CN218897209U - Filter circuit and photoelectric conversion device - Google Patents
Filter circuit and photoelectric conversion device Download PDFInfo
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- CN218897209U CN218897209U CN202221650214.XU CN202221650214U CN218897209U CN 218897209 U CN218897209 U CN 218897209U CN 202221650214 U CN202221650214 U CN 202221650214U CN 218897209 U CN218897209 U CN 218897209U
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Abstract
The application discloses a filter circuit and a photoelectric conversion device. The filter circuit comprises a first filter circuit and a second filter circuit which are connected in series, wherein the input end of the first filter circuit is used for receiving a preset electric signal, the output end of the first filter circuit is connected with the input end of the second filter circuit, and the output end of the second filter circuit is set as the output end of the filter circuit; the first filter circuit and the second filter circuit comprise operational amplifiers, and the first filter circuit and the second filter circuit sequentially carry out filter processing on preset electric signals. The filtering circuit can perform two-stage filtering on the preset electric signal, so that the filtering effect on the noise of the preset electric signal can be improved.
Description
Technical Field
The application relates to the technical field of visual imaging equipment, in particular to a filter circuit and a photoelectric conversion device.
Background
Along with the progress of technology, digital multimedia technology is also continuously developed, 3D vision is applied to the industrial field nowadays, and laser scanning three-dimensional measurement technology has become an indispensable technology in the industrial field at present by virtue of the advantages of non-contact, high precision, wide application range and the like, so that the technology has high research value. The technology is widely applied to the fields of product defect inspection, automatic assembly, size measurement, cultural relic reconstruction, visual navigation and the like, and has very high practical value. Structural light super-resolution microscopes (StructureIlluminationMicroscopy, SIM) and the like have been proposed by researchers in various countries in 2006.
The working principle of the structured light super-resolution microscope is that laser emitted by a laser source irradiates an object to be measured through an objective lens, the object to be measured is irradiated by the laser to generate excitation light, and then a detection image corresponding to the optical signal is generated by collecting the optical signal of the excitation light.
In the prior art, an input circuit is generally used to convert an optical signal of excitation light into a corresponding electrical signal, and then the electrical signal is processed by a main control device to obtain a detection image corresponding to the optical signal. However, the electrical signal formed by the existing input circuit has a large interference noise, so that the finally formed detection image is affected.
Disclosure of Invention
The main objective of the present application is to provide a filter circuit and a photoelectric conversion device, which aim to solve the above technical problems.
In order to achieve the above objective, the present application proposes a filter circuit, which includes a first filter circuit and a second filter circuit connected in series, wherein an input end of the first filter circuit is used for receiving a preset electrical signal, an output end of the first filter circuit is connected with an input end of the second filter circuit, and an output end of the second filter circuit is set as an output end of the filter circuit;
the first filter circuit and the second filter circuit comprise operational amplifiers, and the first filter circuit and the second filter circuit sequentially carry out filter processing on the preset electric signals.
Optionally, the first filtering circuit includes: the first operational amplifier, the first resistor, the second resistor, the third resistor, the first capacitor and the second capacitor;
one end of the first resistor is arranged as an input end of the filter circuit, and the other end of the first resistor is electrically connected with a negative-phase input end of the first operational amplifier through the second resistor; one end of the first capacitor is connected with the connecting ends of the first resistor and the second resistor, and the other end of the first capacitor is grounded; one end of the second capacitor is connected with the second resistor and the connecting end of the negative phase input end of the first operational amplifier, and the other end of the second capacitor is connected with the output end of the first operational amplifier; one end of the third resistor is connected with the connecting ends of the first resistor and the second resistor, and the other end of the third resistor is connected with the output end of the first operational amplifier;
the second filter circuit includes: the second operational amplifier, the fourth resistor, the fifth resistor, the sixth resistor, the third capacitor and the fourth capacitor;
one end of the fourth resistor is connected with the output end of the first operational amplifier, and the other end of the fourth resistor is connected with the negative phase input end of the second operational amplifier through the fifth resistor; one end of the third capacitor is connected with the connecting ends of the fourth resistor and the fifth resistor, and the other end of the third capacitor is grounded; one end of the fourth capacitor is connected with the fifth resistor and the connecting end of the negative phase input end of the second operational amplifier, and the other end of the fourth capacitor is connected with the output end of the second operational amplifier; the output of the second operational amplifier is arranged as the output of the filter circuit.
Optionally, the filtering circuit further comprises a potential adjusting circuit;
the potential regulating circuit is connected with the non-inverting input end of the first operational amplifier or the second operational amplifier so as to regulate the potential of the first operational amplifier or the second operational amplifier.
Optionally, the potential regulating circuit includes a varistor, the varistor includes an anode access terminal, a cathode access terminal, and a potential regulating terminal, the anode access terminal and the cathode access terminal are used for an external power supply, and the potential regulating terminal is connected with the non-inverting input terminal of the first operational amplifier or the second operational amplifier.
Optionally, the first filter circuit further includes a fifth capacitor and a sixth capacitor, where one end of the fifth capacitor is connected to the connection ends of the first resistor and the second resistor, and the other end of the fifth capacitor is grounded; one end of the sixth capacitor is connected with the second resistor and the connecting end of the negative phase input end of the first operational amplifier, and the other end of the sixth capacitor is connected with the output end of the first operational amplifier; and/or
The second filter circuit further comprises a seventh capacitor and an eighth capacitor, one end of the seventh capacitor is connected with the connecting ends of the fourth resistor and the fifth resistor, and the other end of the seventh capacitor is grounded; one end of the eighth capacitor is connected with the fifth resistor and the connecting end of the negative phase input end of the second operational amplifier, and the other end of the eighth capacitor is connected with the output end of the second operational amplifier.
Optionally, the first operational amplifier and the second operational amplifier are both active operational amplifiers; and is also provided with
The first operational amplifier and the second operational amplifier are the same in model number.
Optionally, the first filtering circuit includes: the first operational amplifier, the first resistor, the second resistor, the third resistor, the first capacitor and the second capacitor;
one end of the first resistor is arranged as an input end of the filter circuit, and the other end of the first resistor is electrically connected with a negative-phase input end of the first operational amplifier through the second resistor; one end of the first capacitor is connected with the connecting ends of the first resistor and the second resistor, and the other end of the first capacitor is grounded; one end of the second capacitor is connected with the second resistor and the connecting end of the negative phase input end of the first operational amplifier, and the other end of the second capacitor is connected with the output end of the first operational amplifier; one end of the third resistor is connected with the connecting ends of the first resistor and the second resistor, and the other end of the third resistor is connected with the output end of the first operational amplifier;
the second filter circuit comprises a third operational amplifier, a seventh resistor, an eighth resistor, a ninth resistor and a ninth capacitor;
one end of the seventh resistor is connected with the output end of the first operational amplifier, the other end of the seventh resistor is connected with the non-inverting input end of the third operational amplifier, one end of the ninth capacitor is connected with the seventh resistor and the connecting part of the non-inverting input end of the third operational amplifier, and the other end of the ninth capacitor is grounded;
one end of the eighth resistor is grounded, and the other end of the eighth resistor is connected with the negative phase input end of the third operational amplifier;
one end of the ninth resistor is connected with the eighth resistor and the connecting part of the negative phase input end of the third operational amplifier, and the other end of the ninth resistor is connected with the output end of the third operational amplifier.
Optionally, the filtering circuit further includes an output circuit, where the output circuit is connected to an output end of the filtering circuit, and the output circuit is configured to be connected to a preset master control device, so as to send an electrical signal received from the filtering circuit to the master control device.
Optionally, the output circuit comprises a BNC connector.
In order to achieve the above object, the present application further proposes a photoelectric conversion device including a filter circuit as described above.
In the technical scheme provided by the application, the first filter circuit and the second filter circuit which are connected in series are adopted to carry out secondary filtering on the electric signal, so that the noise of the electric signal can be effectively reduced, and the transmission precision of the electric signal and the transmission stability of the electric signal are improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from the structures shown in these drawings without inventive effort to a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a filter circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of another embodiment of the filter circuit shown in FIG. 1;
FIG. 3 is a schematic diagram of another embodiment of a filter circuit provided herein;
FIG. 4 is a schematic diagram of another embodiment of a filter circuit provided herein;
fig. 5 is a schematic structural diagram of an embodiment of a photoelectric conversion device provided in the present application.
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that, in the embodiment of the present application, directional indications (such as up, down, left, right, front, and rear … …) are referred to, and the directional indications are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present application.
In order to solve the above-mentioned problems, the present application provides a filter circuit, and referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a filter circuit provided in the present application.
The filter circuit 10 includes a first filter circuit 110 and a second filter circuit 120 connected in series, wherein an input end of the first filter circuit 110 is used for receiving a preset electric signal, an output end of the first filter circuit 110 is connected with an input end of the second filter circuit 120, and an output end of the second filter circuit 120 is set as an output end of the filter circuit 10; the first filter circuit 110 and the second filter circuit 120 each include an operational amplifier, and the first filter circuit 110 and the second filter circuit 120 sequentially perform filtering processing on the electrical signals.
In the scheme of the application, the first filter circuit 110 and the second filter circuit 120 which are connected in series are adopted to carry out secondary filtering on the electric signal, so that the noise of the electric signal can be effectively reduced, and the transmission precision of the electric signal and the transmission stability of the electric signal are improved.
Wherein the first filter circuit 110 includes: the first operational amplifier 111, the first resistor R1, the second resistor R2, the third resistor R3, the first capacitor C1 and the second capacitor C2.
One end of the first resistor R1 is set as an input end of the filter circuit 10 for receiving an external electric signal, and the other end of the first resistor R1 is electrically connected with the negative phase input end 1112 of the first operational amplifier 111 through the second resistor R2; one end of the first capacitor C1 is connected with the connecting ends of the first resistor R1 and the second resistor R2, and the other end of the first capacitor C is grounded; one end of the second capacitor C2 is connected to the second resistor R2 and the connection end of the negative phase input end 1112 of the first operational amplifier 111, and the other end is connected to the output end 1113 of the first operational amplifier 111; one end of the third resistor R3 is connected to the connection end of the first resistor R1 and the second resistor R2, and the other end is connected to the output end 1113 of the first operational amplifier 111.
In this embodiment, the first resistor R1 and the first capacitor C1 may form an RC filter circuit; the second resistor R2 and the second capacitor C2 can form an RC filter circuit; the corresponding first filter circuit 110 may constitute a second order filter circuit.
The second filter circuit 120 includes: a second operational amplifier 121, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a third capacitor C3, and a fourth capacitor C4; one end of the fourth resistor R4 is connected to the output terminal 1113 of the first operational amplifier 111, and the other end of the fourth resistor R4 is connected to the negative phase input terminal 1212 of the second operational amplifier 121 via the fifth resistor R5; one end of the third capacitor C3 is connected with the connecting ends of the fourth resistor R4 and the fifth resistor R5, and the other end of the third capacitor C is grounded; one end of the fourth capacitor C4 is connected to the fifth resistor R5 and the connection end of the negative phase input end 1212 of the second operational amplifier 121, and the other end is connected to the output end 1213 of the second operational amplifier 121; the output 1213 of the second operational amplifier 121 is set as the output of the filter circuit 10.
Likewise, the fourth resistor R4 and the third capacitor C3 may form an RC filter circuit; the fifth resistor R5 and the fourth capacitor C4 can form an RC filter circuit; the corresponding second filter circuit 120 may constitute a second order filter circuit.
Therefore, in the embodiment, the first filter circuit 110 and the second filter circuit 120 are both second-order filter circuits, and the two filter circuits are connected in series to form a second-order filter circuit (fourth-order filter circuit), so that the transmission accuracy of the electrical signal and the stability of the transmission of the electrical signal can be greatly improved.
Wherein, optionally, the filter circuit 10 further comprises a potential adjusting circuit 130. The potential adjusting circuit 130 may be configured to be connected to the non-inverting input terminal of the first operational amplifier 111 or the second operational amplifier 121 to adjust the potential of the first operational amplifier 111 or the second operational amplifier 112, so as to adjust the offset voltage of the first operational amplifier 111 or the second operational amplifier 112, thereby improving the signal-to-noise ratio of the signal transmitted by the whole filter circuit 10.
Specifically, referring to fig. 1, in the present embodiment, the potential adjusting circuit 130 is connected to the non-inverting input 1111 of the first operational amplifier 111 for adjusting the potential of the first operational amplifier 111.
The potential adjusting circuit 130 may include a varistor 131, where the varistor 131 includes a positive access terminal 1311, a negative access terminal 1312, and a potential adjusting terminal 1313, the positive access terminal 1311 and the negative access terminal 1312 are used for external power supply, and the potential adjusting terminal 1313 is connected to the positive input terminal 1111 of the first operational amplifier 111. At this time, the non-inverting input terminal 1211 of the corresponding second operational amplifier 121 is grounded.
The positive electrode access terminal 1311 and the negative electrode access terminal 1312 may be respectively connected to different potentials, and by adjusting the potential adjusting terminal 1313, the potential of the positive input terminal 1111 of the first operational amplifier 111 may be adjusted, so that the offset voltage of the first operational amplifier 111 may be adjusted, and the signal-to-noise ratio of the signal transmitted by the first filter circuit 110 may be improved.
Alternatively, the potential adjusting circuit 130 may be further connected to the non-inverting input terminal 1211 of the second operational amplifier 121 to adjust the potential of the non-inverting input terminal 1211 of the second operational amplifier 121, so as to adjust the offset voltage of the second operational amplifier 121 and improve the signal-to-noise ratio of the signal transmitted by the second filter circuit 120. At this time, the non-inverting input 1111 of the corresponding first operational amplifier 111 is grounded.
Alternatively, the number of the potential adjusting circuits 130 may be two, and the two potential adjusting circuits 130 may be respectively connected to the non-inverting input terminal 1111 of the first operational amplifier 111 and the non-inverting input terminal 1211 of the second operational amplifier 121, so that offset voltages of the first operational amplifier 111 and the second operational amplifier 121 may be respectively adjusted by the two potential adjusting circuits 130, thereby further improving the signal-to-noise ratio of the transmission signal of the filter circuit 10.
In this embodiment, further, to improve the effect of the RC filter circuit, an additional capacitor may be added to the corresponding RC filter circuit.
Please further refer to fig. 2. Fig. 2 is a schematic diagram of another embodiment of the filter circuit shown in fig. 1.
The first filter circuit 110 further includes a fifth capacitor C5 and a sixth capacitor C6, wherein one end of the fifth capacitor C5 is connected to the connection ends of the first resistor R1 and the second resistor R2, and the other end is grounded; one end of the sixth capacitor C6 is connected to the second resistor R2 and the connection terminal of the negative input terminal 1112 of the first operational amplifier 111, and the other end is connected to the output terminal 1113 of the first operational amplifier 111. The capacitance values of the fifth capacitor C5 and the first capacitor C1 are different, and the capacitance values of the sixth capacitor C6 and the second capacitor C2 are different, so that interference signals with different frequencies can be filtered.
Similarly, the second filter circuit 120 may also include a seventh capacitor C7 and an eighth capacitor C8, where one end of the seventh capacitor C7 is connected to the connection ends of the fourth resistor R4 and the fifth resistor R5, and the other end is grounded; one end of the eighth capacitor C8 is connected to the fifth resistor R5 and the connection terminal of the negative input terminal 1212 of the second operational amplifier 121, and the other end is connected to the output terminal 1213 of the second operational amplifier 121. The capacitance values of the seventh capacitor C7 and the third capacitor C3 are different, and the capacitance values of the eighth capacitor C8 and the fourth capacitor C4 are different, so that interference signals with different frequencies can be filtered.
In the present embodiment, a fifth capacitor C5 and a sixth capacitor C6 are added to the first filter circuit 110, and a seventh capacitor C7 and an eighth capacitor C8 are added to the second filter circuit 120. Alternatively, in other embodiments, the first filter circuit 110 and the second filter circuit 120 may be provided with only the fifth capacitor C5 and the sixth capacitor C6, or may be provided with only the seventh capacitor C7 and the eighth capacitor C8, respectively, in the first filter circuit 110 and the second filter circuit 120.
Wherein, optionally, the first operational amplifier 111 and the second operational amplifier 121 are active operational amplifiers; and the first operational amplifier 111 and the second operational amplifier 121 are identical in model. In other embodiments, the first operational amplifier 111 and the second operational amplifier 121 may also be integrated in the same operational amplifier.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another embodiment of a filter circuit provided in the present application.
The first filter circuit 110 in this embodiment may be the same as the first filter circuit 110 described above, and will not be described herein.
The difference is that, in the present embodiment, the second filter circuit 120 includes a third operational amplifier 123, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a ninth capacitor C9; one end of the seventh resistor C7 is connected to the output terminal 1113 of the first operational amplifier 111, the other end is connected to the non-inverting input terminal 1231 of the third operational amplifier 123, one end of the ninth capacitor C9 is connected to the seventh resistor R7 and the connecting portion of the non-inverting input terminal 1231 of the third operational amplifier 123, and the other end is grounded; one end of the eighth resistor R8 is grounded, and the other end of the eighth resistor R8 is connected with the negative phase input end 1232 of the third operational amplifier 123; one end of the ninth resistor R9 is connected to the eighth resistor R8 and the connection portion of the negative input terminal 1232 of the third operational amplifier 123, and the other end of the ninth resistor R9 is connected to the output terminal 1233 of the third operational amplifier 123.
In the above embodiment, the output terminal 1113 of the first operational amplifier 111 is connected to the non-inverting input terminal 1231 of the third operational amplifier 123 through the seventh resistor R7.
In other embodiments, the output 1113 of the first operational amplifier 111 is connected to the negative input 1232 of the third operational amplifier 123 through the seventh resistor R7. Further, in the present embodiment, one end of the ninth capacitor C9 is connected to the connection portion of the seventh resistor R7 and the negative input terminal 1232 of the third operational amplifier 123, and the other end is grounded; one end of the eighth resistor R8 is grounded, and the other end of the eighth resistor R8 is connected with a non-inverting input end 1231 of the third operational amplifier 123; one end of the ninth resistor R9 is connected to the eighth resistor R8 and the connection portion of the non-inverting input terminal 1231 of the third operational amplifier 123, and the other end of the ninth resistor R9 is connected to the output terminal 1233 of the third operational amplifier 123.
In this embodiment, the ninth capacitor C9 and the seventh resistor R7 may form an RC low-pass filter circuit, so that the filtering process may be performed on the high-frequency noise signal; the second filter circuit 120 may then constitute a first order filter circuit. The first filter circuit 110 and the second filter circuit 120 in this embodiment are connected in series to form a third-order filter circuit, so as to ensure the filtering effect on the electrical signal.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another embodiment of a filter circuit provided in the present application.
In this embodiment, the filter circuit 10 also includes a first filter circuit 110 and a second filter circuit 120. The first filter circuit 110 in this embodiment may be the same as the second filter circuit in the embodiment shown in fig. 3; the second filter circuit 120 in this embodiment may be the same as the first filter circuit in the embodiment shown in fig. 3. The specific structure and connection relationship are referred to above, and are not described herein.
Further, the filter circuit 10 provided in the present application may further include an output circuit 140. The output circuit 140 is connected to an output end of the filter circuit 10 (specifically, to an output end of the second filter circuit 120), and the output circuit 140 is used for being connected to a preset master device to send the electric signal received from the filter circuit 10 to the master device.
Alternatively, the output circuit 140 may include a BNC (Bayonet Nut Connector ) connector.
Based on the same inventive concept, the application also provides a photoelectric conversion device. Referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of a photoelectric conversion device provided in the present application.
Among them, the photoelectric conversion apparatus 20 may include the photoelectric conversion device 210, the amplifying circuit 220, and the filter circuit 10 as described above. The photoelectric conversion device 210 may be configured to receive an optical signal and convert the optical signal into an identifiable electrical signal corresponding to the optical signal, the amplifying circuit 220 may receive the electrical signal converted by the photoelectric conversion device 210 and amplify the electrical signal, and the filtering circuit 10 is connected to an output end of the amplifying circuit 220 to receive the electrical signal amplified by the amplifying circuit 220 and further perform filtering processing on the electrical signal. The output end of the filter circuit 10 may be coupled to a preset main control device, and the main control device may process the electric signal after the filter circuit 10 filters, so as to image.
Based on the same inventive concept, the application also provides a confocal imaging system. The confocal imaging system includes a laser light source, a light source light path component, a microscopic imaging device, a master control device, and a photoelectric conversion device 20 as described above.
The laser light source can emit laser, the light path component of the light source can carry out light path adjustment on the laser, the laser is conducted to the objective lens, the laser is led to the object to be detected through the objective lens of the microscopic imaging device, the object to be detected can emit excitation light after being irradiated by the laser, the excitation light can return along the objective lens and be conducted to the receiving end of the photoelectric conversion device 20, the optical signal of the excitation light is converted into an electrical signal which can be recognized by the main control device through the photoelectric conversion device 20, and then the electrical signal can be processed through the main control device, so that imaging is achieved.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the claims, and all equivalent structural changes made in the present application and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the present application.
Claims (8)
1. The filter circuit is characterized by comprising a first filter circuit and a second filter circuit which are connected in series, wherein the input end of the first filter circuit is used for receiving a preset electric signal, the output end of the first filter circuit is connected with the input end of the second filter circuit, and the output end of the second filter circuit is set as the output end of the filter circuit;
the first filter circuit and the second filter circuit comprise operational amplifiers, and the first filter circuit and the second filter circuit sequentially carry out filter processing on the preset electric signals;
the first filter circuit includes: the first operational amplifier, the first resistor, the second resistor, the third resistor, the first capacitor and the second capacitor;
one end of the first resistor is arranged as an input end of the filter circuit, and the other end of the first resistor is electrically connected with a negative-phase input end of the first operational amplifier through the second resistor; one end of the first capacitor is connected with the connecting ends of the first resistor and the second resistor, and the other end of the first capacitor is grounded; one end of the second capacitor is connected with the second resistor and the connecting end of the negative phase input end of the first operational amplifier, and the other end of the second capacitor is connected with the output end of the first operational amplifier; one end of the third resistor is connected with the connecting ends of the first resistor and the second resistor, and the other end of the third resistor is connected with the output end of the first operational amplifier;
the second filter circuit includes: the second operational amplifier, the fourth resistor, the fifth resistor, the sixth resistor, the third capacitor and the fourth capacitor;
one end of the fourth resistor is connected with the output end of the first operational amplifier, and the other end of the fourth resistor is connected with the negative phase input end of the second operational amplifier through the fifth resistor; one end of the third capacitor is connected with the connecting ends of the fourth resistor and the fifth resistor, and the other end of the third capacitor is grounded; one end of the fourth capacitor is connected with the fifth resistor and the connecting end of the negative phase input end of the second operational amplifier, and the other end of the fourth capacitor is connected with the output end of the second operational amplifier; the output end of the second operational amplifier is set as the output end of the filter circuit;
the filter circuit further comprises a potential regulating circuit;
the potential regulating circuit is connected with the non-inverting input end of the first operational amplifier or the second operational amplifier so as to regulate the potential of the first operational amplifier or the second operational amplifier.
2. The filter circuit of claim 1, wherein the filter circuit comprises a filter circuit,
the potential regulating circuit comprises a rheostat, the rheostat comprises an anode access end, a cathode access end and a potential regulating end, the anode access end and the cathode access end are used for externally connecting a power supply, and the potential regulating end is connected with a positive input end of the first operational amplifier or the second operational amplifier.
3. The filter circuit of claim 1, wherein the filter circuit comprises a filter circuit,
the first filter circuit further comprises a fifth capacitor and a sixth capacitor, one end of the fifth capacitor is connected with the connecting ends of the first resistor and the second resistor, and the other end of the fifth capacitor is grounded; one end of the sixth capacitor is connected with the second resistor and the connecting end of the negative phase input end of the first operational amplifier, and the other end of the sixth capacitor is connected with the output end of the first operational amplifier; and/or
The second filter circuit further comprises a seventh capacitor and an eighth capacitor, one end of the seventh capacitor is connected with the connecting ends of the fourth resistor and the fifth resistor, and the other end of the seventh capacitor is grounded; one end of the eighth capacitor is connected with the fifth resistor and the connecting end of the negative phase input end of the second operational amplifier, and the other end of the eighth capacitor is connected with the output end of the second operational amplifier.
4. The filter circuit of claim 1, wherein the filter circuit comprises a filter circuit,
the first operational amplifier and the second operational amplifier are active operational amplifiers; and is also provided with
The first operational amplifier and the second operational amplifier are the same in model number.
5. The filter circuit of claim 1, wherein the filter circuit comprises a filter circuit,
the second filter circuit comprises a third operational amplifier, a seventh resistor, an eighth resistor, a ninth resistor and a ninth capacitor;
one end of the seventh resistor is connected with the output end of the first operational amplifier, the other end of the seventh resistor is connected with the non-inverting input end of the third operational amplifier, one end of the ninth capacitor is connected with the seventh resistor and the connecting part of the non-inverting input end of the third operational amplifier, and the other end of the ninth capacitor is grounded;
one end of the eighth resistor is grounded, and the other end of the eighth resistor is connected with the negative phase input end of the third operational amplifier;
one end of the ninth resistor is connected with the eighth resistor and the connecting part of the negative phase input end of the third operational amplifier, and the other end of the ninth resistor is connected with the output end of the third operational amplifier.
6. A filter circuit according to any one of claims 1 to 5, wherein,
the filter circuit further comprises an output circuit, wherein the output circuit is connected to the output end of the filter circuit and is used for being connected with a preset main control device so as to send the electric signal received from the filter circuit to the main control device.
7. The filter circuit of claim 6, wherein the filter circuit comprises a filter circuit,
the output circuit includes a BNC connector.
8. A photoelectric conversion apparatus, characterized in that the photoelectric conversion apparatus comprises the filter circuit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221650214.XU CN218897209U (en) | 2022-06-29 | 2022-06-29 | Filter circuit and photoelectric conversion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221650214.XU CN218897209U (en) | 2022-06-29 | 2022-06-29 | Filter circuit and photoelectric conversion device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218897209U true CN218897209U (en) | 2023-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221650214.XU Active CN218897209U (en) | 2022-06-29 | 2022-06-29 | Filter circuit and photoelectric conversion device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218897209U (en) |
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2022
- 2022-06-29 CN CN202221650214.XU patent/CN218897209U/en active Active
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