CN110471484B - Voltage reference source circuit and application thereof in shunt type I/F conversion circuit - Google Patents
Voltage reference source circuit and application thereof in shunt type I/F conversion circuit Download PDFInfo
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- CN110471484B CN110471484B CN201910785441.XA CN201910785441A CN110471484B CN 110471484 B CN110471484 B CN 110471484B CN 201910785441 A CN201910785441 A CN 201910785441A CN 110471484 B CN110471484 B CN 110471484B
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Abstract
The invention discloses a voltage reference source circuit and application thereof in a shunt type I/F conversion circuit, which adopts a method of sharing a voltage reference and a sampling resistor, reduces the number and the types of positive and negative circuit components as much as possible and improves the symmetry. Meanwhile, the voltage references of the positive circuit and the negative circuit are added with the following circuits to ensure the stability of the references. In order to improve the symmetry index of the circuit, proportional resistors capable of finely adjusting positive and negative reference voltages, namely a first resistor and a second resistor, are designed, and the symmetry of the system is ensured by finely adjusting the reference voltages. In conclusion, the design method for improving the symmetry and stability of the shunt type I/F converter provided by the invention has the advantages of simple structure, convenience in use, capability of saving component cost, wide application in a high-precision I/F converter circuit system and very wide application prospect and market potential.
Description
Technical Field
The invention belongs to the technical field of semiconductor hybrid integrated circuit design, and particularly relates to a voltage reference source circuit and application thereof in a shunt type I/F conversion circuit.
Background
The current/frequency conversion (I/F) circuit is a conversion circuit for digitizing current signals, and is often used in a navigation control system to convert the output current of an accelerometer into pulse output or other situations requiring high-precision analog/digital conversion. Because the output of the accelerometer head is a current analog signal, the current analog signal must be converted into a digital signal through an I/F circuit so as to be processed by a computer in the inertial navigation system.
The traditional I/F conversion circuit adopts a constant current source for feedback, and the technical implementation mode has the following defects:
the constant current source structure is complicated, and positive and negative constant current source symmetry is relatively poor: in order to realize the output of the positive and negative constant current sources, the functions of positive and negative reference voltages must be realized by using independent positive and negative voltage references respectively or turning over after sharing a three-terminal voltage reference, so that the positive and negative constant current sources are poor in symmetry, a large number of components are used, and a high-precision sampling resistor is required, so that the circuit cost is high, and the reliability is relatively reduced.
The circuit power consumption is big, and service environment is restricted: the constant current source is adopted for feedback, and in order to increase the conversion range, the output current of the constant current source must be increased, so that the power consumption of the I/F conversion circuit is greatly increased, and the stability, reliability and application field of the I/F conversion circuit are further influenced.
In order to increase the range of the I/F conversion circuit and reduce the power consumption of the circuit, a constant voltage source can be adopted for feedback, namely, the shunt type I/F conversion circuit with the shunt structure is designed. However, the shunt type I/F conversion circuit generally has the problems of poor linearity, poor positive-negative path symmetry and poor stability, so that the wide application of the shunt type I/F conversion circuit is limited.
Disclosure of Invention
In order to solve the technical problems, the invention provides a voltage reference source circuit and application thereof in a shunt type I/F conversion circuit, and aims to provide a novel voltage reference source design method which is applied to the shunt type I/F conversion circuit to greatly improve the symmetry and stability of positive and negative path outputs of the shunt type I/F converter, so that the linearity of the shunt type I/F circuit and the precision of an inertial navigation system can be improved.
In order to solve the technical problems, the invention solves the problems by the following technical scheme:
a voltage reference source circuit comprises a voltage reference, a first operational amplifier, a second operational amplifier, an inverse proportion operational amplifier, a first resistor and a second resistor, wherein the input end of the voltage reference is connected with a power supply, the output end of the voltage reference is connected with the homodromous input end of the first operational amplifier, and the output end of the first operational amplifier is connected with the inverse input end of the first operational amplifier;
the output end of the voltage reference is connected with the reverse input end of the inverse proportion operational amplifier, the first resistor is connected between the output end of the voltage reference and the reverse input end of the inverse proportion operational amplifier, the homodromous input end of the inverse proportion operational amplifier is grounded, the output end of the inverse proportion operational amplifier is connected with the reverse input end of the inverse proportion operational amplifier, and the second resistor is connected between the output end of the inverse proportion operational amplifier and the reverse input end of the inverse proportion operational amplifier;
the output end of the inverse proportion operational amplifier is connected with the homodromous input end of the second operational amplifier, and the output end of the second operational amplifier is connected with the inverse input end of the second operational amplifier;
the output end of the first operational amplifier is a positive voltage reference end of the voltage reference source circuit, and the output end of the second operational amplifier is a negative voltage reference end of the voltage reference source circuit.
A shunting type I/F conversion circuit comprises an integrator, a logic control circuit and an analog electronic switch, wherein a voltage reference source circuit is applied, the input end of the integrator is connected with input current, and the output end of the integrator is connected with the logic control circuit; the control signal output end of the logic control circuit is connected with the analog electronic switch, and the logic control circuit is also provided with a digital output end for outputting digital pulse frequency and a clock input end for inputting an external clock; one end of the analog electronic switch is connected with the output end of the voltage reference source circuit, and the other end of the analog electronic switch is connected with the input end of the integrator;
the integrator is used for integrating the input current and outputting a voltage triangular wave to the logic control circuit;
the logic control circuit is used for comparing the voltage triangular wave output by the integrator with a preset fixed level, converting the voltage triangular wave into a digital logic level, and outputting a high-level control signal with a preset width to the analog electronic switch after the digital logic level reaches a logic high level of the logic control circuit;
the analog electronic switch is used for connecting the output end of the voltage reference source circuit with the polarity opposite to the input current of the integrator with the input end of the integrator after receiving a high-level control signal of the logic control circuit.
Further, the integrator comprises an operational amplifier, a capacitor, a third resistor and a fourth resistor;
the inverting input end of the operational amplifier is the input end of the integrator and is connected with the third resistor, and the third resistor is connected with the input current; the same-direction input end of the operational amplifier is grounded, the same-direction input end of the operational amplifier is connected with one end of the fourth resistor, and the other end of the fourth resistor is connected with input current; the output end of the operational amplifier is connected with the input end of the logic system; the output end and the inverting input end of the operational amplifier are connected through the capacitor.
Further, the resistance value of the third resistor is defined as R4, and the resistance value of the fourth resistor is defined as R5, then the shunt ratio of the third resistor to the fourth resistor is:
furthermore, two switch structures are arranged in the analog electronic switch; the first switch structure is connected with the positive voltage reference end, and the second switch structure is connected with the negative voltage reference end; each switch structure comprises two contacts; the first contacts of the first switch and the second switch are connected with the input end of the integrator through sampling resistors, the second contact of the first switch is connected with a positive voltage reference end, and the second contact of the second switch is connected with a negative voltage reference end.
Further, the first switch and the second switch are both single-pole single-throw switches.
Further, the logic control circuit comprises a comparator and a D flip-flop;
the input end of the comparator is connected with the output end of the integrator, and the output end of the comparator is connected with the input end of the D trigger; the D trigger is provided with a clock input end, and the clock input end is used for inputting an external clock; the D trigger is provided with a control signal input end, a digital output end and a control signal output end, the control signal output end is connected with the analog electronic switch, the digital output end is used for outputting digital pulse frequency, and the control signal output end is connected with the analog electronic switch.
Compared with the prior art, the invention has at least the following beneficial effects: in order to improve the symmetry of the positive and negative voltage references, the invention adopts a method of sharing one voltage reference and one sampling resistor, and reduces the number and the types of positive and negative circuit components as much as possible so as to improve the symmetry. Meanwhile, the voltage references of the positive circuit and the negative circuit are added with the following circuits to ensure the stability of the references.
Because the I/F conversion circuit has independent positive and negative channels in the logic control part, the analog switch and other parts when working, the symmetry of the positive and negative output channels is inevitably influenced, in order to improve the symmetry index of the circuit, proportional resistors capable of finely adjusting positive and negative reference voltages, namely a first resistor and a second resistor, are designed, and the symmetry of the system is ensured by finely adjusting the reference voltages.
In conclusion, the design method for improving the symmetry and stability of the shunt type I/F converter provided by the invention has the advantages of simple structure, convenience in use, capability of saving component cost, wide application in a high-precision I/F converter circuit system and very wide application prospect and market potential.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the positive and negative voltage reference sources of the present invention;
FIG. 2 is a schematic diagram of the overall structure of the shunting type I/F converting circuit of the present invention;
fig. 3 is a schematic block diagram of the shunt type I/F conversion circuit of the present invention.
In the figure: 1-voltage reference; 2-a first operational amplifier; 3-an inverse proportional operational amplifier; 4-a second operational amplifier; 5-a first resistance; 6-a second resistance; 7-an integrator; 8-a logic control circuit; 9-analog electronic switches; 10-sampling resistance; 11-a third resistance; 12-fourth resistance.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the voltage reference source circuit of the present invention includes a voltage reference 1, a first operational amplifier 2, a second operational amplifier 4, an inverse proportion operational amplifier 3, a first resistor 5 and a second resistor 6, wherein an input terminal of the voltage reference 1 is connected to a power supply, an output terminal of the voltage reference 1 is connected to a same-direction input terminal of the first operational amplifier 2, and an output terminal of the first operational amplifier 2 is connected to an inverse input terminal of the first operational amplifier 2;
the output end of the voltage reference 1 is connected with the reverse input end of the inverse proportion operational amplifier 3, a first resistor 5 is connected between the output end of the voltage reference 1 and the reverse input end of the inverse proportion operational amplifier 3, the homodromous input end of the inverse proportion operational amplifier 3 is grounded, the output end of the inverse proportion operational amplifier 3 is connected with the reverse input end of the inverse proportion operational amplifier 3, and a second resistor 6 is connected between the output end of the inverse proportion operational amplifier 3 and the reverse input end of the inverse proportion operational amplifier 3;
the output end of the inverse proportion operational amplifier 3 is connected with the homodromous input end of the second operational amplifier 4, the output end of the second operational amplifier 4 is connected with the inverse input end of the second operational amplifier 4, the output end of the first operational amplifier 2 is a positive voltage reference end of the voltage reference source circuit, and the output end of the second operational amplifier 4 is a negative voltage reference end of the voltage reference source circuit.
Defining the resistance value of the first resistor 5 as R1 and the resistance value of the second resistor 6 as R2, the reference voltage source is one of the key components of the I/F converter, and its accuracy and stability directly affect the accuracy and stability of the whole converter. The positive voltage reference source of the invention adopts a three-terminal reference, and the positive voltage reference is reversely used as a negative voltage reference through the proportional amplifying circuit, thereby realizing that the positive and negative voltage reference sources share one three-terminal reference, and greatly improving the reference symmetry, the schematic diagram is shown in figure 1, wherein the relation of the positive and negative voltage references is as follows:
when the circuit is used, the resistors R1 and R2 both adopt precision resistors with small temperature coefficients, and the symmetry of the output can be finely adjusted by adjusting the proportional resistor of the inverse proportional amplifying circuit, so that the symmetry index of the circuit is improved.
The positive and negative voltage references are isolated by adopting a following circuit, and the following circuit adopts a depth negative feedback structure formed by operational amplifiers, so that the stability and the anti-interference capability of reference output can be improved.
Referring to fig. 2 and fig. 3, the shunting type I/F converting circuit of the present invention includes an integrator 7, a logic control circuit 8, and an analog electronic switch 9, wherein the voltage reference source circuit is applied, an input end of the integrator 7 is connected to an input current, and an output end of the integrator 7 is connected to the logic control circuit 8; the control signal output end of the logic control circuit 8 is connected with the analog electronic switch 9, and the logic control circuit 8 is also provided with a digital output end for outputting digital pulse frequency and a clock input end for inputting an external clock; one end of the analog electronic switch 9 is connected with the output end of the voltage reference source circuit, and the other end is connected with the input end of the integrator 7;
the integrator 7 is used for integrating the input current and outputting a voltage triangular wave to the logic control circuit 8;
the logic control circuit 8 is used for comparing the voltage triangular wave output by the integrator 7 with a preset fixed level, converting the voltage triangular wave into a digital logic level, and outputting a high-level control signal with a preset width to the analog electronic switch 9 when the digital logic level reaches a logic high level of the logic control circuit 8;
the analog electronic switch 9 is used for connecting the output end of the voltage reference source circuit with the opposite polarity of the input current of the integrator 7 with the input end of the integrator 7 after receiving a high-level control signal of the logic control circuit 8.
As a certain preferred embodiment of the present invention,the integrator 7 comprises an operational amplifier, a capacitor, a third resistor 11 and a fourth resistor 12; the inverting input end of the operational amplifier is the input end of the integrator 7 and is connected with a third resistor 11, and the third resistor 11 is connected with the input current; the equidirectional input end of the operational amplifier is grounded, the equidirectional input end of the operational amplifier is connected with one end of a fourth resistor 12, and the other end of the fourth resistor 12 is connected with input current; the output end of the operational amplifier is connected with the input end of the logic system; the output end and the inverting input end of the operational amplifier are connected through a capacitor. Specifically, the resistance of the third resistor 11 is defined as R4, and the resistance of the fourth resistor 12 is defined as R5, then the shunt ratio between the third resistor 11 and the fourth resistor 12 is:
in order to improve the symmetry of the positive and negative channel outputs, the analog electronic switch 9 of the present invention selects two single-pole single-throw switches, and the common sampling resistor 10 is connected in series between the output of the analog electronic switch 9 and the SIGMA point, and the resistance of the sampling resistor 10 is defined as R3, which is specifically connected as shown in fig. 2. The feedback current value of the positive channel is VREF-/R3, and the feedback current value of the negative channel is VREF +/R3. The design of the invention can not only improve the symmetry of the circuit, but also save the circuit cost and use one less precision resistor.
The concrete connection mode is as follows: the first switch structure is connected with the positive voltage reference end, and the second switch structure is connected with the negative voltage reference end; each switch structure comprises two contacts; the first contacts of the first switch and the second switch are connected with the input end of the integrator 7 through the sampling resistor 10, the second contact of the first switch is connected with the positive voltage reference end, and the second contact of the second switch is connected with the negative voltage reference end. Preferably, the first switch and the second switch are both single pole single throw switches.
As a certain preferred embodiment of the present invention, the logic control circuit 8 includes a comparator and a D flip-flop;
the input end of the comparator is connected with the output end of the integrator 7, and the output end of the comparator is connected with the input end of the D trigger; a clock input end is arranged on the D trigger and used for inputting an external clock; the D trigger is provided with a control signal input end, a digital output end and a control signal output end, the control signal output end is connected with the analog electronic switch 9, the digital output end is used for outputting digital pulse frequency, and the control signal output end is connected with the analog electronic switch 9.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A shunting type I/F conversion circuit, comprising: the voltage reference source circuit comprises a voltage reference (1), a first operational amplifier (2), a second operational amplifier (4), an inverse proportion operational amplifier (3), a first resistor (5) and a second resistor (6), wherein the input end of the voltage reference (1) is connected with a power supply, the output end of the voltage reference (1) is connected with the homodromous input end of the first operational amplifier (2), and the output end of the first operational amplifier (2) is connected with the inverse input end of the first operational amplifier (2);
the output end of the voltage reference (1) is also connected with the reverse input end of the inverse proportional operational amplifier (3), the first resistor (5) is connected between the output end of the voltage reference (1) and the reverse input end of the inverse proportional operational amplifier (3), the homodromous input end of the inverse proportional operational amplifier (3) is grounded, the output end of the inverse proportional operational amplifier (3) is connected with the reverse input end of the inverse proportional operational amplifier (3), and the second resistor (6) is connected between the output end of the inverse proportional operational amplifier (3) and the reverse input end of the inverse proportional operational amplifier (3);
the output end of the inverse proportion operational amplifier (3) is also connected with the homodromous input end of the second operational amplifier (4), and the output end of the second operational amplifier (4) is connected with the inverse input end of the second operational amplifier (4);
the output end of the first operational amplifier (2) is a positive voltage reference end of a voltage reference source circuit, and the output end of the second operational amplifier (4) is a negative voltage reference end of the voltage reference source circuit;
the integrator (7) comprises an operational amplifier, a capacitor, a third resistor (11) and a fourth resistor (12);
the inverting input end of the operational amplifier is the input end of the integrator (7) and is connected with the third resistor (11), and the third resistor (11) is connected with the input current; the same-direction input end of the operational amplifier is grounded, the same-direction input end of the operational amplifier is connected with one end of the fourth resistor (12), and the other end of the fourth resistor (12) is connected with input current; the output end of the operational amplifier is connected with the input end of the logic control circuit (8); the output end and the reverse input end of the operational amplifier are connected through the capacitor;
the control signal output end of the logic control circuit (8) is connected with the analog electronic switch (9), and the logic control circuit (8) is also provided with a digital output end for outputting digital pulse frequency and a clock input end for inputting an external clock; one end of the analog electronic switch (9) is connected with the output end of the voltage reference source circuit, and the other end of the analog electronic switch is connected with the input end of the integrator (7);
defining the resistance value of the third resistor (11) to be R4 and the resistance value of the fourth resistor (12) to be R5, the shunt ratio of the third resistor (11) to the fourth resistor (12) is:
the integrator (7) is used for integrating the input current and outputting a voltage triangular wave to the logic control circuit (8);
the logic control circuit (8) is used for comparing the voltage triangular wave output by the integrator (7) with a preset fixed level, converting the voltage triangular wave into a digital logic level, and outputting a high-level control signal with a preset width to the analog electronic switch (9) when the digital logic level reaches a logic high level of the logic control circuit (8);
and the analog electronic switch (9) is used for connecting the output end of the voltage reference source circuit with the opposite polarity of the input current of the integrator (7) with the input end of the integrator (7) after receiving a high-level control signal of the logic control circuit (8).
2. The shunting type I/F conversion circuit as claimed in claim 1, wherein: two switch structures are arranged in the analog electronic switch (9); the first switch structure is connected with the positive voltage reference end, and the second switch structure is connected with the negative voltage reference end; each switch structure comprises two contacts; the first contacts of the first switch and the second switch are connected with the input end of the integrator (7) through a sampling resistor (10), the second contact of the first switch is connected with a positive voltage reference end, and the second contact of the second switch is connected with a negative voltage reference end.
3. The shunting type I/F conversion circuit as claimed in claim 2, wherein: the first switch and the second switch are both single-pole single-throw switches.
4. The shunting type I/F conversion circuit as claimed in claim 1, wherein: the logic control circuit (8) comprises a comparator and a D trigger;
the input end of the comparator is connected with the output end of the integrator (7), and the output end of the comparator is connected with the input end of the D trigger; the D trigger is provided with a clock input end, and the clock input end is used for inputting an external clock; the D trigger is provided with a control signal input end, a digital output end and a control signal output end, the control signal output end is connected with the analog electronic switch (9), the digital output end is used for outputting digital pulse frequency, and the control signal output end is connected with the analog electronic switch (9).
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| CN111638744B (en) * | 2020-04-30 | 2022-05-24 | 北京航天时代光电科技有限公司 | Current frequency conversion circuit |
| CN112152605B (en) * | 2020-09-27 | 2023-07-04 | 西安微电子技术研究所 | Three-way current frequency conversion circuit without comparator |
| CN112817361A (en) * | 2021-02-15 | 2021-05-18 | 北京瑞尔天天科技有限公司 | High-precision high-stability constant current source circuit |
| CN113984047B (en) * | 2021-10-29 | 2023-05-30 | 西安微电子技术研究所 | Method for adjusting positive and negative symmetry of scale factors of I/F conversion circuit |
| CN115133934A (en) * | 2022-06-14 | 2022-09-30 | 中船航海科技有限责任公司 | High-precision low-power current frequency conversion circuit and conversion method |
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