CN105703775A - Integral analog-digital converter and integral analog-digital conversion method - Google Patents
Integral analog-digital converter and integral analog-digital conversion method Download PDFInfo
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Abstract
The embodiment of the invention provides an integral analog-digital converter and an integral analog-digital conversion method. The integral analog-digital converter includes an input module, an amplifier module, a comparison module and an auxiliary module; the amplifier module, the comparison module and the auxiliary module are connected with reference voltage; the input module is used for inputting original signals; the auxiliary module is used for storing auxiliary signals according to the reference voltage; the amplifier module and the auxiliary module jointly perform integration on the auxiliary signals and the original signals so as to generate integral signals; and the comparison module is used for comparing the integral signals with the reference voltage so as to generate conversion signals. According to the integral analog-digital converter and the integral analog-digital conversion method provided by the embodiment of the invention, a circuit of a simple structure is adopted to improve the accuracy of the analog-digital converter.
Description
Technical field
The present invention relates to the technical field of analog digital conversion, particularly relate to a kind of integrating analog to digital converter and one amasss submodular conversion method。
Background technology
Analog-digital converter and A/D converter, or it is called for short ADC (Analog-to-DigitalConverter, analog-digital converter), it is common that refer to that analog-signal transitions is the electronic component of digital signal by one。One input voltage signal can be converted to the digital signal of an output by analog-digital converter。Owing to digital signal itself does not have practical significance, it is merely representative of a relative size。Therefore an analog-digital converter is required for one with reference to analog quantity as the standard changed, relatively common reference standard is maximum convertible signal magnitude, and the digital quantity exported then represents the input signal size relative to reference signal。
In actual applications, the most important parameter of analog-digital converter is the precision of conversion。In order to ensure the accuracy of data processed result, analog-digital converter must have enough conversion accuracies。Although integrating analog to digital converter has the characteristic not being subject to integrating resistor and integrating capacitor process variations influence, but its precision can be subject to integration amplifier noise, comparator noise, switching noise, integration offset voltage, the impact of the factors such as comparator imbalance voltage, in order to improve the precision of analog-digital converter, offset voltage must be eliminated and reduce effect of noise, or increase output area when noise can not reduce。
Therefore, a technical problem that those skilled in the art urgently solve it is presently required exactly: how to propose a kind of integrating analog to digital converter, in order to adopt the circuit of simple in construction, improve the precision of analog-digital converter。
Summary of the invention
Embodiment of the present invention technical problem to be solved is to provide a kind of integrating analog to digital converter, in order to adopt the circuit of simple in construction, improves the precision of analog-digital converter。
In order to solve the problems referred to above, the invention discloses a kind of integrating analog to digital converter, including input module, amplifier module, comparison module and supplementary module, described amplifier module, comparison module and supplementary module connect reference voltage；Wherein,
Input module, is used for inputting primary signal；
Supplementary module, for storing auxiliary signal according to described reference voltage；
Amplifier module, for jointly described auxiliary signal and described primary signal being integrated with described supplementary module, generates integrated signal；
Comparison module, for described integrated signal and reference voltage being compared, generates conversion signal。
Preferably, described input module includes integrating resistor Rint, the first switch S1 and second switch S2, switchs S1 by described first and connects voltage VIN, connects current source I by described 2nd S2；Described input module adopts described voltage VIN and/or described current source I as input primary signal。
Preferably, described reference voltage includes the first reference voltage V R1, and described amplifier module includes amplifier Amplifier, and the positive input terminal of described amplifier Amplifier connects the first reference voltage V R1。
Preferably, described comparison module includes comparator Comparator, and the positive input terminal of described comparator Comparator connects the second reference voltage V R2。
Preferably, described supplementary module includes the 3rd switch S31,4th switch S32,5th switch S33,6th switch S3B1,7th switch S3B2 and integrating capacitor Cint, described 3rd switch S31 one end connects the first reference voltage V R1, the other end connects top crown and the 6th switch S3B1 of described integrating capacitor Cint, described 4th switch S32 one end connects the second reference voltage V R2, the other end connects bottom crown and the 7th switch S3B2 of described integrating capacitor Cint, and described 5th switch S33 is connected across described 6th switch S3B1 and the seven and switchs S3B2；Wherein, the negative input end of described amplifier Amplifier connects described 5th switch S33 and the six and switchs S3B1, and outfan connects the negative input end of described comparator Comparator, the 5th switch S33 and the seven switchs S3B2；
When reset RESET, described 3rd switch S31, the 4th switch S32 and the five switchs S33 Guan Bi, and described 6th switch S3B1 and the seven switchs S3B2 and disconnect, and described integrating capacitor Cint is charged by described first reference voltage V R1 and the second reference voltage V R2；
When reset RESET terminates, described 3rd switch S31, the 4th switch S32 and the five switchs S33 and disconnects, and described 6th switch S3B1 and the seven switchs S3B2 Guan Bi, and the electric charge of described integrating capacitor Cint is (VR2-VR1) * Cint。
Preferably, described supplementary module includes the 3rd switch S31,4th switch S32,5th switch S3B, integrating capacitor Cint, described 3rd switch S31 one end connects the second reference voltage V R2, and the other end connects the bottom crown of integrating capacitor Cint and described 5th switch S3B, described 4th switch S32 one end connects the top crown of described integrating capacitor Cint, and the other end connects described 5th switch S3B；Wherein, the negative input end of described amplifier Amplifier connects the top crown of described 4th switch S32 and integrating capacitor Cint, and outfan connects the negative input end of described comparator Comparator, the 4th switch S32 and the five switchs S3B；
When reset RESET, described 3rd switch S31 and the four switchs S32 Guan Bi, and described 5th switch S3B disconnects, and described integrating capacitor Cint is charged by described second reference voltage V R2 and amplifier Amplifier；
When reset RESET terminates, described 3rd switch S31 and the four switchs S32 and disconnects, and described 5th switch S3B Guan Bi, the electric charge of described integrating capacitor Cint is (VR2-(VR1-Vos2)) * Cint；Described Vos2 is the offset voltage of amplifier Amplifier。
Preferably, described supplementary module includes the 3rd switch S31,4th switch S3B and integrating capacitor Cint, the bottom crown of described integrating capacitor Cint connects the 4th switch S3B, top crown connects the negative input end of the 3rd switch S31 and amplifier Amplifier, and described 3rd switch S31 connects the 4th switch S3B；Described comparison module also includes the 5th switch S32, and one end of described 5th switch S32 connects the bottom crown of integrating capacitor Cint and the negative input end of described comparator Comparator, and the other end connects the outfan of described comparator Comparator；
When reset RESET, described 3rd switch S31 and the five switchs S32 Guan Bi, and described 4th switch S3B disconnects, and described integrating capacitor Cint is charged by described amplifier Amplifier and comparator Comparator；
When reset RESET terminates, described 3rd switch S31 and the five switchs S32 and disconnects, and described 4th switch S3B Guan Bi, the electric charge of described integrating capacitor Cint is ((VR2-Vos3)-(VR1-Vos2))；Described Vos2 is the offset voltage of amplifier Amplifier, and described Vos3 is the offset voltage of comparator Comparator。
The embodiment of the present invention additionally provides a kind of method of integration analog digital conversion, including:
Input primary signal；
Auxiliary signal is stored according to described reference voltage；
Adopt described auxiliary signal and primary signal to be integrated, generate integrated signal；
Described integrated signal is compared with the reference voltage preset, generates conversion signal。
Preferably, described primary signal adopts input module input, described auxiliary signal adopts supplementary module to store according to described reference voltage, described integrated signal adopts amplifier module to adopt described auxiliary signal and primary signal to be integrated generating, and described conversion signal adopts comparison module that described integrated signal and reference voltage are compared generation。
Preferably, described reference voltage includes the first reference voltage V R1 and the second reference voltage V R2；Described supplementary module includes integrating capacitor Cint, wherein,
When reset RESET, adopt described first reference voltage V R1 and the second reference voltage V R2 that described integrating capacitor Cint is charged；Then when reset RESET terminates, the electric charge of described integrating capacitor Cint is (VR2-VR1) * Cint；
Or,
When reset RESET, adopt described second reference voltage V R2 and amplifier Amplifier that described integrating capacitor Cint is charged；Then when reset RESET terminates, the electric charge of described integrating capacitor Cint is (VR2-(VR1-Vos2)) * Cint；Described Vos2 is the offset voltage of amplifier module；
Or,
When reset RESET, adopt described amplifier Amplifier and comparator Comparator that described integrating capacitor Cint is charged；Then when reset RESET terminates, the electric charge of described integrating capacitor Cint is ((VR2-Vos3)-(VR1-Vos2))；Described Vos2 is the offset voltage of amplifier module, and described Vos3 is the offset voltage of comparison module。
Compared with prior art, the embodiment of the present invention includes advantages below:
Integrating analog to digital converter in the embodiment of the present invention, including the input module for inputting primary signal, for storing the supplementary module of auxiliary signal according to described reference voltage, for jointly described auxiliary signal and primary signal being integrated with supplementary module, generate the amplifier module of integrated signal, and for described integrated signal and reference voltage are compared, generate the comparison module of marking signal, reference voltage is preserved, it is possible to the output area of amplifier module is increased by supplementary module。In addition, offset voltage is preserved by supplementary module, the offset voltage eliminating amplifier module on the output area basis of amplifier module can also increased, even it is possible not only to increase the output area of integration module and eliminate the offset voltage of integration amplifier, the offset voltage of comparison module can also be eliminated, improve the conversion accuracy of integration modulus device。
The agent structure of integrating analog to digital converter, from the structure of zero, is not had particular/special requirement, therefore suitable in various integrating analog to digital converter by the increase output area of the integrating analog to digital converter of the embodiment of the present invention and elimination。Meanwhile, this circuit structure is simple, it is only necessary to suitably increase several switch, required less costly。
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of a kind of digital to analog converter from zero-reset structure；
Fig. 2 is the electrical block diagram of a kind of fraction weighted-voltage D/A converter；
Fig. 3 is the structured flowchart of a kind of integrating analog to digital converter embodiment one of the present invention；
Fig. 4 is the structural representation of a kind of integrating analog to digital converter embodiment two of the present invention；
Fig. 5 is the structural representation of a kind of integrating analog to digital converter embodiment three of the present invention；
Fig. 6 is the structural representation of a kind of integrating analog to digital converter embodiment four of the present invention；
Fig. 7 is the flow chart of steps of the embodiment of the method for a kind of integration analog digital conversion of the present invention。
Detailed description of the invention
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation。
Electrical block diagram with reference to a kind of digital to analog converter from zero-reset structure shown in Fig. 1, whole main circuit will by buffer Buffer701, integrator Integrator702 and comparator Comparator703 composition, this structure utilizes and can eliminate buffer Buffer from zero electric capacity Cz and integrating capacitor Cint, the offset voltage of integrator Integrator and Comparator comparator, but this circuit has the disadvantage that, the starting voltage of integrator Integrator must from reference voltage VCOM, consider input voltage range, reference voltage VCOM generally can near the intermediate level of supply voltage, this reduces the output area of integrator Integrator, and then affect the precision of analog-digital converter。
Electrical block diagram with reference to a kind of fraction weighted-voltage D/A converter shown in Fig. 2, whole main circuit to be made up of integrator Integrator and comparator Comparator, this circuit equally exists integrator Integrator starting voltage must from the reference voltage VCOM problem started, therefore likewise result in the output area reducing integrator Integrator, and then affect the precision of analog-digital converter。
Therefore, for the problem solving precision of A/D converter, the embodiment of the present invention proposes a kind of fraction weighted-voltage D/A converter, effect of noise is reduced in order to eliminate offset voltage, or increase output area when noise can not reduce, to improve the precision of analog-digital converter, the circuit structure of this integration analog digital conversion is simple simultaneously, required less costly, and be easily achieved。
Embodiment one:
With reference to Fig. 3, it is shown that the structured flowchart of a kind of integrating analog to digital converter embodiment one of the present invention, specifically can including input module, amplifier module, comparison module and supplementary module, described amplifier module, comparison module and supplementary module connect reference voltage；Wherein,
Input module 101, is used for inputting primary signal；
Supplementary module 102, for storing auxiliary signal according to described reference voltage；
Amplifier module 103, for adopting described auxiliary signal and described primary signal to be integrated with described supplementary module 102, generates integrated signal；
Comparison module 104, for described integrated signal and reference voltage being compared, generates conversion signal。
In implementing, integrating analog to digital converter is by the analogue signal of real world, for instance temperature, pressure, sound or image etc., it is necessary to convert the digital form being easier to store, process and launch to。Analog-digital converter can realize this function, along with the development of electronic technology, can find its figure at present in various different products。
Integrating analog to digital converter in the embodiment of the present invention, including the input module for inputting primary signal, for storing the supplementary module of auxiliary signal according to described reference voltage, for described auxiliary signal and primary signal being integrated with supplementary module, generate the amplifier module of integrated signal, and for described integrated signal and reference voltage being compared, generate the comparison module of marking signal, reference voltage is preserved, it is possible to the output area of integration module is increased by supplementary module。In addition, offset voltage is preserved by supplementary module, the offset voltage eliminating amplifier module on the output area basis of integration module can also increased, even it is possible not only to increase the output area of amplifier module and eliminate the offset voltage of integration amplifier, the offset voltage of comparison module can also be eliminated, improve the conversion accuracy of integration modulus device。
Embodiment two:
With reference to Fig. 4, it is shown that a kind of integrating analog to digital converter embodiment two structured flowchart of the present invention, specifically can including input module, amplifier module, comparison module and supplementary module, described amplifier module, comparison module and supplementary module connect reference voltage；Wherein,
Input module 201 and 202, is used for inputting primary signal；
In one preferred embodiment of the invention, described input module 201 and 202 can include integrating resistor Rint, the first switch S1 and second switch S2, switchs S1 by described first and connects voltage VIN, connects current source I by described 2nd S2；Described input module adopts described voltage VIN and/or described current source I to generate primary signal。
Supplementary module 203, for storing auxiliary signal according to described reference voltage；
Amplifier module 204, for jointly described auxiliary signal and primary signal being integrated with supplementary module 203, generates integrated signal；
Described reference voltage can include the first reference voltage V R1, and it is a kind of differential amplifier that described amplifier module 204 can include amplifier Amplifier, described amplifier Amplifier, it is possible to act the effect amplifying signal。The positive input terminal of described amplifier Amplifier connects the first reference voltage V R1。
Described reference voltage can include the second reference voltage V R2, and described comparison module 205 can include comparator Comparator, and the positive input terminal of described comparator Comparator connects the second reference voltage V R2。
In one preferred embodiment of the invention, described supplementary module 203 includes the 3rd switch S31, 4th switch S32, 5th switch S33, 6th switch S3B1, 7th switch S3B2 and integrating capacitor Cint, described 3rd switch S31 one end connects the first reference voltage V R1, the other end connects top crown and the 6th switch S3B1 of described integrating capacitor Cint, described 4th switch S32 one end connects the second reference voltage V R2, the other end connects bottom crown and the 7th switch S3B2 of described integrating capacitor Cint, described 5th switch S33 is connected across described 6th switch S3B1 and the seven and switchs S3B2；Wherein, the negative input end of described amplifier Amplifier connects described 5th switch S33 and the six and switchs S3B1, and outfan connects the negative input end of described comparator Comparator, the 5th switch S33 and the seven switchs S3B2；
When reset RESET, described 3rd switch S31, the 4th switch S32 and the five switchs S33 Guan Bi, and described 6th switch S3B1 and the seven switchs S3B2 and disconnect, and described integrating capacitor Cint is charged by described first reference voltage V R1 and the second reference voltage V R2；
When reset RESET terminates, described 3rd switch S31, the 4th switch S32 and the five switchs S33 and disconnects, and described 6th switch S3B1 and the seven switchs S3B2 Guan Bi, and the electric charge of described integrating capacitor Cint is (VR2-VR1) * Cint。
In a kind of preferred exemplary that the present invention specifically applies, before integrating analog to digital converter integration, first circuit resets RESET, now switch S3 (i.e. the 3rd switch S31,4th switch S32 and the five switchs S33) all close, the disconnection that switch S3B (namely the 6th switch S3B1 and the seven switchs S3B2) is whole, amplifier Amplifier and switch S3 and switch S3B is connected into buffer Buffer structure, integrating capacitor Cint and amplifier Amplifier disconnects, and integrating capacitor Cint is charged by the first reference voltage V R1 and the second reference voltage V R2 simultaneously。When reset RESET terminates, S3 is all off for switch, switch S3B Guan Bi, now there is charge Q=(VR2-VR1) * Cint in integrating capacitor Cint, amplifier Amplifier output starts integration from the second reference voltage V R2, increase the excursion of amplifier Amplifier, improve the precision of analog-digital converter。
Comparison module 205, for described integrated signal and reference voltage being compared, generates conversion signal。
Embodiment three:
With reference to Fig. 5, it is shown that a kind of integrating analog to digital converter embodiment three structured flowchart of the present invention, specifically can including input module, amplifier module, comparison module and supplementary module, described amplifier module, comparison module and supplementary module connect reference voltage；Wherein,
Input module 301 and 302, is used for inputting primary signal；
Supplementary module 303, for storing auxiliary signal according to described reference voltage；
Amplifier module 304, for jointly described auxiliary signal and primary signal being integrated with supplementary module 303, generates integrated signal；In one preferred embodiment of the invention, described supplementary module 303 can include the 3rd switch S31,4th switch S32,5th switch S3B, integrating capacitor Cint, described 3rd switch S31 one end connects the second reference voltage V R2, and the other end connects the bottom crown of integrating capacitor Cint and described 5th switch S3B, described 4th switch S32 one end connects the top crown of described integrating capacitor Cint, and the other end connects described 5th switch S3B；Wherein, the negative input end of described amplifier Amplifier connects the top crown of described 4th switch S32 and integrating capacitor Cint, and outfan connects the negative input end of described comparator Comparator, the 4th switch S32 and the five switchs S3B；
When reset RESET, described 3rd switch S31 and the four switchs S32 Guan Bi, and described 5th switch S3B disconnects, and described integrating capacitor Cint is charged by described second reference voltage V R2 and amplifier Amplifier；
When reset RESET terminates, described 3rd switch S31 and the four switchs S32 and disconnects, and described 5th switch S3B Guan Bi, the electric charge of described integrating capacitor Cint is (VR2-(VR1-Vos2)) * Cint；Described Vos2 is the offset voltage of amplifier Amplifier。
Comparison module 305, for described integrated signal and reference voltage being compared, generates conversion signal。
In a kind of preferred exemplary that the present invention specifically applies, before integrating analog to digital converter integration, first circuit resets RESET, now switch S3 (namely the 3rd switch S31 and the four switchs S32) all to close, switch S3B (i.e. the 5th switch S3B) disconnects, amplifier Amplifier and switch S3 and switch S3B is connected into buffer Buffer structure, and integrating capacitor Cint is charged by the second reference power supply VR2。When reset RESET terminates, switch S3 disconnects, switch S3B Guan Bi, now there is charge Q=(VR2-(VR1-Vos2)) * Cint in integrating capacitor Cint, the offset voltage of amplifier Amplifier exists on integrating capacitor Cint, amplifier Amplifier output starts integration from the second reference voltage V R2, increases the excursion of amplifier Amplifier, improves the precision of analog-digital converter。
Embodiment four:
With reference to Fig. 6, it is shown that a kind of integrating analog to digital converter embodiment four structured flowchart of the present invention, specifically can include input module, amplifier module, comparison module and supplementary module, described comparison module and amplifier module and connect reference voltage；Wherein,
Output module 401 and 402, is used for exporting primary signal；
Supplementary module 403, for storing auxiliary signal according to described reference voltage；
Amplifier module 404, for jointly described auxiliary signal and primary signal being integrated with supplementary module 403, generates integrated signal；
Comparison module 405, for described integrated signal and reference voltage being compared, generates conversion signal。
In one preferred embodiment of the invention, described supplementary module 403 can include the 3rd switch S31,4th switch S3B and integrating capacitor Cint, described integrating capacitor Cint bottom crown connects the 4th switch S3B, top crown connects the negative input end of the 3rd switch S31 and amplifier Amplifier, and described 3rd switch S31 connects the 4th switch S3B；Described comparison module also includes the 5th switch S32, and one end of described 5th switch S32 connects the bottom crown of integrating capacitor Cint and the negative input end of described comparator Comparator, and the other end connects the outfan of described comparator Comparator；
When reset RESET, described 3rd switch S31 and the five switchs S32 Guan Bi, and described 4th switch S3B disconnects, and described integrating capacitor Cint is charged by described amplifier Amplifier and comparator Comparator；
When reset RESET terminates, described 3rd switch S31 and the five switchs S32 and disconnects, and described 4th switch S3B Guan Bi, the electric charge of described integrating capacitor Cint is ((VR2-Vos3)-(VR1-Vos2))；Described Vos2 is the offset voltage of amplifier Amplifier, and described Vos3 is the offset voltage of comparator Comparator。
In a kind of preferred exemplary that the present invention specifically applies, before integrating analog to digital converter integration, first circuit resets RESET, now switch S3 (namely the 3rd switch S31 and the five switchs S32) Guan Bi, switch S3B (the 4th switch S3B) namely disconnects, amplifier Amplifier and switch S3 and switch S3B is connected into buffer Buffer structure, it is connected into buffer Buffer structure with comparator Comparator integrating capacitor Cint is charged simultaneously, now integrating capacitor Cint top crown voltage is the VR1-Vos2 offset voltage Vos2 preserving amplifier Amplifier, integrating capacitor Cint bottom crown voltage is the VR2-Vos3 offset voltage Vos3 preserving comparator Comparator, electric charge on integrating capacitor Cint is Q=((VR2-Vos3)-(VR1-Vos2)), amplifier Amplifier output starts integration from VR2-Vos3, increase the excursion of amplifier Amplifier, improve the precision of analog-digital converter。
The agent structure of integrating analog to digital converter, from the structure of zero, is not had particular/special requirement, therefore suitable in various integrating analog to digital converter by the increase output area of the integrating analog to digital converter of the embodiment of the present invention and elimination。Meanwhile, this circuit structure is simple, it is only necessary to suitably increase several switch, required less costly。
It should be noted that, the structure of supplementary module is intended merely as example in embodiments of the present invention, in actual applications, those skilled in the art carry out respective change according to the actual requirements, such as integrating analog to digital converter increases new module, then can changing the structure of supplementary module according to this module, eliminate the offset voltage of this new module, this is not any limitation as by the embodiment of the present invention。
Embodiment five:
With reference to Fig. 7, it is shown that the flow chart of steps of the conversion method of a kind of integrating analog to digital converter of the present invention, specifically may include steps of:
Step 501, inputs primary signal；
Step 502, stores auxiliary signal according to described reference voltage；
Step 503, adopts described auxiliary signal and primary signal to be integrated, and generates integrated signal；
Step 504, compares described integrated signal with the reference voltage preset, generates conversion signal。
In one preferred embodiment of the invention, described primary signal adopts input module input, described auxiliary signal adopts supplementary module to store according to described reference voltage, described integrated signal adopts integration module to adopt described auxiliary signal and primary signal to be integrated generating, and described conversion signal adopts comparison module that described integrated signal and reference voltage are compared generation。
In one preferred embodiment of the invention, described reference voltage can include the first reference voltage V R1 and the second reference voltage V R2；Described supplementary module includes integrating capacitor Cint, wherein,
When reset RESET, adopt described first reference voltage V R1 and the second reference voltage V R2 that described integrating capacitor Cint is charged；Then when reset RESET terminates, the electric charge of described integrating capacitor Cint is (VR2-VR1) * Cint；
Or,
When reset RESET, adopt described second reference voltage V R2 amplifier Amplifier that described integrating capacitor Cint is charged；Then when reset RESET terminates, the electric charge of described integrating capacitor Cint is (VR2-(VR1-Vos2)) * Cint；Described Vos2 is the offset voltage of amplifier；
Or,
When reset RESET, adopt described amplifier Amplifier and comparator Comparator that described integrating capacitor Cint is charged；Then when reset RESET terminates, the electric charge of described integrating capacitor Cint is ((VR2-Vos3)-(VR1-Vos2))；Described Vos2 is the offset voltage of amplifier module, and described Vos3 is the offset voltage of comparison module。
For embodiment of the method, due to itself and each embodiment basic simlarity of aforementioned integral analog-digital converter, so what describe is fairly simple, relevant part illustrates referring to the part of the embodiment of integrating analog to digital converter。
Each embodiment in this specification all adopts the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually referring to。
Above to a kind of integrating analog to digital converter provided by the present invention, and the long-pending submodular conversion method of one, it is described in detail, principles of the invention and embodiment are set forth by specific case used herein, and the explanation of above example is only intended to help to understand method and the core concept thereof of the present invention；Simultaneously for one of ordinary skill in the art, according to the thought of the present invention, all will change in specific embodiments and applications, in sum, this specification content should not be construed as limitation of the present invention。
Claims (10)
1. an integrating analog to digital converter, it is characterised in that including input module, amplifier module, comparison module and supplementary module, described amplifier module, comparison module and supplementary module connect reference voltage；Wherein,
Input module, is used for inputting primary signal；
Supplementary module, for storing auxiliary signal according to described reference voltage；
Amplifier module, for jointly described auxiliary signal and described primary signal being integrated with described supplementary module, generates integrated signal；
Comparison module, for described integrated signal and reference voltage being compared, generates conversion signal。
2. integrating analog to digital converter according to claim 1, it is characterised in that described input module includes integrating resistor Rint, the first switch S1 and second switch S2, switchs S1 by described first and connects voltage VIN, connects current source I by described 2nd S2；Described input module adopts described voltage VIN and/or described current source I as input primary signal。
3. integrating analog to digital converter according to claim 1, it is characterized in that, described reference voltage includes the first reference voltage V R1, and described amplifier module includes amplifier Amplifier, and the positive input terminal of described amplifier Amplifier connects the first reference voltage V R1。
4. integrating analog to digital converter according to claim 1, it is characterised in that described comparison module includes comparator Comparator, and the positive input terminal of described comparator Comparator connects the second reference voltage V R2。
5. the integrating analog to digital converter according to claim 1 or 3 or 4, it is characterized in that, described supplementary module includes the 3rd switch S31, 4th switch S32, 5th switch S33, 6th switch S3B1, 7th switch S3B2 and integrating capacitor Cint, described 3rd switch S31 one end connects the first reference voltage V R1, the other end connects top crown and the 6th switch S3B1 of described integrating capacitor Cint, described 4th switch S32 one end connects the second reference voltage V R2, the other end connects bottom crown and the 7th switch S3B2 of described integrating capacitor Cint, described 5th switch S33 is connected across described 6th switch S3B1 and the seven and switchs S3B2；Wherein, the negative input end of described amplifier Amplifier connects described 5th switch S33 and the six and switchs S3B1, and outfan connects the negative input end of described comparator Comparator, the 5th switch S33 and the seven switchs S3B2；
When reset RESET, described 3rd switch S31, the 4th switch S32 and the five switchs S33 Guan Bi, and described 6th switch S3B1 and the seven switchs S3B2 and disconnect, and described integrating capacitor Cint is charged by described first reference voltage V R1 and the second reference voltage V R2；
When reset RESET terminates, described 3rd switch S31, the 4th switch S32 and the five switchs S33 and disconnects, and described 6th switch S3B1 and the seven switchs S3B2 Guan Bi, and the electric charge of described integrating capacitor Cint is (VR2-VR1) * Cint。
6. the integrating analog to digital converter according to claim 1 or 3 or 4, it is characterized in that, described supplementary module includes the 3rd switch S31,4th switch S32, the 5th switch S3B, integrating capacitor Cint, described 3rd switch S31 one end connects the second reference voltage V R2, the other end connects the bottom crown of integrating capacitor Cint and described 5th switch S3B, and described 4th switch S32 one end connects the top crown of described integrating capacitor Cint, and the other end connects described 5th switch S3B；Wherein, the negative input end of described amplifier Amplifier connects the top crown of described 4th switch S32 and integrating capacitor Cint, and outfan connects the negative input end of described comparator Comparator, the 4th switch S32 and the five switchs S3B；
When reset RESET, described 3rd switch S31 and the four switchs S32 Guan Bi, and described 5th switch S3B disconnects, and described integrating capacitor Cint is charged by described second reference voltage V R2 and amplifier Amplifier；
When reset RESET terminates, described 3rd switch S31 and the four switchs S32 and disconnects, and described 5th switch S3B Guan Bi, the electric charge of described integrating capacitor Cint is (VR2-(VR1-Vos2)) * Cint；Described Vos2 is the offset voltage of amplifier Amplifier。
7. the integrating analog to digital converter according to claim 1 or 3 or 4, it is characterized in that, described supplementary module includes the 3rd switch S31,4th switch S3B and integrating capacitor Cint, the bottom crown of described integrating capacitor Cint connects the 4th switch S3B, top crown connects the negative input end of the 3rd switch S31 and amplifier Amplifier, and described 3rd switch S31 connects the 4th switch S3B；Described comparison module also includes the 5th switch S32, and one end of described 5th switch S32 connects the bottom crown of integrating capacitor Cint and the negative input end of described comparator Comparator, and the other end connects the outfan of described comparator Comparator；
When reset RESET, described 3rd switch S31 and the five switchs S32 Guan Bi, and described 4th switch S3B disconnects, and described integrating capacitor Cint is charged by described amplifier Amplifier and comparator Comparator；
When reset RESET terminates, described 3rd switch S31 and the five switchs S32 and disconnects, and described 4th switch S3B Guan Bi, the electric charge of described integrating capacitor Cint is ((VR2-Vos3)-(VR1-Vos2))；Described Vos2 is the offset voltage of amplifier Amplifier, and described Vos3 is the offset voltage of comparator Comparator。
8. the method for an integration analog digital conversion, it is characterised in that including:
Input primary signal；
Auxiliary signal is stored according to described reference voltage；
Adopt described auxiliary signal and primary signal to be integrated, generate integrated signal；
Described integrated signal is compared with the reference voltage preset, generates conversion signal。
9. method according to claim 8, it is characterized in that, described primary signal adopts input module input, described auxiliary signal adopts supplementary module to store according to described reference voltage, described integrated signal adopts amplifier module to adopt described auxiliary signal and primary signal to be integrated generating, and described conversion signal adopts comparison module that described integrated signal and reference voltage are compared generation。
10. method according to claim 8 or claim 9, it is characterised in that described reference voltage includes the first reference voltage V R1 and the second reference voltage V R2；Described supplementary module includes integrating capacitor Cint, wherein,
When reset RESET, adopt described first reference voltage V R1 and the second reference voltage V R2 that described integrating capacitor Cint is charged；Then when reset RESET terminates, the electric charge of described integrating capacitor Cint is (VR2-VR1) * Cint；
Or,
When reset RESET, adopt described second reference voltage V R2 and amplifier Amplifier that described integrating capacitor Cint is charged；Then when reset RESET terminates, the electric charge of described integrating capacitor Cint is (VR2-(VR1-Vos2)) * Cint；Described Vos2 is the offset voltage of amplifier module；
Or,
When reset RESET, adopt described amplifier Amplifier and comparator Comparator that described integrating capacitor Cint is charged；Then when reset RESET terminates, the electric charge of described integrating capacitor Cint is ((VR2-Vos3)-(VR1-Vos2))；Described Vos2 is the offset voltage of amplifier module, and described Vos3 is the offset voltage of comparison module。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116683737A (en) * | 2023-08-04 | 2023-09-01 | 深圳市思远半导体有限公司 | Zero-crossing comparison circuit and switching power supply |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5415648A (en) * | 1977-06-17 | 1979-02-05 | Chino Works Ltd | Integral ad converter |
| CN102868408A (en) * | 2011-07-05 | 2013-01-09 | 北京立博信荣科技有限公司 | Integral analog-to-digital converter |
| CN103312334A (en) * | 2013-05-27 | 2013-09-18 | 四川和芯微电子股份有限公司 | Integrator circuit suitable for Sigma-Delta ADC (Analog To Digital Conversion) circuit |
| CN103491320A (en) * | 2013-09-05 | 2014-01-01 | 北京立博信荣科技有限公司 | Image sensing circuit and method |
-
2014
- 2014-11-24 CN CN201410685474.4A patent/CN105703775B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5415648A (en) * | 1977-06-17 | 1979-02-05 | Chino Works Ltd | Integral ad converter |
| CN102868408A (en) * | 2011-07-05 | 2013-01-09 | 北京立博信荣科技有限公司 | Integral analog-to-digital converter |
| CN103312334A (en) * | 2013-05-27 | 2013-09-18 | 四川和芯微电子股份有限公司 | Integrator circuit suitable for Sigma-Delta ADC (Analog To Digital Conversion) circuit |
| CN103491320A (en) * | 2013-09-05 | 2014-01-01 | 北京立博信荣科技有限公司 | Image sensing circuit and method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116683737A (en) * | 2023-08-04 | 2023-09-01 | 深圳市思远半导体有限公司 | Zero-crossing comparison circuit and switching power supply |
| CN116683737B (en) * | 2023-08-04 | 2024-02-20 | 深圳市思远半导体有限公司 | Zero-crossing comparison circuit and switching power supply |
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