CN111708463A - Mixed signal processing device - Google Patents
Mixed signal processing device Download PDFInfo
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- CN111708463A CN111708463A CN202010603535.3A CN202010603535A CN111708463A CN 111708463 A CN111708463 A CN 111708463A CN 202010603535 A CN202010603535 A CN 202010603535A CN 111708463 A CN111708463 A CN 111708463A
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- signal
- signal processing
- processing module
- circuit
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
Abstract
The application discloses mixed signal processing apparatus includes: a signal processing module; the signal processing module comprises a current compensation circuit, a transimpedance amplification circuit, a differential amplification circuit and an analog switch circuit which are sequentially connected; the current compensation circuit is used for eliminating a direct current signal in the current signal; the transimpedance amplification circuit is used for converting the current signal into a voltage signal, amplifying the voltage signal and filtering a high-frequency signal in the voltage signal; the differential amplification circuit is used for amplifying the voltage signal to a range which can be identified by the analog-to-digital converter; the analog switch circuit is used for controlling the signal processing module to be switched on and switched off, and the signal processing module outputs signals to the outside through the analog switch circuit. The signal processing module solves the technical problems that an existing signal processing module cannot identify weak signals, the signal to noise ratio is low, and mutual interference is easily caused by multi-stage amplification and multi-path signals.
Description
Technical Field
The present application relates to the field of signal processing circuits, and in particular, to a mixed signal processing apparatus.
Background
The main working principle of the infrared touch screen is that an infrared transmitting tube is respectively arranged on one side of a front frame of the screen in the Y-axis direction and one side of the front frame in the X-axis direction, corresponding photosensitive tubes are respectively arranged on the opposite sides of the infrared transmitting tube and the photosensitive tubes, and the infrared transmitting tubes and the photosensitive tubes form a crisscross infrared matrix in front of the screen. The switch of the infrared transmitting tube, the triode and the operational amplifier are controlled by the logic control chip to amplify signals of the photosensitive tube. The photosensitive tube receives infrared rays, converts optical signals into electric signals through photoelectric conversion, amplifies the signals, converts the signals into digital signals through A/D conversion and then is recognized by the MCU; when a user touches a touch point with a finger, infrared rays passing through the point in the X-axis direction and the Y-axis direction can be blocked, the MCU can identify the infrared rays and calculate the coordinate output of the touch object according to the relative position of the missing light.
The existing signal processing scheme comprises a power supply module, an infrared transmitting tube control module and a signal processing module. The power module includes an LDO (Low Dropout Regulator) or a DC-DC converter, wherein a single device has a large size and a large number, so that the occupied PCB area is large. The infrared emission control module builds an infrared emission tube control circuit through logic chips such as a shift register and a 3-8 decoder, so that on-off control of the infrared emission tube is achieved, a single device is large in size and large in quantity, connecting wires are large, occupied PCB area is large, and cost is high. In addition, the signal processing module amplifies current signals by the triode and the operational amplifier, and because the noise of the triode can be increased along with the increase of temperature and the increase of current, weak signals cannot be identified, the signal-to-noise ratio is low, and mutual interference is easily caused by multi-stage amplification and multi-path signals.
Disclosure of Invention
The embodiment of the application provides a mixed signal processing device, which solves the technical problems that the existing signal processing module cannot identify weak signals, the signal-to-noise ratio is low, and mutual interference is easily caused by multi-stage amplification and multi-path signals.
In view of the above, a first aspect of the present application provides a mixed signal processing apparatus, including:
the signal processing module comprises a current compensation circuit, a transimpedance amplification circuit, a differential amplification circuit and an analog switch circuit which are sequentially connected;
the current compensation circuit is used for eliminating a direct current signal in a current signal;
the transimpedance amplifying circuit is used for converting the current signal into a voltage signal, amplifying the voltage signal and filtering a high-frequency signal in the voltage signal;
the differential amplifying circuit is used for amplifying the voltage signal to a range recognizable by the analog-to-digital converter;
the analog switch circuit is used for controlling the signal processing module to be switched on and switched off, and the signal processing module outputs signals to the outside through the analog switch circuit.
Optionally, the system further comprises a power supply module;
the power supply module comprises a first power supply conversion unit and a second power supply conversion unit which are sequentially connected;
the first conversion unit is used for converting an external power supply voltage into a power supply voltage supplied to the signal processing module;
the second power conversion unit is used for converting the power supply voltage into a bias voltage supplied to the signal processing module.
Optionally, the infrared emission tube driving module is further included;
the infrared transmitting tube driving module comprises a logic unit;
the logic unit comprises a clock signal terminal CLK, a signal input terminal DIN and a plurality of signal output terminals OUT1 to OUTN;
and triggering one displacement every rising edge of the CLK, so that the signal output end corresponding to the DIN is sequentially displaced from OUT1 to OUTN.
Optionally, the current compensation circuit includes a current compensation unit and a first amplifier;
the current signals are respectively input to the inverting input end of the first amplifier and the current compensation unit;
and a resistor is connected in parallel between the reverse input end and the output end of the first amplifier, and the forward input end is grounded.
Optionally, the transimpedance amplification circuit includes a second amplifier;
and a resistor and a capacitor are respectively connected in parallel between the reverse input end and the output end of the second amplifier, so that the current signal is converted into a voltage signal through the resistor, and the high-frequency noise is filtered through the capacitor.
Optionally, the differential amplifying circuit includes a third amplifier;
the positive input end of the third amplifier is grounded;
the reverse input end of the third amplifier is connected with a resistor, and the other end of the resistor is connected with the output end of the transimpedance amplification circuit;
and a resistor is connected in parallel between the inverting input end and the output end of the third amplifier.
According to the technical scheme, the method has the following advantages:
the application provides a mixed signal processing device, a signal processing module; the signal processing module comprises a current compensation circuit, a transimpedance amplification circuit, a differential amplification circuit and an analog switch circuit which are sequentially connected; the current compensation circuit is used for eliminating a direct current signal in the current signal; the transimpedance amplification circuit is used for converting the current signal into a voltage signal, amplifying the voltage signal and filtering a high-frequency signal in the voltage signal; the differential amplification circuit is used for amplifying the voltage signal to a range which can be identified by the analog-to-digital converter; the analog switch circuit is used for controlling the signal processing module to be switched on and switched off, and the signal processing module outputs signals to the outside through the analog switch circuit.
The direct current signal input to the signal processing module is eliminated through the current compensation circuit, namely, the light interference in the environment can be effectively eliminated (a high-pass filter is adopted in the prior art, and the normal working signal is attenuated while the ambient light is filtered); the input signal is converted into a voltage signal through the transimpedance amplification circuit, so that the signal-to-noise ratio can be improved, high-frequency noise can be filtered, and the accuracy of signal identification can be realized; amplifying the signal to a range which can be recognized by an analog-digital converter through a differential amplification circuit; the output of the signal is controlled by an analog switch circuit.
Drawings
Fig. 1 is a schematic structural diagram of a signal processing module in an embodiment of a mixed signal processing apparatus according to the present application;
FIG. 2 is a circuit diagram of a signal processing module according to the prior art;
fig. 3 is a schematic structural diagram of a power module according to an embodiment of a mixed signal processing apparatus of the present application;
FIG. 4 is a schematic diagram of an IR emitter driver module according to an embodiment of the present application;
FIG. 5 is a circuit diagram of a current compensation circuit according to an embodiment of a mixed signal processing apparatus of the present application;
fig. 6 is a circuit diagram of a transimpedance amplifier circuit according to an embodiment of a mixed signal processing apparatus of the present application;
fig. 7 is a circuit diagram of a differential amplifier circuit according to an embodiment of a mixed signal processing apparatus of the present application.
Detailed Description
In the prior art, a signal processing scheme in the prior art includes a power module, an infrared transmitting tube control module and a signal processing module. The power module includes an LDO (Low Dropout Regulator) or a DC-DC converter, and a single device thereof has a large size and a large number, so that an occupied PCB area is large. The infrared emission control module builds an infrared emission tube control circuit through logic chips such as a shift register and a 3-8 decoder, so that on-off control of the infrared emission tube is achieved, a single device is large in size and large in quantity, connecting wires are large, occupied PCB area is large, and cost is high. The signal processing module amplifies current signals by the triode and the operational amplifier, and because the noise of the triode can be increased along with the increase of temperature and the increase of current, weak signals cannot be identified, the signal-to-noise ratio is low, and because the multi-stage amplification and multi-path signals are easy to cause mutual interference, the circuit diagram of the signal processing module is shown in fig. 2.
The signal processing module of the mixed signal processing device comprises a current compensation circuit, a transimpedance amplification circuit, a differential amplification circuit and an analog switch circuit which are sequentially connected; the direct current signal input to the signal processing module is eliminated through the current compensation circuit, namely, the light interference in the environment can be effectively eliminated (a high-pass filter is adopted in the prior art, and the normal working signal is attenuated while the ambient light is filtered); the input signal is converted into a voltage signal through the transimpedance amplification circuit, so that the signal-to-noise ratio can be improved, high-frequency noise can be filtered, and the accuracy of signal identification can be realized; amplifying the signal to a range which can be recognized by an analog-digital converter through a differential amplification circuit; the output of the signal is controlled by an analog switch circuit. Therefore, the weak signal is identified, the signal to noise ratio is improved, and the light interference in the environment can be effectively eliminated.
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
Fig. 1 is a schematic structural diagram of a signal processing module according to an embodiment of a mixed signal processing apparatus of the present application, as shown in fig. 1, the signal processing module in fig. 1 includes: the circuit comprises a current compensation circuit, a transimpedance amplification circuit, a differential amplification circuit and an analog switch circuit which are connected in sequence.
The current compensation circuit is used for eliminating a direct current signal in the current signal.
It should be noted that the current compensation circuit is used to eliminate the dc signal in the input signal, so that the dc signal generated by the optical interference is effectively filtered.
In a specific embodiment, the current compensation circuit comprises a current compensation unit and a first amplifier; the current signals are respectively input to the reverse input end of the first amplifier and the current compensation unit; a resistor is connected in parallel between the reverse input end and the output end of the first amplifier, and the forward input end of the first amplifier is grounded. In particular a current compensation circuit as shown in fig. 5.
The transimpedance amplification circuit is used for converting the current signal into a voltage signal, amplifying the voltage signal and filtering a high-frequency signal in the voltage signal.
It should be noted that the transimpedance amplification circuit converts an input current signal into a voltage signal, and can filter a high-frequency signal, so that the signal-to-noise ratio is improved, and the accuracy of signal identification is realized.
In a specific embodiment, the transimpedance amplification circuit includes a second amplifier; a resistor and a capacitor are respectively connected in parallel between the reverse input end and the output end of the second amplifier, so that a current signal is converted into a voltage signal through the resistor, and high-frequency noise is filtered through the capacitor; the positive input of the second amplifier is connected to ground. Specifically, the transimpedance amplifier circuit shown in fig. 6.
The differential amplifying circuit is used for amplifying the voltage signal to a range which can be identified by the analog-digital converter.
It should be noted that the differential amplification circuit can suppress the common-mode input signal and amplify the voltage signal at the same time, so that the final output signal of the signal processing module can reach the identification range of the analog-to-digital converter.
In a specific embodiment, the differential amplifying circuit includes a third amplifier; the positive input end of the third amplifier is grounded; the reverse input end of the third amplifier is connected with a resistor, and the other end of the resistor is connected with the output end of the transimpedance amplification circuit; a resistor is connected in parallel between the inverting input terminal and the output terminal of the third amplifier, specifically, a differential amplifier circuit as shown in fig. 7.
The analog switch circuit is used for controlling the signal processing module to be switched on and switched off, and the signal processing module outputs signals to the outside through the analog switch circuit.
It should be noted that, in the present application, the analog switch circuit is used to control the signal processing module to be turned on or off, and the signal processing module outputs a signal to the outside through the analog switch circuit; in addition, each chip can be independently controlled when a plurality of chips are connected in parallel by adopting the internal integrated analog switch, and the control is flexible.
The signal processing module of the mixed signal processing device comprises a current compensation circuit, a transimpedance amplification circuit, a differential amplification circuit and an analog switch circuit which are sequentially connected; the direct current signal input to the signal processing module is eliminated through the current compensation circuit, namely, the light interference in the environment can be effectively eliminated (a high-pass filter is adopted in the prior art, and the normal working signal is attenuated while the ambient light is filtered); the input signal is converted into a voltage signal through the transimpedance amplification circuit, so that the signal-to-noise ratio can be improved, high-frequency noise can be filtered, and the accuracy of signal identification can be realized; amplifying the signal to a range which can be recognized by an analog-digital converter through a differential amplification circuit; the output of the signal is controlled by an analog switch circuit. Therefore, the weak signal is identified, the signal to noise ratio is improved, and the light interference in the environment can be effectively eliminated.
In a specific implementation mode, the mixed signal processing device adopted by the application can integrate the power module, the infrared transmitting tube driving module and the signal processing module on one IC, so that the size and the connection of devices are reduced, a narrow-frame touch screen is realized, the internal wiring can be shortened through an integrated mode, and the mutual interference between signals and the interference of external digital signals are reduced.
The specific power supply module comprises a first power supply conversion unit and a second power supply conversion unit which are sequentially connected; the first conversion unit is used for converting the external power supply voltage into the power supply voltage supplied to the signal processing module; the second power conversion unit is used for converting the power supply voltage into a bias voltage supplied to the signal processing module, specifically, as shown in a circuit diagram of the power supply module shown in fig. 3.
The specific infrared transmitting tube driving module comprises a logic unit; the logic unit comprises a clock signal terminal CLK, a signal input terminal DIN and a plurality of signal output terminals OUT1 to OUTN; each rising edge of CLK triggers a shift, which causes DIN corresponding signal outputs to be shifted sequentially from OUT1 to OUTn. The application adopts a single-input and 12-output logic unit; each rising edge of CLK triggers a shift, DIN, to OUT 1; following each rising edge of CLK, DIN shifts back sequentially from OUT1 to OUT12, effecting a switch.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (6)
1. A mixed signal processing apparatus, comprising: a signal processing module;
the signal processing module comprises a current compensation circuit, a transimpedance amplification circuit, a differential amplification circuit and an analog switch circuit which are sequentially connected;
the current compensation circuit is used for eliminating a direct current signal in a current signal;
the transimpedance amplifying circuit is used for converting the current signal into a voltage signal, amplifying the voltage signal and filtering a high-frequency signal in the voltage signal;
the differential amplifying circuit is used for amplifying the voltage signal to a range recognizable by the analog-to-digital converter;
the analog switch circuit is used for controlling the signal processing module to be switched on and switched off, and the signal processing module outputs signals to the outside through the analog switch circuit.
2. The mixed signal processing device of claim 1, further comprising a power module;
the power supply module comprises a first power supply conversion unit and a second power supply conversion unit which are sequentially connected;
the first conversion unit is used for converting an external power supply voltage into a power supply voltage supplied to the signal processing module;
the second power conversion unit is used for converting the power supply voltage into a bias voltage supplied to the signal processing module.
3. The mixed signal processing device according to claim 1, further comprising an infrared emission tube driving module;
the infrared transmitting tube driving module comprises a logic unit;
the logic unit comprises a clock signal terminal CLK, a signal input terminal DIN and a plurality of signal output terminals OUT1 to OUTN;
and triggering one displacement every rising edge of the CLK, so that the signal output end corresponding to the DIN is sequentially displaced from OUT1 to OUTN.
4. The mixed signal processing device according to claim 1, wherein the current compensation circuit includes a current compensation unit and a first amplifier;
the current signals are respectively input to the inverting input end of the first amplifier and the current compensation unit;
and a resistor is connected in parallel between the reverse input end and the output end of the first amplifier, and the forward input end is grounded.
5. The mixed signal processing device according to claim 1, wherein the transimpedance amplification circuit includes a second amplifier;
and a resistor and a capacitor are respectively connected in parallel between the reverse input end and the output end of the second amplifier, so that the current signal is converted into a voltage signal through the resistor, and the high-frequency noise is filtered through the capacitor.
6. The mixed signal processing device according to claim 1, wherein the differential amplification circuit includes a third amplifier;
the positive input end of the third amplifier is grounded;
the reverse input end of the third amplifier is connected with a resistor, and the other end of the resistor is connected with the output end of the transimpedance amplification circuit;
and a resistor is connected in parallel between the inverting input end and the output end of the third amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010603535.3A CN111708463A (en) | 2020-06-29 | 2020-06-29 | Mixed signal processing device |
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| CN202010603535.3A CN111708463A (en) | 2020-06-29 | 2020-06-29 | Mixed signal processing device |
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| CN111708463A true CN111708463A (en) | 2020-09-25 |
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| CN202010603535.3A Pending CN111708463A (en) | 2020-06-29 | 2020-06-29 | Mixed signal processing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116094877A (en) * | 2023-04-11 | 2023-05-09 | 浙江地芯引力科技有限公司 | Differential signal transmission circuit and data transmission device |
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| CN109787566A (en) * | 2019-03-11 | 2019-05-21 | 广州华欣电子科技有限公司 | A kind of infrared signal amplifying circuit, processing circuit and infrared touch panel |
| CN210038751U (en) * | 2019-07-17 | 2020-02-07 | 广州华欣电子科技有限公司 | Infrared touch screen signal processing circuit |
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| CN1256758A (en) * | 1998-02-05 | 2000-06-14 | 住友金属工业株式会社 | Impedance-to-voltage converter and converting method |
| US20130005286A1 (en) * | 2006-06-14 | 2013-01-03 | Research In Motion Limited | Input drive control for switcher regulated power amplifier modules |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116094877A (en) * | 2023-04-11 | 2023-05-09 | 浙江地芯引力科技有限公司 | Differential signal transmission circuit and data transmission device |
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