CN114374404B - Correction method and correction circuit for wireless transceiver - Google Patents
Correction method and correction circuit for wireless transceiver Download PDFInfo
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- CN114374404B CN114374404B CN202011099158.0A CN202011099158A CN114374404B CN 114374404 B CN114374404 B CN 114374404B CN 202011099158 A CN202011099158 A CN 202011099158A CN 114374404 B CN114374404 B CN 114374404B
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000012937 correction Methods 0.000 title abstract description 10
- 230000008878 coupling Effects 0.000 claims abstract description 19
- 238000010168 coupling process Methods 0.000 claims abstract description 19
- 238000005859 coupling reaction Methods 0.000 claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000013461 design Methods 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Classifications
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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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Abstract
The invention discloses a calibration method and a calibration circuit of a wireless transceiver. The wireless transceiver includes a transmission path and a reception path, and the transmission path includes a mixer. The correction method comprises the following steps: (A) Adjusting a first parameter of a first resonant circuit of the mixer; (B) Receiving a first input signal through a coupling path and the receiving path; (C) measuring a first power of the first input signal; (D) Repeating steps (a) through (C) to obtain a plurality of first powers; and (E) finding a first target parameter corresponding to a maximum of the first powers.
Description
Technical Field
The present invention relates to wireless transceivers, and more particularly, to a calibration method and calibration circuit for wireless transceivers.
Background
One wireless transceiver (wireless transceiver) may operate in multiple frequency bands (bands), with one band containing multiple channels (channels). Wireless transceivers are typically designed to have the same output power for different frequency channels of the same frequency band, i.e., to have a high flatness (flat).
In the design stage, the resonant circuit (LC tank circuit) of the radio frequency circuit of the wireless transceiver needs to be optimally adapted to set parameters (i.e., inductance and capacitance), so that the frequency response of the radio frequency circuit has the best flatness. However, there are often process errors in mass production. If the process error exceeds the tolerance range of the parameters set during development, the flatness of the wireless transceiver will be degraded.
One of the conventional solutions is to increase the power of the baseband circuit and/or the intermediate frequency circuit of the wireless transceiver to compensate for the shortage of rf power. However, the baseband circuit and the intermediate frequency circuit each have a set upper power limit, and increasing the power of the baseband circuit or the intermediate frequency circuit may decrease the linearity of the baseband circuit or the intermediate frequency circuit, or even cause saturation of the baseband circuit or the intermediate frequency circuit. Poor linearity or circuit saturation can degrade the performance of the wireless transceiver.
Disclosure of Invention
In view of the shortcomings of the prior art, an objective of the present invention is to provide a calibration method and calibration circuit for a wireless transceiver to improve the flatness of the wireless transceiver.
The invention discloses a method for calibrating a wireless transceiver. The wireless transceiver includes a transmission path and a reception path, and the transmission path includes a mixer. The method comprises the following steps: (A) Adjusting a first parameter of a first resonant circuit of the mixer; (B) Receiving a first input signal through a coupling path and the receiving path; (C) measuring a first power of the first input signal; (D) Repeating steps (a) through (C) to obtain a plurality of first powers; and (E) finding a first target parameter corresponding to a maximum of the first powers.
The invention also discloses a correction circuit of the wireless transceiver. The wireless transceiver includes a transmission path and a reception path, and the transmission path includes a mixer. The calibration circuit includes a memory and a control circuit. The memory stores a plurality of program codes or program instructions. The control circuit is coupled to the memory for executing the program codes or program instructions to perform the following steps: (A) Adjusting a first parameter of a first resonant circuit of the mixer; (B) Receiving a first input signal through a coupling path and the receiving path; (C) measuring a first power of the first input signal; (D) Repeating steps (a) through (C) to obtain a plurality of first powers; and (E) finding a first target parameter corresponding to a maximum of the first powers.
The correction method and the correction circuit of the wireless transceiver can improve the flatness of the wireless transceiver. Compared with the prior art, the wireless transceiver corrected by the technology of the invention has no problems of poor linearity and circuit saturation.
The features, implementation and effects of the present invention are described in detail below with reference to the drawings.
Drawings
FIG. 1 is a functional block diagram of a wireless transceiver and calibration circuit thereof according to the present invention;
FIG. 2 is a flow chart of an embodiment of a calibration method of a wireless transceiver of the present invention;
FIG. 3 is a flow chart of another embodiment of a calibration method of a wireless transceiver of the present invention;
FIGS. 4A and 4B show part of the circuitry of the resonant circuit; and
fig. 5 is a flow chart of the calibration method of the present invention for calibrating a plurality of frequencies (or channels) of a wireless transceiver.
Detailed Description
The technical terms used in the following description refer to the conventional terms in the art, and some terms are described or defined in the specification, and the explanation of the some terms is based on the description or definition of the specification.
The present disclosure includes calibration methods and calibration circuits for wireless transceivers. Since some of the components included in the wireless transceiver of the present invention may be known components alone, the details of the known components will be omitted from the following description without affecting the full disclosure and applicability of the device. In addition, some or all of the processes of the calibration method of the wireless transceiver of the present invention may be in the form of software and/or firmware, and may be performed by the calibration circuit of the wireless transceiver of the present invention or an equivalent thereof, without affecting the full disclosure and applicability of the method, the following description of the method will focus on the contents of the steps rather than the hardware.
Fig. 1 is a functional block diagram of a wireless transceiver and a calibration circuit thereof according to the present invention. The calibration circuit 100 includes a control circuit 110 and a memory 120. The wireless transceiver includes a transmit path 130 and a receive path 140. The transmit path 130 is coupled to an antenna 171, and the receive path 140 is coupled to an antenna 172. The wireless transceiver transmits an output signal (transmitted via antenna 171) through transmission path 130 and receives an input signal (received via antenna 172) through reception path 140. The transmission path 130 includes a digital-to-analog converter (DAC) 132, a filter 134, a mixer 136, and a Power Amplifier (PA) 138. The receive path 140 includes an analog-to-digital converter (ADC) 142, a programmable gain amplifier (programmable gain amplifier, PGA) 144, a mixer 146, and a Low Noise Amplifier (LNA) 148. The operation principle and the functions of each element of the wireless transceiver are well known to those skilled in the art, and thus will not be described in detail. Mixer 136 and power amplifier 138 each include a resonant circuit, and the inductance and/or capacitance of the resonant circuit is adjustable.
Fig. 2 is a flowchart of an embodiment of a calibration method of a wireless transceiver according to the present invention. The following description refers to fig. 1 and 2.
Step S210: the control circuit 110 adjusts parameters of the resonant circuit of the mixer 136 through the control signal Ctrl 1. The parameter is the inductance and capacitance of the resonant circuit. Adjusting parameters of the resonant circuit means adjusting the inductance value and/or the capacitance value of the resonant circuit. In some embodiments, the memory 120 stores a plurality of candidate values, and the control circuit 110 selects one candidate value at a time to set the parameters of the resonant circuit. One candidate corresponds to one combination of inductance and capacitance. Step S210 includes substep S215: the control circuit 110 fixes the parameters of the resonant circuit of the power amplifier 138 via the control signal Ctrl 2; in other words, when the control circuit 110 adjusts the parameters of the resonant circuit of the mixer 136, the control circuit 110 maintains the parameters of the resonant circuit of the power amplifier 138 unchanged (i.e., controls the power amplifier 138 to operate at a fixed frequency).
In some embodiments, the inductance value of the resonant circuit of the mixer 136 is constant, and the control circuit 110 adjusts the equivalent capacitance value of the resonant circuit according to the candidate value through the control signal Ctrl 1. As shown in fig. 4A, the resonant circuit includes an inductance L (the inductance is constant) and a plurality of capacitors (C1, C2, …, ck, k are positive integers greater than 1), and the control circuit 110 adjusts the equivalent capacitance of the resonant circuit by switching the plurality of switches 310. In other words, one candidate corresponds to one configuration (equivalent to one configuration of the capacitors) of the switches 310.
In other embodiments, the capacitance of the resonant circuit of the mixer 136 is constant, and the control circuit 110 adjusts the equivalent inductance of the resonant circuit according to the candidate value through the control signal Ctrl 1. As shown in fig. 4B, the resonant circuit includes a capacitor C (the capacitance is constant) and a plurality of inductors (L1, L2, …, lk), and the control circuit 110 adjusts the equivalent inductance of the resonant circuit by switching the plurality of switches 320. In other words, one candidate corresponds to one configuration of the switches 320 (equivalent to one configuration of the inductors).
After the parameters of the resonant circuit of the mixer 136 are changed, the frequency response of the first output signal TS1 transmitted through the transmission path 130 is also changed.
Step S220: the control circuit 110 receives the first input signal RS1 through the receiving path 140, the coupling path 150 or the coupling path 160. The coupling path 150 is a wired path, located within the wireless transceiver, and is coupled between the output of the power amplifier 138 and the input of the mixer 146. In other words, the first output signal TS1 is coupled or input to the mixer 146 via the coupling path 150. The coupling path 150 includes an attenuator 152, and the attenuator 152 is used to attenuate the first output signal TS1 to avoid the excessive power of the signal input to the mixer 146. When the control circuit 110 receives the first input signal RS1 through the coupling path 150, the control circuit 110 controls the input terminal of the low noise amplifier 148 to be grounded and/or disables the low noise amplifier 148. Coupling path 160 is a wireless path, i.e., a wireless transmission between antenna 171 and antenna 172.
Step S225: the control circuit 110 measures and records the first power of the first input signal RS1. The method for measuring the power of the signal in the digital domain is well known to those skilled in the art, and will not be described in detail. The control circuit 110 records the measured first power and the parameter (i.e. the current candidate value) corresponding to the first power.
Step S230: the control circuit 110 determines whether there are candidates in the memory 120 that have not yet been processed. If there are candidate values that have not been processed (yes in step S230), the control circuit 110 selects another candidate value, and executes step S210, step S220, step S225, and step S230 again. If there are no candidates that have not yet been processed (NO in step S230), this represents that mixer 136 has been calibrated.
Step S235: the control circuit 110 finds the maximum of the first powers and records the resonant circuit parameter (hereinafter referred to as the first target parameter) corresponding to the maximum first power. The first target parameter is a preferred or ideal capacitance and inductance of the resonant circuit of the mixer 136. When the resonant circuit of the mixer 136 is set with the first target parameter, the output power of the mixer 136 is relatively large (larger than the output power corresponding to the other parameters).
Fig. 3 is a flowchart of another embodiment of a calibration method of a wireless transceiver according to the present invention. The following description refers to fig. 1 and 3.
Step S240: the control circuit 110 adjusts the parameters of the resonant circuit of the power amplifier 138 via the control signal Ctrl 2. In some embodiments, the inductance value of the resonant circuit of the power amplifier 138 is constant, and the control circuit 110 adjusts the equivalent capacitance value of the resonant circuit according to the candidate value through the control signal Ctrl2 (as shown in fig. 4A). In other embodiments, the capacitance of the resonant circuit of the power amplifier 138 is constant, and the control circuit 110 adjusts the equivalent inductance of the resonant circuit according to the candidate value via the control signal Ctrl2 (as shown in fig. 4B). After the parameters of the power amplifier 138 are changed, the frequency response of the second output signal TS2 transmitted through the transmission path 130 is also changed. Step S240 includes substep S245: the control circuit 110 fixes the parameters of the resonant circuit of the mixer 136 via the control signal Ctrl 1; in other words, when the control circuit 110 adjusts the parameters of the resonant circuit of the power amplifier 138, the control circuit 110 maintains the parameters of the resonant circuit of the mixer 136 unchanged (i.e., controls the mixer 136 to operate at a fixed frequency).
In some embodiments, the power amplifier 138 is a multi-stage amplifier (including a power amplifying driver (power amplifier driver, PAD)), and the control circuit 110 adjusts the parameters of the resonant circuit of either stage in step S240.
Step S250: the control circuit 110 receives the second input signal RS2 through the receiving path 140, the coupling path 150 or the coupling path 160.
Step S255: the control circuit 110 measures and records the second power of the second input signal RS2. The control circuit 110 records the measured second power and the parameter (i.e. the current candidate value) corresponding to the second power.
Step S260: the control circuit 110 determines whether there are candidates in the memory 120 that have not yet been processed. If there are candidate values that have not been processed (yes in step S260), the control circuit 110 selects another candidate value, and executes step S240, step S250, step S255, and step S260 again. If there are no candidates yet to be processed (NO in step S260), it is indicated that the power amplifier 138 has been calibrated.
Step S265: the control circuit 110 finds the maximum of the second powers and records the resonant circuit parameter (hereinafter referred to as the second target parameter) corresponding to the maximum second power. The second target parameter is the preferred or ideal capacitance and inductance of the resonant circuit of the power amplifier 138. When the parameter of the resonant circuit of the power amplifier 138 is set with this second target parameter, the output power of the power amplifier 138 is relatively large (larger than the output power corresponding to the other parameters).
In some embodiments, control circuit 110 corrects only mixer 136 (i.e., performs only the flow of fig. 2) or only power amplifier 138 (i.e., performs only the flow of fig. 3).
In other embodiments, control circuit 110 corrects both mixer 136 and power amplifier 138 (i.e., performs the flows of fig. 2 and 3). The control circuit 110 may calibrate the mixer 136 before the power amplifier 138 (i.e., perform the process of fig. 2 before the process of fig. 3), or may calibrate the power amplifier 138 before the mixer 136 (i.e., perform the process of fig. 3 before the process of fig. 2).
The flow of fig. 2 and 3 is calibrated for a certain frequency (or channel). Referring to fig. 5, fig. 5 is a flowchart illustrating a calibration method for calibrating a plurality of frequencies (or channels) of a wireless transceiver according to the present invention.
Step S410: the control circuit 110 determines a target frequency (or target channel) from the candidate frequencies (or channels). The candidate frequencies (or channels) may be stored in memory 120. After determining the target frequency, the control circuit 110 generates a first output signal TS1 or a second output signal TS2 corresponding to the target frequency (or target channel) (e.g., the frequency of the output signal is equal to or about equal to the target frequency).
Step S420: the control circuit 110 performs the flow of fig. 2 and/or fig. 3 to find the first target parameter and/or the second target parameter corresponding to the target frequency (or target channel).
Step S430: the control circuit 110 determines whether there are frequencies (or channels) that have not been processed. If so, go back to step S410 to determine the next frequency (or channel); if not, the correction is ended (step S440).
After the process of fig. 5 is completed, the first target parameter and/or the second target parameter of the wireless transceiver at a plurality of frequencies (or channels) are obtained. In actual operation, the control circuit 110 can find the corresponding first target parameter and/or second target parameter according to the operating frequency (or frequency channel) of the wireless transceiver, and set the mixer 136 and/or the power amplifier 138 according to the first target parameter and/or the second target parameter, so that the output power of the mixer 136 and/or the power amplifier 138 is more ideal (closer to the design value). In this way, the output power of the wireless transceiver becomes less affected by the process, in other words, the corrected wireless transceiver has higher flatness.
The control circuit 110 may be a circuit or electronic component with program execution capability, such as a central processing unit, microprocessor or micro-processing unit, that performs the steps of fig. 2, 3 and 5 by executing program code or program instructions stored in the memory 120. In other embodiments, one of ordinary skill in the art can design the control circuit 110 based on the disclosure above, i.e., the control circuit 110 can be an application specific integrated circuit (Application Specific Integrated Circuit, ASIC) or implemented by a circuit or hardware such as a programmable logic device (Programmable Logic Device, PLD).
Since those skilled in the art can understand the implementation details and variations of the present method according to the disclosure of the present apparatus, repeated descriptions are omitted herein to avoid redundancy without affecting the disclosure requirements and the implementation of the method. It should be noted that the shapes, sizes and proportions of the elements in the foregoing disclosure are merely illustrative, and are used by those skilled in the art to understand the present invention, and are not intended to limit the present invention. In addition, the steps mentioned in the flowcharts of the foregoing embodiments may be adjusted in order according to actual needs, and may even be performed simultaneously or partially simultaneously.
Although the embodiments of the present invention have been described above, these embodiments are not intended to limit the present invention, and those skilled in the art may make various changes to the technical features of the present invention according to the explicit or implicit disclosure of the present invention, and all the various changes may be within the scope of the present invention, that is, the scope of the present invention should be defined by the claims of the present invention.
[ symbolic description ]
100 correction circuit
110 control circuit
120 memory
130 transport path
132 digital-to-analog converter
134 filter
136,146 mixer
138 Power Amplifier
140 receive path
142 analog to digital converter
144 programmable gain amplifier
148 low noise amplifier
150,160 coupling paths
152 attenuator
171,172 antenna
Ctrl1, ctrl2 control signal
L, L1, L2, lk: inductance
310,320 switch
C, C1, C2, ck capacitance
TS1 first output signal
RS1 first input signal
TS2 second output signal
RS2 second input signal
S210-S265, S410-S440 steps
Claims (7)
1. A method of calibrating a wireless transceiver, wherein the wireless transceiver comprises a transmit path and a receive path, the transmit path comprising a mixer and a power amplifier, the method comprising:
(A) Adjusting a first parameter of a first resonant circuit of the mixer;
(B) Receiving a first input signal through a coupling path and the receiving path;
(C) Measuring a first power of the first input signal;
(D) Repeating steps (a) through (C) to obtain a plurality of first powers;
(E) Finding a first target parameter corresponding to a maximum one of the first powers;
(F) Adjusting a second parameter of a second resonant circuit of the power amplifier;
(G) Receiving a second input signal through the coupling path and the receiving path;
(H) Measuring a second power of the second input signal;
(I) Repeating steps (F) through (H) to obtain a plurality of second powers; and
(J) Find a second target parameter corresponding to a maximum of the second powers,
wherein the second parameter of the second resonant circuit of the power amplifier is fixed when the step (A) is performed, and
wherein the first parameter of the first resonant circuit of the mixer is fixed when the step (F) is performed.
2. The method of claim 1, wherein the coupling path is coupled between the transmit path and the receive path and comprises an attenuator.
3. The method of claim 1, wherein the transmit path is coupled to a first antenna, the receive path is coupled to a second antenna, and the coupling path is a wireless transmission between the first antenna and the second antenna.
4. The method of claim 1, further comprising:
performing steps (a) to (J) for a plurality of frequencies to obtain the first target parameter and the second target parameter for each frequency.
5. The method of claim 1, wherein the first resonant circuit comprises a first inductor and a plurality of first capacitors, the second resonant circuit comprises a second inductor and a plurality of second capacitors, and the step (a) and the step (F) change the configurations of the first capacitors and the second capacitors, respectively.
6. The method of claim 1, wherein the first resonant circuit comprises a first capacitor and a plurality of first inductors, the second resonant circuit comprises a second capacitor and a plurality of second inductors, and the step (a) and the step (F) change the configuration of the first inductors and the configuration of the second inductors, respectively.
7. A calibration circuit for a wireless transceiver, wherein the wireless transceiver comprises a transmit path and a receive path, the transmit path comprising a mixer and a power amplifier, the calibration circuit comprising:
a memory storing a plurality of program codes or program instructions; and
a control circuit, coupled to the memory, for executing the program codes or program instructions to perform the following steps:
(A) Adjusting a first parameter of a first resonant circuit of the mixer;
(B) Receiving a first input signal through a coupling path and the receiving path;
(C) Measuring a first power of the first input signal;
(D) Repeating steps (a) through (C) to obtain a plurality of first powers;
(E) Finding a first target parameter corresponding to a maximum one of the first powers;
(F) Adjusting a second parameter of a second resonant circuit of the power amplifier;
(G) Receiving a second input signal through the coupling path and the receiving path;
(H) Measuring a second power of the second input signal;
(I) Repeating steps (F) through (H) to obtain a plurality of second powers; and
(J) Find a second target parameter corresponding to a maximum of the second powers,
wherein the second parameter of the second resonant circuit of the power amplifier is fixed when the step (A) is performed, and
wherein the first parameter of the first resonant circuit of the mixer is fixed when the step (F) is performed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011099158.0A CN114374404B (en) | 2020-10-14 | 2020-10-14 | Correction method and correction circuit for wireless transceiver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011099158.0A CN114374404B (en) | 2020-10-14 | 2020-10-14 | Correction method and correction circuit for wireless transceiver |
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| CN114374404A CN114374404A (en) | 2022-04-19 |
| CN114374404B true CN114374404B (en) | 2024-01-02 |
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