CN107241099A - Angular transducer signal processing circuit and processing method - Google Patents
Angular transducer signal processing circuit and processing method Download PDFInfo
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- CN107241099A CN107241099A CN201710369076.5A CN201710369076A CN107241099A CN 107241099 A CN107241099 A CN 107241099A CN 201710369076 A CN201710369076 A CN 201710369076A CN 107241099 A CN107241099 A CN 107241099A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/34—Analogue value compared with reference values
- H03M1/38—Analogue value compared with reference values sequentially only, e.g. successive approximation type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
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Abstract
Present invention is disclosed a kind of angular transducer signal processing circuit and processing method, the angular transducer signal processing circuit includes：First sample holding unit, the first digital analog converter, the second sample holding unit, the second digital analog converter, comparator, successive approximation CORDIC logic circuits；First sample holding unit, the second sample holding unit connect sine and cosine analog signal respectively；First sample holding unit is connected with the first digital analog converter, and the second sample holding unit is connected with the second digital analog converter；First digital analog converter, the second digital analog converter connection comparator, comparator connection successive approximation CORDIC logic circuits；Successive approximation CORDIC logic circuits connect the first digital analog converter, the second digital analog converter respectively.Angular transducer signal processing circuit proposed by the present invention, can simplify whole signal processing system, save hardware resource, reduce area and power consumption.
Description
Technical field
The invention belongs to angle sensor technical field, it is related to a kind of angular transducer, more particularly to a kind of angular transducer
Signal processing circuit；Meanwhile, the invention further relates to a kind of processing method of angular transducer signal processing circuit.
Background technology
Magnetic angular sensor is widely used in the fields such as industry, automobile, household electrical appliances, robot, can be various for detecting
The angle information that mechanical structure (rotor in the steering wheel of such as automobile, motor) is rotated.Typical magnetic angular sensor is by X
Axle and the magnetic field angle sensing element of Y-axis, amplifier, analog-digital converter and digital signal processing unit composition, as shown in Figure 1.
Wherein, magnetic field angle sensing element produces orthogonal the cosine and sine signal x and y of two-way in extraneous magnetic field rotating.The signal passes through
Digitized cosine and sine signal is converted to by analog-digital converter after amplifier amplification.Digital processing element is calculated usually using CORDIC
Method calculates angle value θ.
Fig. 2 shows a kind of conventional traditional design, i.e., with two-way successive approximation analog-digital converter (SAR-ADC) and in fact
The cosine and sine signal process circuit of the digital circuit composition of existing cordic algorithm.Wherein, successive approximation analog-digital converter is by one
Individual comparator, a digital analog converter and Approach by inchmeal logic unit composition.Wherein digital analog converter typically uses switching capacity
Circuit realiration.The subtraction of input signal and feedback signal is generally embedded in switched-capacitor circuit and realized.Digital analog converter
Need to provide fixed reference voltage Vref.This reference voltage Vref is also successive approximation analog-digital converter (SAR- simultaneously
ADC reference voltage).The core concept of cordic algorithm is also that accurate angle is obtained by successive ignition Approach by inchmeal in fact
Angle value.However, existing signal processing circuit structure is complicated, cost is higher, and power consumption is larger.
In view of this, nowadays in the urgent need to designing a kind of new signal processing circuit, to overcome existing signal transacting electricity
The drawbacks described above that road is present.
The content of the invention
The technical problems to be solved by the invention are：A kind of angular transducer signal processing circuit is provided, can simplify whole
Signal processing system, saves hardware resource, reduces area and power consumption.
In addition, the present invention also provides a kind of processing method of angular transducer signal processing circuit, whole signal can be simplified
Processing system, saves hardware resource, reduces area and power consumption.
In order to solve the above technical problems, the present invention is adopted the following technical scheme that：
A kind of angular transducer signal processing circuit, the angular transducer signal processing circuit includes：First sampling is protected
Hold unit, the first digital analog converter, the second sample holding unit, the second digital analog converter, comparator, successive approximation CORDIC
Logic circuit；
First sample holding unit, the second sample holding unit connect sine and cosine analog signal respectively；First sampling
Holding unit is connected with the first digital analog converter, and the second sample holding unit is connected with the second digital analog converter；First digital-to-analogue turns
Parallel operation, the second digital analog converter connection comparator, comparator connection successive approximation CORDIC logic circuits；Successive approximation
CORDIC logic circuits connect the first digital analog converter, the second digital analog converter respectively；
First sample holding unit, the second sample holding unit by after sampling hold circuit respectively as two ways
The reference voltage of weighted-voltage D/A converter；First number of the input of first digital analog converter also including successive approximation CORDIC logic circuits
Word exports xn；The input of second digital analog converter also includes the second numeral output y of successive approximation CORDIC logic circuitsn；
There is multiplication relation, i.e. the first digital analog converter in the reference voltage and numeral output of first digital analog converter
Numeral output is x*yn, the numeral output of the second digital analog converter is y*xn；X and y are respectively the first sample holding unit, second
The sine and cosine analog signal of sample holding unit input；
The concrete methods of realizing of successive approximation CORDIC logic circuits is as follows：
Step S1, setting initial angle angle value are θ0=0 °, the phasor coordinate value (x corresponding to it0, y0) it is (1,0)；
Step S2, according to following formula to θn(xn, yn), n=1,2,3 ..., it is iterated；Wherein add and subtract symbol
Selection is determined according to the output result of comparator；When comparator exports 0, i.e. x*yn-1<y*xn-1When, xnReduce, ynIncrease, angle
Angle value θnIncrease；Vice versa；
After step S3, iteration n times, θ=θNAs finally calculate obtained angle value；Itself and actual input angle angle value it
Between error depend on iteration times N.
As a preferred embodiment of the present invention, when needing higher precision, increase N value is taken.
A kind of processing method of above-mentioned angular transducer signal processing circuit, it is characterised in that the processing method bag
Include following steps：
Step S1, setting initial angle angle value are θ0=0 °, the phasor coordinate value (x corresponding to it0, y0) it is (1,0)；
Step S2, according to following formula to θn(xn, yn), n=1,2,3 ..., it is iterated；Wherein add and subtract symbol
Selection is determined according to the output result of comparator；When comparator exports 0, i.e. x*yn-1<y*xn-1When, xnReduce, ynIncrease, angle
Angle value θnIncrease；Vice versa；
After step S3, iteration n times, θ=θNAs finally calculate obtained angle value；Itself and actual input angle angle value it
Between error depend on iteration times N.
Existing analog-digital converter and CORDIC are all completed with by Approach by inchmeal, it is possible to there is a kind of improvement
Design combine both, reach and simplify whole signal processing system, save hardware resource, reduce area and the mesh of power consumption
's.
The beneficial effects of the present invention are：Angular transducer signal processing circuit proposed by the present invention, can simplify whole letter
Number processing system, saves hardware resource, reduces area and power consumption.
Compared with classical signal process circuit structure, successive approximation CORDIC process circuits proposed by the present invention are reduced
Following circuit module：In one comparator, two Approach by inchmeal logic modules (SAR logic), former CORDIC logic circuits
Digital multiplier.The reduction of foregoing circuit module can not only reduce the circuit area entirely designed, can also reduce system
Power consumption.Two-way sampling hold circuit in new system typically has operation amplifier circuit realization, it appears that do not have in original system, but
Vref reference voltages actually in traditional structure equally need the drive circuit driving being made up of amplifier.So, finally not
The new circuit module of increase.
Another advantage of successive approximation CORDIC process circuits proposed by the present invention is the reduction of prolonging for whole system
When.In original system as shown in Figure 2, sine and cosine analog signal x and y first have to be converted into data signal by SAR-ADC,
Angle value is calculated by cordic algorithm again.And in new system (as shown in Figure 3), sine and cosine analog signal is directly participated in
CORDIC computings.Iteration twice originally has been simplified to an iteration, so delay than originally reduces half.
In terms of operational precision, new system is suitable with original system.The times N and digital-to-analogue that precision all depends primarily on iteration turn
The matching precision of parallel operation.
Brief description of the drawings
Fig. 1 is a kind of typical magnetic angular sensing system block diagram.
Fig. 2 is the existing angular transducer electricity being made up of two-way successive approximation analog-digital converter and CORDIC processing units
Road.
Fig. 3 is the circuit diagram of successive approximation CORDIC circuits.
Embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
Embodiment one
Referring to Fig. 3, present invention is disclosed a kind of angular transducer signal processing circuit, at the angular transducer signal
Reason circuit includes：First sample holding unit, the first digital analog converter, the second sample holding unit, the second digital analog converter, ratio
Compared with device, successive approximation CORDIC logic circuits；
First sample holding unit, the second sample holding unit connect sine and cosine analog signal respectively；First sampling
Holding unit is connected with the first digital analog converter, and the second sample holding unit is connected with the second digital analog converter；First digital-to-analogue turns
Parallel operation, the second digital analog converter connection comparator, comparator connection successive approximation CORDIC logic circuits；Successive approximation
CORDIC logic circuits connect the first digital analog converter, the second digital analog converter respectively；
First sample holding unit, the second sample holding unit by after sampling hold circuit respectively as two ways
The reference voltage of weighted-voltage D/A converter；First number of the input of first digital analog converter also including successive approximation CORDIC logic circuits
Word exports xn；The input of second digital analog converter also includes the second numeral output y of successive approximation CORDIC logic circuitsn；
There is multiplication relation, i.e. the first digital analog converter in the reference voltage and numeral output of first digital analog converter
Numeral output is x*yn, the numeral output of the second digital analog converter is y*xn；X and y are respectively the first sample holding unit, second
The sine and cosine analog signal of sample holding unit input；
The concrete methods of realizing of successive approximation CORDIC logic circuits is as follows：
Step S1, setting initial angle angle value are θ0=0 °, the phasor coordinate value (x corresponding to it0, y0) it is (1,0)；
Step S2, according to following formula to θn(xn, yn), n=1,2,3 ..., it is iterated；Wherein add and subtract symbol
Selection is determined according to the output result of comparator；When comparator exports 0, i.e. x*yn-1<y*xn-1When, xnReduce, ynIncrease, angle
Angle value θnIncrease；Vice versa；
After step S3, iteration n times, θ=θNAs finally calculate obtained angle value；Itself and actual input angle angle value it
Between error depend on iteration times N.When needing higher precision, increase N value is taken.
The present invention also discloses a kind of processing method of above-mentioned angular transducer signal processing circuit, it is characterised in that institute
Processing method is stated to comprise the following steps：
Step S1, setting initial angle angle value are θ0=0 °, the phasor coordinate value (x corresponding to it0, y0) it is (1,0)；
Step S2, according to following formula to θn(xn, yn), n=1,2,3 ..., it is iterated；Wherein add and subtract symbol
Selection is determined according to the output result of comparator；When comparator exports 0, i.e. x*yn-1<y*xn-1When, xnReduce, ynIncrease, angle
Angle value θnIncrease；Vice versa；
After step S3, iteration n times, θ=θNAs finally calculate obtained angle value；Itself and actual input angle angle value it
Between error depend on iteration times N.
In summary, angular transducer signal processing circuit proposed by the present invention, can simplify whole signal processing system, section
Save hardware resource, reduce area and power consumption.
Compared with classical signal process circuit structure, successive approximation CORDIC process circuits proposed by the present invention are reduced
Following circuit module：In one comparator, two Approach by inchmeal logic modules (SAR logic), former CORDIC logic circuits
Digital multiplier.The reduction of foregoing circuit module can not only reduce the circuit area entirely designed, can also reduce system
Power consumption.Two-way sampling hold circuit in new system typically has operation amplifier circuit realization, it appears that do not have in original system, but
Vref reference voltages actually in traditional structure equally need the drive circuit driving being made up of amplifier.So, finally not
The new circuit module of increase.
Another advantage of successive approximation CORDIC process circuits proposed by the present invention is the reduction of prolonging for whole system
When.In original system as shown in Figure 2, sine and cosine analog signal x and y first have to be converted into data signal by SAR-ADC,
Angle value is calculated by cordic algorithm again.And in new system (as shown in Figure 3), sine and cosine analog signal is directly participated in
CORDIC computings.Iteration twice originally has been simplified to an iteration, so delay than originally reduces half.
In terms of operational precision, new system is suitable with original system.The times N and digital-to-analogue that precision all depends primarily on iteration turn
The matching precision of parallel operation.
Here description of the invention and application be illustrative, be not wishing to limit the scope of the invention to above-described embodiment
In.The deformation and change of embodiments disclosed herein are possible, real for those skilled in the art
The replacement and equivalent various parts for applying example are known.It should be appreciated by the person skilled in the art that not departing from the present invention
Spirit or essential characteristics in the case of, the present invention can in other forms, structure, arrangement, ratio, and with other components,
Material and part are realized.In the case where not departing from scope and spirit of the present invention, embodiments disclosed herein can be entered
The other deformations of row and change.
Claims (3)
1. a kind of angular transducer signal processing circuit, it is characterised in that the angular transducer signal processing circuit includes：The
One sample holding unit, the first digital analog converter, the second sample holding unit, the second digital analog converter, comparator, Approach by inchmeal
Formula CORDIC logic circuits；
First sample holding unit, the second sample holding unit connect sine and cosine analog signal respectively；First sampling is kept
Unit is connected with the first digital analog converter, and the second sample holding unit is connected with the second digital analog converter；First digital analog converter,
Second digital analog converter connects comparator, comparator connection successive approximation CORDIC logic circuits；Successive approximation CORDIC
Logic circuit connects the first digital analog converter, the second digital analog converter respectively；
First sample holding unit, the second sample holding unit after sampling hold circuit respectively as two-way digital-to-analogue by turning
The reference voltage of parallel operation；First numeral of the input of first digital analog converter also including successive approximation CORDIC logic circuits is defeated
Go out xn；The input of second digital analog converter also includes the second numeral output y of successive approximation CORDIC logic circuitsn；
There is the numeral of multiplication relation, i.e. the first digital analog converter in the reference voltage and numeral output of first digital analog converter
It is output as x*yn, the numeral output of the second digital analog converter is y*xn；X and y are respectively the first sample holding unit, the second sampling
The sine and cosine analog signal of holding unit input；
The concrete methods of realizing of successive approximation CORDIC logic circuits is as follows：
Step S1, setting initial angle angle value are θ0=0 °, the phasor coordinate value (x corresponding to it0, y0) it is (1,0)；
Step S2, according to following formula to θn(xn, yn), n=1,2,3 ..., it is iterated；Wherein add and subtract the selection of symbol
Determined according to the output result of comparator；When comparator exports 0, i.e. x*yn-1<y*xn-1When, xnReduce, ynIncrease, angle value
θnIncrease；Vice versa；
After step S3, iteration n times, θ=θNAs finally calculate obtained angle value；It is between actual input angle angle value
Error depends on the times N of iteration.
2. angular transducer signal processing circuit according to claim 1, it is characterised in that：
When needing higher precision, increase N value is taken.
3. a kind of processing method of the angular transducer signal processing circuit described in claim 1, it is characterised in that the processing
Method comprises the following steps：
Step S1, setting initial angle angle value are θ0=0 °, the phasor coordinate value (x corresponding to it0, y0) it is (1,0)；
Step S2, according to following formula to θn(xn, yn), n=1,2,3 ..., it is iterated；Wherein add and subtract the selection of symbol
Determined according to the output result of comparator；When comparator exports 0, i.e. x*yn-1<y*xn-1When, xnReduce, ynIncrease, angle value
θnIncrease；Vice versa；
After step S3, iteration n times, θ=θNAs finally calculate obtained angle value；It is between actual input angle angle value
Error depends on the times N of iteration.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113310396A (en) * | 2021-05-20 | 2021-08-27 | 西安电子科技大学 | Sine and cosine signal amplitude calculation circuit with double sampling structure |
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