CN104197922B - Gyroscope two-phase sampling front-end amplifier and gyroscope signal sampling control method - Google Patents
Gyroscope two-phase sampling front-end amplifier and gyroscope signal sampling control method Download PDFInfo
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- CN104197922B CN104197922B CN201410373278.3A CN201410373278A CN104197922B CN 104197922 B CN104197922 B CN 104197922B CN 201410373278 A CN201410373278 A CN 201410373278A CN 104197922 B CN104197922 B CN 104197922B
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- gyroscope
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- power supply
- clock
- operational amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/56—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
- G01C19/5776—Signal processing not specific to any of the devices covered by groups G01C19/5607 - G01C19/5719
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- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
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Abstract
The invention discloses a gyroscope two-phase sampling front-end amplifier. The gyroscope two-phase sampling front-end amplifier comprises an operational amplifier, a power supply, a first switch pair and a second switch pair, a plurality of charging and discharging devices and a clock source, wherein the operational amplifier is connected with the upper pole plate connection end and the lower pole plate connection end of a gyroscope sensor model circuit; the power supply is connected between the gyroscope sensor model circuit and the operational amplifier; the first switch pair and the second switch pair are connected between the power supply and the operational amplifier; the plurality of charging and discharging devices are arranged in the gyroscope sensor model circuit and the operational amplifier, connected with the power supply and used for charging according to the closing of the first switch pair and discharging according to the closing of the second switch pair. By virtue of the gyroscope two-phase sampling front-end amplifier, the problem that the middle polar plate of the existing gyroscope circuit front-end amplifier cannot be directly connected with the ground can be solved; the gyroscope two-phase sampling front-end amplifier is insensitive to the common mode voltage drift; the error caused by mismatching of reference capacitors can be eliminated; the imbalance and low-frequency noise of the circuit can be reduced. The invention also discloses a signal sampling control method integrated with the gyroscope two-phase sampling front-end amplifier.
Description
Technical field
The present invention relates to gyroscope two-phase sampling front-end amplifier circuit and its signal control principle.
Background technology
High accuracy gyroscope instrument and accelerometer are due in precise navigation, automotive electronics, intelligent robot, Industry Control and disappearing
Take the extensive application in electronic product, and enjoy favor.MEMS gyroscope can be equivalent to a pair dynamic differential variation electric capacity, its
Capacitance variations can reflect the change of measured physical quantity, capacitance change general 10-18~10-12F, the spirit to capacitive readout circuit
Sensitivity, resolution and the range of linearity are proposed more harsh requirement.The middle plate of existing gyroscope is all to connect on the spot
, but power supply V is accessed in existing gyroscope reading circuit front end convert of capacitor to voltage module one enddd, other end ground connection, wherein
Between pole plate can not be directly connected to (as shown in a kind of embodiment of Fig. 1 routine techniquess), middle plate access voltage be Vdd/2
(Vcm), and its great majority be by connect a super large resistance eutral grounding, it is impossible to realization be to improve with being directly connected to real power supply
System stability.
The content of the invention
Present invention seek to address that aforementioned drawback, designs a kind of gyroscope two-phase sampling front-end amplifier, to solve existing top
Spiral shell instrument sensor model circuit front-end amplifier middle plate can not be directly connected to problem on the spot.Put gyroscope front end of the present invention
Big device structure is drifted about insensitive by Double-phase switch mode to common-mode voltage, and can eliminate the mistake of reference capacitance mismatch introducing
Difference, in combination with Correlated Double Sampling, to reduce imbalance and the low-frequency noise of circuit of the present invention.
In order to solve above-mentioned technical problem, the present invention is adopted the following technical scheme that：Gyroscope two-phase sampling front-end amplifier,
It is connected to gyro sensor precircuit, including：Connect the gyro sensor precircuit top crown connection end,
The operational amplifier of bottom crown connection end；It is connected between the gyro sensor precircuit and op amp loop
At least one pair of power supply；First switch between the power supply and op amp loop is arranged in, second switch pair；And set
Multiple charge and discharge electrical parts in being placed in the gyro sensor precircuit and op amp loop, they connect described electricity
Source is simultaneously charged according to the closure of first switch pair and is discharged according to the closure of second switch pair.When it is further included
Zhong Yuan, design the clock source with：Setting second clock T2, first switch is closed at this moment to pass through power supply as charge and discharge electrical equipment
Part is charged, and makes operational amplifier gather the first sampled signal；Set the first clock T1, second switch is closed at this moment to making
Obtain the charge and discharge electrical part to discharge operational amplifier, make operational amplifier gather the second sampled signal, subsequently by it
Difference output end output voltage signal is acted upon to subsequent process circuit.
Further, gyro sensor precircuit is preferably comprised the connection of the top crown in gyroscope gauge outfit
End, middle plate connection end and bottom crown connection end, wherein the middle plate connection end connects on the spot.Wherein top crown connection
The first power supply (V of end connectionH) or second source (VL), the same connection end of the bottom crown connects the first power supply or second source.
Upper and lower pole plate connection end is arranged according to middle plate into symmetrical expression, and potential is zero at middle plate.
Wherein, power supply (including first, second power supply, or two high electronegative potentials that a power supply is provided, such as high electricity
Flat to be set to supply voltage, low level is set to GND Value) switch is provided with and top crown connection end, bottom crown connection end between
It is right, in the first power supply, controlling switch to charge to closing to first, second sensor equivalent capacity, in second source
When, disconnect it is therein a part switch pair and close another part switch it is right so that sensor equivalent capacity is according to second source
The potential difference of offer to late-class circuit discharges electric charge, i.e., discharged according to the inertia force deflection that gyroscope itself is sensed.
In one embodiment, the charge and discharge electrical part includes at least one pair of capacitor.
In one embodiment, described at least one pair of power supply includes providing first voltage VHThe first power supply, and provide the
Two voltage VLSecond source, wherein first power supply is the gyro sensor model by the closure of first switch pair
Circuit, charge and discharge electrical part are charged；The second source accesses charge and discharge electrical part by the closure of second switch pair so that it
Discharge and make operational amplifier produce control voltage.
In one embodiment, a pair of regulated power supplies are further included, it is electric for providing the 3rd for the charge and discharge electrical part
Pressure VU,VD。
In one embodiment, further include that the 3rd switch is right, be coupled in the charge and discharge electrical part and operational amplifier
Between, in the 3rd period of time T of clock source setting2AInside it is able to close and make operational amplifier output reset.
In one embodiment, neutral ground is set on the link circuit of described at least one pair of power supply and operational amplifier
Point, i.e., be grounded setting with the equipotential position of aforementioned middle plate.
Based on aforementioned schemes, the invention also discloses a kind of signal sampling control of integrated gyroscope front-end sampling amplifier
Method, including step：1) second clock T is provided by clock source2, first switch is now controlled to closure, so that first is electric
Source is charge and discharge electrical part, gyro sensor precircuit provides first voltage VHTo be charged；2) by clock source in institute
State the first clock T1Second clock T is provided afterwards2, second switch is now controlled to closure, so that second source is charge and discharge electrical equipment
Part, gyro sensor precircuit provide second voltage VLTo be allowed to be discharged；3) the 3rd clock T is provided2A, now close
3rd switch pair and make operational amplifier output reset；4) electricity is carried out to operational amplifier by tunable capacitor, charge and discharge electrical part
Lotus shifts so that charge signal is converted to voltage control signal and is exported by the operational amplifier.
In one embodiment, the first clock T1, second clock T2With the 3rd clock T2AIt is different.
In one embodiment, step 1) further include step：It is the charge and discharge electrical part by a pair of regulated power supplies
Tertiary voltage V is providedU,VD。
Description of the drawings
Fig. 1 schematically shows a kind of middle plate of routine techniquess and accesses VDDThe gyroscope front-end amplifier of/2 (Vcm)
Circuit theory diagrams；
Fig. 2 generality shows the circuit theory diagrams of the front-end amplifier of the embodiment of the present invention；
The clock signal schematic diagram that Fig. 3 is provided by clock source of the present invention；
Fig. 4 is that front-end amplifier of the present invention is in clock T2Under equivalent circuit diagram；
Fig. 5 is that front-end amplifier of the present invention is in clock T1Under equivalent circuit diagram.
Specific embodiment
With reference to Fig. 2, the middle plate of a gyro sensor precircuit embodiment connects on the spot and with single supply
Power supply, including the top crown connection end S arranged in gyroscope gauge outfittop, middle plate connection end SctrWith bottom crown connection end
Sbot.Wherein, top crown connection end StopConnect the first power supply VH(being set to supply voltage) or second source VL(it is set to power supply ground electricity
Pressure), bottom crown connection end SbotEqually symmetrically connect the first power supply or second source, wherein in top crown connection end StopWith in
Between pole plate connection end SctrBetween.
Further in fig. 2, a two-phase sampling front-end amplifier is connected to gyro sensor precircuit, it compared with
Each connect the top crown connection end S of the gyro sensor precircuit including positive and negative input goodlytop, bottom crown connect
Meet end SbotOperational amplifier A；The power supply being connected between the gyro sensor precircuit and operational amplifier A；Connect
First switch between the power supply and operational amplifier A is to, second switch pair；And charge and discharge electrical part, it is connected to institute
Power supply is stated, and is charged according to the closure of first switch pair and is discharged according to the closure of second switch pair.In fig. 2,
Second switch is to including mutually according to the symmetrically arranged S of transverse center of circuit2u、S2d、S4u、S4d、S7u、S7d、S9u、S9d, first
Switch is to including S1u、S1d、S3u、S3d、S5u、S5d、S6u、S6d、S10u、S10d.And, charge and discharge electrical part include figure shown in
The symmetrically arranged capacitor of each circuit node.
Wherein, top crown connection end StopWith switch S1uConnection, switchs S1uThe other end connection DC voltage VH.Switch S2u
One end and top crown connection end StopConnection, other end connecting valve S3uOne end, switch S4uOne end and capacitor C1u
One end.Switch S3uThe other end connection adjustable voltage Vu；Capacitor C1uThe other end connect on the spot；Switch S4uThe other end
Connecting valve S5uOne end, capacitor C2uOne end, capacitor C3uOne end and capacitor C4uOne end.Switch S5uIt is another
End connection is on the spot.Capacitor C2uOther end connecting valve S6uOne end and switch S7uOne end, switch S6uThe other end connection
Voltage VH, switch S7uThe other end connection voltage VL.Capacitor C3uOther end concatenation operation amplifier A reverse input end and
Switch S8uOne end.Switch S8uOther end connecting valve S9uOne end and operational amplifier A positive outfan Voutp.Electricity
Container C4uOther end connecting valve S9uThe other end and switch S10uOne end.Switch S10uThe other end connection simulation ground.
In one embodiment, middle plate connection end SctrConnection power supply is on the spot.Accordingly, in power supply VH、VLWith fortune
Calculate on the link circuit of amplifier A, i.e. S1uWith S1d、S5uWith S5dBetween earth point is accordingly set, i.e., with aforementioned middle plate
Equipotential position at be grounded setting.
In another embodiment, bottom crown connection end SbotWith switch S1dConnection, switchs S1dThe other end connection voltage
VH.Switch S2dOne end and bottom crown connection end SbotConnection, other end connecting valve S3dOne end, switch S4dOne end and
Capacitor C1dOne end.Switch S3dThe other end connection adjustable voltage Vd；Capacitor C1dThe other end connect on the spot；Switch S4d
Other end connecting valve S5dOne end, capacitor C2dOne end, capacitor C3dOne end and capacitor C4dOne end.Switch
S5dThe other end connect on the spot.Capacitor C2dOther end connecting valve S6dOne end and switch S7dOne end, switch S6d's
The other end connects voltage VH, switch S7dThe other end connection voltage VL.Capacitor C3dOther end concatenation operation amplifier A just
To input and switch S8dOne end.Switch S8dOther end connecting valve S9dOne end and operational amplifier A reverse output
End Voutn.Capacitor C4dOther end connecting valve S9dThe other end and switch S10dOne end.Switch S10dThe other end connection
Simulation ground.
In one embodiment, S is switched2u、S2d、S4u、S4d、S7u、S7d、S9u、S9d(need not in Fig. 2 by a clock source
Show) clock signal T1Control, switchs S1u、S1d、S3u、S3d、S5u、S5d、S6u、S6d、S10u、S10dBy clock signal T2Control
System.And in another embodiment, its breaker in middle S8u、S8dBy clock signal T2AControl.
Fig. 3 is the clock input signal sequential chart of the present invention.Sequential chart from Fig. 3 can be seen that second clock T2It is high
Trailing edge and the first clock T during level1Rising edge there is non-overlapped time I, the 3rd clock T2AWith second clock T2Under
Drop is along with non-overlapped time II, the first clock T1, second clock T2With the 3rd clock T2ALength is different, by analog device
Characteristic determine.
As second clock signal T2For high level when, controlling switch S1u、S1d、S3u、S3d、S5u、S5d、S6u、S6d、S10u、S10d、
S8uAnd S8dIn the conduction state, circuit working state now is equivalent circuit as shown in Figure 4.Now capacitor CS1、CS2、
C2u、C2dConnection VH, start to gather electric charge；Capacitor C1u、C1dConnect adjustable voltage V respectivelyu、Vd, start to gather electric charge；Capacitor
C4u、C4dConnection simulation ground terminal, starts to gather electric charge；So as to capacitor C3u、C3dThe quantity of electric charge keep it is constant；At operational amplifier A
In reset state.
When the first clock signal T1For high level when, controlling switch S2u、S2d、S4u、S4d、S7u、S7d、S9u、S9dIt is on
State, circuit working state now is equivalent circuit as shown in Figure 5.Now, second voltage VLFor 0V, capacitor is accessed,
So that capacitor CS1、CS2、C2u、C2d、C1u、C1d、C4u、C4dThe quantity of electric charge of upper aggregation is in electric discharge, to capacitor C3u、C3dOn
Transfer charge.Charge signal is converted to voltage signal by difference output end V by operational amplifier Aoutp、VoutnOutput.
The embodiment of the present invention only schematically describes technique effect, and its scope required for protection is by claims
What book was limited.
Claims (7)
1. a kind of gyroscope two-phase sampling front-end amplifier, is connected to gyro sensor precircuit, it is characterised in that include：
Connect top crown connection end, the operational amplifier of bottom crown connection end of the gyro sensor precircuit；
At least one pair of power supply being connected between the gyro sensor precircuit and op amp loop；
First switch between the power supply and op amp loop is arranged in, second switch pair；
And the multiple charge and discharge electrical parts in being arranged at the gyro sensor precircuit and op amp loop, charge and discharge
Electrical part connects the power supply and is charged according to the closure of first switch pair and is put according to the closure of second switch pair
Electricity；
Also include clock source, design the clock source with：Setting second clock T2, first switch is closed at this moment to by electricity
Source is charged for charge and discharge electrical part, makes operational amplifier gather the first sampled signal；Set the first clock T1, close at this moment
Second switch pair causes the charge and discharge electrical part to discharge operational amplifier, makes operational amplifier collection the second sampling letter
Number, subsequently it is acted upon to post processing electric circuit by its difference output end output voltage signal；
Described at least one pair of power supply includes providing first voltage VHThe first power supply, and provide second voltage VLSecond source, its
Described in the first power supply be that the gyro sensor precircuit, charge and discharge electrical part fill by the closure of first switch pair
Electricity；The second source charge and discharge electrical part is accessed by the closure of second switch pair so that electric discharge and produce operational amplifier
Control voltage；
The gyro sensor precircuit includes top crown connection end, the middle plate connection end in gyroscope gauge outfit
And bottom crown connection end.
2. gyroscope two-phase sampling front-end amplifier according to claim 1, it is characterised in that：Wherein described middle plate
Connection end connects on the spot, and the top crown connection end and bottom crown connection end are respectively connected to power supply, and paired according to middle plate
Title formula is arranged.
3. gyroscope two-phase sampling front-end amplifier according to claim 1, it is characterised in that：Further include a pair can
Power supply is adjusted, for providing tertiary voltage V for the charge and discharge electrical partU,VD。
4. gyroscope two-phase sampling front-end amplifier according to claim 2, it is characterised in that：In described at least one pair of electricity
Neutral ground point is set on the link circuit of source and operational amplifier, i.e., be grounded at the equipotential position of aforementioned middle plate
Arrange.
5. gyroscope two-phase sampling front-end amplifier according to claim 1, it is characterised in that：Further include that the 3rd opens
It is right to close, and is coupled between the charge and discharge electrical part and operational amplifier, in the 3rd period of time T of clock source setting2AInside it is able to
Close and make operational amplifier reset.
6. a kind of gyroscope signal sampling control method of the gyroscope two-phase sampling front-end amplifier based on claim 5, its
It is characterised by including step：
1) second clock T is provided by clock source2, first switch is now controlled to closure, so that the first power supply is charge and discharge electrical equipment
Part, gyro sensor precircuit provide first voltage VHTo be charged；
2) the first clock T is provided by clock source1, second switch is now controlled to closure, so that second source is charge and discharge electrical equipment
Part, gyro sensor precircuit provide second voltage VLTo be allowed to be discharged；
3) the 3rd clock T is provided2A, now close the 3rd switch pair and make operational amplifier reset；
4) electric charge transfer is carried out to operational amplifier by gyro sensor precircuit, charge and discharge electrical part so that the fortune
Charge signal is converted to voltage control signal and is exported by calculation amplifier；
In step 1) further include：Tertiary voltage V is provided by a pair of regulated power supplies for the charge and discharge electrical partU,VD。
7. gyroscope signal sampling control method according to claim 6, it is characterised in that：The first clock T1, second
Clock T2With the 3rd clock T2ADuration is different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410373278.3A CN104197922B (en) | 2014-07-31 | 2014-07-31 | Gyroscope two-phase sampling front-end amplifier and gyroscope signal sampling control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410373278.3A CN104197922B (en) | 2014-07-31 | 2014-07-31 | Gyroscope two-phase sampling front-end amplifier and gyroscope signal sampling control method |
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| Publication Number | Publication Date |
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| CN104197922A CN104197922A (en) | 2014-12-10 |
| CN104197922B true CN104197922B (en) | 2017-05-17 |
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| CN201410373278.3A Active CN104197922B (en) | 2014-07-31 | 2014-07-31 | Gyroscope two-phase sampling front-end amplifier and gyroscope signal sampling control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111510143A (en) * | 2020-04-03 | 2020-08-07 | 四川知微传感技术有限公司 | Front-end circuit for direct conversion from capacitance to digital quantity |
| CN116545428B (en) * | 2023-07-05 | 2023-09-26 | 成都市晶蓉微电子有限公司 | High-precision capacitance-to-voltage conversion error trimming circuit and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101271125B (en) * | 2008-05-12 | 2011-05-11 | 清华大学 | Capacitance type micro-accelerometer |
| IT1394627B1 (en) * | 2009-06-05 | 2012-07-05 | St Microelectronics Rousset | PASSABANDA FILTER WITH SWITCHED CAPACITORS OF A TIME-DISCRETE TYPE, IN PARTICULAR FOR THE CANCELLATION OF OFFSET AND LOW-FREQUENCY NOISE OF STAGES WITH SWITCHED CAPACITORS |
| CN102297688A (en) * | 2010-06-25 | 2011-12-28 | 中国科学院电子学研究所 | Full-differential capacitance reading circuit for crosswise sampling secondary charge summation |
| EP2428774B1 (en) * | 2010-09-14 | 2013-05-29 | Stichting IMEC Nederland | Readout system for MEMs-based capacitive accelerometers and strain sensors, and method for reading |
| CN204007638U (en) * | 2014-07-31 | 2014-12-10 | 嘉兴市纳杰微电子技术有限公司 | Gyroscope two-phase sampling front-end amplifier |
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