CN103795416A - High-precision digital to resolving convertor - Google Patents
High-precision digital to resolving convertor Download PDFInfo
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- CN103795416A CN103795416A CN201410068480.5A CN201410068480A CN103795416A CN 103795416 A CN103795416 A CN 103795416A CN 201410068480 A CN201410068480 A CN 201410068480A CN 103795416 A CN103795416 A CN 103795416A
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Abstract
The invention provides a high-precision digital to resolving convertor. The convertor is composed of a voltage reference source, a reference source, a high-precision sine and cosine function fitting device, a high-precision D/A convertor and a data latching device. A 16-bit digital signal is inputted and converted into a resolving signal. The converter mainly has the advantages that by means of a high-performance operational amplifier and a K function linear alternative method, high-precision digital-resolving signal conversion is achieved through a special integrated circuit, and meanwhile good working temperature characteristics are achieved. The operational amplifier with high gain, a large common mode working range, an AB class extension output structure and low null position detuning is obtained through a high-performance operational amplifier design technology, and precision calculation and low distortion detuning are achieved. By means of the connecting resistor elimination technology, system accuracy is improved and temperature character drifting is reduced. A small number of peripheral devices are used for conversion from the digital signal to the resolving signal, and the high-precision digital to resolving convertor is high in precision and low in temperature drifting and meanwhile has certain current driving capacity.
Description
Technical field
The present invention belongs to ASIC Design (ASIC) field, and particularly a kind of high accuracy number is to resolving transducer.
Background technology
Synchronously/resolve-digital quantizer is with numeral-to resolve transducer be two large core devices in modern shaft angle electronics converter technique, can be respectively shaft angle analoglike signal (synchronous Synchro or resolve Resolver) be converted in real time to digital angle signal and converts in real time digital angle signal to shaft angle analoglike signal, be widely used in space flight, aviation, radar, fire control and industrial automation.The integrated circuit that this two large class transducer adopts is its real core.
Have at present the application-specific integrated circuit (ASIC) of synchronous/resolve-digital quantizer both at home and abroad, but numeral-resolving the application-specific integrated circuit (ASIC) field of transducer domestic is complete blank, external numeral-resolve transducer adopts the mode of homemade multichip integrated circuit and components and parts assembling, its inner integrated circuit adopting does not have any disclosed technical documentation and for sale, is difficult to copy for its technology and assembly model.Transducer volume is large, discrete device is many, resolution is only 12 and 14 for the numeral of domestic development-resolve, and the highest dwell angle precision is 4 jiaos points.
Summary of the invention
Technical problem to be solved by this invention is for the deficiencies in the prior art, the numeral of a kind of high accuracy, Low Drift Temperature is proposed to resolving transducer, it can, with the peripheral components of minority, realize numeral to the conversion of resolving signal, its precision is high, temperature float low, have certain current driving ability simultaneously.
Technical problem to be solved by this invention is to realize by following technical scheme.The present invention is that a kind of high accuracy number is to resolving transducer, be characterized in: this transducer is made up of voltage-reference, reference source, high accuracy sin cos functions matching device, high-precision d/a converter and data latches, realize 16 position digital signal inputs are converted to and resolve signal;
Described data latches and high accuracy sin cos functions matching device, high-precision d/a converter three are connected to each other, data latches is converted into 16 position digital signals of outside input the control signal of high accuracy sin cos functions matching device and high-precision d/a converter needs, control the switch of both inside, and latch function is provided; High-precision d/a converter provides high accuracy sin cos functions matching device high 4 resolve analog signal as with reference to signal, the control signal that data latches provides is as digital quantity, carry out linear D/A conversion, generate low 12 resolve analog signal and feed back to high accuracy sin cos functions matching device;
High accuracy sin cos functions matching device provides the reference signal of outside input switching signal according to data latches, produce high 4 and resolve analog signal, and low 12 of combined high precision D/A converter feedback resolve analog signal, fit to 16 and resolve analog signal;
Voltage-reference is connected with high-precision d/a converter with high accuracy sin cos functions matching device with reference source, for operational amplifier and other analog circuits of its inside provide temperature to float little bias current.
Technical problem to be solved by this invention can also further realize by following technical scheme.Above-described high accuracy number, to resolving transducer, is characterized in: this transducer adopts single chip integrated mode, only with a small amount of debugging resistance or precision resistance network, realizes high accuracy number to the conversion of resolving signal in outside; Adopt function method of substitution, with the output of operational amplifier computing combination matching high accuracy sin cos functions; Adopt star-like connection to optimize topological structure method, eliminate and connect precision and the temperature drift effects of conductor resistance to high accuracy sin cos functions matching device; Adopt high performance operational amplifier, reduce all kinds of distortions imbalances of circuit because load, signal swing, the generation of zero-bit imbalance factor; Adopt the current reference source of temperature-compensating, realize Low Drift Temperature.
Technical problem to be solved by this invention can also further realize by following technical scheme.Above-described high accuracy number, to resolving transducer, is characterized in: this transducer adopts BiCMOS or BCDMOS technique, use single chip integrated mode, discrete device numeral to resolving function single-chip or adding the realization of part peripheral components; In the time that accuracy requirement is low, all functions module realizes with monolithic, as 12 below precision; In the time that accuracy requirement is high, the precision resistance network of the precision resistance network in high accuracy sin cos functions matching device, high-precision d/a converter is placed on to application-specific integrated circuit (ASIC) outside and realizes.
Technical problem to be solved by this invention can also further realize by following technical scheme.Above-described high accuracy number, to resolving transducer, is characterized in: this transducer adopts function method of substitution, with the output of operational amplifier computing combination matching high accuracy sin cos functions; Its high accuracy sin cos functions matching device is made up of high 4 rough segmentation circuit, K function replacement circuit, sine and cosine plus-minus circuit; High 4 rough segmentation circuit adopt the multiple signals of the control switch of precision resistance dividing potential drop, anti-phase and high 4 controls to choose, and obtain R
fsin α and R
fhigh 4 of cos α two-way resolves analog signal; K function replacement circuit and sine and cosine plus-minus circuit substitute trigonometric function K with linear function K ' and obtain R
fsin(alpha+beta) and R
fcos(alpha+beta) approximation, realize high accuracy number to the conversion of resolving.
Technical problem to be solved by this invention can also further realize by following technical scheme.Above-described high accuracy number is to resolving transducer, be characterized in: this transducer adopts high performance operational amplifier designing technique to obtain high-gain, large common mode working range and has AB class expansion export structure and the operational amplifier of low zero-bit imbalance, realizes accurate calculating and low distortion imbalance.
Technical problem to be solved by this invention can also further realize by following technical scheme.Above-described high accuracy number, to resolving transducer, is characterized in: this transducer adopts the current reference source of temperature-compensating, and near realization and independent of power voltage and 300K, temperature is floated the reference current output that approaches zero, has low temperature and floats and wide operating temperature range.
Below technical scheme of the present invention is further detailed.
When transducer of the present invention adopts BiCMOS technique, can possess high accuracy and the CMOS technique low energy logic feature of bipolar technology simultaneously, adopt Top-Down, design has the module of standalone feature, and according to main performance index requirement, according to certain design capacity, each index is assigned to corresponding module and gets on.
Transducer of the present invention adopts high performance operational amplifier and precision resistance network, realizes high-precision signal conversion; Adopt the topological structure of optimizing to reduce and eliminate the impedance that is connected wire; Adopt unity gain buffer Isolation input output impedance and hindrance; Adopt distribution ground wire, will participate in the reference ground wire independent wiring of computing, avoid signal ground and other to have crosstalking on the ground wire that electric current passes through; Adopt high accuracy sin cos functions matching device, with the alternative trigonometric function of linear function, reduce the systematic error of digital-to-analogue conversion.
The high performance operational amplifier of transducer of the present invention meets high-gain, large common-mode input range, High-current output and low zero-bit offset voltage simultaneously.For improving circuit gain, adopt Foldable cascade structure, improve DC current gain; Adopt rail-to-rail In-put design, adopt gain matching technique, reduce common mode input and change the change in gain causing, improve common-mode input range; Adopt cross-couplings quadruple modular structure, make output device for AB class output characteristic, High-current output ability is provided; Select optimization topological structure, reduce components and parts number, adopt domain matching technique, coupling device adopts cross-couplings design, reduces mismatch, lowers zero-bit offset voltage.
The high precision resistance network of the precision resistance network using Low Drift Temperature characteristic of transducer of the present invention, resistance device is chosen same material and technique, makes it possess close temperature drift characteristic.On sheet, resistance adopts overriding film resistor technique on line, utilizes on sheet and trims technology, realizes precision resister and coupling.Adopt unit resistance matching technique, increase circuit impedance coupling.Adopt symmetrical electric resistance structure, connect its wire, design identical width, length and cross number of perforations, guarantee to connect wire impedance and also all mate.
How transducer of the present invention, because all wires, connecting line and switch all have impedance and temperature is floated, reduces and eliminates contact resistance, can effectively improve system accuracy and reduce temperature characterisitic drift.Main is to adopt the topological structure of star-like connection, the resistance of wire is counted to the input and output impedance of operational amplifier but not participates in computing, can effectively reduce contact resistance.
In transducer of the present invention, the interchange of input (or direct current) reference analog signal R
fthrough analogue multiplication conversion and the digital multiplication conversion of high accuracy sin cos functions matching device, realize second-order linearity function and substitute trigonometric function, obtain the numeral of high accuracy, low systematic error-resolve signal conversion.Utilize the linearity of linear D/A converter to export the non-linear formula substituting in trigonometric function, reduce nonlinearity erron.High accuracy sin cos functions matching device can be divided into high 4 22.5 degree rough segmentation circuit, K function replacement circuit, sine and cosine plus-minus circuit.High 4 22.5 degree rough segmentation circuit adopt the multiple signals of the control switch of precision resistance dividing potential drops, anti-phase and high 4 controls to choose, and obtain R
fsin α and R
fcos α two-way analog signal.Wherein α meets equation (1).By equation (1) and (2), know that α and β have represented respectively high 4 and the low 12 parallactic angle degree of input digital angle.Spend rough segmentation circuit as shown in Figure 1, input reference signal R for high 4 22.5
fobtain respectively R through precision resistance dividing potential drop
fsin (22.5 °), R
fsin (45 °) and R
fthe signal of sin (67.5 °), adds R
fsignal and ground, obtain R
fthe signal (n=0,1,2,3,4) of sin (n × 22.5 °), switch sample circuit is sampled to it, then isolates with unit gain active circuit.Isolation signals is carried out anti-phase and switch sampling processing, obtains R
fsin α and R
fcos α two-way analog signal.Sine and cosine plus-minus circuit is also made up of high performance operational amplifier and high precision resistance network, and circuit diagram respectively as shown in Figure 2,3.Realize respectively expression formula (6) and (7).K function replacement circuit is made up of high performance operational amplifier and high precision resistance network, and circuit diagram as shown in Figure 4.Order input angle θ=alpha+beta, can obtain identity (3), wherein K=by sin cos functions relational expression
be a nonlinear function, the first few items of Taylor expansion is formula (4).Take Sine-Fitting circuit as example, it is input as the output X of sin θ, sin α, 12 D/A × (m/4096)
2, output voltage is X, output is solved to formula (5).Sine and cosine is added and subtracted to circuit and realize expression formula (6) and (7) substitution respectively, alternative functions K ' can be expressed as formula (8), with K function ratio, both carry out Taylor polynomial expansion at zero point, obtain in front 4 coefficients first and third and are zero.Choose suitable A, B value, can make systematic error minimum.
Formula:
α= n×22.5°，n=0，1，2，…，15………….………………………….(1)
β=m×0.0055°，m=0，1，2，…，2
12-1 …..……………………….….(2)
X=
………………...………………....…………...…………….(5)
Transducer of the present invention can be divided each module region according to entire system performance, power consumption, area requirements.Determine the basic parameter such as device operation current and width length according to technique and minimum dimension.Utilize candence software to carry out emulation and adjustment and carry out layout design and rule inspection.
The overall work principle of transducer of the present invention is that the reference signal of input is sampled, carry out signal electing by Digital Signals switch and participate in calculating and carrying out D/A conversion, with the alternative trigonometric function of linear function, and utilize high performance operational amplifier and precision resistance network to realize high-precision D/R conversion.Resolving signal is a kind of synchronous cosine and sine signal.Precision resistance network chosen by the high 4 position digital signal control simulation switches of input and amplifier obtains the cosine and sine signal R of high 4
fsin α and R
fcos α.K function replacement circuit and sine and cosine plus-minus circuit substitute trigonometric function K with second-order linearity function K ' and obtain R
fsin(alpha+beta) and R
fcos(alpha+beta) approximation.Wherein K function replacement circuit has been used the Output rusults of 12 high-precision d/a converters.It is integrated in voltage-reference, reference source, high accuracy sin cos functions matching device, high-precision d/a converter, data latches on one single chip, realize digital quantity and resolve signal conversion to sine and cosine, adopt high performance operational amplifier designing technique and contact resistance technology for eliminating to realize high-precision conversion, have the advantages that volume is little, precision is high, cost is low.Circuit function principle frame as shown in Figure 5.Systematic error is less than 0.02 jiao point, and emulation schematic diagram as shown in Figure 6.
High performance operational amplifier design can adopt Double_Push(cross-couplings quadruple module) structure.The output stage of Double_Push has adopted the super source follower of cross coupling structure, possesses the export structure of extended attribute, can export very large electric current.It possesses good extend current characteristic and driving force, can not cause large distortion to signal simultaneously, also greatly improved switching rate simultaneously, shortcoming is to adopt transistor size more, and symmetry is not so good, easily causes imbalance, therefore we have designed again various structures, and choose the wherein good a kind of structure of symmetry and, to lower imbalance, in layout design, also the transistor that wherein needs coupling has been carried out to symmetric design in addition.At input, adopt the structure that possesses rail-to-rail input characteristics, and its bias current has been modulated, when input voltage is changed, mutual conductance degenerates and is less than 15% to reduce distortion.
Contact resistance technology for eliminating refers to that the resistance that participates in computing is undertaken by the precision resistance network mating.Because all wires, connecting line and switch all have impedance, how to reduce and to eliminate contact resistance, can effectively improve system accuracy and reduce temperature characterisitic drift.Main is to adopt star-like connection and voltage follower, and the former counts the input and output impedance of operational amplifier by the resistance of wire but not participates in computing, can effectively reduce contact resistance; The latter isolates impact and the elimination switch equivalent resistance of rear class load on prime signal.
Zero temp shift current reference source adopts mirror image boostrap circuit that the bias current of benchmark is provided, and has the characteristic irrelevant with supply voltage, technique etc.Adopt the current source of positive temperature coefficient and the current source of negative temperature coefficient mutually to compensate, the reference current of zero temp shift is provided.This technology can improve the operating temperature range of circuit.
Compared with present technology, transducer major advantage of the present invention is to adopt the linear alternative method of high performance operational amplifier and K function, by high-precision numeral-resolve signal conversion to be realized by application-specific integrated circuit (ASIC), has good working temperature characteristic simultaneously.Adopt high performance operational amplifier designing technique to obtain high-gain, large common mode working range and there is AB class expansion export structure and the operational amplifier of low zero-bit imbalance, realizing accurate calculating and low distortion imbalance.Adopt contact resistance technology for eliminating to improve system accuracy and reduce temperature characterisitic drift.The numeral realizing with monolithic integrated circuit and minority peripheral components of transducer of the present invention is to resolving conversion, not only can reach 16 bit resolutions, dwell angle precision is 2 jiaos points, dwindles greatly numeral-resolve volume and its reliability of raising of transducer simultaneously.
Accompanying drawing explanation
Fig. 1 is high 4 the 22.5 degree rough segmentation circuit diagrams of the present invention;
Fig. 2 is K function replacement circuit figure of the present invention;
Fig. 3 is SIN function plus-minus circuit diagram of the present invention;
Fig. 4 is cosine function plus-minus circuit diagram of the present invention;
Fig. 5 is overall system diagram of the present invention;
Fig. 6 is systematic error distribution schematic diagram of the present invention.
Embodiment
Below further describe concrete technical scheme of the present invention, so that those skilled in the art understands the present invention further, and do not form the restriction to its right.
Described data latches and high accuracy sin cos functions matching device, high-precision d/a converter three are connected to each other, data latches is converted into 16 position digital signals of outside input the control signal of high accuracy sin cos functions matching device and high-precision d/a converter needs, control the switch of both inside, and latch function is provided; High-precision d/a converter provides high accuracy sin cos functions matching device high 4 resolve analog signal as with reference to signal, the control signal that data latches provides is as digital quantity, carry out linear D/A conversion, generate low 12 resolve analog signal and feed back to high accuracy sin cos functions matching device;
High accuracy sin cos functions matching device provides the reference signal of outside input switching signal according to data latches, produce high 4 and resolve analog signal, and low 12 of combined high precision D/A converter feedback resolve analog signal, fit to 16 and resolve analog signal;
Voltage-reference is connected with high-precision d/a converter with high accuracy sin cos functions matching device with reference source, for operational amplifier and other analog circuits of its inside provide temperature to float little bias current.
Embodiment 5, the high accuracy number of embodiment 1-4 described in any one is to resolving in transducer: this transducer adopts high performance operational amplifier designing technique to obtain high-gain, large common mode working range and has AB class expansion export structure and the operational amplifier of low zero-bit imbalance, realizes accurate calculate and low distortion is lacked of proper care.
Claims (6)
1. a high accuracy number is to resolving transducer, it is characterized in that: this transducer is made up of voltage-reference, reference source, high accuracy sin cos functions matching device, high-precision d/a converter and data latches, realize 16 position digital signal inputs are converted to and resolve signal;
Described data latches and high accuracy sin cos functions matching device, high-precision d/a converter three are connected to each other, data latches is converted into 16 position digital signals of outside input the control signal of high accuracy sin cos functions matching device and high-precision d/a converter needs, control the switch of both inside, and latch function is provided; High-precision d/a converter provides high accuracy sin cos functions matching device high 4 resolve analog signal as with reference to signal, the control signal that data latches provides is as digital quantity, carry out linear D/A conversion, generate low 12 resolve analog signal and feed back to high accuracy sin cos functions matching device;
High accuracy sin cos functions matching device provides the reference signal of outside input switching signal according to data latches, produce high 4 and resolve analog signal, and low 12 of combined high precision D/A converter feedback resolve analog signal, fit to 16 and resolve analog signal;
Voltage-reference is connected with high-precision d/a converter with high accuracy sin cos functions matching device with reference source, for operational amplifier and other analog circuits of its inside provide temperature to float little bias current.
2. high accuracy number according to claim 1, to resolving transducer, is characterized in that: this transducer adopts single chip integrated mode, only with a small amount of debugging resistance or precision resistance network, realizes high accuracy number to the conversion of resolving signal in outside; Adopt function method of substitution, with the output of operational amplifier computing combination matching high accuracy sin cos functions; Adopt star-like connection to optimize topological structure method, eliminate and connect precision and the temperature drift effects of conductor resistance to high accuracy sin cos functions matching device; Adopt high performance operational amplifier, reduce all kinds of distortions imbalances of circuit because load, signal swing, the generation of zero-bit imbalance factor; Adopt the current reference source of temperature-compensating, realize Low Drift Temperature.
3. high accuracy number according to claim 1 is to resolving transducer, it is characterized in that: this transducer adopts BiCMOS or BCDMOS technique, use single chip integrated mode, discrete device numeral to resolving function single-chip or adding the realization of part peripheral components; In the time that accuracy requirement is low, all functions module realizes with monolithic, as 12 below precision; In the time that accuracy requirement is high, the precision resistance network of the precision resistance network in high accuracy sin cos functions matching device, high-precision d/a converter is placed on to application-specific integrated circuit (ASIC) outside and realizes.
4. high accuracy number according to claim 1, to resolving transducer, is characterized in that: this transducer adopts function method of substitution, with the output of operational amplifier computing combination matching high accuracy sin cos functions; Its high accuracy sin cos functions matching device is made up of high 4 rough segmentation circuit, K function replacement circuit, sine and cosine plus-minus circuit; High 4 rough segmentation circuit adopt the multiple signals of the control switch of precision resistance dividing potential drop, anti-phase and high 4 controls to choose, and obtain R
fsin α and R
fhigh 4 of cos α two-way resolves analog signal; K function replacement circuit and sine and cosine plus-minus circuit substitute trigonometric function K with linear function K ' and obtain R
fsin(alpha+beta) and R
fcos(alpha+beta) approximation, realize high accuracy number to the conversion of resolving.
5. high accuracy number according to claim 1 is to resolving transducer, it is characterized in that: this transducer adopts high performance operational amplifier designing technique to obtain high-gain, large common mode working range and has AB class expansion export structure and the operational amplifier of low zero-bit imbalance, realizes accurate calculating and low distortion imbalance.
6. high accuracy number according to claim 1 is to resolving transducer, it is characterized in that: this transducer adopts the current reference source of temperature-compensating, near realization and independent of power voltage and 300K, temperature is floated the reference current output that approaches zero, has low temperature and floats and wide operating temperature range.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443176A (en) * | 2016-08-25 | 2017-02-22 | 连云港杰瑞电子有限公司 | Method for converting synchronizing signal or solving signal into positive cosine signal |
| CN107666321A (en) * | 2017-10-17 | 2018-02-06 | 中国电子科技集团公司第四十三研究所 | D/R converter parallel binary angle code two-way orthogonal signalling conversion equipments |
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| GB1410074A (en) * | 1971-12-13 | 1975-10-15 | Int Standard Electric Corp | Simplified digital to sin/cos converter |
| CN102538832A (en) * | 2011-12-23 | 2012-07-04 | 连云港杰瑞电子有限公司 | Digital-shaft angle signal converting method |
| CN102650532A (en) * | 2012-05-18 | 2012-08-29 | 连云港杰瑞电子有限公司 | Method for converting digital signal to synchro/rotary transformer signal |
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2014
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| GB1410074A (en) * | 1971-12-13 | 1975-10-15 | Int Standard Electric Corp | Simplified digital to sin/cos converter |
| CN102538832A (en) * | 2011-12-23 | 2012-07-04 | 连云港杰瑞电子有限公司 | Digital-shaft angle signal converting method |
| CN102650532A (en) * | 2012-05-18 | 2012-08-29 | 连云港杰瑞电子有限公司 | Method for converting digital signal to synchro/rotary transformer signal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443176A (en) * | 2016-08-25 | 2017-02-22 | 连云港杰瑞电子有限公司 | Method for converting synchronizing signal or solving signal into positive cosine signal |
| CN107666321A (en) * | 2017-10-17 | 2018-02-06 | 中国电子科技集团公司第四十三研究所 | D/R converter parallel binary angle code two-way orthogonal signalling conversion equipments |
| CN107666321B (en) * | 2017-10-17 | 2023-10-24 | 中国电子科技集团公司第四十三研究所 | Parallel binary angle code-two-path orthogonal signal conversion device of D/R converter |
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