuation Download PDFInfo
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- CN108880509A CN108880509A CN201810407732.0A CN201810407732A CN108880509A CN 108880509 A CN108880509 A CN 108880509A CN 201810407732 A CN201810407732 A CN 201810407732A CN 108880509 A CN108880509 A CN 108880509A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/027—Generators characterised by the type of circuit or by the means used for producing pulses by the use of logic circuits, with internal or external positive feedback
- H03K3/03—Astable circuits
- H03K3/0315—Ring oscillators
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/04—Generating or distributing clock signals or signals derived directly therefrom
- G06F1/14—Time supervision arrangements, e.g. real time clock
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/01—Details
- H03K3/011—Modifications of generator to compensate for variations in physical values, e.g. voltage, temperature
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/01—Details
- H03K3/012—Modifications of generator to improve response time or to decrease power consumption
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Abstract
The present invention discloses a kind of extremely low power dissipation timing circuit of anti-flow-route and temperature fluctuation, including RC ring oscillator, real-time clock crystal oscillator, sample count circuit and deviation calibration circuit, wherein, RC ring oscillator generation theoretic frequency value is the low-frequency clock signal of 2Hz as elapsed time clock source, frequency is that the real-time clock crystal oscillator stage of 32.768KHz samples the 2Hz clock signal of RC ring oscillator, the actual frequency of RC ring oscillator and the deviation of theoretical value are determined by sample count circuit, and timing result is calibrated by deviation calibration circuit.Such alternative tradition RTC timekeeping system of timing circuit structure realizes the timing circuit design of low power consumption high-precision.Invention additionally discloses a kind of extremely low power dissipation clocking methods of anti-flow-route and temperature fluctuation.
Description
Technical field
The invention belongs to electronic clock field of circuit technology, are related to a kind of extremely low power dissipation clocking technique, in particular to a kind of
The extremely low power dissipation timing circuit and clocking method of anti-flow-route and temperature fluctuation.
Background technique
With the fast development of Internet of Things (IoT), sensor technology becomes the important technology of acquisition of information.In wireless sensing
In the application of node, by the constraint of volume, therefore using the limited battery power supply of electricity.Since the distributed areas of node are wide,
Environment is complicated, it is unpractical for carrying out the supplemental node energy by replacement battery, it is therefore desirable to which effective use energy maximizes node
Network morals.
Kilowatt meter reading-out system in wireless sensing node network, since sensor node and aggregation node will not frequently lead to always
News, in a dormant state, but can need real-time clock (RTC) module to be constantly in operating mode, on time during no communication
It wakes up sensor and carries out data processing, it is therefore desirable to low power dissipation design be carried out to elapsed time clock module, use the longevity to extend battery
Life.
High-precision is most basic one of the index of elapsed time clock.When there was only RTC after sensor node enters dormant state
The operation of clock module, when elapsed time clock precision is inadequate, will lead to sensor node cannot be accurately within the preset time by certainly
It is dynamic to wake up, it is unable to complete the communication service with aggregation node.The problem of in view of precision, common timekeeping system use
The real-time clock crystal oscillator of 32.768KHz is determined as clock source, the precision of clock by crystal, in the clock point of second-time
Under resolution, the precision of real-time clock crystal oscillator fully meets the demand of accuracy of timekeeping, it can be achieved that high-precision timing.But in real time
Clock crystal oscillator itself can consume the power consumption of 200nW or more, and timing circuit power consumption is high.In order to realize elapsed time clock circuit
Low power dissipation design, most efficient method are to reduce the frequency of elapsed time clock, and extremely low power consumption may be implemented in RC ring oscillator, but
Its frequency of oscillation can be unable to reach the function of exact timing because the fluctuation of production technology, temperature generates deviation.Therefore it needs to grind
Study carefully low-power consumption, high-precision timekeeping system, realizes high energy efficiency demand.
Summary of the invention
The purpose of the present invention is to provide extremely low power dissipation timing circuit and the timing side of a kind of anti-flow-route and temperature fluctuation
Method, alternative tradition RTC timekeeping system realize the timing circuit design of low power consumption high-precision.
In order to achieve the above objectives, solution of the invention is：
A kind of extremely low power dissipation timing circuit of anti-flow-route and temperature fluctuation, including RC ring oscillator, real-time clock crystal
Oscillator, sample count circuit and deviation calibration circuit, wherein RC ring oscillator generates the low frequency that theoretic frequency value is 2Hz
For clock signal as elapsed time clock source, the real-time clock crystal oscillator stage that frequency is 32.768KHz samples the vibration of RC annular
The 2Hz clock signal for swinging device determines the actual frequency of RC ring oscillator and the deviation of theoretical value by sample count circuit, leads to
Deviation calibration circuit is crossed to calibrate timing result.
Above-mentioned RC ring oscillator forms oscillation rings using odd number current-steering phase inverter, is controlled and is flowed using current mirror
The electric current of every level-one phase inverter is crossed to control the output frequency of RC ring oscillator.
Above-mentioned real-time clock crystal oscillator is made of the quartz crystal that frequency of oscillation is 32.768KHz and start-oscillation circuit,
The frequency of real-time clock crystal oscillator is determined by the frequency of oscillation of quartz crystal.
Above-mentioned sample count circuit is made of sample counter, for real-time clock crystal oscillator to RC ring oscillator
Sample count, count results are the periodicity of real-time clock UART clock.
Above-mentioned deviation calibration circuit is by arithmetic logic unit and register group at arithmetic logic unit is according to sample count electricity
Sampling deviation value is calculated in the sample magnitude and standard sample numerical value on road, and sampling deviation value is converted into time deviation amount,
The time deviation amount is stored in a register；The arithmetic logic unit calibrates current timing time according to time deviation amount,
Obtain accurate timing time.
A kind of extremely low power dissipation clocking method of anti-flow-route and temperature fluctuation, includes the following steps：
Step 1, RC ring oscillator generation theoretic frequency value is the low-frequency clock signal of 2Hz as elapsed time clock source；
Step 2, frequency is the 2Hz of the real-time clock crystal oscillator periodic samples RC ring oscillator of 32.768KHz
Clock signal；
Step 3, sample count circuit counts knot for real-time clock crystal oscillator to RC ring oscillator sample count
Fruit is the periodicity of real-time clock UART clock；
Step 4, deviation calibration circuit determines the actual frequency of RC ring oscillator and the deviation of theoretical value, and to timing knot
Fruit calibration.
In above-mentioned steps 2, RC ring oscillator forms oscillation rings using odd number current-steering phase inverter, using electric current
Mirror control flows through the electric current of every level-one phase inverter to control the output frequency of RC ring oscillator.
In above-mentioned steps 3, the enabled Enable signal of real-time clock crystal oscillator is by sample count circuit control, period
Property triggering enable signal open real-time clock crystal oscillator.
In above-mentioned steps 4, the sample magnitude N's and standard sample numerical value M of deviation calibration circuit counting sample count circuit
Sampling deviation value E=N-M, the time deviation in each RC ring oscillator clock period are E, which is converted into second grade
Time deviation amount Δ t=E × TOSC, wherein TOSCFor the real-time clock UART clock period, according to the time deviation amount
Current timing time is calibrated, accurate timing time is obtained.
After adopting the above scheme, the present invention by using real-time clock crystal oscillator 32.768KHz clock cycle property
The 2Hz elapsed time clock to RC ring oscillator is switched, the clock frequency and theoretic frequency value of actual RC ring oscillator are obtained
Deviation, calibrated, on the one hand realized extremely low with timing time deviation of the deviation calibration circuit to RC ring oscillator
On the other hand timing power consumption inhibits influence of the flow-route and temperature to timing time, it can be achieved that high-precision timing.
Detailed description of the invention
Fig. 1 is the circuit block diagram of timing circuit of the present invention；
Fig. 2 is current-steering RC ring oscillator circuit schematic diagram；
Fig. 3 is real-time clock crystal oscillator to RC elapsed time clock sampling principle figure；
Fig. 4 is the work flow diagram of clocking method of the present invention.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention and beneficial effect are described in detail.
As shown in Figure 1, the present invention provides a kind of extremely low power dissipation timing circuit of anti-flow-route and temperature fluctuation, including RC annular
Oscillator, real-time clock crystal oscillator, sample count circuit and deviation calibration circuit, wherein RC ring oscillator generates reason
By the low-frequency clock signal that frequency values are 2Hz as elapsed time clock source, extremely low timing power consumption, frequency 32.768KHz are realized
Real-time clock crystal oscillator stage sampling RC ring oscillator 2Hz clock signal, pass through sample count circuit determine
The actual frequency of RC ring oscillator and the deviation (deviation is caused due to the fluctuation of production technology, temperature) of theoretical value, pass through
Deviation calibration circuit calibrates timing result, realizes exact timing；Each group is illustrated respectively at component below.
The RC ring oscillator is joined end to end using odd number current-steering phase inverter and forms RC ring oscillation
Device, as shown in Figure 2.Metal-oxide-semiconductor Mn0~Mn9, Mp0~Mp9 form current mirror, voltage VctrlThe electricity of Mn0, Mp0 branch is flowed through in control
Stream, Mn1~Mn9, Mp1~Mp9 respectively and inverter series, are controlled by strictly controlling the operating current of RC ring oscillator
Make the delay T of every level-one phase inverterDAnd then frequency of oscillation is controlled, the RC ring oscillator frequency f of N grades of phase inverter rings outputRC=
1/(2*K*TD).The low in energy consumption of the method consumption of elapsed time clock is generated using RC ring oscillator, generates the low-frequency clock of 2Hz,
The power consumption of 1nW is only consumed, but its actual frequency can generate deviation due to the fluctuation of production technology, temperature.
The real-time clock crystal oscillator, to generate the precision clock of 32.768KHz, as adopting for timekeeping system
Sample calibrates clock.Real-time clock crystal oscillator is made of the quartz crystal that frequency of oscillation is 32.768KHz and start-oscillation circuit, real
The frequency of Shi Shizhong crystal oscillator is determined by the frequency of oscillation of quartz crystal, not by process corner, the deviation effects of temperature.Quartz
Crystal is passive device, has piezoelectric effect, and the effect for the alternating electric field that start-oscillation circuit provides makes quartz crystal generate mechanical vibration
It is dynamic, meet the frequency component of oscillation phase condition and transmitted in the loop with the amplitude increased, the rate of increase is by start-oscillation circuit
Loop gain and the bandwidth of quartz crystal network determine, protect after reaching the natural oscillation frequency 32.768KHz of quartz crystal
Keep steady fixed clock output.
The sample count circuit samples RC ring oscillator for real-time clock crystal oscillator, is counted by sampling
Number device is constituted, and working principle is as shown in Figure 3.Within a clock cycle of RC ring oscillator, with the reality of 32.768KHz frequency
Shi Shizhong crystal oscillator obtains the clock periodicity of real-time clock crystal oscillator to RC ring oscillator periodic samples.
The RC ring oscillator for being 2Hz to frequency theory value, the periodicity M of real-time clock crystal oscillator etc. that sample counter obtains
In 16384, when the clock frequency of RC ring oscillator generates deviation because of the fluctuation of production technology or temperature, sample counter is obtained
To periodicity will become N.
The deviation calibration circuit is by arithmetic logic unit and register group at the exemplary frequency deviation values that acquisition sampling obtains
And it completes to calibrate the clock jitter of RC ring oscillator.When deviation effects of the RC ring oscillator by production technology and temperature
When frequency being caused to change, the sample magnitude N and standard sample numerical value M of sample count circuit are obtained by arithmetic logic unit
The time deviation of sampling deviation value E=N-M, each RC ring oscillator clock period are E, are converted into the second according to the deviation
Time deviation amount Δ t=E × T of gradeOSC, wherein TOSCFor the clock cycle of real-time clock crystal oscillator, the time deviation amount
Storage in a register, then corrects the timing time being stored in register with arithmetic logic unit, when obtaining accurate timing
Between.
In summary, a kind of extremely low power dissipation timing circuit of anti-flow-route and temperature fluctuation of the present invention, using real-time clock crystalline substance
Oscillation body device periodic switch samples the elapsed time clock of RC ring oscillator, obtains the deviation of practical clock and theoretical value, deviation
It calibrates circuit to eliminate the deviation in timing circuit, can calibrate by production technology and temperature deviation to RC elapsed time clock frequency
It influences, to obtain accurate timing result.For a specific chip, the fluctuation of production technology is fixed, therefore
Real-time clock crystal oscillator is first opened before the timing circuit use, continuous sampling is carried out to RC ring oscillator, obtain clock
Deviation, deviation calibration circuit eliminate the time deviation in timing circuit, to eliminate production technology fluctuation to RC ring oscillation
The influence of the elapsed time clock frequency of device；The clock frequency of RC ring oscillator can be deviated by environmental temperature fluctuation, temperature
Variation and time correlation, transition will not be occurred, therefore open real-time clock crystal oscillator pair every a bit of time (10s)
RC ring oscillator is sampled, and obtains the frequency deviation of clock of RC ring oscillator caused by temperature fluctuation, and use deviation
Circuit modifications time deviation is calibrated, influence of the temperature fluctuation to elapsed time clock frequency is eliminated, obtains accurate timing time, work
Process is as shown in Figure 4.Register count simultaneously stores triggering variable count, when reaching 10s, triggers real-time clock crystal oscillation
Device once samples RC ring oscillator, obtains the periodicity N of real-time clock crystal oscillator, utilizes arithmetic logic unit
Count value N and theory count value M are subtracted each other to obtain sample frequency difference E=N-M, which are converted into clock
Deviation Δ t=(N-M)/fOSC, wherein fOSCFor the frequency of real-time clock crystal oscillator, finally again with arithmetic logic unit pair
The timing time being stored in register is calibrated, and accurate timing time is obtained.
The Shi Shizhong present invention generates 2Hz elapsed time clock by using RC ring oscillator, consumes the power consumption of 1nW, and period
Property the elapsed time clock of RC ring oscillator is sampled, is calibrated using real-time clock crystal oscillator, consume 20nW's every time
Power consumption, the enabled Enable signal of real-time clock crystal oscillator is by sample count circuit control, every 10 seconds triggering enable signals
Real-time clock crystal oscillator is opened, compared to, as meter, lower power consumption 85% is realized using real-time clock crystal oscillator
Extremely low timing power consumption.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (9)
1. a kind of extremely low power dissipation timing circuit of anti-flow-route and temperature fluctuation, it is characterised in that：Including RC ring oscillator, in real time
Clock crystal oscillator, sample count circuit and deviation calibration circuit, wherein RC ring oscillator generates theoretic frequency value and is
As elapsed time clock source, the real-time clock crystal oscillator stage that frequency is 32.768KHz samples the low-frequency clock signal of 2Hz
The 2Hz clock signal of RC ring oscillator determines the actual frequency and theoretical value of RC ring oscillator by sample count circuit
Deviation, by deviation calibration circuit to timing result calibrate.
2. a kind of extremely low power dissipation timing circuit of anti-flow-route and temperature fluctuation as described in claim 1, it is characterised in that：It is described
RC ring oscillator forms oscillation rings using odd number current-steering phase inverter, flows through every level-one reverse phase using current mirror control
The electric current of device controls the output frequency of RC ring oscillator.
3. a kind of extremely low power dissipation timing circuit of anti-flow-route and temperature fluctuation as described in claim 1, it is characterised in that：It is described
Real-time clock crystal oscillator is made of the quartz crystal that frequency of oscillation is 32.768KHz and start-oscillation circuit, real-time clock crystal
The frequency of oscillator is determined by the frequency of oscillation of quartz crystal.
4. a kind of extremely low power dissipation timing circuit of anti-flow-route and temperature fluctuation as described in claim 1, it is characterised in that：It is described
Sample count circuit is made of sample counter, for real-time clock crystal oscillator to RC ring oscillator sample count, meter
Number result is the periodicity of real-time clock UART clock.
5. a kind of extremely low power dissipation timing circuit of anti-flow-route and temperature fluctuation as described in claim 1, it is characterised in that：It is described
Deviation calibration circuit is by arithmetic logic unit and register group at, arithmetic logic unit according to the sample magnitude of sample count circuit
Sampling deviation value is calculated with standard sample numerical value, and sampling deviation value is converted into time deviation amount, the time deviation amount
Storage is in a register；The arithmetic logic unit calibrates current timing time according to time deviation amount, is accurately counted
When the time.
6. a kind of extremely low power dissipation clocking method of anti-flow-route and temperature fluctuation, it is characterised in that include the following steps：
Step 1, RC ring oscillator generation theoretic frequency value is the low-frequency clock signal of 2Hz as elapsed time clock source；
Step 2, frequency is the 2Hz clock of the real-time clock crystal oscillator periodic samples RC ring oscillator of 32.768KHz
Signal；
Step 3, for real-time clock crystal oscillator to RC ring oscillator sample count, count results are sample count circuit
The periodicity of real-time clock UART clock；
Step 4, deviation calibration circuit determines the actual frequency of RC ring oscillator and the deviation of theoretical value, and to timing result school
It is quasi-.
7. a kind of extremely low power dissipation clocking method of anti-flow-route and temperature fluctuation as claimed in claim 6, it is characterised in that：It is described
In step 2, RC ring oscillator forms oscillation rings using odd number current-steering phase inverter, is flowed through using current mirror control every
The electric current of level-one phase inverter controls the output frequency of RC ring oscillator.
8. a kind of extremely low power dissipation clocking method of anti-flow-route and temperature fluctuation as claimed in claim 6, it is characterised in that：It is described
In step 3, the enabled Enable signal of real-time clock crystal oscillator is by sample count circuit control, the enabled letter of periodic triggers
Number unlatching real-time clock crystal oscillator.
9. a kind of extremely low power dissipation clocking method of anti-flow-route and temperature fluctuation as claimed in claim 6, it is characterised in that：It is described
In step 4, the sampling deviation value E=of the sample magnitude N and standard sample numerical value M of deviation calibration circuit counting sample count circuit
N-M, the time deviation in each RC ring oscillator clock period are E, which is converted into the time deviation amount of second grade
Δ t=E × TOSC, wherein TOSCFor the real-time clock UART clock period, current meter is calibrated according to the time deviation amount
When the time, obtain accurate timing time.
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| CN201810407732.0A CN108880509A (en) | 2018-05-02 | 2018-05-02 | A kind of the extremely low power dissipation timing circuit and clocking method of anti-flow-route and temperature fluctuation |
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Cited By (4)
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| CN111352023A (en) * | 2020-03-27 | 2020-06-30 | 歌尔股份有限公司 | Crystal oscillator detection method and device and computer readable storage medium |
| CN112327596A (en) * | 2021-01-04 | 2021-02-05 | 南京芯视界微电子科技有限公司 | Clock system for single photon detection chip and calibration method thereof |
| CN112737574A (en) * | 2020-11-30 | 2021-04-30 | 珠海格力电器股份有限公司 | Timing calibration method of chip internal clock source and related device |
| CN114200815A (en) * | 2021-11-15 | 2022-03-18 | 秦佳电气有限公司 | Method and system for improving timing precision of common timer |
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Cited By (7)
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| CN111352023A (en) * | 2020-03-27 | 2020-06-30 | 歌尔股份有限公司 | Crystal oscillator detection method and device and computer readable storage medium |
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| CN112737574A (en) * | 2020-11-30 | 2021-04-30 | 珠海格力电器股份有限公司 | Timing calibration method of chip internal clock source and related device |
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| CN112327596A (en) * | 2021-01-04 | 2021-02-05 | 南京芯视界微电子科技有限公司 | Clock system for single photon detection chip and calibration method thereof |
| CN112327596B (en) * | 2021-01-04 | 2021-04-13 | 南京芯视界微电子科技有限公司 | Clock system for single photon detection chip and calibration method thereof |
| CN114200815A (en) * | 2021-11-15 | 2022-03-18 | 秦佳电气有限公司 | Method and system for improving timing precision of common timer |
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Application publication date: 20181123 |