CN105934011B - A kind of integrated radiofrequency signal control circuit and method - Google Patents
A kind of integrated radiofrequency signal control circuit and method Download PDFInfo
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- CN105934011B CN105934011B CN201610281608.5A CN201610281608A CN105934011B CN 105934011 B CN105934011 B CN 105934011B CN 201610281608 A CN201610281608 A CN 201610281608A CN 105934011 B CN105934011 B CN 105934011B
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
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Abstract
The present invention relates to a kind of integrated radiofrequency signal control circuits and method, comprising: crystal oscillating circuit is connected with frequency synthesizer, for exporting reference signal；Control/power supply circuit is connected with the frequency synthesizer, for parameter information to be placed in the register of the frequency synthesizer by SPI interface circuitry, controls the output of the frequency synthesizer；Frequency synthesizer is connected with balun circuit, for according to the parameter information or the corresponding difference radio-frequency signal of reference signal output in the register；Balun circuit is connected with the frequency synthesizer, for the corresponding difference radio-frequency signal to be converted into corresponding single-ended signal.The present invention realizes the control that frequency, phase, size, on and off are carried out to radiofrequency signal, and ensures that output power is sufficiently large.
Description
Technical field
The present invention relates to semiconductor microwave technical fields, more particularly to a kind of integrated radiofrequency signal control circuit and side
Method.
Background technique
Whether the frequency microwave generator in semiconductor microwave oven is related to entire microwave source system can be reliablely and stablely
Work.Frequency microwave generator in the prior art generates radiofrequency signal using LDMOS microwave amplifier tube self-oscillation, specifically may be used
Referring to Fig.1, the concussion in fixed frequency range is realized by positive feedback and export resonance network, positive feedback guarantees self-oscillation, humorous
Vibrating network guarantees the frequency of self-oscillation, to obtain required radiofrequency signal, resonant network can be by changing resonance point
It realizes that frequency adjusts, but phase adjustment can not be carried out, and job insecurity.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of integrated radiofrequency signal control circuits and method, to solve
How the control of frequency, phase, size, on and off is carried out to radiofrequency signal, and ensure the sufficiently large problem of output power.
The technical scheme to solve the above technical problems is that a kind of integrated radiofrequency signal control circuit, comprising:
Crystal oscillating circuit is connected with frequency synthesizer, for exporting reference signal；
Control/power supply circuit is connected with the frequency synthesizer, for being set parameter information by SPI interface circuitry
In the register for entering the frequency synthesizer, the output of the frequency synthesizer is controlled；
Frequency synthesizer is connected with balun circuit, for according in the register parameter information or the reference
Signal exports corresponding difference radio-frequency signal；
Balun circuit is connected with the frequency synthesizer, for the corresponding difference radio-frequency signal to be converted into pair
The single-ended signal answered.
Further, the crystal oscillating circuit is also used to provide frequency by the reference signal for the frequency synthesizer and drive
It is dynamic.
Further, the frequency synthesizer includes:
The reference signal carries out the reference signal amplified after isolation and differential amplification by buffer amplifier；
The reference signal of the amplification carries out frequency by phase discriminator and phase controlling obtains frequency signal；
The frequency signal carries out Fractional-N frequency by Fractional-N divider and obtains low frequency signal；
High-frequency PLL exports the first high-frequency signal；
First high-frequency signal and the low frequency signal obtain the second high-frequency signal by synthesizer；
Second high-frequency signal obtains I/Q signal by 2 power-devided circuits；
The I/Q signal obtains modulated signal by I/Q modulator；
The modulated signal obtains filtering signal by low-pass filter；
The filtering signal passes through limiter, switching circuit and difference amplifier respectively and obtains the difference radio-frequency signal.
Further, the frequency synthesizer further include:
When the parameter information is the first data, the frequency synthesizer is in running order；
When the parameter information is the second data, the frequency synthesizer is in off position；
When the supplemental characteristic is third data, the frequency synthesizer output power difference radio-frequency signal；
When the supplemental characteristic is four data, the frequency synthesizer output frequency difference radio-frequency signal；
When the supplemental characteristic is five data, the frequency synthesizer output phase difference radiofrequency signal.
Further, in the SPI interface circuitry, one end of capacitor C5 respectively with the control/power supply circuit and resistance
One end of R1 is connected, and the other end of the resistance R1 is connected with the pin 26 of the frequency synthesizer, the capacitor C5's
Other end ground connection, one end of capacitor C8 are connected with one end of the control/power supply circuit and resistance R3 respectively, the resistance R3
The other end be connected with the pin 27 of the frequency synthesizer, the other end of capacitor C8 ground connection, the one of the capacitor C9
End is connected with one end of the control/power supply circuit and resistance R6 respectively, and the other end of the resistance R6 and the frequency are comprehensive
The pin 28 of clutch is connected, the other end ground connection of the capacitor C9.
Further, in the balun circuit, the pin 22 and inductance L1 of one end of capacitor C6 and the frequency synthesizer
One end be connected, the other end of the inductance L1 connects supply voltage, the other end of the capacitor C6 respectively with the frequency
The pin 23 of synthesizer is connected with one end of inductance L2, and the other end of the inductance L2 connects the supply voltage, the electricity
Feel one end of one end connection capacitor C3 of L2, the other end of capacitor C3 one end with one end of inductance L3 and capacitor C4 respectively
It is connected, the other end of inductance L3 ground connection, the other end of the capacitor C4 is connected and fixed attenuator, and the one of the inductance L1
One end of end connection capacitor C7, the other end of the capacitor C7 are connected with one end of one end of inductance L4 and capacitor C10 respectively,
The other end of the capacitor C10 is grounded, and the other end of the inductance L4 connects the fixed attenuator.
To achieve the above object, the present invention also provides a kind of for a kind of integrated radiofrequency signal control as described above
Method, comprising:
Export reference signal；
Parameter information is placed in the register of frequency synthesizer by SPI interface circuitry, controls the frequency synthesizer
Output；
According to the parameter information or the corresponding difference radio-frequency signal of reference signal output in the register；
The corresponding difference radio-frequency signal is converted into corresponding single-ended signal.
Further, the method also includes:
Frequency driving is provided by the reference signal for the frequency synthesizer.
Further, the parameter information according in the register or the reference signal export corresponding differential radio frequency
Signal includes:
The reference signal carries out the reference signal amplified after isolation and differential amplification by buffer amplifier；
The reference signal of the amplification carries out frequency by phase discriminator and phase controlling obtains frequency signal；
The frequency signal carries out Fractional-N frequency by Fractional-N divider and obtains low frequency signal；
High-frequency PLL exports the first high-frequency signal；
First high-frequency signal and the low frequency signal obtain the second high-frequency signal by synthesizer；
Second high-frequency signal obtains I/Q signal by 2 power-devided circuits；
The I/Q signal obtains modulated signal by I/Q modulator；
The modulated signal obtains filtering signal by low-pass filter；
The filtering signal passes through limiter, switching circuit and difference amplifier respectively and obtains the difference radio-frequency signal.
Further, the parameter information according in the register or the reference signal export corresponding differential radio frequency
Signal further include:
When the parameter information is the first data, the frequency synthesizer is in running order；
When the parameter information is the second data, the frequency synthesizer is in off position；
When the supplemental characteristic is third data, the frequency synthesizer output power difference radio-frequency signal；
When the supplemental characteristic is four data, the frequency synthesizer output frequency difference radio-frequency signal；
When the supplemental characteristic is five data, the frequency synthesizer output phase difference radiofrequency signal.
The beneficial effects of the present invention are: crystal oscillating circuit exports reference signal, control/power supply circuit passes through SPI interface circuitry
By in the register of parameter information merging frequency synthesizer, the output of frequency synthesizer is controlled, frequency synthesizer is according to register
Interior parameter information and reference signal export corresponding difference radio-frequency signal, carry out frequency, phase to radiofrequency signal to realize
The control of position, size, on and off, and ensure that output power is sufficiently large.
Detailed description of the invention
Fig. 1 is prior art semiconductor microwave oven schematic diagram；
Fig. 2 is a kind of integrated radiofrequency signal control circuit schematic diagram provided in an embodiment of the present invention；
Fig. 3 is SPI interface circuitry schematic diagram provided in an embodiment of the present invention；
Fig. 4 is balun circuit schematic diagram provided in an embodiment of the present invention；
Fig. 5 is the schematic diagram of internal structure of frequency synthesizer provided in an embodiment of the present invention；
Fig. 6 is a kind of integrated radiofrequency signal control method flow chart provided in an embodiment of the present invention.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
Fig. 2 is a kind of integrated radiofrequency signal control circuit schematic diagram provided in an embodiment of the present invention.
Referring to Fig. 2, control circuit include crystal oscillating circuit, control/power supply circuit, frequency synthesizer, SPI interface circuitry and bar
Human relations circuit.
The output end of crystal oscillating circuit is connected with frequency synthesizer, and the output end of frequency synthesizer is connected with balun circuit
It connects, the control terminal of frequency synthesizer is connected by SP PCI interface circuit with control/power supply circuit.
Crystal oscillating circuit is connected with frequency synthesizer, for exporting reference signal.
Here, reference signal 16MHz.
Control/power supply circuit is connected with the frequency synthesizer, for being set parameter information by SPI interface circuitry
In the register for entering the frequency synthesizer, the output of the frequency synthesizer is controlled.
Frequency synthesizer is connected with balun circuit, for according in the register parameter information or the reference
Signal exports corresponding difference radio-frequency signal.
Here, frequency synthesizer can be applied in semiconductor microwave oven, be functionally integrated with voltage controlled oscillator, frequency modulation,
Phase modulation, amplitude modulation, switch and difference amplifier greatly reduce the design complexities of control circuit.Pass through frequency synthesizer, crystal oscillator
Circuit, control/power supply circuit and balun circuit export corresponding difference radio-frequency signal, it is ensured that output power is sufficiently large.
Balun circuit is connected with the frequency synthesizer, for the corresponding difference radio-frequency signal to be converted into pair
The single-ended signal answered.
Here, corresponding difference radio-frequency signal is 2.4GHz~2.5GHz.
According to an embodiment of the invention, the crystal oscillating circuit is also used to through the reference signal be the frequency synthesizer
Frequency driving is provided.
According to an embodiment of the invention, the frequency synthesizer includes:
The reference signal carries out the reference signal amplified after isolation and differential amplification by buffer amplifier；
The reference signal of the amplification carries out frequency by phase discriminator and phase controlling obtains frequency signal；
The frequency signal carries out Fractional-N frequency by Fractional-N divider and obtains low frequency signal；
High-frequency PLL exports the first high-frequency signal；
First high-frequency signal and the low frequency signal obtain the second high-frequency signal by synthesizer；
Second high-frequency signal obtains I Q signal by 2 power-devided circuits；
The I/Q signal obtains modulated signal by I/Q modulator；
The modulated signal obtains filtering signal by low-pass filter；
The filtering signal passes through limiter, switching circuit and difference amplifier respectively and obtains the difference radio-frequency signal.
Here, it specifically can refer to the schematic diagram of internal structure of frequency synthesizer as shown in Figure 5, reference signal passes through buffering
Amplifier, phase discriminator, Fractional-N divider, synthesizer, 2 power-devided circuits, I/Q modulator, low-pass filter, limiter, switch electricity
Road and difference amplifier obtain difference radio-frequency signal.
The reference signal of amplification carries out frequency by phase discriminator and phase controlling obtains frequency signal, and phase discriminator can be by outside
Pin controls phase demodulation frequency.
External digital controlled signal controls the second high-frequency signal by I/Q modulator, including frequency modulation, phase modulation,
Exactly external digital controlled signal is controlled by frequency or phase of the I/Q modulator to the second high-frequency signal.
According to an embodiment of the invention, the frequency synthesizer further include:
When the parameter information is the first data, the frequency synthesizer is in running order；
When the parameter information is the second data, the frequency synthesizer is in off position；
When the supplemental characteristic is third data, the frequency synthesizer output power difference radio-frequency signal；
When the supplemental characteristic is four data, the frequency synthesizer output frequency difference radio-frequency signal；
When the supplemental characteristic is five data, the frequency synthesizer output phase difference radiofrequency signal.
Here, when the first data can be such as, but not limited to, when being specially 1, frequency synthesizer is in running order；
When the second data can be such as, but not limited to, when being specially 0, frequency synthesizer is in off position；When third data can
To be such as, but not limited to, when being specially 3, frequency synthesizer output power is the difference radio-frequency signal of 0.5W；When the 4th data
It can be such as, but not limited to, when being specially 4, frequency synthesizer output frequency is the difference radio-frequency signal of 17MHz；When the 5th
Data can be such as, but not limited to, when being specially 5, frequency synthesizer output phase is 30 degree of differential frequency signal.
According to an embodiment of the invention, control/power supply circuit controls the output of frequency synthesizer by SPI interface circuitry,
Specifically can refer to SPI interface circuitry schematic diagram as shown in Figure 3, one end of capacitor C5 respectively with the control/power supply circuit and
One end of resistance R1 is connected, and the other end of the resistance R1 is connected with the pin 26 of the frequency synthesizer, the capacitor
The other end of C5 is grounded, and one end of capacitor C8 is connected with one end of the control/power supply circuit and resistance R3 respectively, the electricity
The other end of resistance R3 is connected with the pin 27 of the frequency synthesizer, the other end ground connection of the capacitor C8, the capacitor C9
One end be connected respectively with one end of the control/power supply circuit and resistance R6, the other end of the resistance R6 and the frequency
The pin 28 of rate synthesizer is connected, the other end ground connection of the capacitor C9.
According to an embodiment of the invention, specifically can refer to balun circuit principle as shown in Figure 4 in the balun circuit
Figure, specifically, one end of capacitor C6 is connected with one end of the pin 22 of the frequency synthesizer and inductance L1, the inductance L1
The other end connect supply voltage, the other end of the capacitor C6 respectively with the pin 23 of the frequency synthesizer and inductance L2
One end is connected, and the other end of the inductance L2 connects the supply voltage, and one end of the inductance L2 connects the one of capacitor C3
End, the other end of the capacitor C3 are connected with one end of one end of inductance L3 and capacitor C4 respectively, and the inductance L3's is another
End ground connection, the other end of the capacitor C4 are connected and fixed attenuator, and one end of one end connection capacitor C7 of the inductance L1 is described
The other end of capacitor C7 is connected with one end of one end of inductance L4 and capacitor C10 respectively, another termination of the capacitor C10
The other end on ground, the inductance L4 connects the fixed attenuator.
A kind of integrated radiofrequency signal control circuit provided by the invention exports reference signal by crystal oscillating circuit, control/
Parameter information is placed in the register of frequency synthesizer by power supply circuit by SPI interface circuitry, controls the defeated of frequency synthesizer
Out, frequency synthesizer is according to the parameter information or the corresponding difference radio-frequency signal of reference signal output in register, to realize
The control of frequency, phase, size, on and off is carried out to radiofrequency signal, and ensures that output power is sufficiently large.
Fig. 6 is a kind of integrated radiofrequency signal control method flow chart provided in an embodiment of the present invention.
Referring to Fig. 6, step S1, reference signal is exported.
Parameter information is placed in the register of frequency synthesizer by SPI interface circuitry, controls the frequency by step S2
The output of synthesizer.
Step S3, according to the parameter information or the corresponding differential radio frequency letter of reference signal output in the register
Number.
The corresponding difference radio-frequency signal is converted into corresponding single-ended signal by step S4.
According to an embodiment of the invention, the method also includes:
Frequency driving is provided by the reference signal for the frequency synthesizer.
According to an embodiment of the invention, the parameter information according in the register or reference signal output pair
The difference radio-frequency signal answered includes:
The reference signal carries out the reference signal amplified after isolation and differential amplification by buffer amplifier；
The reference signal of the amplification carries out frequency by phase discriminator and phase controlling obtains frequency signal；
The frequency signal carries out Fractional-N frequency by Fractional-N divider and obtains low frequency signal；
High-frequency PLL exports the first high-frequency signal；
First high-frequency signal and the low frequency signal obtain the second high-frequency signal by synthesizer；
Second high-frequency signal obtains I Q signal by 2 power-devided circuits；
The I/Q signal obtains modulated signal by I/Q modulator；
The modulated signal obtains filtering signal by low-pass filter；
The filtering signal passes through limiter, switching circuit and difference amplifier respectively and obtains the difference radio-frequency signal.
According to an embodiment of the invention, the parameter information according in the register or reference signal output pair
The difference radio-frequency signal answered further include:
When the parameter information is the first data, the frequency synthesizer is in running order；
When the parameter information is the second data, the frequency synthesizer is in off position；
When the supplemental characteristic is third data, the frequency synthesizer output power difference radio-frequency signal；
When the supplemental characteristic is four data, the frequency synthesizer output frequency difference radio-frequency signal；
When the supplemental characteristic is five data, the frequency synthesizer output phase difference radiofrequency signal.
A kind of integrated radiofrequency signal control method provided by the invention connects by exporting reference signal, and by SPI
Mouth circuit controls the output of frequency synthesizer, according in register in the register of parameter information merging frequency synthesizer
Parameter information or reference signal export corresponding difference radio-frequency signal, carry out frequency, phase, big to radiofrequency signal to realize
Small, on and off control, and ensure that output power is sufficiently large.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of integrated radiofrequency signal control circuit characterized by comprising
Crystal oscillating circuit is connected with frequency synthesizer, for exporting reference signal；
Control/power supply circuit is connected with the frequency synthesizer, for parameter information to be placed in institute by SPI interface circuitry
It states in the register of frequency synthesizer, controls the output of the frequency synthesizer；
Frequency synthesizer is connected with balun circuit, for according in the register parameter information or the reference signal
Export corresponding difference radio-frequency signal；
Balun circuit is connected with the frequency synthesizer, corresponding for the corresponding difference radio-frequency signal to be converted into
Single-ended signal,
Wherein, the frequency synthesizer includes:
The reference signal is carried out the reference signal amplified after isolation and differential amplification by buffer amplifier；
The reference signal of the amplification is carried out frequency and phase controlling obtains frequency signal by phase discriminator；
Frequency signal progress Fractional-N frequency is obtained low frequency signal by Fractional-N divider；
High-frequency PLL exports the first high-frequency signal；
Synthesizer synthesizes first high-frequency signal and the low frequency signal to obtain the second high-frequency signal；
2 power-devided circuits obtain I/Q signal to second high frequency signals；
I/Q modulator handles to obtain modulated signal to the I/Q signal；
Low-pass filter handles to obtain filtering signal to the modulated signal；
Limiter, switching circuit and difference amplifier successively handle the filtering signal to obtain the difference radio-frequency signal.
2. a kind of integrated radiofrequency signal control circuit according to claim 1, which is characterized in that the crystal oscillating circuit is also
For providing frequency driving by the reference signal for the frequency synthesizer.
3. a kind of integrated radiofrequency signal control circuit according to claim 1 or 2, which is characterized in that
In the SPI interface circuitry, one end of capacitor C5 is connected with one end of the control/power supply circuit and resistance R1 respectively
It connects, the other end of the resistance R1 is connected with the pin 26 of the frequency synthesizer, the other end ground connection of the capacitor C5, electricity
The one end for holding C8 is connected with one end of the control/power supply circuit and resistance R3 respectively, the other end of the resistance R3 and institute
The pin 27 for stating frequency synthesizer is connected, the other end of capacitor C8 ground connection, one end of the capacitor C9 respectively with it is described
Control/power supply circuit is connected with one end of resistance R6, the other end of the resistance R6 and the pin 28 of the frequency synthesizer
It is connected, the other end ground connection of the capacitor C9.
4. a kind of integrated radiofrequency signal control circuit according to claim 3, which is characterized in that
In the balun circuit, one end of capacitor C6 is connected with one end of the pin 22 of the frequency synthesizer and inductance L1
It connects, the other end of the inductance L1 connects supply voltage, and the other end of the capacitor C6 draws with the frequency synthesizer respectively
Foot 23 is connected with one end of inductance L2, and the other end of the inductance L2 connects the supply voltage, one end of the inductance L2
One end of capacitor C3 is connected, the other end of the capacitor C3 is connected with one end of one end of inductance L3 and capacitor C4 respectively, institute
The other end ground connection of inductance L3 is stated, the other end of the capacitor C4 is connected and fixed attenuator, and one end of the inductance L1 connects electricity
Hold one end of C7, the other end of the capacitor C7 is connected with one end of one end of inductance L4 and capacitor C10 respectively, the capacitor
The other end of C10 is grounded, and the other end of the inductance L4 connects the fixed attenuator.
5. it is a kind of for a kind of control method of integrated radiofrequency signal control circuit according to any one of claims 1-4,
It is characterized in that, which comprises
Export reference signal；
Parameter information is placed in the register of frequency synthesizer by SPI interface circuitry, controls the defeated of the frequency synthesizer
Out；
According to the parameter information or the corresponding difference radio-frequency signal of reference signal output in the register；
The corresponding difference radio-frequency signal is converted into corresponding single-ended signal,
Wherein, the parameter information according in the register or the reference signal export corresponding difference radio-frequency signal packet
It includes:
The reference signal carries out the reference signal amplified after isolation and differential amplification by buffer amplifier；
The reference signal of the amplification carries out frequency by phase discriminator and phase controlling obtains frequency signal；
The frequency signal carries out Fractional-N frequency by Fractional-N divider and obtains low frequency signal；
High-frequency PLL exports the first high-frequency signal；
First high-frequency signal and the low frequency signal obtain the second high-frequency signal by synthesizer；
Second high-frequency signal obtains I/Q signal by 2 power-devided circuits；
The I/Q signal obtains modulated signal by I/Q modulator；
The modulated signal obtains filtering signal by low-pass filter；
The filtering signal passes sequentially through limiter, switching circuit and difference amplifier and obtains the difference radio-frequency signal.
6. a kind of integrated radiofrequency signal control method according to claim 5, which is characterized in that the method is also wrapped
It includes:
Frequency driving is provided by the reference signal for the frequency synthesizer.
7. a kind of integrated radiofrequency signal control method according to claim 5, which is characterized in that described to be posted according to
Parameter information or the reference signal in storage export corresponding difference radio-frequency signal further include:
When the parameter information is the first data, the frequency synthesizer is in running order；
When the parameter information is the second data, the frequency synthesizer is in off position；
When the supplemental characteristic is third data, the frequency synthesizer output power difference radio-frequency signal；
When the supplemental characteristic is four data, the frequency synthesizer output frequency difference radio-frequency signal；
When the supplemental characteristic is five data, the frequency synthesizer output phase difference radiofrequency signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2953425A1 (en) * | 2014-06-03 | 2015-12-09 | Nxp B.V. | Radio frequency heating apparatus |
| CN105227183A (en) * | 2015-11-16 | 2016-01-06 | 中国电子科技集团公司第四十三研究所 | A kind of frequency agility rate source of low spurious |
| CN105423363A (en) * | 2016-01-06 | 2016-03-23 | 广东美的厨房电器制造有限公司 | Microwave source system, microwave oven and execution method in microwave source system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2953425A1 (en) * | 2014-06-03 | 2015-12-09 | Nxp B.V. | Radio frequency heating apparatus |
| CN105227183A (en) * | 2015-11-16 | 2016-01-06 | 中国电子科技集团公司第四十三研究所 | A kind of frequency agility rate source of low spurious |
| CN105423363A (en) * | 2016-01-06 | 2016-03-23 | 广东美的厨房电器制造有限公司 | Microwave source system, microwave oven and execution method in microwave source system |
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