CN113900084B - Crystal-oscillator-free FMCW radar transceiver system and frequency calibration method - Google Patents
Crystal-oscillator-free FMCW radar transceiver system and frequency calibration method Download PDFInfo
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- CN113900084B CN113900084B CN202111039544.5A CN202111039544A CN113900084B CN 113900084 B CN113900084 B CN 113900084B CN 202111039544 A CN202111039544 A CN 202111039544A CN 113900084 B CN113900084 B CN 113900084B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
- G01S7/4056—Means for monitoring or calibrating by simulation of echoes specially adapted to FMCW
Abstract
The invention discloses a crystal-oscillator-free FMCW radar transceiver system and a frequency calibration method, and relates to the technical field of wireless transceiving.
Description
Technical Field
The invention relates to the technical field of wireless transceiving, in particular to a crystal-oscillator-free FMCW radar transceiver system and a frequency calibration method.
Background
With the updating of the process technology, the radar has the inherent advantages in the smart home product by virtue of the advantages of strong anti-interference performance, good installation secrecy, no privacy disclosure and the like. However, consumer electronics are price sensitive, small in size and low in cost, which are the key to the technical solution. The chip packaging size can be reduced while the cost is reduced by omitting an off-chip crystal oscillator, but in order to comply with the spectrum emission rules of European telecommunication standardization institute, Federal communications Commission in the United states and the like, an FMCW (Frequency Modulated Continuous Wave) radar transceiver system has requirements on the accuracy of output Frequency, if the crystal oscillator is omitted as a Frequency reference, the output Frequency of a radar needs to be calibrated, and a proper Frequency drift compensation strategy is adopted to meet the design requirements of the radar system.
In the related art, a digital-to-analog converter and a voltage-controlled oscillator are adopted to realize frequency modulation, and the required frequency precision is achieved by adopting a temperature drift standard and a power supply ripple resistant design, but the structure cannot meet the linear frequency modulation requirement of the frequency modulation continuous wave radar. In addition, frequency modulation is also realized by adopting an oscillator and a phase-locked loop, and the process deviation acquisition of frequency is realized by adopting a receiver and a digital processing circuit of a wireless transceiving system, but in the test process of the scheme, an external target frequency signal source is needed, the radio frequency front end is configured into a calibration mode, then the output of a frequency synthesizer is continuously adjusted, and a receiver searching signal is utilized to acquire the frequency deviation, so that the whole calibration system is complex in design, and the calibration cost is increased.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a crystal-oscillator-free FMCW radar transceiver system and a frequency calibration method, which can perform frequency calibration and drift compensation on an oscillator, provide high-precision frequency output, have simple system design and can effectively reduce the cost.
The crystal-free FMCW radar transceiver system comprises an oscillator module with calibration, an FMCW frequency synthesizer and a transceiver module, wherein the oscillator module with calibration comprises an oscillator, an automatic frequency correction module and a register, the automatic frequency correction module is connected with the oscillator, and the automatic frequency correction module is also connected with the register; the FMCW frequency synthesizer comprises a radio frequency phase-locked loop and a chirp signal generator, wherein a first input end of the radio frequency phase-locked loop is connected with an output end of the oscillator, and the chirp signal generator is connected with a second input end of the radio frequency phase-locked loop and is used for generating an FMCW chirp signal; the receiving and sending module is further connected with an antenna, the output end of the radio frequency phase-locked loop sends signals to the antenna through the transmitting channel of the receiving and sending module, and the receiving channel of the receiving and sending module receives the signals through the antenna.
The crystal-free FMCW radar transceiver system provided by the embodiment of the invention has at least the following beneficial effects: through digital-to-analog converter, automatic frequency correction module and register, can realize the calibration to oscillator output frequency, and under the effect of temperature compensation module, can provide the compensation of frequency drift for the oscillator, the modulation of frequency is realized through the mode of oscillator and radio frequency phase-locked loop to no crystal oscillator FMCW radar transceiver system, need not extra receiving channel and obtains the frequency deviation, can reduce the module of participating in the calibration, thereby simplify the flow and the circuit of calibration, can reduce the cost of calibration test.
According to some embodiments of the present invention, the apparatus further comprises a digital-to-analog converter and a temperature compensation module, wherein the temperature compensation module is connected to an input end of the oscillator, an input end of the digital-to-analog converter is connected to an output end of the automatic frequency correction module, and an output end of the digital-to-analog converter is connected to an input end of the oscillator.
According to some embodiments of the invention, the outputs of the digital-to-analog converter and the temperature compensation module may be input to the oscillator through a combining module.
According to some embodiments of the present invention, a plurality of vcfs or a plurality of sets of switch capacitor arrays are disposed in the oscillator, and outputs of the digital-to-analog converter and the temperature compensation module can be further input to the oscillator through different vcfs or different switch capacitor arrays.
According to some embodiments of the present invention, the automatic frequency correction module comprises a successive approximation shift register, a module register and a data selector, wherein a first output terminal of the successive approximation shift register is connected to a first input terminal of the data selector, an input terminal of the module register is connected to a second output terminal of the successive approximation shift register, an output terminal of the module register is connected to a second input terminal of the data selector, and the module register is further connected to the register.
According to some embodiments of the present invention, the transceiver module comprises a power amplifier, a low noise amplifier, a mixer and an analog-to-digital converter, which are connected in sequence, and the input terminal of the power amplifier is further connected to the first input terminal of the mixer.
The frequency calibration method according to the embodiment of the second aspect of the invention comprises the following steps:
accessing a frequency measuring device and setting a target frequency;
controlling an automatic frequency correction module to search a frequency coarse calibration code in a binary mode;
controlling the output frequency of an oscillator to approach the target frequency according to the frequency coarse calibration code;
when the output frequency is approached, writing a first calibration result into a register;
The frequency calibration method provided by the embodiment of the invention has at least the following beneficial effects:
the automatic frequency correction module inputs the frequency coarse calibration code into the oscillator, so that the output frequency of the oscillator is controlled to approach the target frequency, the output frequency is adjusted, the system can output high-precision frequency output, and meanwhile, the first calibration result is written into the register, so that convenience is brought to subsequent normal use work of the system.
According to some embodiments of the invention, further comprising:
controlling the automatic frequency correction module to search frequency fine calibration codes in a binary mode;
controlling a digital-to-analog converter to generate frequency fine adjustment voltage according to the frequency fine calibration code;
writing a second calibration result to the register.
According to some embodiments of the invention, writing the first calibration result into the register when the output frequency is approaching comprises:
and writing a first calibration result into the register when the output frequency is within the allowable deviation range of the target frequency.
A radio detection, sensing and ranging system according to an embodiment of the third aspect of the invention comprises a crystal oscillator-free FMCW radar transceiver system as described in an embodiment of the first aspect.
The radio detection, sensing and ranging system provided by the embodiment of the invention at least has the following beneficial effects: the crystal-oscillator-free FMCW radar transceiver system can provide high-precision and high-linearity frequency modulation for the system, achieves high-precision signal transmission, and provides convenience for detection, perception and ranging of the system.
An integrated chip according to an embodiment of the fourth aspect of the present invention comprises the crystal-oscillator-free FMCW radar transceiver system as described in the embodiment of the first aspect.
The integrated chip according to the embodiment of the invention has at least the following beneficial effects: the pin count of the integrated chip is reduced, so that the chip package can be smaller, the size of the integrated chip is reduced, and the cost is reduced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a crystal oscillator-less FMCW radar transceiver system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a crystal oscillator-less FMCW radar transceiver system in accordance with another embodiment of the present invention;
FIG. 3 is a diagram of an automatic frequency correction module according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating steps of a frequency calibration method according to an embodiment of the invention;
fig. 5 is a flowchart illustrating a frequency calibration method according to another embodiment of the invention.
Reference numerals:
an oscillator module 100 with calibration, an oscillator 110, an automatic frequency correction module 120, a successive approximation shift register 121, a module register 122, a data selector 123, a register 130, a temperature compensation module 140, a digital-to-analog converter 150, and a combining module 160; an FMCW frequency synthesizer 200, a radio frequency phase-locked loop 210, a chirp signal generator 220; a transceiver module 300, a power amplifier 310, a low noise amplifier 320, a mixer 330, and an analog-to-digital converter 340; an antenna 400.
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 numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise specifically limited, terms such as set, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention by combining the specific contents of the technical solutions.
The crystal-oscillator-free FMCW radar transmitting and receiving system comprises an oscillator module 100 with calibration, an FMCW frequency synthesizer 200 and a transmitting and receiving module 300 which are connected in sequence, wherein the output of the oscillator module 100 with calibration is used as the input of the FMCW frequency synthesizer 200 and is finally transmitted through the transmitting and receiving module 300, and through the oscillator module 100 with calibration and the FMCW frequency synthesizer 200, the frequency linear modulation can be realized, the frequency of the oscillator 110 can be directly calibrated, a receiving channel is not required to participate in the calibration process, and the calibration flow and the circuit design are simplified.
Specifically, referring to fig. 1, an oscillator module 100 with calibration in a crystal-less FMCW radar transceiver system includes an oscillator 110, an automatic frequency correction module 120, and a register 130. The afc module 120 is connected to the oscillator 110, and the afc module 120 is further connected to the register 130, that is, the afc module 120 is respectively connected to the register 130 and the oscillator 110, the afc module 120 can perform a read/write operation with the register 130, that is, the afc module 120 can read binary digital codes from the register 130, and can also write the binary digital codes into the register 130, in addition, the afc module 120 is further connected to the oscillator 110, and the afc module 120 can input the binary digital codes into the oscillator 110. It is contemplated that the input to the oscillator 110 may be an analog voltage or may be a digital code input. It should be noted that the oscillator 110 does not have a quartz crystal, and the oscillator 110 may be a voltage controlled oscillator or a numerical controlled oscillator.
The FMCW frequency synthesizer 200 includes a rf phase-locked loop 210 and a chirp signal generator 220, wherein a first input end of the rf phase-locked loop 210 is connected to an output end of the oscillator 110, an output end of the rf phase-locked loop 210 is connected to the transceiver module 300, and the chirp signal generator 220 is connected to a second input end of the rf phase-locked loop 210 and is configured to generate an FMCW chirp signal, it is understood that the chirp signal generator 220 is configured to generate the FMCW chirp signal and input the FMCW chirp signal into the rf phase-locked loop 210, so that the rf phase-locked loop 210 performs frequency modulation, that is, the chirp signal increases a transmission bandwidth of the signal by modulating a carrier frequency, and meanwhile, the chirp signal has a high distance resolution, and can perform an effect of distinguishing interference from a target, and improve an anti-interference capability.
The transceiver module 300 is connected to the antenna 400, the output end of the rf pll 210 transmits signals to the antenna 400 through the transmission channel of the transceiver module 300, and the reception channel of the transceiver module 300 receives signals through the antenna 400.
Under the action of the afc module 120 and the register 130, the calibration of the output frequency of the oscillator 110 can be realized, and the crystal-less FMCW radar transceiver system can realize the frequency modulation through the oscillator 110 and the rf phase-locked loop 210, and the number of modules participating in the calibration can be reduced without acquiring frequency deviation through an additional receiving channel, thereby simplifying the calibration process and circuit, and reducing the calibration test cost.
Referring to fig. 2, in some embodiments of the invention, the system further includes a digital-to-analog converter 150 and a temperature compensation module 140. The output end of the digital-to-analog converter 150 is connected with the input end of the oscillator 110, that is, the output of the digital-to-analog converter 150 can enter the oscillator 110, and the natural frequency deviation of the oscillator 110 is adjusted; the input end of the digital-to-analog converter 150 is connected to the automatic frequency correction module 120, and it can be understood that the automatic frequency correction module 120 reads the calibration information from the register 130, and then configures the calibration information into the digital-to-analog converter 150, so that the digital-to-analog converter 150 outputs the frequency fine adjustment voltage to complete the fine adjustment of the natural frequency deviation of the oscillator 110, thereby improving the accuracy of the system output.
The temperature compensation module 140 is connected to the oscillator 110, and the temperature compensation module 140 is configured to monitor a temperature change and generate a compensation voltage for compensating a drift of a frequency of the oscillator 110 with the temperature change.
Referring to fig. 3, in some embodiments of the present invention, the afc module 120 includes a successive approximation shift register 121, a module register 122, and a data selector 123. The first output end of the successive approximation shift register 121 is connected to the first input end of the data selector 123, the input end of the module register 122 is connected to the second output end of the successive approximation shift register 121, the output end of the module register 122 is connected to the second input end of the data selector 123, the module register 122 is further connected to the register 130, i.e., a digital code can be read from the register 130 or written into the register 130, the output end of the data selector 123 is connected to the oscillator 110, and the data selector 123 selects one of the two inputs and sends out the other input.
For example, in the calibration process, the data selector 123 outputs the digital code at the first input end, that is, the digital code output by the successive approximation shift register 121 is input into the oscillator 110, and after the calibration is finished, the output of the successive approximation shift register 121 may also be transmitted to the register 130 through the module register 122, so as to be called during normal operation; during normal operation of the system, the data selector 123 outputs the digital code at the second input end, that is, the output of the module register 122 is input to the oscillator 110, and the module register 122 reads the calibration code from the register 130, and then sends the calibration code to the oscillator 110 and the digital-to-analog converter 150 through the data selector 123. The automatic frequency correction module 120 performs selection of an output through the data selector 123, thereby adjusting the output of the oscillator 110 so that the oscillator 110 outputs a high-precision frequency.
Referring to fig. 2, in some embodiments of the present invention, the outputs of the digital-to-analog converter 150 and the temperature compensation module 140 may be input to the oscillator 110 through a combining module 160, and the combining module 160 is configured to combine the outputs of the digital-to-analog converter 150 and the temperature compensation module 140 and input the combined output to the oscillator 110. The combining module 160 may adopt an adder or an in-phase addition operation circuit. The outputs of the digital-to-analog converter 150 and the temperature compensation module 140 are combined and input into the oscillator 110, so as to realize temperature change compensation and frequency offset adjustment on the oscillator 110, thereby achieving the effect of fine tuning and ensuring high output frequency precision of the oscillator 110.
In some embodiments of the present invention, multiple vcmps or multiple switch capacitor arrays are disposed in the oscillator 110. The oscillator 110 may be a voltage controlled oscillator (vco) that can implement voltage-to-frequency modulation by adjusting a bias voltage of a varactor, or a digital controlled oscillator (dco) that can implement digital code-to-frequency modulation by adjusting a switch state of a switch capacitor array. If there are two signals input to the oscillator 110, two vcvs or two sets of switched capacitors may be used to input the signals. For example, the oscillator 110 is a voltage-controlled oscillator, and the outputs of the temperature compensation module 140 and the digital-to-analog converter 150 are directly connected to two different voltage-controlled capacitors in the oscillator 110; the oscillator 110 is a digital controlled oscillator, and the outputs of the temperature compensation module 140 and the digital-to-analog converter 150 are directly connected to two different sets of switched capacitor arrays in the oscillator 110, so that the outputs of the temperature compensation module 140 and the digital-to-analog converter 150 are directly input to the oscillator 110.
Referring to fig. 2, in some embodiments of the present invention, the transceiver module 300 includes a power amplifier 310, a low noise amplifier 320, a mixer 330, and an analog-to-digital converter 340, which are connected in sequence, it can be understood that an input end of the power amplifier 310 is connected to the FMCW frequency synthesizer 200 as an input end of the transceiver module 300, an output end of the power amplifier 310 is connected to an input end of the low noise amplifier 320, an output end of the power amplifier 310 is further connected to an antenna 400, that is, the power amplifier 310 is used as a transmission channel of the transceiver module 300, and then a signal input to the transceiver module 300 passes through the power amplifier 310 and is then transmitted by the antenna 400. The low noise amplifier 320, the mixer 330 and the analog-to-digital converter 340 are used as a receiving channel of the transceiver module 300, the antenna 400 is connected to an input end of the low noise amplifier 320, a first input end of the mixer 330 is connected to an output end of the low noise amplifier 320, a second input end of the mixer 330 is connected to an input end of the power amplifier 310, an output end of the mixer 330 is connected to an input end of the analog-to-digital converter 340, and the analog-to-digital converter 340 outputs a baseband signal to implement demodulation and recover a received signal.
Referring to fig. 4, in some embodiments of the present invention, a frequency calibration method includes at least the following steps:
step S110: accessing a frequency measuring device and setting a target frequency;
step S120: controlling an automatic frequency correction module to search a frequency coarse calibration code in a binary mode;
step S130: controlling the output frequency of an oscillator to approach the target frequency according to the frequency coarse calibration code;
step S140: when the output frequency is close to the output frequency, the first calibration result is written into the register.
It can be understood that, for a system with low accuracy requirement, in the system testing process, a testing interface may be provided at the output end of the oscillator 110 or the antenna 400, and a frequency measurement device is externally connected to the testing interface, and a target frequency is set at the same time, so as to detect the accuracy of the system output frequency according to whether the system output can reach the target frequency. The afc module 120 is controlled to search for the coarse frequency calibration code and control the output frequency of the oscillator 110 according to the searched coarse frequency calibration code, i.e. the afc module 120 configures the oscillator 110 according to the coarse frequency calibration code so that the output frequency of the oscillator 110 approaches the target frequency.
When the output frequency approaches, that is, the output frequency approaches the target frequency, it can be understood that the output frequency is considered to approach within a certain range of the target frequency, and the coarse adjustment of the output frequency of the oscillator 110 is achieved, and the first calibration result is written into the register 130, so that the system can be called when the system works normally. Wherein the first calibration result comprises a frequency coarse calibration code which realizes the completion of the approximation.
Referring to fig. 5, in some embodiments of the present invention, the frequency calibration method at least includes the following steps:
step S110: accessing a frequency measuring device and setting a target frequency;
step S120: controlling an automatic frequency correction module to search a frequency coarse calibration code in a binary mode;
step S130: controlling the output frequency of an oscillator to approach the target frequency according to the frequency coarse calibration code;
step S140: when the output frequency is approached, writing the first calibration result into a register;
step S150: controlling an automatic frequency correction module to search a frequency fine calibration code in a binary mode;
step S160: controlling a digital converter to generate a fine tuning voltage according to the frequency fine calibration code;
step S170: writing the second calibration result to the register.
It can be understood that, for a system with a high requirement on precision, in the system testing process, a testing interface may be provided at the output end of the oscillator 110 or the antenna 400, and a frequency measurement device is externally connected to the testing interface, and a target frequency is set at the same time, so as to detect the precision of the system output frequency according to whether the system output can reach the target frequency. The afc module 120 is controlled to search for the coarse frequency calibration code and control the output frequency of the oscillator 110 according to the searched coarse frequency calibration code, i.e. the afc module 120 configures the oscillator 110 according to the coarse frequency calibration code so that the output frequency of the oscillator 110 approaches the target frequency.
When the output frequency approaches the target frequency, it can be understood that the output frequency approaches the target frequency within a certain range, and the coarse adjustment of the output frequency of the oscillator 110 is achieved, the first calibration result is written into the register 130, so as to be called when the system works normally. Wherein the first calibration result comprises a coarse frequency calibration code for achieving the approach completion.
The afc 120 is further controlled to search for the frequency fine calibration code, and the dac 150 is controlled to generate the frequency fine tuning voltage according to the searched frequency fine calibration code, that is, the afc 120 inputs the obtained frequency fine calibration code to the dac 150, so that the dac 150 outputs a frequency fine tuning voltage, and further inputs the frequency fine tuning voltage to the oscillator 110, thereby achieving fine tuning of the output frequency of the oscillator 110. In addition, the second calibration result is written into the register 130 for being called when the system is working normally. Wherein the second calibration result comprises a frequency fine calibration code.
The output frequency is adjusted by coarse adjustment and fine adjustment, so that the system can output a high-precision frequency output, and meanwhile, the first calibration result and the second calibration result are written into the register 130, so that convenience can be provided for subsequent normal use work of the system.
It should be noted that, the manner of searching the frequency coarse calibration code and the frequency fine calibration code by the afc module 120 is binary search. The binary search mode can improve the search efficiency, thereby improving the speed of coarse adjustment and fine adjustment.
In some embodiments of the present invention, the output frequency is within an allowable deviation range of the target frequency, i.e. the approximation is considered to be completed, it is contemplated that, in the coarse tuning stage of the output frequency of the oscillator 110, the output frequency of the oscillator 110 may approach the target frequency, the allowable deviation range is ± 1% of the target frequency, and when the output frequency enters the allowable deviation range, the first calibration result is written into the register 130. It should be noted that the allowable deviation range can be enlarged or reduced according to the design requirements of the system.
In some embodiments of the present invention, a radio detection, sensing and ranging system is further provided, where the system includes a crystal-oscillator-free FMCW radar transceiver system in the implementation of the present invention, and the crystal-oscillator-free FMCW radar transceiver system can provide high-precision and high-linearity frequency modulation for the radio detection, sensing and ranging system, so as to implement transmission of high-precision signals, and facilitate detection, sensing and ranging of the system.
In some embodiments of the present invention, an integrated chip is further provided, where the integrated chip includes the crystal oscillator-free FMCW radar transceiver system in the embodiments of the present invention, an external crystal oscillator is omitted, and the pin count of the integrated chip can be reduced, so that the chip package can be smaller, and thus the size of the integrated chip is reduced and the cost is reduced.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (9)
1. A crystal oscillator-free FMCW radar transceiver system, comprising:
the oscillator module with calibration comprises an oscillator, an automatic frequency correction module and a register, wherein the automatic frequency correction module is connected with the oscillator and is also connected with the register;
the FMCW frequency synthesizer comprises a radio frequency phase-locked loop and a chirp signal generator, wherein a first input end of the radio frequency phase-locked loop is connected with an output end of the oscillator, and the chirp signal generator is connected with a second input end of the radio frequency phase-locked loop and is used for generating FMCW linear frequency modulation signals;
The receiving and sending module is connected with an antenna, the output end of the radio frequency phase-locked loop sends a signal to the antenna through a transmitting channel of the receiving and sending module, and a receiving channel of the receiving and sending module receives the signal through the antenna;
wherein, the first and the second end of the pipe are connected with each other,
connecting the output end of the oscillator or the antenna to frequency measurement equipment and setting a target frequency;
controlling the automatic frequency correction module to search a frequency coarse calibration code in a binary mode;
controlling the output frequency of the oscillator to approach the target frequency according to the frequency coarse calibration code;
when the output frequency is approached, the automatic frequency correction module writes a first calibration result into the register;
controlling the automatic frequency correction module to search a frequency fine calibration code in a binary mode;
controlling a digital-to-analog converter to generate frequency fine adjustment voltage according to the frequency fine calibration code;
writing a second calibration result to the register;
the automatic frequency correction module comprises a successive approximation shift register, a module register and a data selector, wherein a first output end of the successive approximation shift register is connected with a first input end of the data selector, an input end of the module register is connected with a second output end of the successive approximation shift register, an output end of the module register is connected with a second input end of the data selector, and the module register is further connected with the register.
2. The crystal-less FMCW radar transceiver system of claim 1 further comprising a temperature compensation module coupled to an input of the oscillator and a digital-to-analog converter having an input coupled to an output of the AFC module and an output coupled to an input of the oscillator.
3. The crystal-less FMCW radar transceiver system of claim 2, wherein outputs of the digital-to-analog converter and the temperature compensation module are input to the oscillator through a combining module.
4. The crystal-less FMCW radar transceiver system of claim 2, wherein the oscillator has a plurality of VCMs or arrays of switched capacitors disposed therein, and wherein outputs of the DAC and the temperature compensation module are input to the oscillator via different VCMs or different arrays of switched capacitors.
5. The crystal-less FMCW radar transceiver system of claim 1 or 2, wherein the transceiver module includes a power amplifier, a low noise amplifier, a mixer, and an analog-to-digital converter connected in series, wherein an input of the power amplifier is further connected to a first input of the mixer.
6. A method of frequency calibration, comprising:
accessing a frequency measuring device and setting a target frequency;
controlling an automatic frequency correction module to search a frequency coarse calibration code in a binary mode;
controlling the output frequency of an oscillator to approach the target frequency according to the frequency coarse calibration code;
when the output frequency is approached, writing a first calibration result into a register;
controlling the automatic frequency correction module to search frequency fine calibration codes in a binary mode;
controlling a digital-to-analog converter to generate frequency fine adjustment voltage according to the frequency fine calibration code;
writing a second calibration result to the register;
the automatic frequency correction module comprises a successive approximation shift register, a module register and a data selector, wherein a first output end of the successive approximation shift register is connected with a first input end of the data selector, an input end of the module register is connected with a second output end of the successive approximation shift register, an output end of the module register is connected with a second input end of the data selector, and the module register is further connected with the register.
7. The method according to claim 6, wherein writing a first calibration result into the register when the output frequency is approaching comprises:
And writing a first calibration result into the register when the output frequency is within the allowable deviation range of the target frequency.
8. A radio detection, sensing and ranging system comprising the crystal oscillator-free FMCW radar transceiver system of any one of claims 1 to 5.
9. An integrated chip comprising the crystal oscillator-less FMCW radar transceiver system of any one of claims 1 through 5.
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