CN113556187A - Frequency deviation calibration system of two-point modulation transmitter - Google Patents
Frequency deviation calibration system of two-point modulation transmitter Download PDFInfo
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- CN113556187A CN113556187A CN202110657164.1A CN202110657164A CN113556187A CN 113556187 A CN113556187 A CN 113556187A CN 202110657164 A CN202110657164 A CN 202110657164A CN 113556187 A CN113556187 A CN 113556187A
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Abstract
The invention discloses a frequency deviation calibration system of a two-point modulation transmitter, which is characterized by comprising a phase-locked loop circuit and a transmitting circuit; the phase-locked loop circuit includes: the multi-mode frequency divider is connected with the transmitting circuit; the voltage-controlled oscillator is connected with the multi-mode frequency divider; the transmission circuit includes: the input end of the in-band Gaussian filter is connected with the transmitting signal and receives the first gain parameter; a modulator for modulating the output signal and inputting the modulated signal to the multi-modulus frequency divider; a digital calibrator; an out-of-band gaussian filter receiving a second gain parameter; and the digital-to-analog converter changes the output voltage of the digital-to-analog converter according to the output signal of the out-of-band Gaussian filter. The invention has the beneficial effects that: by arranging the digital calibrator to calibrate the in-band Gaussian filter and the out-of-band Gaussian filter simultaneously, the defect of long calibration time caused by the fact that the two-point transmitter needs to calibrate two branches respectively in the prior art is overcome, the time required by calibration operation is reduced, and the working efficiency of the whole system is improved.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a frequency offset calibration system of a two-point modulation transmitter.
Background
In the field of wireless communication, automatic control of radio transmission frequency by a phase-locked loop circuit is a relatively common frequency stabilization method, and has wide application in a plurality of application scenarios. The frequency of the output signal can be acquired by arranging the phase-locked loop circuit, the output signal and the reference frequency are compared by the phase frequency detector, and the voltage-controlled oscillator is controlled according to the comparison result, so that the automatic control of the signal frequency in the wireless communication process is realized.
In the prior art, in the calibration process of the phase-locked loop circuit, two paths are often required to be set to respectively perform frequency offset adjustment on two branches of the phase-locked loop, and the frequency offset calibration is usually implemented by adjusting the programmable DAC device. As shown in fig. 1, the phase-locked loop circuit is composed of a phase frequency detector, a charge pump, a loop filter, and a voltage-controlled oscillator. When the phase-locked loop circuit needs to be subjected to frequency offset calibration, the switch S2 is opened, the switch S1 is closed, data 1 or data 0 are continuously sent through the transmitting circuit, the digital calibration module counts the transmitting frequency within a fixed time, and the data are recorded in the register. Then switch S1 is opened and switch S2 is closed, data 1 or data 0 is sent continuously to the other branch via the transmit circuit, the transmit frequency at that time is counted by the digital calibration module at the same fixed time and compared to the data recorded in the register of the previous branch. If the two branches are the same, the calibration is finished, namely the frequency offsets of the two branches are consistent; if not, the digital calibration module performs binary tree algorithm comparison to output the next controllable bit to change the voltage output value of the programmable DAC, and the steps are repeated until the counts of the two are equal and the frequencies are consistent, so that the calibration of the frequency offset of the two branches is completed. After the calibration is finished, the switch S1 and the switch S2 are closed, data transmission is started simultaneously, and then the power amplifier transmits the two paths of frequency modulation signals under the combined action through the antenna, so that the transmitting function of the two-point wireless transmitter is completed.
The problems with the above-described frequency offset calibration scheme include: a counter of the digital calibration module needs higher clock frequency, so that the overall power consumption of the digital calibration module is larger; meanwhile, when the two branches are counted, the switch S1 or the switch S2 needs to be disconnected or connected respectively, and the time is long.
Disclosure of Invention
In view of the above-mentioned problems in the prior art, a frequency offset calibration system for a two-point modulation transmitter is provided.
The specific technical scheme is as follows:
a frequency deviation calibration system of a two-point modulation transmitter comprises a phase-locked loop circuit and a transmitting circuit; the phase-locked loop circuit includes:
the multi-mode frequency divider is connected with the transmitting circuit;
the output end of the voltage-controlled oscillator is connected with the multi-mode frequency divider;
the transmission circuit includes:
the input end of the in-band Gaussian filter is controllably connected with the transmitting signal;
the in-band Gaussian filter receives a first gain parameter through a control end;
a modulator for modulating an output signal of the in-band Gaussian filter and inputting the modulated output signal to the multi-modulus frequency divider;
a digital calibrator connected to the in-band gaussian filter and the multi-modulus divider;
an out-of-band Gaussian filter controllably connected to the digital calibrator and the transmit signal and receiving a second gain parameter from the digital calibrator;
and the digital-to-analog converter is connected with the out-of-band Gaussian filter and the voltage-controlled oscillator and changes the output voltage of the digital-to-analog converter according to the output signal of the out-of-band Gaussian filter.
Preferably, the transmission circuit further includes:
a first switch disposed between an external input circuit and the in-band Gaussian filter;
a second switch disposed between the external input circuit and the out-of-band Gaussian filter;
a third switch disposed between the output of the digital calibrator and the input of the in-band gaussian filter;
and the fourth switch is arranged between the output end of the digital calibrator and the input end of the out-of-band Gaussian filter.
Preferably, the phase-locked loop circuit further includes:
the phase frequency detector is connected with the multi-mode frequency divider and receives the feedback frequency output by the multi-mode frequency divider;
the phase frequency detector also receives an external reference frequency;
the phase frequency detector compares the feedback frequency with the external reference frequency and controls the output frequency of the voltage-controlled oscillator;
the charge pump is connected with the output end of the phase frequency detector;
a loop filter connecting the charge pump and the voltage controlled oscillator;
and the power amplifier is connected with the output end of the voltage-controlled oscillator and is connected with an external output circuit.
Preferably, the digital calibrator sends first data to the voltage-controlled oscillator for a first time length through the out-of-band gaussian filter and the digital-to-analog converter, and then sends second data for the first time length, so as to obtain an out-of-band frequency offset parameter of the out-of-band gaussian filter;
and the digital calibrator simultaneously sends first data to the in-band Gaussian filter in a first time length, and then sends second data in the first time length to obtain the in-band frequency offset parameter of the in-band Gaussian filter.
Preferably, the voltage drop oscillator outputs a first signal to the multi-modulus divider according to the first data or the second data;
the multi-modulus frequency divider divides the frequency of the first signal and outputs a second signal to the digital calibrator;
and the digital calibrator respectively counts and subtracts a second signal generated according to the first data and a second signal generated according to the second data and processes the second signal to obtain the out-of-band frequency offset parameter.
Preferably, the in-band gaussian filter receives the first data and the second data and forwards to the digital calibrator;
and the digital calibrator calculates the in-band frequency offset parameter according to the first data and the second data forwarded by the in-band Gaussian filter.
Preferably, the digital calibrator compares the out-of-band frequency offset parameter with the in-band frequency offset parameter;
when the out-of-band frequency offset parameter and the in-band frequency offset parameter are equal, the calibration is finished, and a second gain parameter is stored in a register;
and when the out-of-band frequency offset parameter is not equal to the in-band frequency offset parameter, comparing by using a binary tree algorithm, outputting another second gain parameter to the out-of-band Gaussian filter, and calibrating again.
Preferably, the multi-modulus divider further outputs a clock signal to the digital calibrator after dividing the frequency of the output signal of the voltage-controlled oscillator.
Preferably, the digital calibrator further comprises means for extracting the second gain parameter from the register for adjusting the out-of-band gaussian filter when the digital calibrator is not operating.
The technical scheme has the following advantages or beneficial effects: by arranging the digital calibrator to calibrate the in-band Gaussian filter and the out-of-band Gaussian filter simultaneously, the defect of long calibration time caused by the fact that the two-point transmitter needs to calibrate two branches respectively in the prior art is overcome, the time required by calibration operation is reduced, and the working efficiency of the whole system is improved.
Drawings
Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings. The drawings are, however, to be regarded as illustrative and explanatory only and are not restrictive of the scope of the invention.
FIG. 1 is a general schematic diagram of the prior art;
FIG. 2 is an overall schematic diagram of an embodiment of the present invention;
FIG. 3 is a schematic diagram of an in-band gain signal according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an out-of-band gain signal according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating an overall gain signal according to an embodiment 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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The invention discloses a frequency offset calibration system of a two-point modulation transmitter, which comprises a phase-locked loop circuit 1 and a transmitting circuit 2, as shown in figure 2;
the phase-locked loop circuit 1 includes:
Further, the multi-modulus frequency divider 11 divides the output frequency of the voltage-controlled oscillator 15, and a clock signal can be output to the digital calibrator 23, so as to replace a clock circuit in the prior art, and simplify the circuit design.
The phase frequency detector 12 is connected with the multi-mode frequency divider 11 and an external reference circuit, receives a reference frequency input by the external reference circuit, and generates an adjusting signal for adjusting the voltage-controlled oscillator 15 by performing phase comparison between the reference frequency and a feedback frequency input by the multi-mode frequency divider 11;
the loop filter 14 is connected with the phase frequency detector 12 and is used for filtering high-frequency components generated by error voltage in the output signal of the phase frequency detector 12, so that the stability of the output signal is improved;
the input end of the voltage-controlled oscillator 15 is connected with the loop filter 14, the output end of the voltage-controlled oscillator 15 is connected with the multi-mode frequency divider 11, the voltage change of the signal input by the loop filter 14 is received through the input end to adjust the transmitting frequency, and the transmitting frequency is input into the multi-mode frequency divider 11 to provide the feedback frequency for the phase frequency detector 12, so that a closed-loop control system is formed.
Specifically, the above technical features as a whole can realize the automatic frequency control of the transmission signal, the frequency signal is output by the voltage-controlled oscillator 15 and divided by the multi-modulus divider 11, a feedback frequency is provided for the phase frequency detector 12, and the reference frequency and the feedback frequency are compared by the phase frequency detector 12, thereby realizing the automatic frequency control of the voltage-controlled oscillator.
The transmission circuit 2 includes:
the in-band Gaussian filter 22 is connected with the external control circuit, receives the first gain parameter and adjusts the voltage of the output signal according to the first gain parameter;
a digital calibrator 23 coupled to the in-band gaussian filter 22 and the multi-modulus divider 11 for generating a second gain signal for adjusting the gain of the out-of-band gaussian filter 24;
and the out-of-band Gaussian filter 24 is connected with the digital calibrator 23 and receives the second gain parameter sent by the digital calibrator 23, and adjusts the output voltage according to the second gain parameter so that the output gain of the in-band Gaussian filter 22 is the same as the output gain of the out-of-band Gaussian filter 24.
Specifically, the in-band gaussian filter 22 and the out-of-band gaussian filter 24 can be used to effectively process the transmission signal, so as to obtain a better transmission effect in the full frequency range.
In a preferred embodiment, the transmitting circuit 2 further comprises:
the digital-to-analog converter 25 is connected with the out-of-band Gaussian filter 24 and the voltage-controlled oscillator 15, and the gain value of the branch input voltage-controlled oscillator 15 can be effectively adjusted by adjusting the output voltage of the digital-to-analog converter 25;
a first switch S1 provided between the external input circuit and the in-band gaussian filter 22;
a second switch S2 provided between the external input circuit and the out-of-band gaussian filter 24;
a third switch S3 provided between the output of the digital calibrator 23 and the input of the in-band gaussian filter 22;
a fourth switch S4 arranged between the output of the digital calibrator 23 and the input of the out-of-band gaussian filter 24.
Specifically, by setting a plurality of switches, the branch of the input signal can be effectively selected, so that the digital calibrator 23 can conveniently calibrate the gain values of the in-band gaussian filter 22 and the out-of-band gaussian filter 24, the frequency offsets of the two paths of signals are equal, and a better emission effect is obtained.
Wherein: the first switch S1 and the second switch S2 are used for controlling the connection between the external input circuit and the transmitting circuit 2, and by disconnecting the first switch S1 and the second switch S2, the interference of the external input circuit to the transmitting circuit 2 can be avoided when the transmitting circuit 2 is calibrated, so that a better calibration effect is achieved;
the third switch S3 is used to control the connection between the digital calibrator 23 and the in-band gaussian filter 22, and the fourth switch S4 is used to control the connection between the digital calibrator 23 and the out-of-band gaussian filter 24, and when the transmitting circuit 2 completes the adjustment of the second gain parameter, the third switch S3 and the fourth switch S4 can be turned off, thereby avoiding the voltage division and crosstalk caused by the digital calibrator 23 during the transmitting process.
In a preferred embodiment, the phase-locked loop circuit 1 further comprises:
a charge pump 13 disposed between the phase frequency detector 12 and the loop filter 14, for performing voltage amplification on an output signal of the phase frequency detector 12;
the power amplifier 16 is connected to the output end of the voltage-controlled oscillator 15 and to an external output circuit, and can effectively increase the transmission power of the wireless communication system by performing undistorted power amplification on the transmission signal output by the voltage-controlled oscillator 15, thereby obtaining a higher transmission signal-to-noise ratio and a longer transmission distance.
In a preferred embodiment, the digital calibrator 23 sends the first data with a first time duration T1 and then sends the second data with a first time duration T1 to the vco 15 through the out-of-band gaussian filter 24 and the digital-to-analog converter 25, so as to obtain the out-of-band frequency offset parameter of the out-of-band gaussian filter 24;
the digital calibrator 23 also sends the first data to the in-band gaussian filter 22 for a first time duration T1 and sends the second data for a first time duration T1 to obtain the in-band frequency offset parameter of the in-band gaussian filter 22.
In a preferred embodiment, the voltage drop oscillator 15 outputs a first signal to the multi-modulus divider 11 based on the first data or the second data;
the multi-modulus frequency divider 11 divides the frequency of the first signal and outputs a second signal to the digital calibrator 23;
the digital calibrator 23 counts and subtracts the second signal generated according to the first data and the second signal generated according to the second data, and processes the signals to obtain the out-of-band frequency offset parameter.
Specifically, the digital calibrator 23 sends first data with a first time length T1, the out-of-band gaussian filter 24 processes the first data and sends the first data to the digital-to-analog converter 25, the digital-to-analog converter 25 processes the signal and forwards the signal to the voltage-controlled oscillator 15, the frequency output end of the voltage-controlled oscillator 15 outputs a frequency signal Fvco to the multi-modulus frequency divider 11, and the multi-modulus frequency divider 11 divides the frequency of the Fvco to obtain an Fcmp-1 signal and sends the Fcmp-1 signal to the digital calibrator 23. After the above-mentioned procedure is repeated, the digital calibrator can obtain Fcmp-2 signal generated according to the second data processing and frequency division, and the out-of-band frequency offset parameter can be obtained by counting and subtracting the Fcmp-1 signal and the Fcmp-2 signal.
In a preferred embodiment, the in-band gaussian filter 22 receives the first data and the second data and forwards them to the digital calibrator 23;
the digital calibrator 23 calculates the in-band frequency offset parameter according to the first data and the second data forwarded by the in-band gaussian filter 22.
Specifically, the switch S3 is closed, the switch S1 is opened to exclude the interference of the external input circuit to the in-band gaussian filter 22, the in-band gaussian filter 22 is set to operate under the first gain parameter, the digital calibrator sends first data of a first time length T1 to the in-band gaussian filter 22, and then sends second data to the in-band gaussian filter 22 with the first time length T1, the in-band gaussian filter 22 receives the first data of the first time length T1, processes and forwards the first data back to the digital calibrator 23, the in-band gaussian filter 22 receives the second data of the first time length T1, processes and forwards the second data back to the digital calibrator 23, and the digital calibrator can obtain the in-band parameter frequency offset through calculation.
In a preferred embodiment, the digital calibrator 23 compares the out-of-band frequency offset parameter with the in-band frequency offset parameter, and obtains the actual output voltages of the in-band transmitting branch and the out-of-band transmitting branch by comparing the out-of-band frequency offset parameter with the in-band frequency offset parameter, so as to facilitate the subsequent balance adjustment of the actual output voltages of the in-band transmitting branch and the out-of-band transmitting branch;
when the out-band frequency offset parameter and the in-band frequency offset parameter are equal, the calibration is finished, and the second gain parameter is stored in the register;
and when the out-of-band frequency offset parameter and the in-band frequency offset parameter are not equal, comparing by using a binary tree algorithm, outputting another second gain parameter to the out-of-band Gaussian filter, and calibrating again.
Specifically, the in-band gain is shown in fig. 3, the out-band gain is shown in fig. 4, and the finally obtained total gain is shown in fig. 5, and the digital calibrator 23 compares the out-band frequency offset parameter and the in-band frequency offset parameter to determine whether the gains of the two paths of transmission signals sent by the out-band transmission branch and the in-band transmission branch to the phase-locked loop circuit 1 are the same, and when the gains of the two paths of transmission signals are different, the gain parameter of the gaussian filter needs to be adjusted to balance the gains of the two paths of transmission signals.
Furthermore, in the technical scheme, the in-band emission branch has a low-pass characteristic, the out-of-band emission branch has a high-pass characteristic, and after the frequency offset calibration process, the in-band emission branch and the out-of-band emission branch send signals simultaneously, so that the overall transmission curve of the system can be flat in a larger frequency range, and various communication rates can be effectively supported.
In a preferred embodiment, the second gain parameter of the out-of-band gaussian filter 24 is adjusted by setting the first gain parameter of the in-band gaussian filter 22 to a fixed value, thereby achieving a better gain balance.
In a preferred embodiment, generating the second gain parameter for calibration by a binary tree algorithm enables faster search speeds.
In a preferred embodiment, the multi-modulus divider 11 divides the frequency of the output signal of the vco 15 and outputs a clock signal to the digital calibrator 23 for the digital calibrator 23 to time and count the received signals.
Specifically, by setting the multi-modulus frequency divider 11 to divide the output signal of the voltage-controlled oscillator 15 to generate the clock signal, the defect that the digital calibrator 23 needs to use a clock circuit with a higher frequency in the prior art can be effectively avoided.
In a preferred embodiment, digital calibrator 23 further comprises a second gain parameter extracted from a register for adjusting out-of-band gaussian filter 22 when digital calibrator 23 is not in operation.
Specifically, by setting the register in the digital calibrator 23, the current transmission frequency and the corresponding second gain parameter can be recorded, and when the next transmission is performed, if the transmission frequency is consistent with the frequency of the current transmission, the second gain parameter is extracted from the register, so that the calibration time for the in-band transmission branch and the out-of-band transmission branch can be effectively shortened.
The invention has the beneficial effects that: by arranging the digital calibrator to calibrate the in-band Gaussian filter and the out-of-band Gaussian filter simultaneously, the defect of long calibration time caused by the fact that the two-point transmitter needs to calibrate two branches respectively in the prior art is overcome, the time required by calibration operation is reduced, and the working efficiency of the whole system is improved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A frequency deviation calibration system of a two-point modulation transmitter is characterized by comprising a phase-locked loop circuit and a transmitting circuit; the phase-locked loop circuit includes:
the multi-mode frequency divider is connected with the transmitting circuit;
the output end of the voltage-controlled oscillator is connected with the multi-mode frequency divider;
the transmission circuit includes:
the input end of the in-band Gaussian filter is controllably connected with the transmitting signal;
the in-band Gaussian filter receives a first gain parameter through a control end;
a modulator for modulating an output signal of the in-band Gaussian filter and inputting the modulated output signal to the multi-modulus frequency divider;
a digital calibrator connected to the in-band gaussian filter and the multi-modulus divider;
an out-of-band Gaussian filter controllably connected to the digital calibrator and the transmit signal and receiving a second gain parameter from the digital calibrator;
and the digital-to-analog converter is connected with the out-of-band Gaussian filter and the voltage-controlled oscillator and changes the output voltage of the digital-to-analog converter according to the output signal of the out-of-band Gaussian filter.
2. The frequency offset calibration system of claim 1, wherein said transmit circuit further comprises:
a first switch disposed between an external input circuit and the in-band Gaussian filter;
a second switch disposed between the external input circuit and the out-of-band Gaussian filter;
a third switch disposed between the output of the digital calibrator and the input of the in-band gaussian filter;
and the fourth switch is arranged between the output end of the digital calibrator and the input end of the out-of-band Gaussian filter.
3. The frequency offset calibration system of claim 2, wherein said phase locked loop circuit further comprises:
the phase frequency detector is connected with the multi-mode frequency divider and receives the feedback frequency output by the multi-mode frequency divider;
the phase frequency detector also receives an external reference frequency;
the phase frequency detector compares the feedback frequency with the external reference frequency and controls the output frequency of the voltage-controlled oscillator;
the charge pump is connected with the output end of the phase frequency detector;
a loop filter connecting the charge pump and the voltage controlled oscillator;
and the power amplifier is connected with the output end of the voltage-controlled oscillator and is connected with an external output circuit.
4. The frequency offset calibration system of claim 3, wherein said digital calibrator sends first data to said voltage controlled oscillator via said out-of-band gaussian filter and said digital-to-analog converter for a first duration of time, and then sends second data for said first duration of time, for obtaining out-of-band frequency offset parameters of said out-of-band gaussian filter;
and the digital calibrator simultaneously sends first data to the in-band Gaussian filter in a first time length, and then sends second data in the first time length to obtain the in-band frequency offset parameter of the in-band Gaussian filter.
5. The frequency offset calibration system of claim 4, wherein said droop oscillator outputs a first signal to said multi-modulus divider based on said first data or said second data;
the multi-modulus frequency divider divides the frequency of the first signal and outputs a second signal to the digital calibrator;
and the digital calibrator respectively counts and subtracts a second signal generated according to the first data and a second signal generated according to the second data and processes the second signal to obtain the out-of-band frequency offset parameter.
6. The frequency offset calibration system of claim 4 wherein said in-band Gaussian filter receives said first data and said second data and forwards to said digital calibrator;
and the digital calibrator calculates the in-band frequency offset parameter according to the first data and the second data forwarded by the in-band Gaussian filter.
7. The frequency offset calibration system of claim 4, wherein said digital calibrator compares said out-of-band frequency offset parameter to said in-band frequency offset parameter;
when the out-of-band frequency offset parameter and the in-band frequency offset parameter are equal, the calibration is finished, and the second gain parameter is stored in a register;
and when the out-of-band frequency offset parameter is not equal to the in-band frequency offset parameter, comparing by using a binary tree algorithm, outputting another second gain parameter to the out-of-band Gaussian filter, and calibrating again.
8. The frequency offset calibration system of claim 5, wherein said multi-modulus divider divides the output signal of said voltage controlled oscillator and outputs a clock signal to said digital calibrator.
9. The frequency offset calibration system of claim 7 wherein said digital calibrator further comprises means for extracting said second gain parameter from said register for adjusting said out-of-band gaussian filter when said digital calibrator is not operating.
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| CN113810048A (en) * | 2021-11-18 | 2021-12-17 | 深圳百瑞互联技术有限公司 | Phase-locked loop two-point modulation circuit with gain correction, transmitter and correction method |
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