CN101527467A - Wake-up circuit with automatic digital correction function - Google Patents
Wake-up circuit with automatic digital correction function Download PDFInfo
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- CN101527467A CN101527467A CN200910048795A CN200910048795A CN101527467A CN 101527467 A CN101527467 A CN 101527467A CN 200910048795 A CN200910048795 A CN 200910048795A CN 200910048795 A CN200910048795 A CN 200910048795A CN 101527467 A CN101527467 A CN 101527467A
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Abstract
A wake-up circuit comprises a digital correction circuit, a rectifier, a voltage divider with variable voltage ratio, a simple voltage detection device, a voltage reference independent of temperature and power supply, a voltage comparator and a power switch. The wake-up circuit realizes an energy detection function by voltage detection and realizes wake-up and dormancy control on a system load according to energy intensity of an input signal. The input signal of the wake-up circuit is rectified by the rectifier, and then the rectifier outputs a voltage related to intensity of the input signal; after the voltage is divided by the voltage divider with variable voltage ratio, a signal is output to the simple voltage detection device for voltage detection to control the voltage reference independent of temperature and power supply and a power path of the voltage comparator. When the power path is opened, the voltage comparator detects the voltage signal output by the rectifier again and automatically corrects detection result of the simple voltage detection device by changing output of a digital correction logic circuit. As the digital correction logic circuit is introduced into the wake-up circuit, the wake-up circuit realizes precise voltage detection under a low power dissipation condition.
Description
Technical field
The present invention relates to a kind of integrated circuit (IC) design, specifically, is about the power management in the wireless communication system, is a kind of wake-up circuit structure.
Background technology
Wake-up circuit is a kind of in the electric power management circuit, and it has a wide range of applications in portable electric appts and wireless communication system.Fig. 1 has illustrated wake-up circuit role in wireless communication system, it is the bridge that connects between battery 2 and the system load 3, it starts conducting according to input signal or turn-offs by battery to the supply access the system load, when there is input stimulus in the outside, supply access is switched on, system's operate as normal, and when there is not input stimulus in the outside, wake-up circuit cuts off the supply access of battery 2 to 3 of system loads, make system be in resting state, thereby reduce the load energy consumption of battery 2, played the effect in 2 useful lifes of prolongation battery.In recent years, along with radio sensing network, WLAN (wireless local area network), and the fast development of REID, system complexity is more and more higher, and the importance of wake-up circuit in these low-power dissipation system designs becomes more and more outstanding.
On the one hand, as shown in Figure 1, wake-up circuit 1 is different with other load 3 of system, is one and is working all the time, and need battery 2 to its circuit of powering.Therefore, in order to realize the protection to battery 2 finite energies, the power consumption of wake-up circuit 1 should be much smaller than the power consumption of system load 3.In the such low cost of radio sensing network and radio-frequency identification card is used, more harsh for the requirement of wake-up circuit 1 power consumption.On the other hand, consider the validity of system wake-up and the requirement of spectrum criterion, wake-up circuit 1 need possess high accuracy and highly sensitive characteristic for the detection of input signal.This shows that modern wireless communication systems is to realize high-precision test under the low-power consumption condition for the requirement of wake-up circuit 1.
At present general wake-up circuit 1 has energy measuring to wake up to detect with burst and wakes two kinds up.Wherein, to wake up be by the intensity of system input signal energy being judged, when signal strength signal intensity reaches the demand of stabilized communication, being waken up whole system to energy measuring.And the method that the burst detection wakes up is by a simple modulation sequence is judged, when this sequence satisfies pre-set content, wakes whole system up.Comparatively speaking, the mode that burst detects is had relatively high expectations to circuit complexity, and power consumption is also bigger, is not suitable for using cheaply in enormous quantities.Mode based on energy measuring, circuit structure is simple relatively, and still, the energy measuring circuit of low-power consumption is often relatively responsive to temperature and the system voltage of using environment, bigger change also can take place along with the randomness in the technology manufacturing in its circuit performance, is difficult to realize high-precision requirement.
Summary of the invention
In sum, how realizing that the high accuracy under the low-power consumption condition is waken detection up, is technical problem to be solved by this invention, for this reason, the object of the present invention is to provide a kind of wake-up circuit structure.It adds the function of automatic figure adjustment in the energy measuring circuit, by the control of certain mains switch, realize high-precisionly under the zero-power condition waking detection up.
Technical solution of the present invention is as follows:
According to a kind of wake-up circuit of the present invention, comprise battery and system load, be characterized in also having:
A. by variable voltage divider and the simple voltage collecting device of rectifier, voltage ratio that connects with circuit successively, and the mains switch K that constitutes with the digital correction logic circuit of the voltage ratio of the variable voltage divider of this voltage ratio of control
1Control structure;
B. by the output of this rectifier and another mains switch K of constituting with voltage comparator that the output of the voltage-reference of temperature and supply independent connects with two input respectively
2Control structure;
C. wherein: described rectifier is transformed into d. c. voltage signal with the input signal energy, and by its signal magnitude, changes the described mains switch K of control
1, K
2Conducting and off state, in order to control described battery, wake up and sleep state thereby control system is in to the voltage-reference of voltage comparator and described temperature and supply independent and the supply access of described system load; Two inputs of described digital correction logic circuit connect the output of this simple voltage check device and voltage comparator respectively, and in conjunction with the characteristic of the voltage-reference of described temperature and supply independent, make input signal detection is had stable high accuracy.
Further, in the described wake-up circuit, its rectifier can adopt bridge rectifier and voltage-doubler rectifier;
The variable voltage divider of its voltage ratio can be a variable resistance, also can be change resistance structure or the voltage divider cascade data selector that is changed the dividing potential drop coefficient by switch;
Its simple voltage check device can be based on the control circuit of transistorized cut-in voltage or threshold value, also can be based on the testing circuit of gun stocks upset level.
Advantage of the present invention is to have low-power consumption and high stable, high-precision characteristics, and particularly the energy intensity for input signal detects, and detection is a zero-power and high-precision, and testing result is insensitive to temperature, manufacturing process and supply voltage.
Description of drawings
Fig. 1 is one and introduces the schematic diagram that wake-up circuit acts in wireless communication system;
Fig. 2 is the circuit theory diagrams that wake-up circuit design that the present invention proposes realizes;
Fig. 3 is a kind of embodiment figure of the wake-up circuit that proposes of the present invention;
Embodiment
Below in conjunction with Fig. 2 and Fig. 3, describe instantiation of the present invention in detail.
As shown in Figure 2, the wake-up circuit of the present invention's proposition comprises digital correction logic circuit 4, rectifier 5, variable voltage divider 6, simple voltage check device 7, the mains switch K of voltage ratio
1Control structure 8, mains switch K
2Control structure 9, voltage comparator 10 and with the voltage-reference 11 of temperature and supply independent.Wherein, rectifier 5 is converted to voltage signal V with the input signal that receives
1, realization is converted into energy intensity the function of the voltage amplitude of direct current.V
2Be V
1Through exporting one road signal, the dividing potential drop coefficient S of voltage divider 6 after voltage divider 6 dividing potential drops
nProvide by digital correction logic circuit 4, then, voltage V
2Be input in the simple voltage check device 7 and carry out voltage detecting, in case surpassed the threshold value of voltage check device 7, the output V of voltage check device 7 when its amplitude
3To turn on the power switch K
1Control structure 8.Mains switch K
1Control structure 8 conductings after, voltage comparator 10 and voltage-reference 11 together power on.Voltage comparator 10 will compare the output voltage V of rectifier 5
1Output V with voltage-reference
RefSize, its comparative result V
4Be used for controlling mains switch K
2Control structure 9, the supply access of control system load 3.
The one side of present embodiment provides the high accuracy energy measuring.From the circuit structure that provides as can be known, the mains switch K of final decision system load 3
2The control signal of control structure 9 turn-on and turn-off are V
1Same V
RefThe result who compares.Because V
RefBeing the output with the voltage-reference 11 of temperature and supply independent, is a stable level that does not change with operational environment, therefore, wake-up circuit described in the present embodiment to wake detection up be accurate and stable.
Present embodiment has been realized the function of digital zero offset capability on the other hand.In the circuit design of reality, simple voltage check device 7 can use the benchmark of the turnover voltage of transistorized threshold voltage or gun stocks as voltage detecting.Because the temperature the when turnover voltage of transistorized threshold voltage and gun stocks can be with semiconductor fabrication process and circuit working changes the detection voltage inaccuracy of this step voltage checkout gear.Yet the dividing potential drop coefficient of voltage divider 6 is automatic digital correction circuit 4 bases voltage comparative result V accurately
4Judged result V at simple voltage check device 7
3The basis on revise back output, so just automatically offset the error that simple voltage check device 7 may exist.
Present embodiment provides a kind of implementation of low-power consumption wake-up circuit on the other hand.For wake-up circuit, low-power consumption is divided into two parts.From the load of input signal, because the output loading of rectifier 5 only has only a voltage divider 5, power consumption may be limited to the order of magnitude of nW.From the load of battery, because in the wake-up circuit that proposes, the supply access that has the voltage comparator 10 of quiescent dissipation and voltage-reference 11 is by mains switch K
1Control structure 8 control, mains switch K when simple voltage check device 7 detects input signal amplitude and surpasses its threshold value only
1Just conductings of control structure 8, and in most cases, voltage comparator 10 and voltage-reference 11 are in resting state, therefore, under resting state, the load of battery is zero.
As shown in Figure 3, in Fig. 3, one 32 voltage divider such as branch such as grade 12 and electrical level selector 13 have constituted the voltage divider 6 of a variable voltage ratio together, and the dividing potential drop coefficient is by the input S of electrical level selector
1-5The signal of this 5 bit decides.Gun stocks 14 has played the effect of simple voltage check device 7.PMOS manages M
S115 and M
S216 have played mains switch K
1, K
2And the effect of their control structure 8-9.Band gap reference 18 is voltage-references 11 that all have nothing to do with temperature and supply voltage, and it provides a reference level to hysteresis comparator 17.Hysteresis comparator 17 has played the effect of voltage comparator 10, and introducing lag function is in order to resist the influence of noise and signal fluctuation.
When input signal is zero, rectifier 5 output voltage V
1Be " 0 " that its arbitrary proportion voltage after partial amplitude also is " 0 ", gun stocks 14 is output as height, mains switch M
S115 turn-off, and band gap reference 18 and hysteresis comparator 17 are not all worked, simultaneously, and mains switch M
S216 also turn-off, and the power path of system load 3 is cut off, and system is in resting state, does not have quiescent dissipation.When having input signal, the output of rectifier 5 no longer is " 0 ", its output voltage V
1Relevant with the intake size, energy is big more, V
1Amplitude high more.Under initial condition, the gating signal S of digital correction logic circuit 4 outputs
1-5A road the highest voltage V of output partial pressure value such as gating 32 voltage dividers such as branch such as grade
D1, make V
2=V
D1At this moment, gun stocks 14 will be according to V
2With its upset level V
mBetween magnitude relationship, if V
2＜V
m, gun stocks 14 is output as low, and PMOS manages M
S115 turn-off, and system load 3 still is in resting state.If V
2＞V
m, gun stocks 14 is output as low, thereby makes PMOS pipe M
S1The power path of band gap reference 18 and hysteresis comparator 17 is opened in 15 conductings.After band gap reference 18 powers on, a reference level V who has nothing to do with supply voltage and circuit working temperature will be generated
Ref, hysteresis comparator 17 is V relatively
1And V
RefBetween magnitude relationship, if V
1＞V
Ref, turn-on power switch M then
S216, opening power 2 is to the power path of system load 3, and whole system is waken up.If V
1＜V
Ref, digital correction logic circuit 4 will change gating signal S
1-5, successively by V
D2To V
D32Gating V
1Partial pressure value, until V
2＜V
m, turn-off M
S1Till 15, thereby the power path of cut-out band gap reference 18 and hysteresis comparator 17 makes power supply 2 not have quiescent dissipation.Simultaneously, because digital correction logic circuit 4 has been corrected the dividing potential drop coefficient of voltage divider according to the comparative result of hysteresis comparator, so, when the intensity of input signal changes rectifier 5 output V
1Amplitude when changing, use the voltage ratio result that gun stocks 14 carries out will be with to use accurate band gap reference 18 and hysteresis comparator 17 to carry out voltage ratio result consistent, thereby under the situation that does not increase the quiescent current power consumption, solved the problem that independent simple voltage check device 7 can't be realized precise voltage detection.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of the present invention.
Claims (4)
1. a wake-up circuit comprises battery (2) and system load (3), it is characterized in that, also has:
A. by variable voltage divider (6) and the simple voltage collecting device (7) of rectifier (5), voltage ratio that connects with circuit successively, and with the digital correction logic circuit (4) of the voltage ratio of the variable voltage divider (6) of this voltage ratio of control the mains switch K of formation
1Control structure (8);
B. by the output of this rectifier (5) and the mains switch K that constitutes with voltage comparator (10) that the output of the voltage-reference (11) of temperature and supply independent connects with two input respectively
2Control structure (9);
C. wherein: rectifier (5) is transformed into d. c. voltage signal with the input signal energy, and by its signal magnitude, changes control mains switch K
1, K
2Conducting and off state,, wake up or sleep state voltage comparator (10) and temperature and the voltage-reference (11) of supply independent and the supply access of system load (3) in order to control battery (2) thereby control system is in; Two inputs of digital correction logic circuit (4) connect the output of simple voltage check device (7) and voltage comparator (10) respectively, and in conjunction with the characteristic of the voltage-reference (11) of temperature and supply independent, make input signal detection is had stable high accuracy.
2. wake-up circuit according to claim 1 is characterized in that, rectifier (5) can adopt bridge rectifier and voltage-doubler rectifier.
3. wake-up circuit according to claim 1 is characterized in that, the variable voltage divider (6) of voltage ratio can be a variable resistance, also can be change resistance structure or the voltage divider cascade data selector that is changed the dividing potential drop coefficient by switch.
4. wake-up circuit according to claim 1 is characterized in that, simple voltage check device (7) can be based on the control circuit of transistorized cut-in voltage or threshold value, also can be based on the testing circuit of gun stocks upset level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910048795A CN101527467A (en) | 2009-04-03 | 2009-04-03 | Wake-up circuit with automatic digital correction function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910048795A CN101527467A (en) | 2009-04-03 | 2009-04-03 | Wake-up circuit with automatic digital correction function |
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| Publication Number | Publication Date |
|---|---|
| CN101527467A true CN101527467A (en) | 2009-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910048795A Pending CN101527467A (en) | 2009-04-03 | 2009-04-03 | Wake-up circuit with automatic digital correction function |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036289A (en) * | 2012-12-10 | 2013-04-10 | 上海空间电源研究所 | Awakening system and awakening control method of probe in deep space exploration |
| CN107851858A (en) * | 2015-07-06 | 2018-03-27 | 三洋电机株式会社 | The discharge control method of battery pack and secondary cell |
| CN109921912A (en) * | 2017-12-12 | 2019-06-21 | 德克萨斯仪器股份有限公司 | Signal-powered energy measuring and wake-up system |
| CN111463799A (en) * | 2020-04-09 | 2020-07-28 | 云南电网有限责任公司电力科学研究院 | Power supply device and power supply method of voltage monitor |
| CN112913285A (en) * | 2018-10-24 | 2021-06-04 | 罗伯特·博世有限公司 | Circuit for processing wake-up signal |
-
2009
- 2009-04-03 CN CN200910048795A patent/CN101527467A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036289A (en) * | 2012-12-10 | 2013-04-10 | 上海空间电源研究所 | Awakening system and awakening control method of probe in deep space exploration |
| CN103036289B (en) * | 2012-12-10 | 2015-01-21 | 上海空间电源研究所 | Awakening system and awakening control method of probe in deep space exploration |
| CN107851858A (en) * | 2015-07-06 | 2018-03-27 | 三洋电机株式会社 | The discharge control method of battery pack and secondary cell |
| CN109921912A (en) * | 2017-12-12 | 2019-06-21 | 德克萨斯仪器股份有限公司 | Signal-powered energy measuring and wake-up system |
| CN112913285A (en) * | 2018-10-24 | 2021-06-04 | 罗伯特·博世有限公司 | Circuit for processing wake-up signal |
| US11849308B2 (en) | 2018-10-24 | 2023-12-19 | Robert Bosch Gmbh | Circuit for processing a wake-up signal |
| CN112913285B (en) * | 2018-10-24 | 2024-02-27 | 罗伯特·博世有限公司 | Circuit for processing wake-up signal |
| CN111463799A (en) * | 2020-04-09 | 2020-07-28 | 云南电网有限责任公司电力科学研究院 | Power supply device and power supply method of voltage monitor |
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Application publication date: 20090909 |