CN111431556A - Transceiver with calibration function - Google Patents
Transceiver with calibration function Download PDFInfo
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- CN111431556A CN111431556A CN202010522978.XA CN202010522978A CN111431556A CN 111431556 A CN111431556 A CN 111431556A CN 202010522978 A CN202010522978 A CN 202010522978A CN 111431556 A CN111431556 A CN 111431556A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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Abstract
The application discloses a transceiver with a calibration function, which comprises a chip and a calibration circuit arranged on the chip, wherein the calibration circuit comprises a first analog-to-digital converter, a first digital-to-analog converter and a digital circuit; the input end of the first analog-to-digital converter is connected with the transmitting end of the chip, and the output end of the first analog-to-digital converter is connected with the input end of the digital circuit and used for converting the received radio frequency signal into a digital signal and sending the digital signal to the digital circuit; the output end of the digital circuit is connected with the input end of the first digital-to-analog converter and used for calibrating the digital signal and sending the calibrated digital signal to the first digital-to-analog converter; the first digital-to-analog converter is used for converting the calibrated digital signal into an analog radio frequency signal and sending the analog radio frequency signal out, and the radio frequency signal of the chip can be calibrated without an external calibration tool by arranging the first analog-to-digital converter, the first digital-to-analog converter and the digital circuit on the chip.
Description
Technical Field
The present application relates to the field of communications devices, and more particularly, to a transceiver with calibration function.
Background
A transceiver (transceiver) is a communication device integrating receiving and transmitting functions, and due to the limitation of a chip of the transceiver, optimal performance of transmitting and receiving signals is difficult to achieve, and the transceiver often needs to be calibrated; or in practice, a corresponding circuit is designed for the transceiver chip itself to ensure that the transceiver chip can be used without calibration, but in this case, the chip consumes too much energy and the circuit design area is too large to meet the actual demand.
Disclosure of Invention
A primary object of the present application is to provide a transceiver with calibration function that has a small chip area and is convenient for calibration.
In view of the above object, the present application provides a transceiver with calibration function, which includes a chip and a calibration circuit disposed on the chip, where the calibration circuit includes a first analog-to-digital converter, a first digital-to-analog converter, and a digital circuit;
the input end of the first analog-to-digital converter is connected to the transmitting end of the chip, and the output end of the first analog-to-digital converter is connected to the input end of the digital circuit and used for converting a received radio frequency signal into a digital signal and sending the digital signal to the digital circuit;
the output end of the digital circuit is connected to the input end of the first digital-to-analog converter, and the digital circuit is used for calibrating the digital signal and sending the calibrated digital signal to the first digital-to-analog converter;
the first digital-to-analog converter is used for converting the calibrated digital signal into an analog radio frequency signal and sending out the analog radio frequency signal.
Further, the calibration circuit further comprises a first low-pass filter and a first mixing module;
the input end of the first low-pass filter is connected to the output end of the first digital-to-analog converter, and the output end of the first low-pass filter is connected to the input end of the first frequency mixing module, and is used for filtering interference from the analog radio-frequency signal sent by the first digital-to-analog converter and sending the analog radio-frequency signal after filtering the interference signal to the first frequency mixing module;
the output end of the first frequency mixing module is connected with a signal transmitting end in a butt joint mode, and the analog radio-frequency signal after the interference signal is filtered is used for carrying out frequency mixing processing and is transmitted out through the signal transmitting end.
Further, the calibration circuit further comprises a second mixing module and a second low-pass filter;
the input end of the second frequency mixing module is connected with a signal receiving end, and the output end of the second frequency mixing module is connected with the input end of the second low-pass filter and used for receiving signals, performing frequency mixing processing on the received signals and then sending the signals to the second low-pass filter;
the output end of the second low-pass filter is connected to the receiving end of the chip, and is used for filtering interference of the signal sent by the second frequency mixing module and sending the signal to the chip.
Further, an output end of the first frequency mixing module is connected to an input end of the second frequency mixing module, and an output end of the second low-pass filter is connected to an input end of the first analog-to-digital converter through a first switch; when the first switch is switched on, the digital circuit sends a preset signal to the first digital-to-analog converter, the preset signal is converted by the first digital-to-analog converter, then sequentially processed by the first low-pass filter, the first frequency mixing module, the second frequency mixing module and the second low-pass filtering module, and converted by the first analog-to-digital converter and then returned to the digital circuit, so that the calibration test of the calibration circuit is realized.
Further, the second mixing module comprises a second mixer and a first low noise amplifier;
the input end of the first low-noise amplifier is connected to the signal receiving end, the output end of the first low-noise amplifier is connected to the input end of the second mixer, and the first low-noise amplifier is used for receiving signals, amplifying the received signals and then sending the amplified signals to the second mixer;
and the output end of the second frequency mixer is connected to the input end of the second low-pass filter, and is used for performing frequency mixing processing on the amplified signal and sending the amplified signal to the second low-pass filter.
Further, the second frequency mixing module further includes a first predistortion element, an input end of the first predistortion element is connected to an output end of the first frequency mixing module, an output end of the first predistortion element is connected to an input end of the second frequency mixer, and the first predistortion element is configured to receive a signal sent by the first frequency mixing module and perform predistortion processing on the received signal;
when the first switch is switched on, the digital circuit sends a preset signal to the first digital-to-analog converter, the preset signal is converted by the first digital-to-analog converter, then sequentially processed by the first low-pass filter, the first frequency mixing module, the first predistortion element, the second frequency mixer and the second low-pass filter, and converted by the first analog-to-digital converter and then returned to the digital circuit, so that the calibration test of the calibration circuit is realized.
Further, the calibration circuit further comprises a third low-pass filter, and the first analog-to-digital converter is connected to the transmitting end of the chip through the third low-pass filter;
the third low-pass filter is used for filtering interference from the received radio-frequency signal and sending the radio-frequency signal after the interference signal is filtered to the first analog-to-digital converter.
Further, the calibration circuit further comprises a second analog-to-digital converter and a second digital-to-analog converter, and the second low-pass filter is connected to the receiving end of the chip through the second analog-to-digital converter, the digital circuit and the second digital-to-analog converter in sequence;
the second analog-to-digital converter is used for converting the analog signal sent by the second low-pass filter into a digital signal and sending the digital signal to the digital circuit, the digital circuit calibrates the digital signal and then sends the digital signal to the second digital-to-analog converter, and the second digital-to-analog converter sends the calibrated signal to the receiving end of the chip.
Furthermore, the output end of the first frequency mixing module is connected to the input end of the second frequency mixing module, and when the digital circuit sends a preset signal to the first digital-to-analog converter, the first digital-to-analog converter converts the preset signal into an analog signal, and the analog signal is processed by the first low-pass filter, the first frequency mixing module, the second frequency mixing module and the second low-pass filter in sequence, and then converted back to the digital circuit by the second analog-to-digital converter, so as to realize the calibration test of the calibration circuit.
The chip further comprises a fourth low-pass filter, the fourth low-pass filter is connected to the receiving end of the chip after passing through the first analog-to-digital converter, the digital circuit and the first digital-to-analog converter in sequence, a second switch is connected between the fourth low-pass filter and the first analog-to-digital converter, and a third switch is connected between the first digital-to-analog converter and the receiving end of the chip;
when the second switch and the third switch are switched on, the fourth low-pass filter filters interference of the received signal and sends the signal to the first analog-to-digital converter, the first analog-to-digital converter converts the signal subjected to interference filtering to obtain a digital signal and sends the digital signal to the digital circuit, the digital circuit calibrates the digital signal and sends the digital signal to the first digital-to-analog converter, and the first digital-to-analog converter converts the calibrated digital signal to obtain a calibrated analog signal and sends the analog signal to the receiving end of the chip.
The beneficial effect of this application:
the application provides a transceiver with calibration function, through set up first adc, first digital-to-analog converter and digital circuit on the chip, can realize carrying out calibration processing to the radio frequency signal that the chip sent, need not external calibration instrument, circuit structure is simple moreover, and area occupied is less, has reduced the area of chip effectively under the prerequisite of correctability.
Drawings
Fig. 1 is a circuit diagram of a calibration circuit of a transceiver having a calibration function according to an embodiment of the present application;
fig. 2 is a circuit diagram of a calibration circuit of a transceiver having a calibration function according to a second embodiment of the present application;
fig. 3 is a circuit diagram of a calibration circuit of a transceiver having a calibration function according to a third embodiment of the present application;
fig. 4 is a circuit diagram of a calibration circuit of a transceiver having a calibration function according to a fourth embodiment of the present application.
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In addition, descriptions in this application as to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
The first embodiment is as follows:
referring to fig. 1, the present application provides a transceiver with calibration function, which is used for receiving and transmitting signals, and specifically, the transceiver includes a chip and a calibration circuit disposed on the chip, where the calibration circuit includes a first analog-to-Digital converter 31-1, a first Digital-to-analog converter 31-2, and a Digital circuit 1 (Digital); the first analog-to-digital converter 31-1 may be an adc (analog-to-digital converter) for converting an analog signal into a digital signal; the first digital-to-Analog converter 31-2 may be a dac (digital-to-Analog converter) for converting a digital signal into an Analog signal; the digital circuit 1 performs digital processing on a digital signal by using an algorithm model, so as to correct parameters of the digital signal and further achieve digital signal calibration, for example, TX IQ offset correction is performed on a signal at a transmitting end, that is, offsets of the signal in two vector directions of I offset and Q offset are corrected, so as to cancel dc offset, or predistortion of an amplifier and angular compensation of a low pass filter are performed.
Specifically, the input end of the first analog-to-digital converter 31-1 is connected to the transmitting end (TX end) of the chip, the output end is connected to the input end of the digital circuit 1, and the first analog-to-digital converter 31-1 is configured to convert a received radio frequency signal into a digital signal and send the digital signal to the digital circuit 1; the output end of the digital circuit 1 is connected to the input end of the first digital-to-analog converter 31-2, and the digital circuit 1 is used for calibrating the digital signal and sending the calibrated digital signal to the first digital-to-analog converter 31-2; the first dac 31-2 is used to convert the calibrated digital signal into an analog rf signal and transmit the analog rf signal.
Therefore, the first analog-to-digital converter 31-1, the first digital-to-analog converter 31-2 and the digital circuit 1 are integrated on the chip, so that the radio-frequency signal sent by the chip can be calibrated without an external calibration tool, the circuit structure is simple, the occupied area is small, and the area of the chip is effectively reduced on the premise of calibration.
In order to further improve the transmission and reception effect of the transceiver, a low-Pass filter (L ow Pass filter, L PF for short), a mixer module, etc. may be added to the calibration circuit to process the signal.
In one embodiment, the calibration circuit further includes a first low-pass filter 21 and a first mixing module; the input end of the first low-pass filter 21 is connected to the output end of the first digital-to-analog converter 31-2, the output end of the first low-pass filter 21 is connected to the input end of the first frequency mixing module, the output end of the first frequency mixing module is connected to the signal transmitting end, and the first low-pass filter 21 is used for filtering the analog radio-frequency signal sent by the first digital-to-analog converter 31-2, namely filtering interference on the signal and sending the analog radio-frequency signal after the interference signal is filtered to the first frequency mixing module; the first frequency mixing module is used for performing frequency mixing, amplification and other processing on the analog radio-frequency signal subjected to interference signal filtering, and sending the analog radio-frequency signal through the signal transmitting end, wherein the frequency mixing processing can be that the analog radio-frequency signal and a local oscillator signal are subjected to frequency mixing processing.
In this embodiment, the first frequency mixing module includes a first frequency mixer 41 and an amplifier, an input end of the first frequency mixer 41 is connected to an output end of the first low-pass filter 21, an output end of the first frequency mixer 41 is connected to an input end of the amplifier, an output end of the amplifier is connected to a signal transmitting end, and the first frequency mixer 41 is configured to perform frequency mixing processing on an analog radio frequency signal sent by the first low-pass filter 21 and send the analog radio frequency signal to the amplifier; the Amplifier is configured to amplify the signal sent by the first mixer 41 and send the amplified signal through the signal transmitting terminal, where the Amplifier may include a power Amplifier 42 (PA) and a Gain Amplifier 43 (PGA), specifically, an output terminal of the first mixer 41 is connected to an input terminal of the Gain Amplifier 43, an output terminal of the Gain Amplifier 43 is connected to an input terminal of the power Amplifier 42, and an output terminal of the power Amplifier 42 is connected to the signal transmitting terminal.
In an embodiment, the calibration circuit further includes a third low pass filter 23, the first analog-to-digital converter 31-1 is connected to the transmitting end of the chip through the third low pass filter 23, the third low pass filter 23 is configured to filter interference from the received radio frequency signal and send the radio frequency signal after filtering the interference signal to the first analog-to-digital converter 31-1, specifically, an input end of the first analog-to-digital converter 31-1 is connected to an output end of the third low pass filter 23, and an input end of the third low pass filter 23 is connected to the transmitting end of the chip, so that the radio frequency signal may be processed by the third low pass filter 23 before being sent to the first analog-to-digital converter 31-1.
When the transceiver needs to send out a radio frequency signal, the chip transmitting end sends the radio frequency signal to the third low-pass filter 23, the third low-pass filter 23 filters interference from the radio frequency signal, sends the radio frequency signal to the first analog-to-digital converter 31-1, and converts the radio frequency signal into a digital signal through the first analog-to-digital converter 31-1, the digital signal is calibrated through the digital circuit 1, the calibrated digital signal is converted into an analog signal through the first digital-to-analog converter 31-2, then the interference signal is filtered through the first low-pass filter 21, the frequency mixing processing is carried out through the first frequency mixing module, and the digital signal is sent out through the signal transmitting end.
Example two:
referring to fig. 2, the calibration circuit further includes a second mixing module and a second low-pass filter 22, an input end of the second mixing module is connected to the signal receiving end, an output end of the second mixing module is connected to an input end of the second low-pass filter 22, an output end of the second low-pass filter 22 is connected to a receiving end (RX end) of the chip, the second mixing module is configured to receive an input signal, perform mixing and amplification on the received input signal, and then send the received input signal to the second low-pass filter 22, and the second low-pass filter 22 is configured to perform interference filtering processing on the signal sent by the second mixing module and send the signal to the receiving end of the chip.
When the transceiver receives a signal, the second frequency mixing module receives an input signal through the signal receiving terminal, then performs frequency mixing processing on the input signal, sends the signal after frequency mixing to the second low-pass filter 22 for processing, and sends the signal to the chip after filtering an interference signal.
In one embodiment, the second mixing module includes a second mixer 46 and a first low noise amplifier 44 (L NA), wherein an input terminal of the first low noise amplifier 44 is connected to the signal receiving terminal, an output terminal of the first low noise amplifier 44 is connected to an input terminal of the second mixer 46, an output terminal of the second mixer 46 is connected to an input terminal of the second low pass filter 22, the first low noise amplifier 44 is configured to receive a signal and amplify the received signal and transmit the amplified signal to the second mixer 46, and the second mixer 46 is configured to mix the amplified signal and transmit the amplified signal to the second low pass filter 22.
In one embodiment, to further ensure that the calibration circuit works properly, the transceiver can send out a better signal, and the calibration circuit can be tested first, specifically referring to fig. 2, the output terminal of the first frequency mixing module is connected to the input terminal of the second frequency mixing module, and the output terminal of the second low pass filter 22 is connected to the input terminal of the first analog-to-digital converter 31-1 through the first switch 51; when the transceiver is just started or before transmitting a signal, or in a standby state of the transceiver, the first switch 51 is turned on, the digital circuit 1 sends a preset signal to the first digital-to-analog converter 31-2, the preset signal may be a sine wave signal, the preset signal is converted into an analog signal by the first digital-to-analog converter 31-2 and then sent to the first low-pass filter 21 for filtering, then sent to the first frequency mixing module for frequency mixing, then sent to the second frequency mixing module for frequency mixing again, then filtered by the second low-pass filter 22 for interference elimination, and then returned to the digital circuit 1 after being converted by the first analog-to-digital converter 31-1, so as to realize the calibration test of the calibration circuit, when the signal received by the digital circuit 1 is consistent with the preset signal sent before, it is indicated that the parameters of the digital circuit 1 are accurate and appropriate, the adjustment is not needed, when the signal received by the digital circuit 1 is inconsistent with the previous preset signal, for example, a sine wave signal is emitted, but the recovered square wave signal indicates that the parameter of the digital circuit 1 is not accurate, the parameter of the digital circuit 1 needs to be adjusted.
Further, the second frequency mixing module includes a first predistortion component 45 (DPD), the first predistortion component 45 is used for performing predistortion processing on a signal, in this embodiment, the signal recovery of the digital circuit 1 is realized by connecting the first predistortion component 45 with the first frequency mixing module, specifically, the input end of the first predistortion component 45 is connected to the output end of the first frequency mixing module, the output end of the first predistortion component 45 is connected to the input end of the second frequency mixer 46, when the first switch 51 is turned on, the digital circuit 1 sends a preset signal to the first digital-to-analog converter 31-2, the preset signal is converted by the first digital-to-analog converter 31-2, and then sequentially passes through the first low pass filter 21, the first frequency mixing module, the first predistortion component 45, the second frequency mixer 46 and the second low pass filter 22, and is converted by the first analog-to-digital converter 31-1 and then returns to the digital circuit 1, thereby realizing the calibration test of the calibration circuit.
In another embodiment, when the calibration circuit includes the third low-pass filter 23, the output terminal of the second low-pass filter 22 may be connected to the input terminal of the third low-pass filter 23 through the fifth switch 55, the first switch 51 may not be provided at this time, when the first switch 51 is not provided, the fifth switch 55 is directly turned on when the calibration test is performed, at this time, the digital circuit 1 sends the preset signal to the first digital-to-analog converter 31-2, the preset signal is converted by the first digital-to-analog converter 31-2, sequentially processed by the first low-pass filter 21, the first frequency mixing module, the second low-pass filter 22 and the third low-pass filter 23, and converted by the first analog-to-digital converter 31-1 to return to the digital circuit 1, thereby implementing the calibration test of the calibration circuit, a low pass filter is added before the first adc 31-1, and since the signal is processed by two low pass filters continuously, the filtering effect is better, so that the result of the calibration test is more accurate.
Of course, the first switch 51 and the fifth switch 55 may be simultaneously disposed in the circuit structure, when the calibration test is required, the first switch 51 is turned off and the second switch 52 is turned on, and the signal flow direction is the same as that described above, and the calibration test of the calibration circuit may also be implemented, and when the first switch 51 is turned on, the second switch 52 is turned off, and at this time, the signal flow direction refers to the signal flow direction of the calibration circuit without the second switch 52, which is not described herein again.
Example three:
a set of analog-to-digital converter and digital-to-analog converter may be added to the calibration circuit to calibrate the received signal of the transceiver, for example, in the receiving part of the transceiver, the digital circuit 1 performs Automatic Gain Control (AGC) to realize the gains of the receiver front end and the programmable gain amplifier. Referring to fig. 3 specifically, the calibration circuit further includes a second analog-to-digital converter 32-1 and a second digital-to-analog converter 32-2, and the second low-pass filter 22 is connected to the receiving end of the chip sequentially through the second analog-to-digital converter 32-1, the digital circuit 1 and the second digital-to-analog converter 32-2; specifically, the output end of the second low-pass filter 22 is connected to the input end of the second analog-to-digital converter 32-1, the output end of the second analog-to-digital converter 32-1 is connected to the input end of the digital circuit 1, the output end of the digital circuit 1 is connected to the input end of the second digital-to-analog converter 32-2, and the output end of the second digital-to-analog converter 32-2 is connected to the receiving end of the chip; when the transceiver receives a signal, the second frequency mixing module receives the signal, performs frequency mixing processing on the signal, and then sends the signal to the second low-pass filter 22, the second low-pass filter 22 filters an interference signal and then sends the signal to the second analog-to-digital converter 32-1, the second analog-to-digital converter 32-1 converts an analog signal sent by the second low-pass filter 22 into a digital signal and sends the digital signal to the digital circuit 1, the digital circuit 1 calibrates the digital signal and then sends the signal to the second analog-to-digital converter 32-2, and the second analog-to-digital converter 32-2 sends the calibrated signal to a receiving end of the chip. Therefore, on the premise of not increasing the digital circuit 1, the calibration work of the transmitting signal and the receiving signal of the transceiver can be realized only by adding the analog-to-digital converter and the digital-to-analog converter, and the calibration is convenient and has low manufacturing cost.
Further, through the above calibration circuit structure, calibration test of the calibration circuit can be also achieved, specifically, the output end of the first frequency mixing module is connected to the input end of the second frequency mixing module, when the digital circuit 1 sends a preset signal to the first digital-to-analog converter 31-2, the first digital-to-analog converter 31-2 converts the preset signal into an analog signal, and the analog signal is processed by the first low-pass filter 21, the first frequency mixing module, the second frequency mixing module and the second low-pass filter 22 in sequence, and then converted back to the digital circuit 1 by the second analog-to-digital converter 32-1, so as to achieve calibration test of the calibration circuit.
Furthermore, on this basis, a sixth switch 56 may be further provided to implement the calibration test of the calibration circuit, where the sixth switch 56 is disposed between the second digital-to-analog converter 32-2 and the third low-pass filter 23, that is, the output end of the second digital-to-analog converter 32-2 is connected to the input end of the third low-pass filter 23 through the sixth switch 56, when the sixth switch 56 is turned on, the digital circuit 1 sends a preset signal to the first digital-to-analog converter 31-2, then the first digital-to-analog converter 31-2 converts the preset signal into an analog signal, and the analog signal is processed by the first low-pass filter 21, the first frequency mixing module, the second frequency mixing module, and the second low-pass filter 22 in sequence, and then is converted by the second analog-to-digital converter 32-1 and then is sent to the digital circuit 1 for conversion, at this time, in order to further improve the test accuracy, the digital circuit 1 sends the signal to the second digital-to the second, then, the interference signal is filtered by the third low pass filter 23, and then the signal is converted by the first analog-to-digital converter 31-1 and returned to the digital circuit 1, so that the calibration test of the calibration circuit is realized.
Example four:
referring to fig. 4, in this embodiment, calibration of the transceiver receiving signal portion and the transceiver transmitting signal portion can also be achieved only by the first analog-to-digital converter 31-1, the digital circuit 1 and the first digital-to-analog converter 31-2, as in the first embodiment, the calibration is achieved by the second switch 52, the third switch 53 and the fourth switch 54, specifically, the calibration circuit further includes the fourth low-pass filter 24, the fourth low-pass filter 24 is connected to the receiving end of the chip through the first analog-to-digital converter 31-1, the digital circuit 1 and the first digital-to-analog converter 31-2 in sequence, the second switch 52 is connected between the fourth low-pass filter 24 and the first analog-to-digital converter 31-1, the third switch 53 is connected between the first digital-to-analog converter 31-2 and the receiving end of the chip, and preferably, when the output end of the first digital-to-analog converter 31-2 is further connected to the first low, a fourth switch 54 is connected between the first digital-to-analog converter 31-2 and the first low-pass filter 22. Specifically, the output end of the fourth low-pass filter 24 is connected to the input end of the first analog-to-digital converter 31-1 through the second switch 52, and the output end of the first digital-to-analog converter 31-2 is connected to the receiving end of the chip through the third switch 53, in this embodiment, the input end of the fourth low-pass filter 24 may further be connected to a third frequency mixing module, the structure of the third frequency mixing module may be the same as that of the second frequency mixing module, and may also include a third frequency mixer 61, a second low noise amplifier 62, and the like, and in a case that the third frequency mixing module further includes a second predistortion element 63, the third frequency mixing module may be connected to the first frequency mixing module through the second predistortion element 63.
When the second switch 52 and the third switch 53 are turned on and the fourth switch 54 is provided, the fourth switch 54 is turned off, the third frequency mixing module receives the signal, amplifies and mixes the signal, and then sends the processed signal to the fourth low-pass filter 24, the fourth low-pass filter 24 filters the received signal to remove interference and sends the signal to the first analog-to-digital converter 31-1, the first analog-to-digital converter 31-1 converts the signal after the interference is removed to obtain a digital signal and sends the digital signal to the digital circuit 1, the digital circuit 1 performs calibration processing on the digital signal and sends the digital signal to the first digital-to-analog converter 31-2, and the first digital-to-analog converter 31-2 converts the calibrated digital signal to obtain a calibrated analog signal and sends the analog signal to the receiving end of the chip. Therefore, the receiving part of the transceiver and the transmitting part of the transceiver can share the same set of the first analog-to-digital converter 31-1, the digital circuit 1 and the first digital-to-analog converter 31-2 to realize signal calibration, thereby greatly reducing the circuit layout area of the chip and reducing the manufacturing cost.
The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application, or which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A transceiver with calibration function, comprising a chip and a calibration circuit disposed on the chip, wherein the calibration circuit comprises a first analog-to-digital converter, a first digital-to-analog converter and a digital circuit;
the input end of the first analog-to-digital converter is connected to the transmitting end of the chip, and the output end of the first analog-to-digital converter is connected to the input end of the digital circuit and used for converting a received radio frequency signal into a digital signal and sending the digital signal to the digital circuit;
the output end of the digital circuit is connected to the input end of the first digital-to-analog converter, and the digital circuit is used for calibrating the digital signal and sending the calibrated digital signal to the first digital-to-analog converter;
the first digital-to-analog converter is used for converting the calibrated digital signal into an analog radio frequency signal and sending out the analog radio frequency signal.
2. The transceiver with calibration function of claim 1, wherein the calibration circuit further comprises a first low pass filter and a first mixing module;
the input end of the first low-pass filter is connected to the output end of the first digital-to-analog converter, and the output end of the first low-pass filter is connected to the input end of the first frequency mixing module, and is used for filtering interference from the analog radio-frequency signal sent by the first digital-to-analog converter and sending the analog radio-frequency signal after filtering the interference signal to the first frequency mixing module;
the output end of the first frequency mixing module is connected with a signal transmitting end in a butt joint mode, and the analog radio-frequency signal after the interference signal is filtered is used for carrying out frequency mixing processing and is transmitted out through the signal transmitting end.
3. The transceiver with calibration function of claim 2, wherein said calibration circuit further comprises a second mixing module and a second low pass filter;
the input end of the second frequency mixing module is connected with a signal receiving end, and the output end of the second frequency mixing module is connected with the input end of the second low-pass filter and used for receiving signals, performing frequency mixing processing on the received signals and then sending the signals to the second low-pass filter;
the output end of the second low-pass filter is connected to the receiving end of the chip, and is used for filtering interference of the signal sent by the second frequency mixing module and sending the signal to the chip.
4. The transceiver with calibration function of claim 3, wherein the output of the first mixer module is connected to the input of the second mixer module, and the output of the second low pass filter is connected to the input of the first analog-to-digital converter through a first switch; when the first switch is switched on, the digital circuit sends a preset signal to the first digital-to-analog converter, the preset signal is converted by the first digital-to-analog converter, then sequentially processed by the first low-pass filter, the first frequency mixing module, the second frequency mixing module and the second low-pass filtering module, and converted by the first analog-to-digital converter and then returned to the digital circuit, so that the calibration test of the calibration circuit is realized.
5. The transceiver with calibration function of claim 4, wherein said second mixing module comprises a second mixer and a first low noise amplifier;
the input end of the first low-noise amplifier is connected to the signal receiving end, the output end of the first low-noise amplifier is connected to the input end of the second mixer, and the first low-noise amplifier is used for receiving signals, amplifying the received signals and then sending the amplified signals to the second mixer;
and the output end of the second frequency mixer is connected to the input end of the second low-pass filter, and is used for performing frequency mixing processing on the amplified signal and sending the amplified signal to the second low-pass filter.
6. The transceiver with calibration function of claim 5, wherein the second mixer module further comprises a first predistortion component, an input of the first predistortion component is connected to the output of the first mixer module, and an output of the first predistortion component is connected to the input of the second mixer module, the first predistortion component is configured to receive the signal sent by the first mixer module and perform predistortion processing on the received signal;
when the first switch is switched on, the digital circuit sends a preset signal to the first digital-to-analog converter, the preset signal is converted by the first digital-to-analog converter, then sequentially processed by the first low-pass filter, the first frequency mixing module, the first predistortion element, the second frequency mixer and the second low-pass filter, and converted by the first analog-to-digital converter and then returned to the digital circuit, so that the calibration test of the calibration circuit is realized.
7. The transceiver with calibration function of claim 1, wherein the calibration circuit further comprises a third low pass filter, the first analog-to-digital converter being connected to the transmitting end of the chip through the third low pass filter;
the third low-pass filter is used for filtering interference from the received radio-frequency signal and sending the radio-frequency signal after the interference signal is filtered to the first analog-to-digital converter.
8. The transceiver with calibration function of claim 3, wherein the calibration circuit further comprises a second analog-to-digital converter and a second digital-to-analog converter, the second low pass filter being connected to the receiving end of the chip sequentially through the second analog-to-digital converter, the digital circuit and the second digital-to-analog converter;
the second analog-to-digital converter is used for converting the analog signal sent by the second low-pass filter into a digital signal and sending the digital signal to the digital circuit, the digital circuit calibrates the digital signal and then sends the digital signal to the second digital-to-analog converter, and the second digital-to-analog converter is used for sending the calibrated signal to the receiving end of the chip.
9. The transceiver of claim 8, wherein an output of the first mixer module is connected to an input of the second mixer module, and when the digital circuit sends a predetermined signal to the first dac, the first dac converts the predetermined signal into an analog signal, and the analog signal is processed by the first low-pass filter, the first mixer module, the second mixer module, and the second low-pass filter, and then converted back to the digital circuit by the second adc, so as to implement a calibration test of the calibration circuit.
10. The transceiver with calibration function according to claim 1, further comprising a fourth low-pass filter, wherein the fourth low-pass filter is connected to the receiving end of the chip after passing through the first analog-to-digital converter, the digital circuit and the first digital-to-analog converter in sequence, a second switch is connected between the fourth low-pass filter and the first analog-to-digital converter, and a third switch is connected between the first digital-to-analog converter and the receiving end of the chip;
when the second switch and the third switch are switched on, the fourth low-pass filter filters interference of the received signal and sends the signal to the first analog-to-digital converter, the first analog-to-digital converter converts the signal subjected to interference filtering to obtain a digital signal and sends the digital signal to the digital circuit, the digital circuit calibrates the digital signal and sends the digital signal to the first digital-to-analog converter, and the first digital-to-analog converter converts the calibrated digital signal to obtain a calibrated analog signal and sends the analog signal to the receiving end of the chip.
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Address after: 518000 Room 601, block B, garden city digital building, 1079 Nanhai Avenue, Yanshan community, merchants street, Nanshan District, Shenzhen, Guangdong Patentee after: Shenzhen Nanfang Silicon Valley Semiconductor Co.,Ltd. Address before: 518000 room 501A, block B, huayuancheng digital building, 1079 Nanhai Avenue, Yuehai street, Nanshan District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Southern Silicon Valley Semiconductor Co.,Ltd. |