CN211405989U - Non-coherent demodulation circuit of sine wave signal - Google Patents
Non-coherent demodulation circuit of sine wave signal Download PDFInfo
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- CN211405989U CN211405989U CN202020397041.XU CN202020397041U CN211405989U CN 211405989 U CN211405989 U CN 211405989U CN 202020397041 U CN202020397041 U CN 202020397041U CN 211405989 U CN211405989 U CN 211405989U
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Abstract
The utility model discloses a sine wave signal's incoherent demodulation circuit, it includes: the operational amplifier comprises an operational amplifier module, a filter module, a rectifier module, an operational amplifier integration module and an envelope detection module which are sequentially connected. The envelope detection module comprises: the PWM input end, the resistor R33, the MOS tube Q5 and the signal output end CAPIUER. The source of the MOS transistor Q5 is connected to the operational amplifier integration module, the gate of the MOS transistor Q5 is connected to the resistor R33, the resistor R33 is connected to the PWM input terminal, and the drain of the MOS transistor Q5 is connected to the signal output terminal capacier. The circuit connection structure of the utility model is simple and easy to realize; the filter circuit adopts an active filter mode, is easy to debug and has good noise resistance; the utility model discloses an envelope detection mode need not resume coherent carrier, and the break-make of MOS pipe is controlled by the input square wave, and this makes the passive pen feedback signal's that square wave time sequence control demodulation came out chronogenesis, and then makes the sampling accurate.
Description
Technical Field
The utility model relates to an electromagnetism digital panel technical field, in particular to sine wave signal's incoherent demodulation circuit.
Background
Electromagnetic digitizer systems are typically constructed of three parts, a digitizer with a PCB coil, a passive pen with an induction coil (also called an electromagnetic pen), and an imaging device with a USB cable. The imaging device can draw images, and when the digital board is in a working state, the passive pen-end resonance signal and the digital board-end carrier signal are superposed and then received by the signal feedback receiving unit and processed into digital signals which can be identified and processed by the MCU. The most critical step is that the signal feedback unit receives the superposed signal and processes and demodulates the superposed signal to obtain a passive pen feedback signal and performs digital-to-analog conversion, and the demodulation process of the signal is indispensable.
Demodulation of a signal is divided into coherent demodulation and noncoherent demodulation. Coherent demodulation, also called synchronous detection, requires a complex circuit and requires synchronous demodulation of the signals. While demodulating the passive pen feedback signal, if implemented in a complex circuit, the interference between the circuit elements itself becomes significant and the cost will increase significantly. Therefore, the non-coherent demodulation method, also called envelope detection, is adopted, so that not only can the circuit be simplified, but also the cost can be reduced. Typically, a diode is selected as the non-linear device in the envelope detector. However, the diode envelope detection is easily limited by the diode, and has the defects of low detection efficiency and inaccurate sampling.
Therefore, how to design a non-coherent demodulation circuit for sine wave signals to make signal sampling accurate is an urgent technical problem to be solved in the industry.
SUMMERY OF THE UTILITY MODEL
In order to solve the unsafe defect of current sampling, the utility model provides a sine wave signal's incoherent demodulation circuit, this circuit make the level rising edge that the demodulation came out not appear time delay phenomenon through accurate control MOS pipe break-make to reach the accurate purpose of signal sampling.
The utility model provides a sine wave signal's incoherent demodulation circuit, include: the operational amplifier comprises an operational amplification module, a filtering module, a rectifying module, an operational amplifier integration module and an envelope detection module. The operational amplification module is connected with the filtering module, the filtering module is connected with the rectifying module, the rectifying module is connected with the operational amplifier integration module, and the operational amplifier integration module is connected with the envelope detection module. The envelope detection module comprises: the PWM input end, the resistor R33, the MOS tube Q5 and the signal output end CAPIUER. The source of the MOS transistor Q5 is connected to the operational amplifier integration module, the gate of the MOS transistor Q5 is connected to the resistor R33, the resistor R33 is connected to the PWM input terminal, and the drain of the MOS transistor Q5 is connected to the signal output terminal capacier.
In an embodiment of the present invention, the operational amplification module adopts an in-phase operational amplifier, which includes: operational amplifier U4, resistor R15 and R25. One end of the resistor R25 is connected with the input of a signal, and the other end of the resistor R25 is connected with the negative input end of the first operational amplifier in the operational amplifier U4 and one end of the resistor R15; the other end of the resistor R15 is connected with the output end of the first operational amplifier in the operational amplifier U4 and the input end of the filter module.
In an embodiment of the present invention, the filtering module includes: a low pass filter and a high pass filter. The low-pass filter adopts a second-order active low-pass filter, and comprises: a resistor M, a resistor R, a capacitor N, a capacitor C and an operational amplifier U4. One end of the resistor M is connected with the output end of the operational amplification module, and the other end of the resistor M is connected with the resistor R and the capacitor N; the other end of the resistor R is connected with one end of the capacitor C and the positive electrode input end of a second operational amplifier in the operational amplifier U4; the other end of the capacitor C is grounded; and the other end of the capacitor N is connected with the input end of the high-pass filter. The high-pass filter adopts two high-pass filters which are sequentially connected and the same, and comprises: a first high pass filter and a second high pass filter. The first high pass filter includes: the circuit comprises a resistor R1, a resistor R2, a capacitor C2, a capacitor C3 and an operational amplifier U5. One end of the capacitor C2 is connected with the output end of the second-order active low-pass filter, and the other end is connected with one end of the resistor R1 and one end of the capacitor C3; the other end of the capacitor C3 is connected with one end of the resistor R2 and the positive electrode input end of a first operational amplifier in the operational amplifier U5; the other end of the resistor R2 is grounded; the other end of the resistor R1 is connected with the output end of the first operational amplifier in the operational amplifier U5 and the input end of the second high-pass filter. The second high pass filter includes: the filter comprises a resistor R35, a resistor R44, a capacitor C30, a capacitor C31 and an operational amplifier U5, wherein one end of the capacitor C31 is connected with the output end of the second-order active low-pass filter, and the other end of the capacitor C31 is connected with the other end of the resistor R35 and one end of the capacitor C30; the other end of the capacitor C30 is connected with one end of a resistor R44 and the positive electrode input end of a second operational amplifier in the operational amplifier U5; the other end of the resistor R44 is grounded; the other end of the resistor R35 is connected with the output end of the second operational amplifier in the operational amplifier U5 and the input end of the rectifying module.
In an embodiment of the present invention, the rectification module adopts a half-wave rectifier, which includes: diode D2, diode D3, and operational amplifier U7. The anode of the diode D2 is connected to the cathode of the diode D3 and the output end of the first operational amplifier in the operational amplifier U7, the cathode of the diode D2 is connected to the cathode input end of the first operational amplifier in the operational amplifier U7 and the output end of the filtering module, and the anode of the diode D3 is connected to the input end of the operational amplifier integrating module.
In an embodiment of the utility model, the operation amplifier integration module includes: a resistor R38, a resistor R45, a capacitor C29 and the operational amplifier U7. The two ends of the resistor R45 are respectively connected with the positive input end of the second operational amplifier in the operational amplifier U7 and the ground, one end of the resistor R38 is connected with the rectifying module, the other end of the resistor R38 is connected with the negative input end of the second operational amplifier in the operational amplifier U7 and the capacitor C29, and the other end of the capacitor C29 is connected with the output end of the second operational amplifier in the operational amplifier U7 and the envelope detection module.
Compared with the prior art, the circuit connection structure of the utility model is simple and easy to realize; the filter circuit adopts an active filter mode, is easy to debug and has good noise resistance; the utility model discloses a coherent carrier wave need not be resumeed to the mode of envelope detection to the break-make of MOS pipe is controlled by the input square wave, and this makes the passive pen feedback signal's that square wave time sequence control demodulation comes out the chronogenesis, and then makes the sampling accurate.
Drawings
The invention is explained in more detail below with reference to exemplary embodiments and the accompanying drawings, in which:
FIG. 1 is a block diagram of a non-coherent demodulation architecture;
FIG. 2 is a circuit diagram of an in-phase operational amplifier and a second order low pass filter;
FIG. 3 is a schematic diagram of two second order high pass filter circuits;
fig. 4 is a schematic diagram of a half-wave rectification, operational amplifier integration and envelope detection circuit.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherein like or similar reference numbers indicate like or similar elements or have like or similar elements; those skilled in the art will readily appreciate that specific embodiments are not described herein with respect to conventional operations in circuits, such as protection circuits. The embodiments described below with reference to the drawings are illustrative only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
As shown in fig. 1, a sine wave signal incoherent demodulation circuit according to an embodiment of the present invention includes: operational amplification module, filtering module, rectifier module, operational amplifier integral module, envelope detection module, wherein: the operational amplification module is connected with the filtering module, the filtering module is connected with the rectifying module, the rectifying module is connected with the operational amplifier integration module, and the operational amplifier integration module is connected with the envelope detection module.
The utility model discloses operational amplification module adopts homophase operational amplifier, as shown in fig. 2, it includes: operational amplifier U4, resistor R15 and R25. One end of the resistor R25 is connected with the input of a signal, and the other end of the resistor R25 is connected with the negative input end of the first operational amplifier in the operational amplifier U4 and one end of the resistor R15; the other end of the resistor R15 is connected with the output end of the first operational amplifier in the operational amplifier U4 and the input end of the filter module. Preferably, the amplifier is of the type MC4580 and internally comprises two independent operational amplifiers, wherein the amplification gain of the in-phase operational amplifier is Avf =1+ R15/R25.
The utility model discloses filtering module includes: a low pass filter and a high pass filter.
As shown in fig. 2, the low pass filter is a second-order active low pass filter including: the operational amplifier comprises a resistor M, a resistor R, a capacitor N, a capacitor C and an operational amplifier U4, wherein one end of the resistor M is connected with the output end of the operational amplification module, and the other end of the resistor M is connected with the resistor R and the capacitor N; the other end of the resistor R is connected with one end of the capacitor C and the positive electrode input end of a second operational amplifier in the operational amplifier U4; the other end of the capacitor C is grounded; and the other end of the capacitor N is connected with the input end of the high-pass filter. In general, the second-order active low-pass filter has a cut-off frequency of
。
As shown in fig. 3, the high-pass filter adopts two high-pass filters which are connected in sequence and the same, and comprises: a first high pass filter and a second high pass filter. The first high-pass filter includes: the circuit comprises a resistor R1, a resistor R2, a capacitor C2, a capacitor C3 and an operational amplifier U5. One end of the capacitor C2 is connected with the output end of the second-order active low-pass filter, and the other end of the capacitor C2 is connected with one end of the resistor R1 and one end of the capacitor C3; the other end of the capacitor C3 is connected with one end of the resistor R2 and the positive electrode input end of the first operational amplifier in the operational amplifier U5; the other end of the resistor R2 is grounded; the other end of the resistor R1 is connected with the output end of the first operational amplifier in the operational amplifier U5 and the input end of the second high-pass filter. The second high pass filter includes: the circuit comprises a resistor R35, a resistor R44, a capacitor C30, a capacitor C31 and an operational amplifier U5. One end of the capacitor C31 is connected with the output end of the second-order active low-pass filter, and the other end of the capacitor C31 is connected with the other end of the resistor R35 and one end of the capacitor C30; the other end of the capacitor C30 is connected with one end of the resistor R44 and the positive electrode input end of a second operational amplifier in the operational amplifier U5; the other end of the resistor R44 is grounded; the other end of the resistor R35 is connected with the output end of the second operational amplifier in the operational amplifier U5 and the input end of the rectifying module. In general, the cut-off frequencies of the first high-pass filter and the second high-pass filter are:
the utility model discloses rectifier module adopts the half-wave rectifier, as shown in FIG. 4, it includes: diode D2, diode D3, and operational amplifier U7. The anode of the diode D2 is connected to the cathode of the diode D3 and the output end of the first operational amplifier in the operational amplifier U7, the cathode of the diode D2 is connected to the cathode input end of the first operational amplifier in the operational amplifier U7 and the output end of the filter module, and the anode of the diode D3 is connected to the input end of the operational amplifier integrating module.
As shown in fig. 4, the operational amplifier integrating module of the embodiment of the present invention comprises: a resistor R38, a resistor R45, a capacitor C29 and an operational amplifier U7. The two ends of the resistor R45 are respectively connected with the anode input end and the ground of the second operational amplifier in the operational amplifier U7, one end of the resistor R38 is connected with the half-wave rectification module, the other end of the resistor R38 is connected with the cathode input end of the second operational amplifier in the operational amplifier U7 and the capacitor C29, and the other end of the capacitor C29 is connected with the output end of the second operational amplifier in the operational amplifier U7 and the envelope detection module. Generally, the integral value of the operational amplifier integrator is- (V/R38 × C29) × T, where V is the signal of the half period portion of the sine wave, and T is the low level time of the envelope signal.
As shown in fig. 4, the envelope detection module according to the embodiment of the present invention includes: the PWM input end, the resistor R33, the MOS tube Q5 and the signal output end CAPIUER. The source electrode of the MOS transistor Q5 is connected with the operational amplifier integration module, the gate electrode of the MOS transistor Q5 is connected with the resistor R33, the resistor R33 is connected with the PWM input end, and the drain electrode of the MOS transistor Q5 is connected with the signal output end CAPIUER.
In specific implementation, the utility model provides a sine wave signal incoherent demodulation mode includes:
the method comprises the following steps: and amplifying the sine wave signal fed back by the active pen, wherein the sine wave signal is amplified by an in-phase operational amplifier.
Step two: and low-pass filtering, namely filtering the frequency band signal with the cut-off frequency higher than the cut-off frequency of the second-order active low-pass filter by the signal amplified by the in-phase operational amplifier through the second-order active low-pass filter.
Step three: and high-pass filtering, namely filtering the frequency band signal which is lower than the cut-off frequency of the second-order active high-pass filter by the signal processed by the second-order active low-pass filter through the second-order active high-pass filter. Because the influence of low-frequency-band noise is more obvious, high-pass filtering is carried out twice for better filtering effect.
The first step, the second step and the third step are to find the effective passband of the passive pen feedback signal, so as to further process the effective passband to obtain the required signal form.
Step four: and half-wave rectification, wherein the signal processed by the second-order active high-pass filter filters the positive half-cycle signal of the passive pen feedback signal through a half-wave rectifier, and outputs a negative half-cycle signal of a sine wave, and the negative half-cycle signal is changed into a phase inversion output.
Step five: and integrating the operational amplifier, wherein the signal processed by the half-wave rectifier is subjected to integral operation on the negative half-cycle signal of the sine wave through the operational amplifier integrator, so that a required signal form is obtained, and the signal form is an amplitude limiting signal which is 90 degrees different from the negative half-cycle signal output by phase inversion in the fourth step.
The purpose of the above step four and step five is to obtain the required signal form, so as to further process the signal to demodulate the signal fed back by the passive pen.
Step six: envelope detection, the signal processed by the operational amplifier integrator demodulates the passive pen feedback signal of the envelope signal in a low level time period through an envelope detection module, wherein a square wave with a fixed duty ratio is input to a PWM input end to control the conduction and the disconnection of an MOS (metal oxide semiconductor) tube in the envelope detection module so as to achieve the purpose that the rising edge of the output signal of the integrator does not have a time delay phenomenon. Finally, the demodulated signal becomes the original passive pen feedback signal and is transmitted to the AD port of the singlechip through the output end CAPIUER to complete the whole incoherent demodulation process. Finally, the time sequence of the modulated passive pen feedback signal is consistent with the time sequence of the square wave with the fixed duty ratio, a signal represents low level, and no signal represents high level, so that the sampling data becomes accurate.
In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "connected to", "connected to" and "including" are to be construed broadly, and those skilled in the art can understand the specific meaning of the terms according to specific situations.
In this specification, a schematic representation of the term does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention have been shown, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A non-coherent demodulation circuit of a sine wave signal, comprising: operational amplification module, filtering module, rectifier module, fortune that link to each other in proper order are put integral module and envelope detection module, its characterized in that, envelope detection module, it includes:
the amplifier comprises a PWM input end, a resistor R33, a MOS tube Q5 and a signal output end CAPIUER, wherein the source electrode of the MOS tube Q5 is connected with the operational amplifier integration module, the grid electrode of the MOS tube Q5 is connected with the resistor R33, the resistor R33 is connected with the PWM input end, and the drain electrode of the MOS tube Q5 is connected with the signal output end CAPIUER.
2. The non-coherent demodulation circuit for sine wave signals according to claim 1, wherein said operational amplification module employs an in-phase operational amplifier, comprising:
the operational amplifier U4, and the resistors R15 and R25, wherein one end of the resistor R25 is connected with the input of a signal, and the other end is connected with the negative input end of the first operational amplifier in the operational amplifier U4 and one end of the resistor R15; the other end of the resistor R15 is connected with the output end of the first operational amplifier in the operational amplifier U4 and the input end of the filter module.
3. The non-coherent demodulation circuit for sine wave signals according to claim 1, wherein said filtering module comprises: a low pass filter and a high pass filter.
4. A sine wave signal non-coherent demodulation circuit according to claim 3, wherein said low pass filter is a second order active low pass filter comprising:
the operational amplifier comprises a resistor M, a resistor R, a capacitor N, a capacitor C and an operational amplifier U4, wherein one end of the resistor M is connected with the output end of the operational amplification module, and the other end of the resistor M is connected with the resistor R and the capacitor N; the other end of the resistor R is connected with one end of the capacitor C and the positive electrode input end of a second operational amplifier in the operational amplifier U4; the other end of the capacitor C is grounded; and the other end of the capacitor N is connected with the input end of the high-pass filter.
5. A sine wave signal non-coherent demodulation circuit according to claim 3 wherein said high pass filter employs two identical high pass filters connected in series, comprising: a first high pass filter and a second high pass filter.
6. The circuit for noncoherent demodulation of a sine wave signal according to claim 5, wherein said first and second high pass filters are second order active high pass filters, wherein said first high pass filter comprises:
the filter comprises a resistor R1, a resistor R2, a capacitor C2, a capacitor C3 and an operational amplifier U5, wherein one end of the capacitor C2 is connected with the output end of the second-order active low-pass filter, and the other end of the capacitor C2 is connected with one end of the resistor R1 and one end of the capacitor C3; the other end of the capacitor C3 is connected with one end of the resistor R2 and the positive electrode input end of a first operational amplifier in the operational amplifier U5; the other end of the resistor R2 is grounded; the other end of the resistor R1 is connected with the output end of a first operational amplifier in the operational amplifier U5 and the input end of the second high-pass filter;
the second high pass filter includes:
the filter comprises a resistor R35, a resistor R44, a capacitor C30, a capacitor C31 and an operational amplifier U5, wherein one end of the capacitor C31 is connected with the output end of the second-order active low-pass filter, and the other end of the capacitor C31 is connected with the other end of the resistor R35 and one end of the capacitor C30; the other end of the capacitor C30 is connected with one end of a resistor R44 and the positive electrode input end of a second operational amplifier in the operational amplifier U5; the other end of the resistor R44 is grounded; the other end of the resistor R35 is connected with the output end of the second operational amplifier in the operational amplifier U5 and the input end of the rectifying module.
7. The non-coherent demodulation circuit for sine wave signals according to claim 1, wherein said rectification module employs a half-wave rectifier comprising:
the operational amplifier circuit comprises a diode D2, a diode D3 and an operational amplifier U7, wherein the anode of the diode D2 is connected with the cathode of the diode D3 and the output end of a first operational amplifier in the operational amplifier U7, the cathode of the diode D2 is connected with the cathode input end of the first operational amplifier in the operational amplifier U7 and the output end of the filter module, and the anode of the diode D3 is connected with the input end of the operational amplifier integration module.
8. The non-coherent demodulation circuit for sine wave signals according to claim 1, wherein said op-amp integration module comprises:
the rectifier comprises a resistor R38, a resistor R45, a capacitor C29 and an operational amplifier U7, wherein two ends of the resistor R45 are respectively connected with the positive electrode input end of a second operational amplifier in the operational amplifier U7 and the ground, one end of the resistor R38 is connected with the rectifier module, the other end of the resistor R38 is connected with the negative electrode input end of the second operational amplifier in the operational amplifier U7 and the capacitor C29, and the other end of the capacitor C29 is connected with the output end of the second operational amplifier in the operational amplifier U7 and the envelope detection module.
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| CN202020397041.XU CN211405989U (en) | 2020-03-25 | 2020-03-25 | Non-coherent demodulation circuit of sine wave signal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532197A (en) * | 2020-11-17 | 2021-03-19 | 北京中电华大电子设计有限责任公司 | Envelope restoration circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532197A (en) * | 2020-11-17 | 2021-03-19 | 北京中电华大电子设计有限责任公司 | Envelope restoration circuit |
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