CN107565935A - A kind of circuit for reducing oscillator power consumption - Google Patents
A kind of circuit for reducing oscillator power consumption Download PDFInfo
- Publication number
- CN107565935A CN107565935A CN201710797912.XA CN201710797912A CN107565935A CN 107565935 A CN107565935 A CN 107565935A CN 201710797912 A CN201710797912 A CN 201710797912A CN 107565935 A CN107565935 A CN 107565935A
- Authority
- CN
- China
- Prior art keywords
- circuit
- power consumption
- current
- discharge
- switching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention discloses a kind of circuit for reducing oscillator power consumption, the circuit includes current source, controlling switch, and the current mirror includes M4, M5, M7, a current mirror M6 is set in addition in the current mirror, M6 is connected to M5 drain electrode by switching S3, and bias current is provided for resistance.Disconnected due to switching S3 during electric discharge so that be off at M6, so as to reduce dynamic power consumption.
Description
Technical field
The invention belongs to the technical field of oscillator, RC oscillator techniques more particularly in piece.
Background technology
As the rise of the Internet of things era, intelligent domestic, wisdom health MCU market are increasing, for present people
The healthy lifestyles of pursuit, Human fat balance, kitchen scale part indispensable in being lived into people.Clock generation circuit exists
SoC, MCU field are indispensable modules, and its performance plays vital effect to MCU, SoC chip.Because chip consumes
Electric time long power consumption conference heating, influences chip service life, is particularly important so reducing power consumption.
As patent application 201710110975.3 discloses OSC circuits on a kind of high stability low-power consumption piece, the charge and discharge
Circuit, discharge and recharge, the discharge and recharge of switch controlled electric capacity are carried out to electric capacity by current source；The control circuit, filled described
The level state of discharge circuit output is changed, and produces the final output signal of oscillator, the oscillator output signal is again
Control the switch of switching tube in the charge-discharge circuit；Circuit structure of the present invention is simple, low in energy consumption, can realize output vibration work(
Energy；The current source is by common-source common-gate current mirror come image current, therefore caused electric current I1, I2 stability is high, so that
The frequency of oscillation of OSC circuits is stable；The NMOS tube M13 is decoupling capacitor, can be with stabilized supply voltage so that caused electric current
It is stable, while the frequency of oscillation stability of OSC circuits is improved, noise is low；Present invention eliminates the comparator in original technology and
Control section, and use phase inverter, two input nor gates and rest-set flip-flop, chip occupying area small.This application passes through to electric current
Source carries out charge and discharge control and realizes preservation frequency of oscillation, and so as to reduce power consumption, but it realizes that circuit is complicated, and merely by
Voltage stabilizing realizes that oscillator frequency stabilizing exports, and discharge cycle power consumption does not reduce, and during time use, to the voltage of power supply
Stable is difficult to accomplish, can not meet Improvement requirement of the people to oscillator.
Simplified CMOS earthing capacitance currents control oscillator is as shown in figure 1, a timing capacitor C is alternately connected to and filled
Between electricity, discharge current source.Control electric current IC is mirrored onto M3 to provide discharge current, or is mirrored onto M5 and provides charging electricity
Stream.Assuming that initial situation lower switch S1 is closed, electric capacity is electrically charged, and current source M5 is charged by switching S1 to electric capacity C, until electric capacity
More than one upper limit threshold voltage V of voltage of the upper pole versions of CTH, then control circuit, which disconnects, switchs S1, closure switch S2, and electric capacity is opened
Begin to discharge, electric capacity discharges over the ground by switching S2 and current source M3, when the voltage of electric capacity top crown is less than a lower threshold electricity
Press VTLWhen, it is a complete clock cycle that discharge process, which terminates this, repeats such work.
The oscillator structure built according to standard CMOS relaxation oscillators is as shown in Fig. 2 biasing circuit provides partially
Put electric current and PMOS offer charging current is provided, be mirrored onto NMOS and discharge current is provided, capacitance connection is charging and put
Between electric current source, it is assumed that initial time is charge mode, then current source charges to electric capacity, when charging voltage exceedes threshold value electricity
When pressing VH, discharge switch S2 is opened, and electric capacity starts to discharge, when the voltage on electric capacity is less than a threshold voltage VL, electric capacity
Start to charge up again, this is a complete clock cycle, repeats such work.M5 is constantly in open shape during charging and discharging
State, dynamic power consumption is (2I+2I)/2=2I herein, it can be seen that, current source is in running order all the time during charging and discharging,
So that dynamic power consumption increases.
The content of the invention
Based on this, therefore the primary mesh of the present invention be to provide a kind of circuit for reducing oscillator power consumption, the circuit passes through
Increase on discharge current Yuan Zhi roads and switch, reduce discharge cycle power consumption, so as to reduce the dynamic power consumption of oscillator.
It is to provide a kind of circuit for reducing oscillator power consumption another mesh of the present invention, the circuit realiration is easy, into
This is cheap, and lower power consumption in the case of its normal work.
To achieve the above object, the technical scheme is that：
A kind of circuit for reducing oscillator power consumption, the circuit include current source, controlling switch, and the current mirror includes
M4, M5, M7, it is characterised in that set current mirror a M6, M6 to be connected to M5 drain electrode by switching S3 in the current mirror in addition,
Bias current is provided for resistance.Disconnected due to switching S3 during electric discharge so that be off at M6, so as to reduce dynamic work(
Consumption.
Further, M8 source class, the grid leak short circuit of the M8, there is provided reference voltage are connected below the resistance of M5 drain electrodes connection
A VREF part, VREF=2I*2R+VDS8 during charging, VREF=I*2R+VDS8 during electric discharge.
When S1, S3 are turned on, the cycle is started to charge up, when electric capacity top crown voltage reaches 2I*2R+VDS8, charging terminates, this
When S1, S3 disconnect, S2 conductings, electric capacity discharges over the ground, and when electric capacity top crown voltage reaches I*2R+VDS8, electric discharge terminates.
M1 current mirror is to M2, M3, and M3 is as discharge current source.
During charging：S1, S3 conducting are switched, S2 disconnects, during electric discharge：S1, S3 disconnect, S2 conductings.
The process of realization：Charging process：S1, S3 closure are switched, switch S2 disconnects, and current source M7 is by switching S1 to electric capacity
Charged；Discharge process：Switch S1, S3 to disconnect, when switch S2 is closed, electric capacity is discharged over the ground by current source M3.
Current source M5, M6 electric current flow through resistance during charging, and the electric current for there was only current source M5 during electric discharge flows through electricity
Resistance, current source M6 do not access circuit due to switching S3 disconnection.
The pierce circuit that the present invention is realized, switched by increasing on discharge current Yuan Zhi roads, make discharge cycle power consumption
Reduce, so as to reduce the dynamic power consumption of oscillator.And the circuit realiration is easy, cost is cheap, and in the case of its normal work
Lower power consumption.
Brief description of the drawings
Fig. 1 is the standard CMOS relaxation oscillator structure figures that prior art is implemented.
Fig. 2 is the circuit diagram for the CMOS relaxation oscillators that prior art is implemented.
Fig. 3 is the oscillator structure figure that the present invention is implemented point.
Fig. 4 is that the present invention implements current source current simulation result figure.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Referring to accompanying drawing 3, show the pierce circuit that the present invention is realized, shown in figure, the circuit include current source,
Controlling switch, wherein IC current sources flow through M1, are mirrored to M2, M4 and M2 series connection, and M4 electric current is mirrored onto M5, M6, M7, M5,
M6 provides bias current for resistance.M6 is connected to M5 drain electrode by switching S3 in the current mirror, and bias current is provided for resistance.
Disconnected due to switching S3 during electric discharge so that be off at M6, so as to reduce dynamic power consumption.
M8 source class, the M8 grid leaks short circuit, there is provided reference voltage VREF are connected below the resistance of the M5 drain electrodes connection
A part, VREF=2I*2R+VDS8 during charging, VREF=I*2R+VDS8 during electric discharge.
When S1, S3 are turned on, the cycle is started to charge up, when electric capacity top crown voltage reaches 2I*2R+VDS8, charging terminates, this
When S1, S3 disconnect, S2 conductings, electric capacity discharges over the ground, and when electric capacity top crown voltage reaches I*2R+VDS8, electric discharge terminates.
M1 current mirror is to M2, M3, and M3 is as discharge current source.
Control circuit：Controlling switch S1, S2, S3 state.
During charging：S1, S3 conducting are switched, S2 disconnects, during electric discharge：S1, S3 disconnect, S2 conductings.
The process of realization：Charging process：S1, S3 closure are switched, switch S2 disconnects, and current source M7 is by switching S1 to electric capacity
Charged；Discharge process：Switch S1, S3 to disconnect, when switch S2 is closed, electric capacity is discharged over the ground by current source M3.
Current source M5, M6 electric current flow through resistance during charging, and the electric current for there was only current source M5 during electric discharge flows through electricity
Resistance, current source M6 do not access circuit due to switching S3 disconnection, so charging dynamic power consumption isDynamic work(during electric discharge
Consume and beTotal dynamic power consumption is hereinDynamic power consumption is 2I before pass S3 is not increased, and other road is constant, so as to
Reduce power consumption.
Current source M6 current simulations results are as shown in Figure 4, it is seen that when switching S3 and opening, circuit is in charged state, and M6 is just
Often work, when switching S3 and disconnecting, circuit is in discharge condition, and M6 road electric current is turned off, and realizes the design for reducing power consumption.
Because switch S3 is that PMOS switchs, S3 disconnections, I2 road are switched when switching S3 grid voltages and being high level
Electric current is 0, and S3 closures, M6 road current lead-through electric current I are switched when switching S3 grid voltages and being low level.
In a word, the pierce circuit that the present invention is realized, switched by increasing on discharge current Yuan Zhi roads, make discharge cycle
Power consumption reduces, so as to reduce the dynamic power consumption of oscillator.And the circuit realiration is easy, cost is cheap, and the feelings of its normal work
Lower power consumption under condition.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (2)
1. a kind of circuit for reducing oscillator power consumption, the circuit include current source, controlling switch, the current mirror includes
M4, M5, M7, it is characterised in that set current mirror a M6, M6 to be connected to M5 drain electrode by switching S3 in the current mirror in addition,
Bias current is provided for resistance.
2. the circuit of oscillator power consumption is reduced as claimed in claim 1, it is characterised in that connect below the resistance of M5 drain electrode connections
Connect M8 source class, the grid leak short circuit of the M8, there is provided a reference voltage VREF part, VREF=2I*2R+VDS8 during charging,
VREF=I*2R+VDS8 during electric discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710797912.XA CN107565935B (en) | 2017-09-06 | 2017-09-06 | Circuit for reducing power consumption of oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710797912.XA CN107565935B (en) | 2017-09-06 | 2017-09-06 | Circuit for reducing power consumption of oscillator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107565935A true CN107565935A (en) | 2018-01-09 |
| CN107565935B CN107565935B (en) | 2021-07-02 |
Family
ID=60979544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710797912.XA Active CN107565935B (en) | 2017-09-06 | 2017-09-06 | Circuit for reducing power consumption of oscillator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107565935B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109586689A (en) * | 2018-11-19 | 2019-04-05 | 珠海格力电器股份有限公司 | A kind of oscillator and its chip |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5905412A (en) * | 1997-05-21 | 1999-05-18 | National Semiconductor Corporation | Process compensation method for CMOS current controlled ring oscillators |
| CN102545780A (en) * | 2010-12-23 | 2012-07-04 | 鼎亿数码科技(上海)有限公司 | Biasing circuit of voltage-controlled oscillator |
| CN104143968A (en) * | 2014-07-30 | 2014-11-12 | 深圳市芯海科技有限公司 | On-chip oscillator circuit capable of eliminating control logic delay |
| CN104836544A (en) * | 2015-05-18 | 2015-08-12 | 广州市力驰微电子科技有限公司 | Quartz crystal oscillating circuit with extreme-low power consumption |
| CN105262457A (en) * | 2015-09-24 | 2016-01-20 | 深圳市芯海科技有限公司 | Bias circuit of RC oscillator capable of on-chip and off-chip frequency modulation |
| CN106877863A (en) * | 2017-02-28 | 2017-06-20 | 江苏芯力特电子科技有限公司 | OSC circuits on a kind of high stability low-power consumption piece |
-
2017
- 2017-09-06 CN CN201710797912.XA patent/CN107565935B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5905412A (en) * | 1997-05-21 | 1999-05-18 | National Semiconductor Corporation | Process compensation method for CMOS current controlled ring oscillators |
| CN102545780A (en) * | 2010-12-23 | 2012-07-04 | 鼎亿数码科技(上海)有限公司 | Biasing circuit of voltage-controlled oscillator |
| CN104143968A (en) * | 2014-07-30 | 2014-11-12 | 深圳市芯海科技有限公司 | On-chip oscillator circuit capable of eliminating control logic delay |
| CN104836544A (en) * | 2015-05-18 | 2015-08-12 | 广州市力驰微电子科技有限公司 | Quartz crystal oscillating circuit with extreme-low power consumption |
| CN105262457A (en) * | 2015-09-24 | 2016-01-20 | 深圳市芯海科技有限公司 | Bias circuit of RC oscillator capable of on-chip and off-chip frequency modulation |
| CN106877863A (en) * | 2017-02-28 | 2017-06-20 | 江苏芯力特电子科技有限公司 | OSC circuits on a kind of high stability low-power consumption piece |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109586689A (en) * | 2018-11-19 | 2019-04-05 | 珠海格力电器股份有限公司 | A kind of oscillator and its chip |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107565935B (en) | 2021-07-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107332541B (en) | The RC relaxor that comparator imbalance is offset | |
| CN102045041B (en) | RC oscillator and its implementation | |
| US10727822B2 (en) | Comparator and relaxation oscillator | |
| CN103677047B (en) | LDO fast start circuit | |
| CN103312298A (en) | Relaxation oscillator for increasing frequency-control current linearity | |
| CN107508579B (en) | A kind of electric charge transfer RC relaxor | |
| CN105932983B (en) | A kind of oscillator and power management chip that single channel compares | |
| CN107493097A (en) | Electrifying self-resetting circuit with long resetting time | |
| CN107565935A (en) | A kind of circuit for reducing oscillator power consumption | |
| CN106339025B (en) | A kind of low voltage high-precision band-gap reference circuit applied to Internet of things node | |
| CN109104155A (en) | A kind of flow control relaxation oscillator | |
| CN105187012A (en) | Low-power source sensitivity biasing circuit for oscillator circuit | |
| CN105703712B (en) | High-precision RC oscillator | |
| CN103475338B (en) | A kind of High-precision low-voltage oscillator | |
| CN111277249A (en) | Low-power-consumption relaxation oscillator circuit | |
| CN109787612A (en) | A kind of novel wide scope sub-threshold level shifter circuit | |
| CN110739942B (en) | Power-on reset circuit | |
| CN107196606B (en) | Oscillator | |
| CN102710242B (en) | On-chip power-on reset detection circuit applied to high-frequency phase locked loop (PLL) | |
| CN106026983B (en) | A kind of ring oscillator | |
| CN205666808U (en) | Ring oscillator | |
| CN203522645U (en) | Improved low-voltage oscillator | |
| CN107544601A (en) | A kind of start-up circuit of zero quiescent dissipation | |
| CN114629344B (en) | Triangular modulation wave generation circuit suitable for fixed-frequency Buck spread spectrum mode | |
| Yadav et al. | Power efficient charge pump with dynamic threshold for implantable biomedical transducers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |