CN114306927A - Intermediate frequency electric wave modulation circuit and modulation method - Google Patents
Intermediate frequency electric wave modulation circuit and modulation method Download PDFInfo
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Abstract
The invention provides an intermediate frequency electric wave modulation circuit and a modulation method, and relates to the field of intermediate frequency electric waves. The medium-frequency radio wave modulation circuit comprises a D/A converter, an inverter and a selector, wherein a REF port of the D/A converter is connected with a first reference voltage VREF1, the D/A converter takes the first reference voltage as a reference, a DAC port of the D/A converter is simultaneously connected with a 1 IN-port of the inverter and an NO port of the selector, a 1OUT port of the inverter is connected with an NC port of the selector, the NO port of the selector is used for analog signal selection, a SELECT port of the selector is connected with a carrier frequency, and the COM port of the selector outputs a generated analog signal. In the invention, the same waveform is divided into two paths by the DAC port of the D/A converter for output, wherein one path outputs the original waveform without processing, the other path reverses the waveform through the reverser, and the output waveform of the D/A converter is reversed through the reverser, thereby reducing the performance consumption of the D/A converter.
Description
Technical Field
The invention relates to the field of intermediate frequency electric waves, in particular to an intermediate frequency electric wave modulation circuit and a modulation method.
Background
Intermediate frequency electrotherapy is a method for treating diseases by adopting intermediate frequency pulse current with working frequency of 1KHz-100KHz, wherein the intermediate frequency electrotherapy process needs to modulate intermediate frequency electric waves, specific waveforms are generated after the intermediate frequency electric waves are modulated, different waveforms and frequencies alternately appear, the adaptability of a body to current can be overcome, and the modulation depth of the output waveforms can be changed, so that the stimulation intensity is changed; the intermediate frequency treatment has the effects of easing pain of the organism, promoting local blood circulation, regulating nerve reflex, stimulating skeletal muscle contraction and the like.
Through retrieval, the application number is CN201610005434.X, the modulation circuit of the prescription waveform for the treatment of the medium and low frequency therapeutic apparatus in the patent specification comprises a modulation waveform generation circuit, an impedance transformation circuit, a drive amplification circuit, a boost modulation circuit and a waveform output circuit; wherein, the modulation waveform generating circuit … … "and patent specification", the modulation method of the therapeutic prescription waveform of medium and low frequency therapeutic apparatus, including the following steps: the first step is as follows: modulation of the generation of intermediate frequency waves. The second step is that: and (4) output waveform impedance transformation. The third step: and amplifying the output power of the modulation waveform. The fourth step: and (5) boosting and modulating. The fifth step: and outputting the prescription waveform. By adopting the technical scheme, different low-frequency prescription waveform profiles can be effectively boosted and modulated into an intermediate-frequency prescription waveform so as to meet the requirements of different patients. Through the impedance conversion circuit, under the condition of keeping the peak-to-peak value of the voltage unchanged, the load capacity of the medium-frequency modulation wave band is greatly improved; a driving amplifying circuit is arranged, the output power of the intermediate frequency modulation wave is further increased, and impedance conversion is carried out; and the filter circuit is used for improving the quality of square waves at the intermediate frequency output position. This patent sets up filter circuit, drive amplifier circuit and impedance conversion circuit and is the circuit commonly used, and this patent mainly realizes the low frequency modulation intermediate frequency that steps up to the mode modulation different wave forms of modulation that steps up, in order to satisfy patient's needs, but leads to wave form modulation process DA converting circuit performance consumption to improve, and the while is accurate for realizing switching the wave form fast, needs occupy DA converter resource, leads to DA converter performance consumption further to improve.
The intermediate frequency radio wave modulation circuit and the modulation method are provided according to the defects.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an intermediate frequency electric wave modulation circuit and a modulation method, and solves the problems that the performance consumption of a DA conversion circuit is improved and the waveform can not be accurately and quickly switched in the waveform modulation process.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: an intermediate frequency radio wave modulation circuit comprises a D/A converter, an inverter and a selector, wherein a REF port of the D/A converter is connected with a first reference voltage VREF1, the D/A converter converts an input digital signal and outputs an analog signal by taking the first reference voltage as a reference, a DAC port of the D/A converter is simultaneously connected with a 1 IN-port of the inverter and an NO port of the selector, a 1OUT port of the inverter is connected with an NC port of the selector, the NO port of the selector is used for selecting the analog signal, the phase of the analog signal is inverted by 180 degrees by the inverter, a SELECT port of the selector is connected with a carrier frequency, and a COM port of the selector outputs the generated analog signal.
Preferably, the LDAC port of the D/A converter is grounded;
a direct current power supply DC1 is connected to the VDD port of the D/A converter, a capacitor C36 and a capacitor C37 are simultaneously connected to the VDD port of the D/A converter, and the other ends of the capacitor C36 and the capacitor C37 are both grounded;
the CLK port of the D/A converter is connected with a WAVE _ CLK lead, the DATA port of the D/A converter is connected with a WAVE _ DATA lead, and the LOAD port of the D/A converter is connected with a WAVE _ LOAD lead.
Preferably, the number of the REF ports of the D/a converter is four, the four REF ports are respectively a REFA port, a REFB port, a REFC port and a REFD port, and the REFA port, the REFB port, the REFC port and the REFD port are all connected with a first reference voltage VREF 1;
the number of DAC ports of the D/A converter is four, the four DAC ports are respectively a DACA port, a DACB port, a DACC port and a DACD port, and the DACA port, the DACB port, the DACC port and the DACD port are respectively connected with a Channel _ CP, a Channel _ DP, a Channel _ AP and a Channel _ BP.
Preferably, the inverter is provided with a VCC port, a 2OUT port, a 2IN + port and a 1IN + port, the 1IN + port and the 2IN + port are both connected with a second reference voltage VREF2, the 1IN + port is further connected with one end of a capacitor C128, and the other end of the capacitor C128 is grounded;
the 2OUT port is connected with a Channel _ DN;
the VCC port is connected with DC power supply DC1, the VCC port is still connected with the one end of electric capacity C127, the other end ground connection of electric capacity C127.
Preferably, the inverters are two-way inverters, the number of the inverters is two, and the two inverters are respectively a first inverter U23 and a second inverter U22;
a 1 IN-port and a 2 IN-port of the first reverser U23 are respectively connected with a Channel _ CP and a Channel _ DP, a 1 OUT-port and a 2 OUT-port of the first reverser U23 are respectively connected with a Channel _ CN and a Channel _ DN, a resistor R55 is arranged on the Channel _ CP, a resistor R53 is arranged IN parallel on the resistor R55, a resistor R55 is connected with the first reverser U23 IN series, a resistor R56 is arranged on the Channel _ DP, a resistor R54 is arranged IN parallel on the resistor R56, and a resistor R56 is connected with the first reverser U23 IN series;
channel _ AP, Channel _ BP are connected respectively to the 1 IN-port and the 2 IN-port of second reverser U22, Channel _ AN, Channel _ BN are connected respectively to the 1OUT port and the 2OUT port of second reverser U22, be provided with resistance R51 on the Channel _ AP, resistance R51 is parallelly connected and is provided with resistance R49, resistance R51 and second reverser U22 are established ties, be provided with resistance R52 on the Channel _ BP, resistance R52 is parallelly connected and is provided with resistance R50, resistance R52 and second reverser U22 are established ties.
Preferably, the V + port of the selector is connected with a DC power supply DC2, the V + port of the selector is further connected with one end of a capacitor C35, and the other end of the capacitor C35 is grounded;
the GND port of the selector is grounded.
Preferably, the number of the selectors is four, the four selectors are respectively a first selector U10, a second selector U11, a third selector U7 and a fourth selector U8, and a NO port and an NC port of the first selector U10 are respectively connected with Channel _ CP and Channel _ CN;
the NO port and the NC port of the second selector U11 are respectively connected with Channel _ DP and Channel _ DN;
a NO port and AN NC port of the third selector U7 are respectively connected with Channel _ AP and Channel _ AN;
the NO port and the NC port of the fourth selector U8 are connected to Channel _ BP and Channel _ BN, respectively.
In addition, the invention also provides a large-scale dumping type dangerous rock mass combined treatment method, which comprises the following steps,
s1, generating an original waveform,
The digital signal is transmitted to the inside of a D/A converter through a CLK port and a DATA port of the D/A converter, the D/A converter performs accurate sampling under a first reference voltage, the D/A converter converts the digital signal into an analog signal, the analog signal generated by the D/A converter is an original waveform, the original waveform comprises a square wave, a sine wave, a triangular wave, a sawtooth wave, an exponential wave, a fan-shaped wave, a trapezoidal wave and a sharp wave, and one of the DAC ports is determined through a DATA bit of the DATA port to be output;
s2, conveying an original waveform,
The same original waveform is divided into two paths from a DAC port of a D/A converter for output, wherein one path of original waveform is directly output to a selector without processing, the other path of original waveform is firstly transmitted to an inverter for waveform inversion to form a reverse waveform opposite to the original waveform, and then the reverse waveform is transmitted to the selector;
s3, selecting and outputting a waveform,
Two waveforms with the same phase and opposite amplitudes are simultaneously input into the selector, carrier frequency is input through a SELECT port of the selector, the carrier frequency input into the selector controls the selector to SELECT the waveforms, the high level and the low level of the carrier frequency determine the waveform selection of the selector, when the carrier frequency level changes, the selector SELECTs the waveforms by selecting different channels, and the change of the channels causes the change of the positive and negative of the modulated wave;
s4, generating a modulation wave,
The selector selects two waveforms with the same phase and opposite amplitudes under the control of carrier frequency, the waveform selected by the selector is controlled by the high and low levels of the carrier frequency, the switching frequency of the waveforms of different channels is determined by the carrier frequency, when the selector selects an NO port channel, the selector outputs the original waveform of the NO port channel, when the selector selects an NC port channel, the selector outputs the waveform of the NC port channel in the reverse direction, and the selector can rapidly switch the channels to output the opposite waveforms to form the required modulation wave;
s5, outputting a modulated wave,
And after being formed, the modulation wave is transmitted to a power amplifier and a transformer, the output waveform is amplified by the power amplifier and the transformer, and the final modulation wave is output.
Wherein the Channel comprises Channel _ CP, Channel _ CN, Channel _ DP, Channel _ DN, Channel _ AP, Channel _ AN, Channel _ BP, Channel _ BN.
(III) advantageous effects
The invention provides an intermediate frequency electric wave modulation circuit and a modulation method. The method has the following beneficial effects:
1. in the invention, the same waveform is divided into two paths by the DAC port of the D/A converter for output, wherein one path outputs the original waveform without processing, the other path reverses the waveform through the reverser, the two waveforms with the same phase and opposite amplitude enter the selector, the selector is controlled by carrier frequency in an alternative mode, and the waveform output by the D/A converter is reversed through the reverser, thereby reducing the performance consumption of the D/A converter.
2. In the invention, two waveforms in opposite directions are simultaneously input into the selector, the carrier frequency is input into the selector, the selector is controlled to select the channel, the high level and the low level of the carrier frequency determine the channel selection of the selector, when the carrier frequency level changes, the channel change of the selector causes the positive and negative of the modulation wave to change, and then the selector can rapidly and accurately switch the waveform, the switching frequency is determined by the carrier frequency, the D/A converter resource is not occupied, and the performance consumption of the D/A converter is further reduced.
Drawings
FIG. 1 is a schematic block diagram of the modulation of electric waves according to the present invention;
FIG. 2 is a block diagram of the working principle of the present invention;
FIG. 3 is a diagram of an electrical wave modulation circuit according to the present invention;
FIG. 4 is a square wave modulation plot of the present invention;
FIG. 5 is a graph of spike modulation according to the present invention;
FIG. 6 is a sawtooth modulation plot of the present invention;
FIG. 7 is a triangular wave modulation plot of the present invention;
FIG. 8 is a fan modulation plot of the present invention;
FIG. 9 is a trapezoidal wave modulation plot of the present invention;
FIG. 10 is a sine wave modulation plot of the present invention;
FIG. 11 is a graph of exponential wave modulation of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
Examples
An intermediate frequency electric wave modulation circuit as shown IN fig. 1-11, comprising a D/a converter, an inverter and a selector, wherein the model of the D/a converter is TLC5620CD, a REF port of the D/a converter is connected with a first reference voltage VREF1, a maximum voltage of the first reference voltage VERF1 is 2.5V, a zero reference voltage is 1.25V, the D/a converter converts an input digital signal and outputs an analog signal based on the first reference voltage, a DAC port of the D/a converter is simultaneously connected with a 1 IN-port of the inverter and an NO port of the selector, a 1OUT port of the inverter is connected with an NC port of the selector, an NO port of the selector is used for analog signal selection, the NO port and the NC port of the selector are used for waveform selection, the inverter inverts the phase of the analog signal by 180 degrees to change the amplitude direction of the waveform, a SELECT port of the selector is connected with a carrier frequency, the carrier frequency control selector performs waveform selection, and the COM port of the selector outputs the generated analog signal.
The LDAC port of the D/A converter is grounded;
the VDD port of the D/A converter is connected with a direct-current power supply DC1, the power supply voltage of the direct-current power supply DC1 is 5V, the VDD port of the D/A converter is simultaneously connected with a capacitor C36 and a capacitor C37, the other ends of the capacitor C36 and the capacitor C37 are grounded, and C36 and the capacitor C37 are used for filtering alternating current;
the CLK port of the D/A converter is connected with a WAVE _ CLK lead, the WAVE _ CLK lead feeds back the WAVE timing, one end of a resistor 16 is connected to the WAVE _ CLK lead, the DATA port of the D/A converter is connected with a WAVE _ DATA lead, one end of a resistor R17 is connected to the WAVE _ DATA lead, the WAVE _ DATA lead is used for transmitting digital signals, the LOAD port of the D/A converter is connected with a WAVE _ LOAD lead, one end of a resistor R18 is connected to the WAVE _ LOAD lead, the WAVE _ LOAD lead is connected to the D/A converter and controls the output of a DAC port, and the other ends of the resistor R16, the resistor R17 and the resistor R18 are connected with a direct current DC 1.
The number of REF ports of the D/A converter is four, the four REF ports are respectively a REFA port, a REFB port, a REFC port and a REFD port, the REFA port, the REFB port, the REFC port and the REFD port are all connected with a first reference voltage VREF1, and the REF ports refer to reference and reference ports of the D/A converter;
the number of DAC ports of the D/A converter is four, the four DAC ports are respectively DACA ports, DACB ports, DACC ports and DACD ports, the outputs of the four DAC ports are controlled by the LOAD ports, the DACA ports, DACB ports, DACC ports and DACD ports are respectively connected with Channel _ CP, Channel _ DP, Channel _ AP and Channel _ BP, wherein "Channel" in the Channel _ CP represents a Channel and a Channel, and "CP" represents an anode with the sequence number of C, and similarly, "AP", "BP" and "CP" in the Channel _ AP, the Channel _ BP and the Channel _ DP represent an anode with the sequence number of A, an anode with the sequence number of B and an anode with the sequence number of D respectively.
The inverter is provided with a VCC port, a 2OUT port, a 2IN + port and a 1IN + port, the 1IN + port and the 2IN + port are both connected with a second reference voltage VREF2, the maximum voltage of the second reference voltage VREF2 is 1.24V, the zero reference voltage of the second reference voltage VREF2 is 0.62V, the 1IN + port is also connected with one end of a capacitor C128, the other end of the capacitor C128 is grounded, and the capacitor C128 is used for filtering alternating current;
the 2OUT port is connected with a Channel _ DN;
the VCC port is connected with a DC power supply DC1, one end of a capacitor C127 is also connected with the VCC port, and the other end of the capacitor C127 is grounded.
The reverser is two-way reverser, the number of the reversers is two, the two reversers are respectively a first reverser U23 and a second reverser U22, wherein U22 and U23 both represent the serial number of the reversers, and the model of the reversers is LM358DR 2G;
a 1 IN-port and a 2 IN-port of the first reverser U23 are respectively connected with a Channel _ CP and a Channel _ DP, a 1 OUT-port and a 2 OUT-port of the first reverser U23 are respectively connected with a Channel _ CN and a Channel _ DN, a resistor R55 is arranged on the Channel _ CP, the Channel _ CP is a multi-section Channel, the resistor R55 is connected on the Channel _ CP, the resistor R55 is provided with a resistor R53 IN parallel, a resistor R55 is connected with the first reverser U23 IN series, a resistor R56 is arranged on the Channel _ DP, the Channel _ DP is a multi-section connecting Channel, the resistor R56 is connected on the Channel _ DP, the resistor R56 is provided with a resistor R54 IN parallel, and the resistor R56 is connected with the first reverser U23 IN series;
a 1 IN-port and a 2 IN-port of the second reverser U22 are respectively connected with Channel _ AP and Channel _ BP, a 1 OUT-port and a 2 OUT-port of the second reverser U22 are respectively connected with Channel _ AN and Channel _ BN, a resistor R51 is arranged on the Channel _ AP, the Channel _ AP is a multi-section Channel, the resistor R51 is connected on the Channel _ AP, the resistor R51 is provided with a resistor R49 IN parallel, a resistor R51 is connected with the second reverser U22 IN series, a resistor R52 is arranged on the Channel _ BP, the Channel _ BP is a multi-section Channel, the resistor R52 is connected on the Channel _ BP, the resistor R52 is provided with a resistor R50 IN parallel, and the resistor R52 is connected with the second reverser U22 IN series;
wherein "AN" in Channel _ BN represents a negative electrode with a serial number a, and "BN", "CN" and "DN" in Channel _ BN, Channel _ CN and Channel _ DN respectively represent a negative electrode with a serial number B, a negative electrode with a serial number C and a negative electrode with a serial number D in the same manner;
the resistor R49, the resistor R50, the resistor R51, the resistor R52, the resistor R53, the resistor R54, the resistor R55 and the resistor R56 are all used for improving the loading capacity of the output waveform, and the resistance values are the same.
The V + port of the selector is connected with a direct-current power supply DC2, the power supply voltage of the direct-current power supply DC2 is 3.3V, the V + port of the selector is further connected with one end of a capacitor C35, the other end of the capacitor C35 is grounded, and the capacitor C35 is used for filtering alternating current.
The number of the selectors is four, the type of the selectors is NLAST4599DFT2G, the four selectors are a first selector U10, a second selector U11, a third selector U7 and a fourth selector U8 respectively, wherein U10, U11, U7 and U8 all represent the numbers of the selectors, and NO ports and NC ports of the first selector U10 are connected with Channel _ CP and Channel _ CN respectively;
the NO port and the NC port of the second selector U11 are connected with Channel _ DP and Channel _ DN, respectively;
the NO port and the NC port of the third selector U7 are connected with Channel _ AP and Channel _ AN, respectively;
channel _ BP and Channel _ BN are connected to the NO port and NC port of the fourth selector U8, respectively.
The DACA port of the D/A converter is directly connected with the NO port of the selector U10 through a Channel _ CP, one end of a resistor R55 is connected with the node of the Channel _ CP, the other end of a resistor R55 is connected with the 1 IN-port of a first reverser U23 through the Channel _ CP, and the 1OUT port of the first reverser U23 is connected with the NC port of the selector U10 through the Channel _ CN;
the DACB port of the D/A converter is directly connected with the NO port of the selector U11 through Channel _ DP, one end of a resistor R56 is connected with the node of the Channel _ DP, the other end of a resistor R56 is connected with the 2 IN-port of the first reverser U23 through the Channel _ DP, and the 2OUT port of the first reverser U23 is connected with the NC port of the selector U11 through the Channel _ DN;
the DACC port of the D/A converter is directly connected with the NO port of the selector U7 through a Channel _ AP, one end of a resistor R51 is connected with the node of the Channel _ AP, the other end of the resistor R51 is connected with the 1 IN-port of the second reverser U22 through the Channel _ AP, and the 1OUT port of the second reverser U22 is connected with the NC port of the selector U7 through the Channel _ AN;
the DACD port of the D/a converter is directly connected to the NO port of the selector U8 through Channel _ BP, one end of the resistor R52 is connected to the node of Channel _ BP, the other end of the resistor R52 is connected to the 1 IN-port of the second inverter U22 through Channel _ BP, and the 1OUT port of the second inverter U22 is connected to the NC port of the selector U8 through Channel _ BN.
The invention relates to a modulation method of an intermediate frequency electric wave modulation circuit, which comprises the following steps:
s1, generating an original waveform,
The digital signal is transmitted to the inside of a D/A converter through a CLK port and a DATA port of the D/A converter, the D/A converter performs accurate sampling under a first reference voltage, the D/A converter converts the digital signal into an analog signal, the analog signal generated by the D/A converter is an original waveform, the original waveform comprises a square wave, a sine wave, a triangular wave, a sawtooth wave, an exponential wave, a fan-shaped wave, a trapezoidal wave and a sharp wave, and one of the DAC ports is determined through a DATA bit of the DATA port to be output;
s2, conveying an original waveform,
The same original waveform is divided into two paths from a DAC port of a D/A converter for output, wherein one path of original waveform is directly output to a selector without processing, the other path of original waveform is firstly transmitted to an inverter for waveform inversion to form a reverse waveform opposite to the original waveform, and then the reverse waveform is transmitted to the selector;
s3, selecting and outputting a waveform,
Two waveforms with the same phase and opposite amplitudes are simultaneously input into the selector, carrier frequency is input through a SELECT port of the selector, the carrier frequency input into the selector controls the selector to SELECT the waveforms, the high level and the low level of the carrier frequency determine the waveform selection of the selector, when the carrier frequency level changes, the selector SELECTs the waveforms by selecting different channels, and the change of the channels causes the change of the positive and negative of the modulated wave;
s4, generating a modulation wave,
The selector selects two waveforms with the same phase and opposite amplitudes under the control of carrier frequency, the waveform selected by the selector is controlled by the high and low levels of the carrier frequency, the switching frequency of the waveforms of different channels is determined by the carrier frequency, when the selector selects an NO port channel, the selector outputs the original waveform of the NO port channel, when the selector selects an NC port channel, the selector outputs the waveform of the NC port channel in the reverse direction, and the selector can rapidly switch the channels to output the opposite waveforms to form the required modulation wave;
s5, outputting a modulated wave,
And after being formed, the modulation wave is transmitted to a power amplifier and a transformer, the output waveform is amplified by the power amplifier and the transformer, and the final modulation wave is output.
Wherein, the Channel comprises Channel _ CP, Channel _ CN, Channel _ DP, Channel _ DN, Channel _ AP, Channel _ AN, Channel _ BP, Channel _ BN.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that 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 (9)
1. The medium-frequency radio wave modulation circuit is characterized by comprising a D/A converter, an inverter and a selector, wherein a REF port of the D/A converter is connected with a first reference voltage (VREF 1), the D/A converter takes the first reference voltage as a reference, a DAC port of the D/A converter is simultaneously connected with a 1 IN-port of the inverter and an NO port of the selector, a 1OUT port of the inverter is connected with an NC port of the selector, an NO port of the selector is used for analog signal selection, the phase of an analog signal is inverted by 180 degrees by the inverter, a SELECT port of the selector is connected with a carrier frequency, and the COM port of the selector outputs the generated analog signal.
2. The intermediate frequency electric wave modulation circuit according to claim 1, characterized in that: the LDAC port of the D/A converter is grounded;
a direct current power supply (DC 1) is connected to the VDD port of the D/A converter, a capacitor (C36) and a capacitor (C37) are connected to the VDD port of the D/A converter at the same time, and the other ends of the capacitor (C36) and the capacitor (C37) are grounded;
the CLK port of the D/A converter is connected with a WAVE _ CLK lead, the DATA port of the D/A converter is connected with a WAVE _ DATA lead, and the LOAD port of the D/A converter is connected with a WAVE _ LOAD lead.
3. The intermediate frequency electric wave modulation circuit according to claim 2, characterized in that: the number of REF ports of the D/A converter is four, the four REF ports are respectively a REFA port, a REFB port, a REFC port and a REFD port, and the REFA port, the REFB port, the REFC port and the REFD port are all connected with a first reference voltage (VREF 1);
the number of DAC ports of the D/A converter is four, the four DAC ports are respectively a DACA port, a DACB port, a DACC port and a DACD port, and the DACA port, the DACB port, the DACC port and the DACD port are respectively connected with a Channel _ CP, a Channel _ DP, a Channel _ AP and a Channel _ BP.
4. The intermediate frequency electric wave modulation circuit according to claim 3, characterized in that: the inverter is provided with a VCC port, a 2OUT port, a 2IN + port and a 1IN + port, the 1IN + port and the 2IN + port are both connected with a second reference voltage (VREF 2), the 1IN + port is also connected with one end of a capacitor (C128), and the other end of the capacitor (C128) is grounded;
the 2OUT port is connected with a Channel _ DN;
the VCC port is connected with direct current power supply (DC 1), the VCC port is still connected with the one end of electric capacity (C127), the other end ground connection of electric capacity (C127).
5. The intermediate frequency electric wave modulation circuit according to claim 4, characterized in that: the inverters are two-way inverters, the number of the inverters is two, and the two inverters are respectively a first inverter (U23) and a second inverter (U22);
the first inverter (U23) is characterized IN that a 1 IN-port and a 2 IN-port of the first inverter (U23) are respectively connected with Channel _ CP and Channel _ DP, a 1 OUT-port and a 2 OUT-port of the first inverter (U23) are respectively connected with Channel _ CN and Channel _ DN, a resistor (R55) is arranged on the Channel _ CP, the resistor (R55) is parallelly connected with a resistor (R53), the resistor (R55) is serially connected with the first inverter (U23), a resistor (R56) is arranged on the Channel _ DP, the resistor (R56) is parallelly connected with a resistor (R54), and the resistor (R56) is serially connected with the first inverter (U23);
channel _ AP, Channel _ BP are connected respectively to the 1 IN-port and the 2 IN-port of second reverser (U22), Channel _ AN, Channel _ BN are connected respectively to the 1OUT port and the 2OUT port of second reverser (U22), be provided with resistance (R51) on the Channel _ AP, resistance (R51) are provided with resistance (R49) IN parallel, and resistance (R51) and second reverser (U22) are established ties, be provided with resistance (R52) on the Channel _ BP, resistance (R52) are provided with resistance (R50) IN parallel, and resistance (R52) and second reverser (U22) are established ties.
6. The intermediate frequency electric wave modulation circuit according to claim 5, characterized in that: the V + port of the selector is connected with a direct current power supply (DC 2), one end of a capacitor (C35) is further connected with the V + port of the selector, and the other end of the capacitor (C35) is grounded.
7. The intermediate frequency electric wave modulation circuit according to claim 6, characterized in that: the number of the selectors is four, the four selectors are respectively a first selector (U10), a second selector (U11), a third selector (U7) and a fourth selector (U8), and a NO port and an NC port of the first selector (U10) are respectively connected with a Channel _ CP and a Channel _ CN;
the NO port and the NC port of the second selector (U11) are respectively connected with Channel _ DP and Channel _ DN;
the NO port and the NC port of the third selector (U7) are respectively connected with Channel _ AP and Channel _ AN;
the NO port and the NC port of the fourth selector (U8) are connected with Channel _ BP and Channel _ BN respectively.
8. A modulation method of an intermediate frequency radio wave modulation circuit is characterized by comprising the following steps:
s1, generating an original waveform,
The digital signal is transmitted to the inside of a D/A converter through a CLK port and a DATA port of the D/A converter, the D/A converter performs accurate sampling under a first reference voltage, the D/A converter converts the digital signal into an analog signal, the analog signal generated by the D/A converter is an original waveform, and one of DAC ports is determined through DATA bits of the DATA port to be output;
s2, conveying an original waveform,
The same original waveform is divided into two paths from a DAC port of a D/A converter for output, wherein one path of original waveform is directly output to a selector without processing, the other path of original waveform is firstly transmitted to an inverter for waveform inversion to form a reverse waveform opposite to the original waveform, and then the reverse waveform is transmitted to the selector;
s3, selecting and outputting a waveform,
Two waveforms with the same phase and opposite amplitudes are simultaneously input into the selector, carrier frequency is input through a SELECT port of the selector, the carrier frequency input into the selector controls the selector to SELECT the waveforms, the high level and the low level of the carrier frequency determine the waveform selection of the selector, when the carrier frequency level changes, the selector SELECTs the waveforms by selecting different channels, and the change of the channels causes the change of the positive and negative of the modulated wave;
s4, generating a modulation wave,
The selector selects two waveforms with the same phase and opposite amplitudes under the control of carrier frequency, the waveform selected by the selector is controlled by the high and low levels of the carrier frequency, the switching frequency of the waveforms of different channels is determined by the carrier frequency, when the selector selects an NO port channel, the selector outputs the original waveform of the NO port channel, when the selector selects an NC port channel, the selector outputs the waveform of the NC port channel in the reverse direction, and the selector can rapidly switch the channels to output the opposite waveforms to form the required modulation wave;
s5, outputting a modulated wave,
And after being formed, the modulation wave is transmitted to a power amplifier and a transformer, the output waveform is amplified by the power amplifier and the transformer, and the final modulation wave is output.
9. The modulation method of the intermediate frequency electric wave modulation circuit according to claim 8, characterized in that: the original waveform comprises square waves, sine waves, triangular waves, sawtooth waves, exponential waves, fan waves, trapezoidal waves and sharp waves.
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