CN217213671U - Signal processing circuit, infrared receiving module and electronic equipment - Google Patents
Signal processing circuit, infrared receiving module and electronic equipment Download PDFInfo
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- CN217213671U CN217213671U CN202123086572.0U CN202123086572U CN217213671U CN 217213671 U CN217213671 U CN 217213671U CN 202123086572 U CN202123086572 U CN 202123086572U CN 217213671 U CN217213671 U CN 217213671U
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Abstract
The application provides a signal processing circuit, an infrared receiving module and electronic equipment, wherein the signal processing circuit comprises a receiving module, a first switching tube, a first operational amplifier and a first resistor; the first current input end of the first switching tube is connected to the first inverting input end of the first operational amplifier, the first current output end of the first switching tube is grounded, and the first controlled end of the first switching tube is connected to the signal output end of the receiving module; a first non-inverting input end of the first operational amplifier is connected to a first reference power supply, a first power supply input end of the first operational amplifier is connected to a first auxiliary power supply, and a first operational amplifier output end of the first operational amplifier is connected to the back-end circuit; the first resistor is connected in parallel between the first operational amplifier output end and the first inverting input end of the first operational amplifier. The signal processing circuit can suppress noise interference in the circuit and has high signal-to-noise ratio of the infrared touch signal by supplying power to the switching tube for processing the signal by using the operational amplifier and performing current-voltage conversion and signal amplification on the output current on the operational amplifier.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a signal processing circuit, infrared receiving module and electronic equipment.
Background
At present, many large-screen devices such as interactive flat panels and the like have a touch function, the touch function is realized by installing an infrared touch frame on a frame of a display screen, and the infrared touch frame is provided with a corresponding infrared signal processing circuit. As shown in fig. 1, in a general infrared signal processing circuit, an infrared receiving tube D11 generates a photocurrent signal after receiving infrared light, the photocurrent signal is amplified by a transistor Q11, then is converted into a voltage signal by a resistor R11 through current-voltage conversion, and then is filtered by a filter capacitor C11 to obtain an effective infrared light signal, and the infrared light signal is amplified by an operational amplifier U11 and a resistor R12, so that a pre-amplification process of the infrared signal processing is completed.
However, in the infrared signal processing circuit, when the transistor Q11 amplifies the photocurrent signal, an auxiliary power supply is introduced into the collector of the transistor Q11 to cause a certain noise interference, and in the circuit structure, a mode of current-voltage conversion only through a resistor may cause a large noise interference, so that the signal-to-noise ratio of the finally obtained infrared touch signal is not high.
SUMMERY OF THE UTILITY MODEL
For overcoming the problem that exists among the correlation technique, the embodiment of the utility model provides a signal processing circuit, infrared receiving module and electronic equipment, signal processing circuit carries out the current-voltage conversion through the feedback resistance on the operational amplifier, can restrain the noise interference in the circuit for the signal processing circuit finally obtains the signal-to-noise ratio of infrared touch signal than higher.
According to a first aspect of embodiments of the present invention, there is provided a signal processing circuit, including a receiving module, a first switch tube, a first operational amplifier, and a first resistor; the first switch tube is provided with a first current input end, a first current output end and a first controlled end; the first operational amplifier is provided with a first non-inverting input end, a first power supply input end and a first operational amplifier output end; the first current input end of the first switching tube is connected to the first inverting input end of the first operational amplifier, the first current output end of the first switching tube is grounded, the first controlled end of the first switching tube is connected to the signal output end of the receiving module, and the first switching tube is used for controlling the current signal amplification of the first inverting input end according to the output signal of the signal output end; the first non-inverting input end of the first operational amplifier is connected to a first reference power supply, the first power supply input end of the first operational amplifier is connected to a first auxiliary power supply, and the first operational amplifier output end of the first operational amplifier is connected to the back-end circuit; the first resistor is connected between the first operational amplifier output end and the first inverting input end of the first operational amplifier in parallel; the first operational amplifier and the first resistor are used for amplifying and converting the current signal of the first inverting input end into voltage.
According to a second aspect of the embodiments of the present invention, there is provided an infrared receiving module, comprising the signal processing circuit and the processor as described in the above embodiments; the amplified signal output end of the signal processing circuit is electrically connected with the input end of the processor.
According to the third aspect of the embodiment of the present invention, an electronic device is provided, which comprises the infrared receiving module and the infrared transmitting module as above embodiments.
Use the technical scheme of the utility model, signal processing circuit, the signal of telecommunication that receiving module produced carries out the current-voltage conversion, carries out again after the voltage-current conversion output to operational amplifier's inverting input to carry out the current-voltage conversion once more through the feedback resistance on the operational amplifier, can restrain the noise interference in the circuit, make the infrared touch signal noise that finally obtains less, signal-to-noise ratio is higher.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of an infrared signal processing circuit in the prior art;
fig. 2 is a schematic block diagram of a signal processing circuit according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of a signal processing circuit according to a second embodiment of the present invention;
fig. 4 is a schematic block diagram of an infrared receiving module according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, the first information may also be referred to as second information, and similarly, the second information may also be referred to as first information, without departing from the scope of the present invention.
In the infrared signal processing circuit in the prior art, when the triode amplifies the photocurrent signal, an auxiliary power supply is introduced into the collector of the triode to bring certain noise interference, and in the circuit structure, the mode of only converting current and voltage through the resistor can cause large noise interference, so that the signal-to-noise ratio of the finally obtained infrared touch signal is not high.
In order to solve the above problem, an embodiment of the present invention provides a signal processing circuit, which performs current-voltage conversion and amplification through a feedback resistor on an operational amplifier, and can suppress noise interference in the circuit, so that the signal-to-noise ratio of the infrared touch signal finally obtained by the signal processing circuit is higher.
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In this embodiment, the signal processing circuit is applied to signal processing of the infrared touch device, and since the infrared touch signal is a weak signal, it is easily interfered during a previous stage of amplification processing, resulting in a low signal-to-noise ratio, thereby affecting touch control and writing effects of the infrared touch device.
According to the utility model discloses the first aspect of the embodiment provides a signal processing circuit, improves infrared touch signal processing circuit, can obtain the infrared touch signal that the signal to noise ratio is higher to improve infrared touch device's touch control and write the performance. Referring to fig. 2, fig. 2 is a schematic diagram of a signal processing circuit according to an embodiment of the present invention.
The signal processing circuit comprises a receiving module 11, a first switching tube 12, a first operational amplifier 13 and a first resistor 14; the first switch tube 12 has a first current input end, a first current output end and a first controlled end; the first operational amplifier 13 has a first non-inverting input terminal, a first power input terminal, and a first operational amplifier output terminal; the first switch tube 12 has a first current input end connected to the first inverting input end of the first operational amplifier 13, a first current output end grounded, and a first controlled end connected to the signal output end of the receiving module 11, and is configured to control the current signal amplification of the first inverting input end according to the output signal of the signal output end. A first non-inverting input end of the first operational amplifier 13 is connected to a first reference power supply, a first power supply input end thereof is connected to a first auxiliary power supply, and a first operational amplifier output end thereof is connected to the back-end circuit; the first resistor 14 is connected in parallel between the first operational amplifier output end and the first inverting input end of the first operational amplifier 13; the first operational amplifier and the first resistor are used for amplifying and converting the current signal of the first inverting input end into voltage.
In this embodiment, the signal output end of the receiving module 11 outputs an optical electrical signal, the optical electrical signal is in a current form and can be regarded as a constant current source, the optical electrical signal is converted by the first switch tube 12, the current signal at the inverting input end of the first operational amplifier 13 is amplified at the first current input end of the first switch tube 12, and after the amplification and conversion by the first resistor 14 and the first operational amplifier 13, a voltage signal is obtained, and the voltage signal is transmitted to the back-end circuit after the processing of the front-end signal of the infrared touch device is completed. For infrared signal processing circuit among the prior art, in this embodiment, the in-process that receives the back-end circuit from the front end carries out current-voltage conversion, utilizes the advantage that current signal long distance transmission interference killing feature is strong, just turns into the voltage with the electric current at the back-end circuit, can effectively restrain the noise interference in the circuit for the infrared touch signal noise that obtains is less, and signal-to-noise ratio is higher.
In this embodiment, the receiving module 11 includes an optical receiver D21 and a second resistor RVE1, one end of the optical receiver D21 is connected to the second auxiliary power source V0, the other end is a signal output end of the receiving module 11 and is connected to the first controlled end of the first switch tube 12, and the second resistor RVE1 is connected in parallel to two ends of the optical receiver D21.
The light receiver is a photodiode D21, the cathode of the photodiode D21 is connected to a second auxiliary power supply V0 to obtain the working power supply, and the anode thereof is connected to the first controlled terminal of the first switch tube 12.
In an alternative embodiment, the first switch tube 12 may be a first transistor Q21, the collector C of the first transistor Q21 is a first current input terminal of the first switch tube Q21, the emitter E of the first transistor Q21 is a first current output terminal of the first switch tube 12, and the base B of the first transistor Q21 is a first controlled terminal of the first switch tube 12.
When the first transistor Q21 is operating as a controlled constant current source, the current flows from the output terminal of the operational amplifier 13 (i.e., U21 in this embodiment) through the first resistor 14(R21) and the collector and emitter of the transistor Q21 to the ground, i.e., the reverse phase current is formed in the first operational amplifier 13 and the transistor Q21.
The first operational amplifier U21 actually indirectly supplies power to the first transistor Q21, and the first operational amplifier has a much higher power ripple rejection capability than the power supply commonly used in the prior art circuit, so that noise interference caused by the auxiliary power supply can be effectively suppressed during the current-voltage conversion and amplification processes.
Under the conversion and amplification action of the first operational amplifier U21 and the first resistor 14(R21), the voltage thermal noise generated by the resistor is unchanged, and the effective current signal is converted into a voltage signal for amplification, which further improves the signal-to-noise ratio compared with the prior art, and then a voltage signal is output at the output end of the first operational amplifier U21, i.e., an infrared touch signal is output to the back-end circuit, or to the processor of the infrared touch device. The first transistor Q21 is an NPN transistor, and the type thereof is not limited.
In an alternative embodiment, the emitter of the first transistor Q21 is grounded through a matching resistor R22, and a filter capacitor C21 is further connected in parallel to two ends of the matching resistor R22.
In other embodiments, the first switch 12 may be a field effect MOS transistor, or other switching device.
In this embodiment, the first operational amplifier 13(U21) has a first non-inverting input (pin 3 of U21), a first inverting input (pin 2 of U21), a first power input (pin 4 of U21), and a first operational amplifier output (pin 1 of U21). A feedback resistor, i.e., a first resistor R21, is connected in parallel between the first inverting input terminal and the first operational amplifier output terminal of the first operational amplifier 13(U21) to determine the voltage amplification factor of the operational amplifier U21.
Furthermore, a first capacitor C23 is connected in parallel between the operational amplifier output terminal (the first pin of U21) and the first inverting input terminal (the 2 nd pin of U21) of the first operational amplifier 13, and the first capacitor C23 is arranged to prevent the circuit from self-oscillation, and simultaneously generate a certain suppression effect on noise interference in the circuit, thereby further improving the quality of the infrared touch signal.
Further, the first non-inverting input terminal of the first operational amplifier 13 is connected to a reference power source VREF1 through a matching resistor R23, and a filter capacitor C22 is connected in parallel to two ends of the matching resistor R23 for filtering interference of the reference power source. The reference source VREF1 may provide a reference voltage to obtain an output voltage with a suitable amplification factor at the first operational amplifier output of the first operational amplifier 13.
Because the infrared touch signal belongs to a weak signal, the transmission capacity of the infrared touch signal is still weak after the infrared touch signal is processed by a preceding stage, and the infrared touch signal cannot be transmitted at a longer distance. In order to enable the infrared touch signal to be transmitted over a long distance, in an optional embodiment, a second-stage amplifying circuit, that is, a second amplifying circuit, is further disposed in the signal processing circuit.
Referring to fig. 3, fig. 3 is a schematic diagram of a signal processing circuit according to an embodiment of the present invention.
The second amplifying circuit comprises a second switching tube Q22, a second operational amplifier U22 and a third resistor R25; the second switch tube Q22 has a second current input end, a second current output end and a second controlled end; the second operational amplifier U22 has a second non-inverting input (pin 3 of U22), a second inverting input (pin 2 of U22), a second power input (pin 4 of U22), and a second operational amplifier output (pin 1 of U22); a second current input end of the second switching tube Q22 is connected to a second inverting input end of the second operational amplifier U22, a second current output end thereof is grounded, and a second controlled end thereof is connected to the first operational amplifier output end V-OUT1 of the first operational amplifier U21; a second non-inverting input terminal of the second operational amplifier U22 is connected to a second reference power source VREF2, a second power source input terminal thereof is connected to a third auxiliary power source VCC2, and a second operational amplifier output terminal thereof is connected to the processor; the third resistor R25 is connected in parallel between the second inverting input terminal and the second operational amplifier output terminal of the second operational amplifier U22.
In an alternative embodiment, the second switching transistor Q22 may be a second transistor Q22, and the second transistor Q22 may be an NPN transistor. A collector C of the second transistor Q22 is a second current input terminal of the second switch tube, an emitter E of the second transistor Q22 is a second current output terminal of the second switch tube, and a base B of the second transistor Q22 is a second controlled terminal of the second switch tube. The emitter of the second triode Q22 is grounded through a matching resistor R25, and both ends of the matching resistor R25 are also connected in parallel with a filter capacitor C24. The specific type of the second transistor Q22 is not limited.
In other embodiments, the second switching transistor Q22 may be a fet or other switching device.
The infrared touch signal output by the pre-stage amplifying circuit is a voltage signal V-OUT1, and when the voltage signal V-OUT1 is greater than the turn-on voltage of the second transistor Q22, the collector and the emitter of the second transistor Q22 are turned on, so that a current signal exists at the inverting input terminal of the second operational amplifier U22, and the current signal flows to the ground terminal of the circuit through the collector and the emitter of the second transistor Q22, that is, a reverse current signal is formed at the second inverting input terminal of the second operational amplifier U22. Under the amplification and conversion actions of the second operational amplifier U22 and the third resistor R25, the voltage signal V-OUT2 subjected to secondary processing is output at the first operational amplifier output end of the second operational amplifier U22, namely, an infrared touch signal is output, and the infrared touch signal is output to a processor of the infrared touch device. The second transistor Q22 is an NPN transistor, and the type thereof is not limited. The specific type of the second operational amplifier U22 is not limited.
Furthermore, the secondary amplifying circuit further comprises a second capacitor C26, the second capacitor C26 is connected in parallel between the second inverting input terminal of the second operational amplifier U22 and the second operational amplifier output terminal, and the second capacitor C26 is arranged to prevent the circuit from generating self-oscillation and simultaneously generate a certain suppression effect on noise interference in the circuit, so that the quality of the infrared touch signal is further improved.
The second non-inverting input terminal of the second operational amplifier U22 is connected to the reference power source VREF2 through the matching resistor R26, and a filter capacitor C25 is further connected in parallel to two ends of the matching resistor R26 for filtering interference of the reference power source. The reference voltage source VREF2 may provide a reference voltage to obtain an output voltage with a suitable amplification factor at the first operational amplifier output of the second operational amplifier U22.
Use the utility model discloses technical scheme, signal processing circuit, the signal of telecommunication that receiving module produced carry out the current-voltage conversion, carry out again after the voltage-current conversion output to operational amplifier's inverting input to carry out the current-voltage conversion once more through the feedback resistance on the operational amplifier, can restrain the noise interference in the circuit, make the infrared touch signal noise that finally obtains less, signal-to-noise ratio is higher. Meanwhile, the secondary amplifying circuit is arranged, so that the infrared touch signals can be transmitted in a longer distance, and the performance of the infrared touch device is improved.
According to a second aspect of the embodiment of the present invention, an infrared receiving module is provided, please refer to fig. 4, and fig. 4 is a schematic block diagram of an infrared receiving module according to an embodiment of the present invention.
The infrared receiving module includes the signal processing circuit 10 and the processor 20 as in the above embodiments; the amplified signal output end of the signal processing circuit 10 is electrically connected with the input end of the processor 20, and after an interference signal in the circuit is filtered, a useful signal generated by the first optical receiver is transmitted to the processor 20, so that the signal-to-noise ratio is high, and the performance of the infrared touch screen is good.
According to a third aspect of the embodiment of the present invention, an electronic device is provided, please refer to fig. 5, and fig. 5 is a schematic structural diagram of the electronic device according to the embodiment of the present invention.
The electronic device comprises an infrared receiving module and an infrared transmitting module, wherein the infrared receiving module comprises the signal processing circuit and the processor of the above embodiment.
In an alternative embodiment, the electronic device may be an interactive tablet 500, a display screen 520 is installed in a frame 510 of the interactive tablet 500, an infrared receiving module 530 and an infrared transmitting module 540 are installed on the frame 510 of the interactive tablet 500, the infrared transmitting module 540 is configured to transmit an infrared light signal, and the infrared receiving module 530 is configured to receive the infrared light signal transmitted by the infrared transmitting module 540 and generate a corresponding electrical signal.
In other embodiments, the electronic device may be other smart devices with touch screens.
Use the technical scheme of the utility model, signal processing circuit, the signal of telecommunication that receiving module produced carries out the current-voltage conversion, carries out again after the voltage-current conversion output to operational amplifier's inverting input to carry out the current-voltage conversion once more through the feedback resistance on the operational amplifier, can restrain the noise interference in the circuit, make the infrared touch signal noise that finally obtains less, signal-to-noise ratio is higher.
The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (10)
1. A signal processing circuit is characterized by comprising a receiving module, a first switching tube, a first operational amplifier and a first resistor;
the first switch tube is provided with a first current input end, a first current output end and a first controlled end;
the first operational amplifier is provided with a first non-inverting input end, a first power supply input end and a first operational amplifier output end;
the first current input end of the first switch tube is connected to the first inverting input end of the first operational amplifier, the first current output end of the first switch tube is grounded, the first controlled end of the first switch tube is connected to the signal output end of the receiving module, and the first switch tube is used for controlling the current signal amplification of the first inverting input end according to the output signal of the signal output end;
the first non-inverting input end of the first operational amplifier is connected to a first reference power supply, the first power supply input end of the first operational amplifier is connected to a first auxiliary power supply, and the first operational amplifier output end of the first operational amplifier is connected to the back-end circuit;
the first resistor is connected between the first operational amplifier output end and the first inverting input end of the first operational amplifier in parallel;
the first operational amplifier and the first resistor are used for amplifying and converting the current signal of the first inverting input end into voltage.
2. The signal processing circuit of claim 1, wherein a first capacitor is connected in parallel between the operational amplifier output terminal and the first inverting input terminal of the first operational amplifier.
3. The signal processing circuit of claim 1, wherein the receiving module comprises an optical receiver and a second resistor, one end of the optical receiver is connected to a second auxiliary power supply, the other end of the optical receiver is a signal output end of the receiving module and is connected to the first controlled end of the first switch tube, and the second resistor is connected in parallel to two ends of the optical receiver.
4. The signal processing circuit of claim 3, wherein the light receiver is a photodiode, a cathode of the photodiode is connected to the second auxiliary power supply, and an anode of the photodiode is connected to the first controlled terminal of the first switch tube.
5. The signal processing circuit of claim 1, wherein the first switch tube is a first transistor, a collector of the first transistor is a first current input terminal of the first switch tube, an emitter of the first transistor is a first current output terminal of the first switch tube, and a base of the first transistor is a first controlled terminal of the first switch tube.
6. The signal processing circuit of claim 1, further comprising a secondary amplification circuit, wherein the secondary amplification circuit comprises a second switch tube, a second operational amplifier and a third resistor;
the second switch tube is provided with a second current input end, a second current output end and a second controlled end;
the second operational amplifier is provided with a second in-phase input end, a second inverted input end, a second power supply input end and a second operational amplifier output end;
a second current input end of the first switching tube is connected to a second inverting input end of the second operational amplifier, a second current output end of the first switching tube is grounded, and a second controlled end of the first switching tube is connected to a first operational amplifier output end of the first operational amplifier;
a second non-inverting input end of the second operational amplifier is connected to a second reference power supply, a second power supply input end of the second operational amplifier is connected to a third auxiliary power supply, and a second operational amplifier output end of the second operational amplifier is connected to the processor;
the third resistor is connected in parallel between the second inverting input end of the second operational amplifier and the second operational amplifier output end.
7. The signal processing circuit of claim 6, wherein the second stage amplification circuit further comprises a second capacitor connected in parallel between the second inverting input of the second operational amplifier and the second operational amplifier output.
8. The signal processing circuit of claim 6, wherein the second switch tube is a second transistor, a collector of the second transistor is a second current input terminal of the second switch tube, an emitter of the second transistor is a second current output terminal of the second switch tube, and a base of the second transistor is a second controlled terminal of the second switch tube.
9. An infrared receiving module comprising the signal processing circuit and the processor according to any one of claims 1 to 8; and the amplified signal output end of the signal processing circuit is electrically connected with the input end of the processor.
10. An electronic device characterized by comprising the infrared receiving module and the infrared transmitting module of claim 9.
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| CN202123086572.0U CN217213671U (en) | 2021-12-08 | 2021-12-08 | Signal processing circuit, infrared receiving module and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116719438A (en) * | 2022-09-13 | 2023-09-08 | 广州众远智慧科技有限公司 | Infrared touch device and electronic device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116719438A (en) * | 2022-09-13 | 2023-09-08 | 广州众远智慧科技有限公司 | Infrared touch device and electronic device |
| CN116719438B (en) * | 2022-09-13 | 2024-06-11 | 广州众远智慧科技有限公司 | Infrared touch device and electronic device |
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