CN111551777A - Double-path pulse signal comparison detection circuit - Google Patents
Double-path pulse signal comparison detection circuit Download PDFInfo
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- CN111551777A CN111551777A CN202010412634.3A CN202010412634A CN111551777A CN 111551777 A CN111551777 A CN 111551777A CN 202010412634 A CN202010412634 A CN 202010412634A CN 111551777 A CN111551777 A CN 111551777A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/10—Measuring sum, difference or ratio
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0046—Arrangements for measuring currents or voltages or for indicating presence or sign thereof characterised by a specific application or detail not covered by any other subgroup of G01R19/00
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
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Abstract
The invention discloses a double-path pulse signal comparison and detection circuit which comprises a pulse acquisition circuit, a pulse comparison circuit and an energy operation circuit. The pulse acquisition circuit respectively acquires pulse signals on the two signal lines to obtain a first pulse signal and a second pulse signal; the pulse comparison circuit compares the first pulse signal with the second pulse signal to obtain an absolute value of a voltage difference value of the first pulse signal and the second pulse signal; the energy operation circuit obtains pulse difference energy according to the absolute value operation of the voltage difference, and the actual cancellation condition of the two pulse signals is determined based on the pulse difference energy. Therefore, the pulse difference energy on the two signal lines can be obtained, and the actual cancellation condition of the pulse signals on the two signal lines can be determined according to the pulse difference energy, so that a reference basis is provided for later circuit design improvement.
Description
Technical Field
The invention relates to the field of signal comparison and detection, in particular to a double-path pulse signal comparison and detection circuit.
Background
At present, in a circuit including a plurality of signal lines, each signal line generates a random pulse signal due to various noises or external environments, and the signal detection and determination of a subsequent element are directly affected. However, the problem of pulse signals is easily ignored, especially for pulse signals on differential signal lines, because the difference between signals on two signal lines of the differential signal line is used as a detection signal of a subsequent element, it is generally considered that the pulse signals on the two signal lines can be roughly cancelled out by subtracting the signals on the two signal lines, but the pulse signals on different signal lines are various, not only the signal size is not fixed, but also the signals are positive or negative, and the situation of cancellation of the pulse signals on the two signal lines cannot be directly determined, so that a reference basis cannot be provided for later circuit design improvement.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a two-way pulse signal comparison and detection circuit which can obtain the pulse difference energy on two signal lines and determine the actual cancellation condition of pulse signals on the two signal lines according to the pulse difference energy so as to provide a reference basis for later circuit design improvement.
In order to solve the above technical problem, the present invention provides a two-way pulse signal comparison and detection circuit, including:
the pulse acquisition circuit is used for respectively acquiring pulse signals on the two signal lines to obtain a first pulse signal and a second pulse signal;
the pulse comparison circuit is used for comparing the first pulse signal with the second pulse signal to obtain the absolute value of the voltage difference value of the first pulse signal and the second pulse signal;
and the energy operation circuit is used for obtaining pulse difference energy according to the absolute value operation of the voltage difference so as to determine the actual cancellation condition of the two pulse signals based on the pulse difference energy.
Preferably, the pulse acquisition circuit comprises a first capacitor, a second capacitor, a first resistor and a second resistor; wherein:
the first end of the first capacitor is connected with a pulse signal detection point of one signal line, the second end of the first capacitor is connected with the first end of the first resistor, the second end of the first resistor is connected with the pulse comparison circuit, the first end of the second capacitor is connected with a pulse signal detection point of the other signal line, the second end of the second capacitor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the pulse comparison circuit.
Preferably, the pulse comparison circuit includes:
a difference value calculating circuit respectively connected to the second end of the first resistor and the second end of the second resistor, for subtracting the second pulse signal from the first pulse signal to obtain a voltage difference value between the first pulse signal and the second pulse signal;
and the absolute value solving circuit is connected with the output end of the difference solving circuit and is used for carrying out absolute value processing on the voltage difference to obtain the absolute value of the voltage difference.
Preferably, the difference calculating circuit includes a third resistor, a fourth resistor, a third capacitor, and a first operational amplifier; wherein:
a first end of the third resistor is connected with a second end of the first resistor and a positive input end of the first operational amplifier respectively, a second end of the third resistor is connected with a first end of the third capacitor, a second end of the third capacitor is grounded, a negative input end of the first operational amplifier is connected with a second end of the second resistor and a first end of the fourth resistor respectively, a second end of the fourth resistor is connected with an output end of the first operational amplifier, and a common end of the fourth resistor is used as an output end of the difference value calculating circuit; the first resistor, the second resistor, the third resistor and the fourth resistor have the same resistance value.
Preferably, the difference value calculating circuit further includes a fifth resistor, a sixth resistor, a seventh resistor, and a fourth capacitor; wherein:
a first end of the fifth resistor is connected to a direct-current power supply, a second end of the fifth resistor is respectively connected with a first end of the sixth resistor, a first end of a third capacitor and a second end of the third resistor, a second end of the sixth resistor is grounded, a first end of the seventh resistor is respectively connected with an output end of the first operational amplifier and a second end of the fourth resistor, a second end of the seventh resistor is connected with a first end of the fourth capacitor, and a second end of the fourth capacitor is used as an output end of the difference value calculating circuit; wherein the resistance value of the third resistor is larger than the resistance value of the sixth resistor.
Preferably, the absolute value calculation circuit includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second operational amplifier, a third operational amplifier, a first switch, and a second switch; wherein:
a first end of the eighth resistor is connected to an output end of the difference value calculating circuit and a first end of the tenth resistor, a second end of the eighth resistor is connected to a first end of the ninth resistor, a first end of the second switch, and a reverse input end of the second operational amplifier, a forward input end of the second operational amplifier is grounded, an output end of the second operational amplifier is connected to a second end of the second switch and a first end of the first switch, a second end of the first switch is connected to a second end of the ninth resistor and a first end of the eleventh resistor, a second end of the eleventh resistor is connected to a second end of the tenth resistor, a first end of the twelfth resistor, and a reverse input end of the third operational amplifier, and a forward input end of the third operational amplifier is grounded, the output end of the third operational amplifier is respectively connected with the second end of the twelfth resistor and the input end of the energy operational circuit;
the resistance values of the eighth resistor, the ninth resistor and the eleventh resistor are equal, and the resistance values of the tenth resistor and the twelfth resistor are equal to 2 times of the resistance value of the eighth resistor; when the voltage difference value is a positive value, the first switch is turned on, and the second switch is turned off; when the voltage difference value is a negative value, the first switch is turned off, and the second switch is turned on.
Preferably, the absolute value calculation circuit further includes a fifth capacitor; wherein:
a first end of the fifth capacitor is connected to the second end of the eleventh resistor, the second end of the tenth resistor, the first end of the twelfth resistor, and the inverting input terminal of the third operational amplifier, respectively, and a second end of the fifth capacitor is connected to the output end of the third operational amplifier, the second end of the twelfth resistor, and the input terminal of the energy operational circuit, respectively.
Preferably, the first switch is specifically:
a first diode having a cathode as a first terminal of the first switch and an anode as a second terminal of the first switch;
the second switch specifically is:
and the cathode is used as a first end of the second switch, and the anode is used as a second diode of a second end of the second switch.
Preferably, the second operational amplifier is a high-voltage slew rate operational amplifier.
The invention provides a double-path pulse signal comparison and detection circuit which comprises a pulse acquisition circuit, a pulse comparison circuit and an energy operation circuit. The pulse acquisition circuit respectively acquires pulse signals on the two signal lines to obtain a first pulse signal and a second pulse signal; the pulse comparison circuit compares the first pulse signal with the second pulse signal to obtain an absolute value of a voltage difference value of the first pulse signal and the second pulse signal; the energy operation circuit obtains pulse difference energy according to the absolute value operation of the voltage difference, and the actual cancellation condition of the two pulse signals is determined based on the pulse difference energy. Therefore, the pulse difference energy on the two signal lines can be obtained, and the actual cancellation condition of the pulse signals on the two signal lines can be determined according to the pulse difference energy, so that a reference basis is provided for later circuit design improvement.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a two-way pulse signal comparison detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a two-way pulse signal comparison detection circuit according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a double-path pulse signal comparison and detection circuit, which can obtain the pulse difference energy on two signal lines and determine the actual cancellation condition of the pulse signals on the two signal lines according to the pulse difference energy so as to provide a reference basis for the later circuit design improvement.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a two-way pulse signal comparison and detection circuit according to an embodiment of the present invention.
This double-circuit pulse signal compares detection circuitry includes:
the pulse acquisition circuit 1 is used for respectively acquiring pulse signals on two signal lines to obtain a first pulse signal and a second pulse signal;
the pulse comparison circuit 2 is used for comparing the first pulse signal with the second pulse signal to obtain an absolute value of a voltage difference value between the first pulse signal and the second pulse signal;
and the energy operation circuit 3 is used for obtaining pulse difference energy according to the absolute value operation of the voltage difference so as to determine the actual cancellation condition of the two pulse signals based on the pulse difference energy.
Specifically, the double-circuit pulse signal comparison detection circuit of this application includes pulse acquisition circuit 1, pulse comparison circuit 2 and energy arithmetic circuit 3, and its theory of operation is:
the pulse acquisition circuit 1 acquires pulse signals on two signal lines respectively to obtain a first pulse signal and a second pulse signal, and outputs the first pulse signal and the second pulse signal to the pulse comparison circuit 2. The pulse comparison circuit 2 compares the first pulse signal with the second pulse signal, specifically, performs a difference between the first pulse signal and the second pulse signal to obtain a voltage difference between the first pulse signal and the second pulse signal.
Meanwhile, considering that the voltage values of the first pulse signal and the second pulse signal are positive or negative, the energy containing a positive value part and the energy containing a negative value part can appear after the comparison between the first pulse signal and the second pulse signal, the magnitude of the energy can reflect the actual cancellation condition of the first pulse signal and the second pulse signal, and the magnitude of the energy has a certain corresponding relation with the magnitude of the voltage absolute value, so that in order to subsequently obtain the energy reflecting the actual cancellation condition of the two pulse signals, the pulse comparison circuit 2 also obtains the absolute value of the voltage difference value between the first pulse signal and the second pulse signal, and outputs the absolute value of the voltage difference value between the first pulse signal and the second pulse signal to the energy operation circuit 3, so that the energy operation circuit 3 substitutes the absolute value of the voltage difference value between the two pulse signals into the preset voltage energy corresponding relation, and the pulse difference energy is obtained through operation.
The invention provides a double-path pulse signal comparison and detection circuit which comprises a pulse acquisition circuit, a pulse comparison circuit and an energy operation circuit. The pulse acquisition circuit respectively acquires pulse signals on the two signal lines to obtain a first pulse signal and a second pulse signal; the pulse comparison circuit compares the first pulse signal with the second pulse signal to obtain an absolute value of a voltage difference value of the first pulse signal and the second pulse signal; the energy operation circuit obtains pulse difference energy according to the absolute value operation of the voltage difference, and the actual cancellation condition of the two pulse signals is determined based on the pulse difference energy. Therefore, the pulse difference energy on the two signal lines can be obtained, and the actual cancellation condition of the pulse signals on the two signal lines can be determined according to the pulse difference energy, so that a reference basis is provided for later circuit design improvement.
On the basis of the above-described embodiment:
referring to fig. 2, fig. 2 is a schematic structural diagram of a two-way pulse signal comparison and detection circuit according to an embodiment of the present invention.
As an alternative embodiment, the pulse acquisition circuit 1 includes a first capacitor C1, a second capacitor C2, a first resistor R1, and a second resistor R2; wherein:
the first end of the first capacitor C1 is connected with the pulse signal detection point of one signal line, the second end of the first capacitor C1 is connected with the first end of the first resistor R1, the second end of the first resistor R1 is connected with the pulse comparison circuit 2, the first end of the second capacitor C2 is connected with the pulse signal detection point of the other signal line, the second end of the second capacitor C2 is connected with the first end of the second resistor R2, and the second end of the second resistor R2 is connected with the pulse comparison circuit 2.
Specifically, the pulse acquisition circuit 1 of the present application includes a first capacitor C1, a second capacitor C2, a first resistor R1, and a second resistor R2, and its operating principle is:
as shown in fig. 2, u1 and u2 are random pulse signals on two signal lines in the circuit, respectively. Considering that random pulse signals on two signal lines belong to alternating current signals, and the capacitor has the effect of isolating direct current from direct current, the application utilizes the first capacitor C1 to output a first pulse signal u1 to a subsequent circuit; similarly, the second capacitor C2 is used to output the second pulse signal u2 to the subsequent circuit.
In addition, in order to protect subsequent circuits, a first resistor R1 for limiting current is arranged at the rear side of the first capacitor C1, and a second resistor R2 for limiting current is arranged at the rear side of the second capacitor C2 in the same way.
As an alternative embodiment, the pulse comparison circuit 2 includes:
the difference value solving circuit is respectively connected with the second end of the first resistor R1 and the second end of the second resistor R2 and is used for subtracting the second pulse signal from the first pulse signal to obtain a voltage difference value of the first pulse signal and the second pulse signal;
and the absolute value solving circuit is connected with the output end of the difference solving circuit and is used for carrying out absolute value processing on the voltage difference to obtain the absolute value of the voltage difference.
Specifically, the pulse comparison circuit 2 of the present application includes a difference value calculation circuit and an absolute value calculation circuit, and its operating principle is:
when the absolute value of the voltage difference value of the two pulse signals is obtained, firstly, the difference value obtaining circuit subtracts the second pulse signal from the first pulse signal to obtain the voltage difference value of the two pulse signals, and the voltage difference value of the two pulse signals is output to the absolute value obtaining circuit; and then, an absolute value solving circuit carries out absolute value processing on the voltage difference value of the two pulse signals to obtain the absolute value of the voltage difference value of the two pulse signals.
As an alternative embodiment, the difference calculating circuit includes a third resistor R3, a fourth resistor R4, a third capacitor C3 and a first operational amplifier U1; wherein:
a first end of a third resistor R3 is respectively connected with a second end of the first resistor R1 and a positive input end of a first operational amplifier U1, a second end of the third resistor R3 is connected with a first end of a third capacitor C3, a second end of the third capacitor C3 is grounded, a reverse input end of the first operational amplifier U1 is respectively connected with a second end of the second resistor R2 and a first end of a fourth resistor R4, a second end of the fourth resistor R4 is connected with an output end of the first operational amplifier U1, and a common end serves as an output end of the difference calculating circuit; the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 have the same resistance.
Specifically, the difference calculating circuit of the present application includes a third resistor R3, a fourth resistor R4, a third capacitor C3, and a first operational amplifier U1, and the operating principle thereof is as follows:
the first operational amplifier U1 is a negative feedback circuit and has the characteristics of a virtual short, i.e., the voltages at the positive input terminal and the negative input terminal of the first operational amplifier U1 are equal, and a virtual break, i.e., the currents at the positive input terminal and the negative input terminal of the first operational amplifier U1 are 0. Based on R1 ═ R2 ═ R3 ═ R4, the output of the first operational amplifier U1 is negatively fed back through the operational amplifier to obtain the first pulse signal U1 — the second pulse signal U2.
As an alternative embodiment, the difference calculating circuit further includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a fourth capacitor C4; wherein:
a first end of a fifth resistor R5 is connected to a direct-current power supply, a second end of a fifth resistor R5 is respectively connected with a first end of a sixth resistor R6, a first end of a third capacitor C3 and a second end of the third resistor R3, a second end of a sixth resistor R6 is grounded, a first end of a seventh resistor R7 is respectively connected with an output end of a first operational amplifier U1 and a second end of a fourth resistor R4, a second end of a seventh resistor R7 is connected with a first end of a fourth capacitor C4, and a second end of a fourth capacitor C4 is used as an output end of a difference value calculating circuit; wherein, the resistance of the third resistor R3 is larger than the resistance of the sixth resistor R6.
Further, the difference value calculating circuit of the present application further includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a fourth capacitor C4, and the operating principle thereof is as follows:
considering that the input voltage of the first operational amplifier U1 has a certain safety range (positive value), if the input voltage of the first operational amplifier U1 is not within the corresponding safety range, the safety of the first operational amplifier U1 is affected, and the service life of the first operational amplifier U3526 is shortened; meanwhile, the voltage value of the random pulse signal on the signal line is considered to have a negative value and does not meet the input voltage safety range of the first operational amplifier U1, so that a voltage division circuit consisting of a fifth resistor R5 and a sixth resistor R6 is additionally arranged on the positive input end side of the first operational amplifier U1 to provide positive bias reference voltage for the positive input end of the first operational amplifier U1, and the positive bias reference voltage is accumulated with the first pulse signal U1, so that the input end of the first operational amplifier U1 is ensured to be a positive value.
As shown in fig. 2, based on the characteristics of the first operational amplifier U1, i.e., the virtual short and the virtual break, U3 is U4,
based on R1 ═ R2 ═ R3 ═ R4, and R5 ═ R6, u5 ═ u1-u2+ VCC.
Correspondingly, a seventh resistor R7 and a fourth capacitor C4 are additionally arranged at the output end of the first operational amplifier U1, wherein the seventh resistor R7 plays a role in limiting current; the fourth capacitor C4 functions as a dc blocking capacitor to remove the bias reference voltage output by the first operational amplifier U1 so that V1 is equal to U1-U2.
As an alternative embodiment, the absolute value calculation circuit includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a second operational amplifier U2, a third operational amplifier U3, a first switch D1, and a second switch D2; wherein:
a first end of an eighth resistor R8 is connected to an output end of the difference value calculating circuit and a first end of a tenth resistor R10, a second end of an eighth resistor R8 is connected to a first end of a ninth resistor R9, a first end of a second switch D2 and an inverting input end of a second operational amplifier U2, a forward input end of the second operational amplifier U2 is grounded, an output end of the second operational amplifier U2 is connected to a second end of the second switch D2 and a first end of a first switch D1, a second end of the first switch D1 is connected to a second end of the ninth resistor R9 and a first end of the eleventh resistor R11, a second end of the eleventh resistor R11 is connected to a second end of the tenth resistor R10, a first end of the twelfth resistor R12 is connected to an inverting input end of the third operational amplifier U3, a forward input end of the third operational amplifier U3 is grounded, and an output end of the third operational amplifier U3 is connected to a second end of the twelfth resistor R12 and an input end of the energy operation circuit 3, respectively;
the resistances of the eighth resistor R8, the ninth resistor R9 and the eleventh resistor R11 are equal, and the resistances of the tenth resistor R10 and the twelfth resistor R12 are equal to 2 times of the resistance of the eighth resistor R8; when the voltage difference is positive, the first switch D1 is turned on, and the second switch D2 is turned off; when the voltage difference is negative, the first switch D1 is turned off and the second switch D2 is turned on.
Specifically, the absolute value calculation circuit of the present application includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a second operational amplifier U2, a third operational amplifier U3, a first switch D1, and a second switch D2, and its operating principle is:
when the voltage difference V1 between U1 and U2 is a positive value, the first switch D1 is turned on, the second switch D2 is turned off, and the second operational amplifier U2 is in a reverse gain state, so that the virtual short characteristics of the second operational amplifier U2 are shown as follows: the voltage value at the inverting input of the second operational amplifier U2 is equal to 0V; based on the virtual break characteristic of the second operational amplifier U2, it is known that:
based on a third operationThe imaginary short characteristics of amplifier U3 are known: the voltage value at the inverting input of the third operational amplifier U3 is equal to 0V; based on the virtual break characteristic of the third operational amplifier U3, it is known that:
then
Based on R10 ═ R12 ═ 2 ═ R8 ═ 2 ═ R9 ═ 2 ═ R11, then Vout ═ V1 ═ u1-u 2.
When the voltage difference V1 between u1 and u2 is a negative value, the first switch D1 is turned off, and the second switch D2 is turned on, at which time V2 is 0V; based on the pseudo-short characteristics of the third operational amplifier U3: the voltage value at the inverting input of the third operational amplifier U3 is equal to 0V; based on the virtual break characteristic of the third operational amplifier U3, it is known that:
based on R10 ═ R12, Vout ═ -V1 ═ - (u1-u 2).
It can be seen that the output Vout of the third operational amplifier U3 takes the absolute value of V1, that is, the absolute value of the voltage difference between the two pulse signals, in the whole ac cycle, and is output to the post-stage energy operation circuit 3 for energy measurement. Moreover, the absolute value of the voltage difference value of the two paths of pulse signals is directly obtained through discrete components, the method is strong in universality, high in reliability and low in cost, and can be used for various pulse signal comparison and conversion absolute value detection circuits.
As an alternative embodiment, the absolute value calculation circuit further includes a fifth capacitor C5; wherein:
a first end of the fifth capacitor C5 is connected to the second end of the eleventh resistor R11, the second end of the tenth resistor R10, the first end of the twelfth resistor R12, and the inverting input terminal of the third operational amplifier U3, respectively, and a second end of the fifth capacitor C5 is connected to the output end of the third operational amplifier U3, the second end of the twelfth resistor R12, and the input terminal of the energy operation circuit 3, respectively.
Further, the absolute value calculation circuit of the present application may further include a fifth capacitor C5, and the operation principle thereof is as follows: the fifth capacitor C5 functions to phase compensate the third operational amplifier U3.
As an alternative embodiment, the first switch D1 is specifically:
a first diode having a cathode as a first terminal of the first switch D1 and an anode as a second terminal of the first switch D1;
the second switch D2 specifically is:
a second diode having a cathode as a first terminal of the second switch D2 and an anode as a second terminal of the second switch D2.
Specifically, the first switch D1 and the second switch D2 of the present application can both be uncontrolled switches such as diodes, that is, the diodes can be automatically turned on and off according to the voltage conditions at two ends, so that the first switch D1 and the second switch D2 do not need to be separately controlled to be turned on and off.
As an alternative embodiment, the second operational amplifier U2 is embodied as a high slew rate operational amplifier.
Specifically, the second operational amplifier U2 of the present application may be a high slew rate operational amplifier, which is not particularly limited in the present application.
In the present application, specific explanation will be given by taking an example in which VCC is 3.3V, C1, C2, C3, C4 are 1Uf, R5, R6 are 1K, R1, R2, R3, R4 are 10K, R7 is 100 Ω, R8, R9, R11 are 10K, R10, R12 are 20K, and C5 is 0.47 Uf:
when the first pulse signal U1 is input, the first capacitor C1, the first resistor R1, the third resistor R3, and the third capacitor C3 form an ac path, and at this time, the magnitude of U3 is the sum of the divided voltage of the ac path and the divided voltage of the dc power source VCC, that is, U3 is 0.5U1+1.65V, U4 is 0.5U1+1.65V, and at the same time, the output U5 of the first operational amplifier U1 is U1-U2+3.3V, and V1 is U1-U2 after passing through the fourth capacitor C4.
When V1 is in a positive state, the first diode is turned on, the second diode is turned off, the second operational amplifier U2 is in a reverse gain state, the output voltage V2 of the second operational amplifier U2 is equal to-V1, and the output voltage Vout of the third operational amplifier U3 is equal to V1 equal to U1-U2.
When V1 is in a negative state, the first diode is turned off, the second diode is turned on, and at this time, the output voltage V2 of the second operational amplifier U2 is 0V, and the output voltage Vout of the third operational amplifier U3 is-V1- (U1-U2).
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A dual pulse signal comparison detection circuit, comprising:
the pulse acquisition circuit is used for respectively acquiring pulse signals on the two signal lines to obtain a first pulse signal and a second pulse signal;
the pulse comparison circuit is used for comparing the first pulse signal with the second pulse signal to obtain the absolute value of the voltage difference value of the first pulse signal and the second pulse signal;
and the energy operation circuit is used for obtaining pulse difference energy according to the absolute value operation of the voltage difference so as to determine the actual cancellation condition of the two pulse signals based on the pulse difference energy.
2. The dual-channel pulse signal comparison detection circuit of claim 1, wherein the pulse acquisition circuit comprises a first capacitor, a second capacitor, a first resistor and a second resistor; wherein:
the first end of the first capacitor is connected with a pulse signal detection point of one signal line, the second end of the first capacitor is connected with the first end of the first resistor, the second end of the first resistor is connected with the pulse comparison circuit, the first end of the second capacitor is connected with a pulse signal detection point of the other signal line, the second end of the second capacitor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the pulse comparison circuit.
3. The dual pulse signal comparison detection circuit of claim 2, wherein the pulse comparison circuit comprises:
a difference value calculating circuit respectively connected to the second end of the first resistor and the second end of the second resistor, for subtracting the second pulse signal from the first pulse signal to obtain a voltage difference value between the first pulse signal and the second pulse signal;
and the absolute value solving circuit is connected with the output end of the difference solving circuit and is used for carrying out absolute value processing on the voltage difference to obtain the absolute value of the voltage difference.
4. The dual pulse signal comparing and detecting circuit according to claim 3, wherein the difference calculating circuit comprises a third resistor, a fourth resistor, a third capacitor and a first operational amplifier; wherein:
a first end of the third resistor is connected with a second end of the first resistor and a positive input end of the first operational amplifier respectively, a second end of the third resistor is connected with a first end of the third capacitor, a second end of the third capacitor is grounded, a negative input end of the first operational amplifier is connected with a second end of the second resistor and a first end of the fourth resistor respectively, a second end of the fourth resistor is connected with an output end of the first operational amplifier, and a common end of the fourth resistor is used as an output end of the difference value calculating circuit; the first resistor, the second resistor, the third resistor and the fourth resistor have the same resistance value.
5. The dual pulse signal comparing and detecting circuit according to claim 4, wherein the difference calculating circuit further includes a fifth resistor, a sixth resistor, a seventh resistor, and a fourth capacitor; wherein:
a first end of the fifth resistor is connected to a direct-current power supply, a second end of the fifth resistor is respectively connected with a first end of the sixth resistor, a first end of a third capacitor and a second end of the third resistor, a second end of the sixth resistor is grounded, a first end of the seventh resistor is respectively connected with an output end of the first operational amplifier and a second end of the fourth resistor, a second end of the seventh resistor is connected with a first end of the fourth capacitor, and a second end of the fourth capacitor is used as an output end of the difference value calculating circuit; wherein the resistance value of the third resistor is larger than the resistance value of the sixth resistor.
6. The dual pulse signal comparing and detecting circuit according to claim 3, wherein the absolute value calculating circuit includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second operational amplifier, a third operational amplifier, a first switch and a second switch; wherein:
a first end of the eighth resistor is connected to an output end of the difference value calculating circuit and a first end of the tenth resistor, a second end of the eighth resistor is connected to a first end of the ninth resistor, a first end of the second switch, and a reverse input end of the second operational amplifier, a forward input end of the second operational amplifier is grounded, an output end of the second operational amplifier is connected to a second end of the second switch and a first end of the first switch, a second end of the first switch is connected to a second end of the ninth resistor and a first end of the eleventh resistor, a second end of the eleventh resistor is connected to a second end of the tenth resistor, a first end of the twelfth resistor, and a reverse input end of the third operational amplifier, and a forward input end of the third operational amplifier is grounded, the output end of the third operational amplifier is respectively connected with the second end of the twelfth resistor and the input end of the energy operational circuit;
the resistance values of the eighth resistor, the ninth resistor and the eleventh resistor are equal, and the resistance values of the tenth resistor and the twelfth resistor are equal to 2 times of the resistance value of the eighth resistor; when the voltage difference value is a positive value, the first switch is turned on, and the second switch is turned off; when the voltage difference value is a negative value, the first switch is turned off, and the second switch is turned on.
7. The dual pulse signal comparison detection circuit of claim 6 wherein said absolute value evaluation circuit further comprises a fifth capacitor; wherein:
a first end of the fifth capacitor is connected to the second end of the eleventh resistor, the second end of the tenth resistor, the first end of the twelfth resistor, and the inverting input terminal of the third operational amplifier, respectively, and a second end of the fifth capacitor is connected to the output end of the third operational amplifier, the second end of the twelfth resistor, and the input terminal of the energy operational circuit, respectively.
8. The dual-channel pulse signal comparison detection circuit of claim 6, wherein the first switch is specifically:
a first diode having a cathode as a first terminal of the first switch and an anode as a second terminal of the first switch;
the second switch specifically is:
and the cathode is used as a first end of the second switch, and the anode is used as a second diode of a second end of the second switch.
9. The dual pulse signal comparison detection circuit of claim 6, wherein the second operational amplifier is a high voltage slew rate operational amplifier.
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