Dual-band wireless transceiver circuit, radio frequency transceiver module and radio frequency transceiver

Abstract

The invention provides a dual-band wireless transceiver circuit, a radio frequency transceiver module and a radio frequency transceiver, which are applied to the technical field of communication, and comprise a dual-band receiving circuit, a dual-band transmitting circuit, a dual-band sharing module, a calibration excitation source, a calibration excitation source driving circuit, an output driving circuit and a frequency synthesizer, wherein the dual-band receiving circuit and the dual-band transmitting circuit share a dual-band sharing module, the calibration excitation source driving circuit provides high-band and low-band local oscillator clocks for the dual-band transmitting circuit, and the output driving circuit provides high-band and low-band local oscillator clocks for the dual-band receiving circuit. Therefore, wire channels do not need to be independently designed for different frequency bands, the use of devices is reduced, and the area and the cost of a chip are further reduced.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a dual-band wireless transceiver circuit, a radio frequency transceiver module and a radio frequency transceiver. Background Art

[0002] With the popularization of wireless communication products, more and more RF transceivers integrate multi-band communication protocols, such as WIFI time division duplex system, which generally needs to integrate 2.4G band and 5G band, posing new challenges to low-cost and small-area receivers.

[0003] Because different frequency bands have different requirements for the input matching of the RF receiver and the local oscillator clock of the down-conversion, independent channel designs are generally performed. This leads to an increase in the integration area. On the one hand, passive devices occupy a large area in the current CMOS integration process. On the other hand, local oscillator signals of different frequency bands need to be routed separately, occupying wider chip lines, increasing the chip area and cost. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a dual-band wireless transceiver circuit, a radio frequency transceiver module and a radio frequency transceiver. The dual-band receiving circuit and the dual-band transmitting circuit in the dual-band wireless transceiver circuit of the present application share a dual-band common module, and there is no need to design channels for the high frequency band and the low frequency band respectively. The output driving circuit provides a local oscillator clock for the dual-band receiving circuit, and the calibration excitation source driving circuit provides a local oscillator clock for the dual-band transmitting circuit. There is no need to design separate channels for different frequency bands, which effectively reduces the number of components and reduces chip area and cost.

[0005] To achieve the above objectives, the present application provides the following technical solutions:

[0006] A dual-band wireless transceiver circuit, comprising:

[0007] Dual-band receiving circuit, dual-band transmitting circuit, dual-band common module, calibration excitation source, calibration excitation source driving circuit, output driving circuit and frequency synthesizer;

[0008] The dual-band receiving circuit is used to send a receiving signal to the dual-band shared module when the dual-band wireless transceiver circuit is in a receiving state, so that the dual-band shared module uses the first local oscillator clock processed by the output drive circuit to process the receiving signal, and uses the calibration source signal provided by the calibration excitation source to perform mirror calibration;

[0009] The output driving circuit processes the local oscillator clock generated by the frequency synthesizer and outputs the processed first local oscillator clock;

[0010] The dual-band transmitting circuit is used to send a transmitting signal to the dual-band shared module when the dual-band wireless transceiver circuit is in a transmitting state, so that the dual-band shared module processes the transmitting signal and uses the second local oscillator clock processed by the calibration excitation source driving circuit to perform local oscillator leakage calibration;

[0011] The calibration excitation source driving circuit processes the local oscillator clock provided by the calibration excitation source, and outputs a processed second local oscillator clock.

[0012] The above dual-band wireless transceiver circuit, optionally, the dual-band receiving circuit includes: a high-band receiving circuit and a low-band receiving circuit; the dual-band transmitting circuit includes: a low-band transmitting circuit and a high-band transmitting circuit;

[0013] When the high-frequency band receiving circuit is in a working state, the output of the low-frequency band receiving circuit is in a high-impedance state, and the high-frequency band receiving circuit in a working state is used to receive a high-frequency signal in a high-frequency band, and output a receiving signal after processing the received high-frequency signal;

[0014] When the low-frequency band receiving circuit is in a working state, the output of the high-frequency band receiving circuit is in a high-impedance state. The low-frequency band receiving circuit in a working state is used to receive a low-frequency signal in a low-frequency band, and output a receiving signal after processing the received low-frequency signal;

[0015] When the low-frequency band transmitting circuit is in working state, the dual-frequency band receiving circuit is not in working state, and the first attenuation array in the low-frequency band transmitting circuit is in working state, the transmitting signal processed by the first attenuation array is sent to the dual-frequency common module;

[0016] When the high-band transmitting circuit is in operation, the dual-band receiving circuit is not in operation, and the second attenuation array in the high-band transmitting circuit is in operation, and the transmitting signal processed by the second attenuation array is sent to the dual-band shared module.

[0017] The above-mentioned dual-band wireless transceiver circuit can, optionally, when the high-frequency band receiving circuit is in a working state, the calibration excitation source provides a calibration source signal to the dual-band shared module through the high-frequency band receiving circuit; when the low-frequency band receiving circuit is in a working state, the calibration excitation source provides a calibration source signal to the dual-band shared module through the low-frequency band receiving circuit.

[0018] The above dual-band wireless transceiver circuit, optionally, the output drive circuit includes:

[0019] A low-frequency band driving circuit and a high-frequency band driving circuit;

[0020] The process in which the output driving circuit processes the local oscillator clock generated by the frequency synthesizer and outputs the processed first local oscillator clock includes:

[0021] When the high-frequency band receiving circuit is in working state, the low-frequency band driving circuit and the high-frequency band driving circuit in the output driving circuit are both in working state, and the local oscillator clock generated by the frequency synthesizer is processed by using the low-frequency band driving circuit and the high-frequency band driving circuit in working state, and the processed first local oscillator clock is output;

[0022] When the low-frequency band receiving circuit is in a working state, the low-frequency band driving circuit is in a working state, and the high-frequency band driving circuit is not in a working state, the low-frequency band driving circuit in a working state is used to process the local oscillator clock generated by the frequency synthesizer, and the processed first local oscillator clock is output.

[0023] The above dual-band wireless transceiver circuit, optionally, the calibration excitation source driving circuit includes:

[0024] A calibration excitation source high-frequency band driving circuit and a calibration excitation source low-frequency band driving circuit;

[0025] The process in which the calibration excitation source driving circuit processes the local oscillator clock provided by the calibration excitation source and outputs the processed second local oscillator clock includes:

[0026] When the high-frequency band transmitting circuit is in working state, the calibration excitation source high-frequency band driving circuit and the calibration excitation source low-frequency band driving circuit are both in working state, and the calibration excitation source high-frequency band driving circuit and the calibration excitation source low-frequency band driving circuit in working state are used to process the local oscillator clock provided by the calibration excitation source, and output the processed second local oscillator clock;

[0027] When the low-frequency band transmitting circuit is in a working state, the low-frequency band driving circuit of the calibration excitation source is in a working state, and the high-frequency driving circuit of the calibration excitation source is not in a working state, the local oscillator clock provided by the calibration excitation source is processed using the working low-frequency band driving circuit of the calibration excitation source, and the processed second local oscillator clock is output.

[0028] The above dual-band wireless transceiver circuit, optionally, the dual-band shared module includes:

[0029] The first single-to-double conversion balun, variable capacitor, mixer, analog filter, analog-to-digital converter, and digital baseband;

[0030] When the dual-band wireless transceiver circuit is in a receiving state, the variable capacitor is used to adjust the capacitance value according to the working mode of the dual-band receiving circuit, so that the input and output resonance of the dual-band receiving circuit satisfies the frequency band interval corresponding to the working mode of the dual-band receiving circuit; the working mode of the dual-band receiving circuit is a first high-frequency band working mode or a first low-frequency band working mode; the first high-frequency band working mode is the mode when the high-frequency band receiving circuit is in a working state, and the first low-frequency band working mode is the mode when the low-frequency band receiving circuit is in a working state;

[0031] The process in which the dual-band sharing module uses the first local oscillator clock processed by the output driving circuit to process the received signal and uses the calibration source signal provided by the calibration excitation source to perform mirror calibration includes:

[0032] The first single-to-double conversion balun converts the received signal into a differential signal; the mixer down-converts the differential signal based on the first local oscillator clock and outputs a first down-converted signal; the analog filter filters and shapes the first down-converted signal and outputs a first baseband analog signal; the analog-to-digital converter samples and quantizes the first baseband analog signal and outputs a first sampled quantized signal; the digital baseband demodulates the first sampled quantized signal and uses the calibration source signal for mirror calibration.

[0033] The above-mentioned dual-band wireless transceiver circuit, optionally, when the dual-band wireless transceiver circuit is in a transmitting state, the variable capacitor is in a resonant state corresponding to the working mode of the dual-band transmitting circuit; the working mode of the dual-band transmitting circuit is a second high-frequency band working mode or a second low-frequency band working mode; the second high-frequency band working mode is when the high-frequency band transmitting circuit is in a working mode, and the second low-frequency band working mode is when the low-frequency band transmitting circuit is in a working mode;

[0034] The process in which the dual-band common module processes the transmission signal and uses the second local oscillator clock processed by the calibration excitation source driving circuit to perform local oscillator leakage calibration includes:

[0035] The mixer performs down-conversion processing on the transmission signal and outputs a second down-converted signal; the analog filter performs filtering and shaping on the second down-converted signal and outputs a second baseband analog signal; the analog-to-digital converter samples and quantizes the second baseband analog signal and outputs a second sampled quantized signal; the digital baseband demodulates the second sampled quantized signal and uses the second local oscillator clock to perform local oscillator leakage calibration.

[0036] In the above-mentioned dual-band wireless transceiver circuit, optionally, the calibration excitation source is a ring oscillator.

[0037] A radio frequency transceiver module comprises the above-mentioned dual-band wireless transceiver circuit.

[0038] A radio frequency transceiver comprises the radio frequency transceiver module mentioned above.

[0039] Compared with the prior art, this application has the following advantages:

[0040] The dual-band wireless transceiver circuit provided in the embodiment of the present application includes a dual-band receiving circuit, a dual-band transmitting circuit, a dual-band shared module, a calibration excitation source, a calibration excitation source driving circuit, an output driving circuit and a frequency synthesizer; wherein the dual-band receiving circuit and the dual-band transmitting circuit share the dual-band shared module, and the calibration excitation source driving circuit provides high-band and low-band local oscillator clocks for the dual-band transmitting circuit, and the output driving circuit provides high-band and low-band local oscillator clocks for the dual-band receiving circuit, thereby eliminating the need to design separate lines for different frequency bands, reducing the use of devices, and further reducing the area and cost of the chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0042] Figure 1 A schematic diagram of the structure of a dual-band wireless transceiver circuit provided in an embodiment of the present application;

[0043] Figure 2 A schematic diagram of the structure of another dual-band wireless transceiver circuit provided in an embodiment of the present application;

[0044] Figure 3 A schematic diagram of the structure of another dual-band wireless transceiver circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0047] In order to solve the problems in the background technology, the present application provides a dual-band wireless transceiver circuit, which includes a dual-band receiving circuit, a dual-band transmitting circuit, a dual-band shared module, a calibration excitation source, a calibration excitation source driving circuit, an output driving circuit and a frequency synthesizer; the dual-band receiving circuit and the dual-band transmitting circuit in the circuit share the dual-band shared module, and there is no need to design channels for the high frequency band and the low frequency band respectively. The output driving circuit provides a local oscillator clock for the dual-band receiving circuit, and the calibration excitation source driving circuit provides a local oscillator clock for the dual-band transmitting circuit. There is no need to design separate channels for different frequency bands, which effectively reduces the number of components and reduces the chip area and cost.

[0048] Reference Figure 1 , is a schematic diagram of the structure of a dual-band wireless transceiver circuit provided in an embodiment of the present application, and is specifically described as follows:

[0049] The dual-band wireless transceiver circuit includes: a dual-band receiving circuit 101, a dual-band transmitting circuit 102, a dual-band shared module 103, a calibration excitation source 104, a calibration excitation source driving circuit 105, an output driving circuit 106 and a frequency synthesizer 107; wherein, the dual-band transmitting circuit 102 includes two parts 102a and 102b in the figure.

[0050] A dual-band receiving circuit, used for sending a receiving signal to the dual-band shared module when the dual-band wireless transceiver circuit is in a receiving state, so that the dual-band shared module uses the first local oscillator clock processed by the output drive circuit to process the receiving signal, and uses the calibration source signal provided by the calibration excitation source to perform mirror calibration;

[0051] The output driving circuit processes the first local oscillator clock generated by the frequency synthesizer and outputs the processed first local oscillator clock;

[0052] A dual-band transmitting circuit, used for sending a transmitting signal to the dual-band shared module when the dual-band wireless transceiver circuit is in a transmitting state, so that the dual-band shared module processes the transmitting signal and performs local oscillator leakage calibration using a second local oscillator clock processed by the calibration excitation source driving circuit;

[0053] The calibration excitation source driving circuit processes the second local oscillator clock provided by the calibration excitation source, and outputs the processed second local oscillator clock.

[0054] The dual-band wireless transceiver circuit provided in the embodiment of the present application includes a dual-band receiving circuit, a dual-band transmitting circuit, a dual-band shared module, a calibration excitation source, a calibration excitation source driving circuit, an output driving circuit and a frequency synthesizer; wherein the dual-band receiving circuit and the dual-band transmitting circuit share the dual-band shared module, and the calibration excitation source driving circuit provides high-band and low-band local oscillator clocks for the dual-band transmitting circuit, and the output driving circuit provides high-band and low-band local oscillator clocks for the dual-band receiving circuit, thereby eliminating the need to design separate lines for different frequency bands, reducing the use of devices, and further reducing the area and cost of the chip.

[0055] Reference Figure 2 , is a schematic diagram of the structure of another dual-band wireless transceiver circuit provided in an embodiment of the present application, according to Figure 2 The connection of each component of the dual-band wireless transceiver circuit is described as follows:

[0056] like Figure 2 As shown, the dual-band receiving circuit 101 includes a low-band receiving circuit 201 and a high-band receiving circuit 202. The low-band receiving circuit is used to receive a low-frequency signal, which may be a signal with a frequency lower than a certain frequency; the high-band receiving circuit is used to receive a high-frequency signal, which may be a signal with a frequency higher than a certain value.

[0057] The low-frequency band receiving circuit includes a first inductor L1, a first low-noise amplifier LNA1 and a first switch S1, wherein the first end of the first inductor and one end of the first switch are both connected to the negative input end of the first low-noise amplifier, and the other end of the first switch is grounded. The high-frequency band receiving circuit includes a second inductor L2, a second low-noise amplifier LNA2 and a second switch S2, wherein the first end of the second inductor and one end of the second switch are both connected to the negative input end of the second low-noise amplifier, and the other end of the second switch is grounded. The low-frequency band receiving circuit can be regarded as the first main channel RX1, and the high-frequency band receiving circuit can be regarded as the second main channel RX2.

[0058] like Figure 2As shown, the dual-band transmitting circuit 102 includes a low-band transmitting circuit 102b and a high-band transmitting circuit 102a; the low-band transmitting circuit includes a first transformer B1, a first attenuator array ATT1, and a first power amplifier PA1; the first end of the first transformer and the first end of the first attenuator array are both connected to the negative output end of the first power amplifier, the second end of the first transformer and the second end of the first attenuator array are both connected to the positive output end of the first power amplifier, the third end of the first transformer is connected to the second end of the first inductor, and the fourth end of the first transformer is grounded. The high-band transmitting circuit includes a second transformer B2, a second attenuator array ATT2, and a second power amplifier PA2; the first end of the second transformer and the first end of the second attenuator array are both connected to the negative output end of the second power amplifier, the second end of the second transformer and the second end of the second attenuator array are both connected to the positive output end of the second power amplifier, the third end of the second transformer is connected to the second end of the second inductor, and the fourth end of the second transformer is grounded. The low-band transmitting circuit can be regarded as a low-band transmitting channel TX1, and the high-band transmitting circuit can be regarded as a high-band transmitting channel TX2.

[0059] The dual-band shared module 103 includes: a first single-to-double conversion balun B3, a variable capacitor C1, a mixer Mixer, an analog filter ABB, an analog-to-digital converter ADC and a digital baseband DigitalBB; wherein the mixer, the analog filter, the analog-to-digital converter and the digital baseband are connected in series in sequence; the first end of the first single-to-double conversion balun is connected to the output end of the first low-noise amplifier, the second end is connected to the output end of the second low-noise amplifier, the third end is connected to the first end of the variable capacitor, the fourth end is connected to the second end of the variable capacitor, and the fifth end is connected to the power supply, i.e., VDD; the first end of the variable capacitor is connected to the mixer, and the second end is connected to the mixer.

[0060] The calibration excitation source driving circuit 105 includes a calibration excitation source high-frequency band driving circuit 203 and a calibration excitation source low-frequency band driving circuit 204; one end of the calibration excitation source high-frequency band driving circuit is connected to one end of the calibration excitation source, and the other end of the calibration excitation source high-frequency band driving circuit is connected to the mixer through a third switch S3; one end of the calibration excitation source low-frequency band driving circuit is connected to one end of the calibration excitation source, and the other end of the calibration excitation source low-frequency band driving circuit is connected to the mixer through a fourth switch S4.

[0061] The output driving circuit 106 includes: a low-band driving circuit 205 and a high-band driving circuit 206; one end of the low-band driving circuit is connected to the mixer, and the other end is connected to the frequency synthesizer SX; one end of the high-band driving circuit is connected to the mixer, and the other end is connected to the frequency synthesizer SX. The low-band driving circuit can be expressed as: L Band Buffer; the high-band driving circuit can be expressed as: H Band Buffer.

[0062] Furthermore, the first attenuator array of the low-band transmitting circuit is connected to the mixer via a fifth switch S5, and the second attenuator array of the high-band transmitting circuit is connected to the mixer via a sixth switch S6.

[0063] The positive input terminal of the first low-noise amplifier in the low-frequency band receiving circuit is connected to the calibration excitation source TTG through the seventh switch S7; the positive input terminal of the second low-noise amplifier in the high-frequency band receiving circuit is connected to the calibration excitation source TTG through the eighth switch S8; preferably, the calibration excitation source of the present application is a ring oscillator.

[0064] The above is a connection description of each device in the dual-band wireless transceiver circuit provided in an embodiment of the present application. From the above content, it can be seen that the dual-band wireless transceiver circuit provided in the present application combines RF passive devices of different high frequency bands and the channel module after the mixer, and a single frequency synthesizer can generate a dual-frequency local oscillator signal to reduce the chip area. On the other hand, the independent connection of the multi-band low-frequency amplifier and power amplifier is retained, without additionally increasing the load effect of the transmitter, and a dual-frequency test tone generation module (TTG) is used to calibrate the transceiver channel to improve the calibration effect.

[0065] The embodiment of the present application also provides for calibrating the transceiver channel of the dual-band transceiver circuit to improve the calibration effect. The calibration includes mirror calibration and local oscillator leakage calibration. By calibrating the circuit, the accuracy of the circuit output signal and the performance of the circuit are improved.

[0066] Reference Figure 3 , which is a schematic diagram of the structure of another dual-band wireless transceiver circuit provided in an embodiment of the present application. The connection instructions of the related components in this figure can be referred to Figure 2 , Figure 3 and Figure 2 compared to, Figure 3 There are additional antenna ports (ANT) and duplexers (Diplexer). The second end of the first inductor and the second end of the second inductor are both connected to the duplexer to receive signals. ,in, is the total inductance of the secondary coil of the first single-double conversion balun; The inductance of the primary coil part of the first single-double conversion balun - low frequency measurement; The inductance of the primary coil of the first single-double conversion balun - high frequency band measurement; + is the total inductance of the primary coil of the first single-to-double conversion balun. Further, the dual-band wireless transceiver circuit provided by the present application is integrated in a system-on-chip (SOC). Further, the dual-band wireless transceiver circuit provided by the present application is also applied in a radio frequency transceiver module, and the radio frequency transceiver can also apply a radio frequency transceiver module that integrates the dual-band wireless transceiver circuit provided by the present application.

[0067] Reference Figure 3 , the process of calibrating the dual-band wireless transceiver circuit provided in this application is described, and the calibration includes mirror calibration and local oscillator leakage calibration.

[0068] For example, the mirror calibration is first described as follows:

[0069] When the dual-band wireless transceiver circuit is in a receiving state, it means that the high-band receiving circuit or the low-band receiving circuit is in a working state. At this time, the receiving circuit in a working state sends a receiving signal to the dual-band sharing module, so that the dual-band sharing module uses the first local oscillator clock processed by the output driving circuit to process the receiving signal, and uses the calibration source signal provided by the calibration excitation source for mirror calibration.

[0070] Specifically, when the low-frequency band receiving circuit is in the working state, the output of the high-frequency band receiving circuit is in the high-impedance state, specifically, the first switch S1 is in the off state, the second low noise amplifier LNA2 is turned off, and the output of the high-frequency band receiving circuit is in the high-impedance state; the low-frequency band receiving circuit in the working state is used to receive the low-frequency signal in the low frequency band, the low-frequency signal is amplified by the first low noise amplifier LNA1 after passing through the first inductor L1, and then the receiving signal is output, preferably, by adjusting the variable capacitor C1, the input and output resonance of the first low noise amplifier LNA1 is controlled to be within the low frequency band interval (L Band), so as to ensure sufficient gain to suppress the noise of the subsequent circuit. It can be understood that when the low-frequency band receiving circuit is in the working state, the working mode of the dual-band receiving circuit is the first low frequency band working mode, and the variable capacitor C1 is adjusted so that the input and output resonance of the first low noise amplifier are within the frequency band interval of the first low frequency band working mode, that is, the low frequency band interval, and the frequency band interval can be set.

[0071] Then, under the single-to-double conversion action of the first single-to-double conversion balun, the single-ended received signal is converted into a differential signal that is resistant to common-mode interference. The mixer down-converts the differential signal based on the first local oscillator clock and outputs a first down-converted signal. The analog filter filters and shapes the first down-converted signal and outputs a first baseband analog signal. The analog-to-digital converter samples and quantizes the first baseband analog signal and outputs a first sampled quantized signal. The digital baseband demodulates the first sampled quantized signal and uses the calibration source signal for mirror calibration.

[0072] Furthermore, when the low-frequency band receiving circuit is in operation, the low-frequency driving requirement is low, and therefore, only the L Band Buffer needs to be turned on. Even if the low-frequency band driving circuit is in operation and the high-frequency band driving circuit is not in operation, the low-frequency band driving circuit in operation is used to process the local oscillator clock generated by the frequency synthesizer, and the processed first local oscillator clock is output. Furthermore, at this time, the local oscillator clock LO generated by the frequency synthesizer is a low-frequency band signal, and at this time, the output driving circuit uses the low-frequency band driving circuit to process the signal, that is, only part of the circuit is used to process the local oscillator clock. The third switch S3 and the fourth switch S4 are in the disconnected state, which can reduce power consumption.

[0073] Among them, the calibration excitation source provides a calibration source signal to the dual-band shared module through the low-band receiving circuit. Furthermore, when the low-band receiving circuit is in working state, the seventh switch S7 is closed, the eighth switch S8 is opened, and the small-area ring oscillator TTG (i.e., the calibration excitation source) generates a corresponding dual-band excitation source (i.e., the calibration source signal), and then enters the low-band receiving circuit (which can also be regarded as the first main channel RX1) through the seventh switch S7, so that the down-conversion amplitude and phase error of the low-frequency channel of the dual-band transceiver circuit in each chip can be captured, and mirror compensation is performed in the digital baseband to complete the mirror calibration, which can also be called the mirror calibration of the low-band main channel. Therefore, when the chip is turned on, the error of each chip can be captured, and the dual-band transceiver circuit integrated in each chip can be mirror-calibrated, so that each chip can be calibrated to the optimal state.

[0074] Specifically, when the high-frequency band receiving circuit is in the working state, the output of the low-frequency band receiving circuit is in the high-impedance state, specifically, the second switch S2 is in the off state, the first low noise amplifier LNA1 is turned off, and the output of the low-frequency band receiving circuit is in the high-impedance state; the high-frequency band receiving circuit in the working state is used to receive the high-frequency signal in the high-frequency band, the high-frequency signal is amplified by the second low noise amplifier LNA2 after passing through the first inductor L1, and then the receiving signal is output. Preferably, by adjusting the variable capacitor C1, the input and output resonance of the second low noise amplifier LNA2 is controlled to be within the high-frequency band interval (H Band), and the high-frequency band interval can be set by itself or according to the definition of the high and low frequency, so as to ensure sufficient gain to suppress the noise of the subsequent circuit. It can be understood that when the high-frequency band receiving circuit is in the working state, the working mode of the dual-band receiving circuit is the first high-frequency band working mode, and the variable capacitor C1 is adjusted so that the input and output resonance of the second low noise amplifier are within the frequency band interval of the first high-frequency band working mode, that is, the high-frequency band interval, and the frequency band interval can be set.

[0075] Then, under the single-to-double conversion action of the first single-to-double conversion balun, the single-ended received signal is converted into a differential signal that is resistant to common-mode interference. The mixer down-converts the differential signal based on the first local oscillator clock and outputs a first down-converted signal. The analog filter filters and shapes the first down-converted signal and outputs a first baseband analog signal. The analog-to-digital converter samples and quantizes the first baseband analog signal and outputs a first sampled quantized signal. The digital baseband demodulates the first sampled quantized signal and uses the calibration source signal for mirror calibration.

[0076] Furthermore, when the high-band receiving circuit is in operation, because the H Band frequency is relatively high and has high driving requirements, the L Band Buffer and the H Band Buffer need to be turned on. Even if the low-band driving circuit and the high-band driving circuit in the output driving circuit are both in operation, the low-band driving circuit and the high-band driving circuit in operation are used to process the local oscillator clock generated by the frequency synthesizer, and the processed first local oscillator clock is output. Furthermore, at this time, the local oscillator clock LO generated by the frequency synthesizer is a high-band signal. At this time, the low-band driving circuit and the high-band driving circuit in the output driving circuit need to process the signal at the same time, that is, the output driving circuit at this time uses the completed circuit to process the local oscillator clock, and the third switch S3 and the fourth switch S4 are in the disconnected state, which can ensure sufficient driving capability.

[0077] Among them, the calibration excitation source provides the calibration source signal to the dual-band shared module through the high-frequency band receiving circuit. Further, when the high-frequency band receiving circuit is in working state, the seventh switch S7 is disconnected, the eighth switch S8 is closed, and the small-area ring oscillator TTG (i.e., the calibration excitation source) generates the corresponding dual-band excitation source (i.e., the calibration source signal), and then enters the high-frequency band receiving circuit (also regarded as the second main channel RX2) through the eighth switch S8, so as to capture the down-conversion amplitude and phase error of the high-frequency channel of each chip, and perform mirror compensation in the digital baseband, thereby completing the mirror calibration. This mirror calibration can also be called the mirror calibration of the high-frequency band main channel.

[0078] Exemplarily, the local oscillator leakage calibration is described, and the specific description is as follows:

[0079] When the dual-band wireless transceiver circuit is in the transmitting state, it means that the high-band transmitting circuit or the low-band transmitting circuit is in the working state. At this time, the transmitting circuit in the working state sends a transmitting signal to the dual-band shared module, so that the dual-band shared module processes the transmitting signal and uses the second local oscillator clock processed by the calibrated excitation source driving circuit to perform local oscillator leakage calibration.

[0080] Furthermore, when the dual-band wireless transceiver circuit is in the transmitting state, the first switch S1 and the second switch S2 are both in a closed and grounded state, and the first low-noise amplifier and the second low-noise amplifier are both in a closed state. In other words, the dual-band receiving circuit is not in a working state, which can reduce the leakage of transmission power to the output end of the low-noise amplifier.

[0081] Specifically, when the low-frequency band transmitting circuit is in a working state, the working mode of the dual-frequency band transmitting circuit is a second low-frequency band working mode, the fifth switch S5 is in a closed state, the sixth switch S6 is in an open state, and the first attenuation array in the low-frequency band transmitting circuit is in a working state, and the transmission signal processed by the first attenuation array is sent to the dual-frequency sharing module through the fifth switch.

[0082] The variable capacitor in the dual-band shared module is in a resonant state corresponding to the working mode of the dual-band transmitting circuit, that is, the variable capacitor is adjusted to a resonant state corresponding to the second low-frequency band working mode, so that the input and output resonance of the low-frequency band transmitting circuit is within the low-frequency band range, and the low-frequency band range can be set by itself.

[0083] The mixer in the dual-band shared module performs down-conversion processing on the transmission signal and outputs a second down-conversion signal; the analog filter filters and shapes the second down-conversion signal and outputs a second baseband analog signal; the analog-to-digital converter samples and quantizes the second baseband analog signal and outputs a second sampled quantization signal; the digital baseband demodulates the second sampled quantization signal and uses the second local oscillator clock to perform local oscillator leakage calibration.

[0084] Furthermore, when the low-frequency band transmitting circuit is in a working state, the low-frequency band driving circuit of the calibration excitation source is in a working state, and the high-frequency driving circuit of the calibration excitation source is not in a working state, the low-frequency band driving circuit of the calibration excitation source in a working state is used to process the local oscillator clock provided by the calibration excitation source, and the processed second local oscillator clock is output.

[0085] Specifically, when the high-frequency band transmitting circuit is in a working state, the working mode of the dual-frequency band transmitting circuit is a second high-frequency band working mode, the fifth switch S5 is in a disconnected state, the sixth switch S6 is in a closed state, and the second attenuation array in the high-frequency band transmitting circuit is in a working state, and the transmission signal processed by the second attenuation array is sent to the dual-frequency sharing module through the sixth switch.

[0086] The variable capacitor in the dual-band shared module is in a resonant state corresponding to the working mode of the dual-band transmitting circuit, that is, the variable capacitor is adjusted to a resonant state corresponding to the second high-frequency band working mode, so that the input and output resonance of the high-frequency band transmitting circuit is within the high-frequency band range, and the high-frequency band range can be set by itself.

[0087] The mixer in the dual-band shared module performs down-conversion processing on the transmission signal and outputs a second down-conversion signal; the analog filter filters and shapes the second down-conversion signal and outputs a second baseband analog signal; the analog-to-digital converter samples and quantizes the second baseband analog signal and outputs a second sampled quantization signal; the digital baseband demodulates the second sampled quantization signal and uses the second local oscillator clock to perform local oscillator leakage calibration.

[0088] Furthermore, when the high-frequency band transmitting circuit is in a working state, the calibration excitation source high-frequency band driving circuit and the calibration excitation source low-frequency band driving circuit are both in a working state, and the calibration excitation source high-frequency band driving circuit and the calibration excitation source low-frequency band driving circuit in a working state are used to process the local oscillator clock provided by the calibration excitation source, and output the processed second local oscillator clock; when the calibration excitation source high-frequency band driving circuit and the calibration excitation source low-frequency band driving circuit are both in a working state, the driving capability can be increased.

[0089] In the present application, the purpose of using the calibration excitation source TTG as the local oscillator clock LO is to make the local oscillator leakage LO Leakage of the transmitting circuit TX be at a low frequency position after down-conversion through the loopback channel. Therefore, at this time, the LO up-conversion source of the transmitting circuit TX is also the frequency synthesizer SX. If the frequency synthesizer SX is used as the local oscillator clock LO of the loopback channel, the local oscillator leakage LO Leakage after down-conversion can only be at the digital conversion DC, thereby increasing the quantization accuracy requirements of the analog-to-digital converter ADC.

[0090] In the wireless transceiver circuit provided by the present application, a set of passive components and mixers are shared by dual frequency bands, which can reduce the area of ​​the receiving channel on the chip; the dual frequency bands of the frequency synthesizer are combined into a single output, which reduces the number of LO Path routings, reduces the occupied width of the line on the chip and simplifies the layout of the transceiver; a ring oscillator is used as a TTG circuit, which has a smaller area and can be flexibly placed according to the chip layout, and can effectively calibrate the IR for both high and low frequency band receivers; the calibration excitation source uses a ring oscillator to generate dual frequency bands, which can be combined into one local oscillator source sent to the mixer as the LO Leakage calibration local oscillator source of the dual frequency band transmitting circuit, which can avoid the DC capture inaccuracy problem after the loop channel down-conversion, that is, reduce the requirements for the high effective bit ADC, thereby improving the calibration accuracy, and the high and low frequencies can also be sent to the dual frequency band receiving circuit respectively for calibration of image suppression.

[0091] Although the present invention depicts operations in a particular order, this should not be understood as requiring that the operations be performed in the particular order shown or in a sequential order.Multitasking and parallel processing may be advantageous under certain circumstances.

[0092] It should be understood that the various steps described in the method embodiments of the present disclosure may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present disclosure is not limited in this respect.

[0093] It should be noted that the information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards in the relevant regions.

[0094] The specific implementation processes and derivative methods of the above-mentioned embodiments are all within the protection scope of the present invention.

[0095] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0096] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0097] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dual-band wireless transceiver circuit, characterized in that: include: Dual-band receiving circuit, dual-band transmitting circuit, dual-band common module, calibration excitation source, calibration excitation source driving circuit, output driving circuit and frequency synthesizer; The dual-band receiving circuit is used to send a receiving signal to the dual-band shared module when the dual-band wireless transceiver circuit is in a receiving state, so that the dual-band shared module uses the first local oscillator clock processed by the output drive circuit to process the receiving signal, and uses the calibration source signal provided by the calibration excitation source to perform mirror calibration; The output driving circuit processes the local oscillator clock generated by the frequency synthesizer and outputs the processed first local oscillator clock; The dual-band transmitting circuit is used to send a transmitting signal to the dual-band shared module when the dual-band wireless transceiver circuit is in a transmitting state, so that the dual-band shared module processes the transmitting signal and uses the second local oscillator clock processed by the calibration excitation source driving circuit to perform local oscillator leakage calibration; The calibration excitation source driving circuit processes the local oscillator clock provided by the calibration excitation source, and outputs a processed second local oscillator clock.

2. The dual-band wireless transceiver circuit according to claim 1, characterized in that: The dual-band receiving circuit includes: a high-band receiving circuit and a low-band receiving circuit; the dual-band transmitting circuit includes: a low-band transmitting circuit and a high-band transmitting circuit; When the high-frequency band receiving circuit is in a working state, the output of the low-frequency band receiving circuit is in a high-impedance state, and the high-frequency band receiving circuit in a working state is used to receive a high-frequency signal in a high-frequency band, and output a receiving signal after processing the received high-frequency signal; When the low-frequency band receiving circuit is in a working state, the output of the high-frequency band receiving circuit is in a high-impedance state. The low-frequency band receiving circuit in a working state is used to receive a low-frequency signal in a low-frequency band, and output a receiving signal after processing the received low-frequency signal; When the low-frequency band transmitting circuit is in working state, the dual-frequency band receiving circuit is not in working state, and the first attenuation array in the low-frequency band transmitting circuit is in working state, the transmitting signal processed by the first attenuation array is sent to the dual-frequency common module; When the high-band transmitting circuit is in operation, the dual-band receiving circuit is not in operation, and the second attenuation array in the high-band transmitting circuit is in operation, and the transmitting signal processed by the second attenuation array is sent to the dual-band shared module.

3. The dual-band wireless transceiver circuit according to claim 2, characterized in that: When the high-frequency band receiving circuit is in working state, the calibration excitation source provides a calibration source signal to the dual-band sharing module through the high-frequency band receiving circuit; when the low-frequency band receiving circuit is in working state, the calibration excitation source provides a calibration source signal to the dual-band sharing module through the low-frequency band receiving circuit.

4. The dual-band wireless transceiver circuit according to claim 2, characterized in that: The output drive circuit comprises: A low-frequency band driving circuit and a high-frequency band driving circuit; The process in which the output driving circuit processes the local oscillator clock generated by the frequency synthesizer and outputs the processed first local oscillator clock includes: When the high-frequency band receiving circuit is in working state, the low-frequency band driving circuit and the high-frequency band driving circuit in the output driving circuit are both in working state, and the local oscillator clock generated by the frequency synthesizer is processed by using the low-frequency band driving circuit and the high-frequency band driving circuit in working state, and the processed first local oscillator clock is output; When the low-frequency band receiving circuit is in a working state, the low-frequency band driving circuit is in a working state, and the high-frequency band driving circuit is not in a working state, the low-frequency band driving circuit in a working state is used to process the local oscillator clock generated by the frequency synthesizer, and the processed first local oscillator clock is output.

5. The dual-band wireless transceiver circuit according to claim 2, characterized in that: The calibration excitation source driving circuit comprises: A calibration excitation source high-frequency band driving circuit and a calibration excitation source low-frequency band driving circuit; The process in which the calibration excitation source driving circuit processes the local oscillator clock provided by the calibration excitation source and outputs the processed second local oscillator clock includes: When the high-frequency band transmitting circuit is in working state, the calibration excitation source high-frequency band driving circuit and the calibration excitation source low-frequency band driving circuit are both in working state, and the calibration excitation source high-frequency band driving circuit and the calibration excitation source low-frequency band driving circuit in working state are used to process the local oscillator clock provided by the calibration excitation source, and output the processed second local oscillator clock; When the low-frequency band transmitting circuit is in a working state, the low-frequency band driving circuit of the calibration excitation source is in a working state, and the high-frequency band driving circuit of the calibration excitation source is not in a working state. The local oscillator clock provided by the calibration excitation source is processed using the working low-frequency band driving circuit of the calibration excitation source, and the processed second local oscillator clock is output.

6. The dual-band wireless transceiver circuit according to claim 2, characterized in that: The dual-band shared module comprises: The first single-to-double conversion balun, variable capacitor, mixer, analog filter, analog-to-digital converter, and digital baseband; When the dual-band wireless transceiver circuit is in a receiving state, the variable capacitor is used to adjust the capacitance value according to the working mode of the dual-band receiving circuit, so that the input and output resonance of the dual-band receiving circuit satisfies the frequency band interval corresponding to the working mode of the dual-band receiving circuit; the working mode of the dual-band receiving circuit is a first high-frequency band working mode or a first low-frequency band working mode; the first high-frequency band working mode is the mode when the high-frequency band receiving circuit is in a working state, and the first low-frequency band working mode is the mode when the low-frequency band receiving circuit is in a working state; The process in which the dual-band sharing module uses the first local oscillator clock processed by the output driving circuit to process the received signal and uses the calibration source signal provided by the calibration excitation source to perform mirror calibration includes: The first single-to-double conversion balun converts the received signal into a differential signal; the mixer down-converts the differential signal based on the first local oscillator clock and outputs a first down-converted signal; the analog filter filters and shapes the first down-converted signal and outputs a first baseband analog signal; the analog-to-digital converter samples and quantizes the first baseband analog signal and outputs a first sampled quantized signal; the digital baseband demodulates the first sampled quantized signal and uses the calibration source signal for mirror calibration.

7. The dual-band wireless transceiver circuit according to claim 6, characterized in that: When the dual-band wireless transceiver circuit is in a transmitting state, the variable capacitor is in a resonant state corresponding to the working mode of the dual-band transmitting circuit; the working mode of the dual-band transmitting circuit is a second high-frequency band working mode or a second low-frequency band working mode; the second high-frequency band working mode is when the high-frequency band transmitting circuit is in a working mode, and the second low-frequency band working mode is when the low-frequency band transmitting circuit is in a working mode; The process in which the dual-band common module processes the transmission signal and uses the second local oscillator clock processed by the calibration excitation source driving circuit to perform local oscillator leakage calibration includes: The mixer performs down-conversion processing on the transmission signal and outputs a second down-converted signal; the analog filter performs filtering and shaping on the second down-converted signal and outputs a second baseband analog signal; the analog-to-digital converter samples and quantizes the second baseband analog signal and outputs a second sampled quantized signal; the digital baseband demodulates the second sampled quantized signal and uses the second local oscillator clock to perform local oscillator leakage calibration.

8. The dual-band wireless transceiver circuit according to claim 1, characterized in that: The calibration excitation source is a ring oscillator.

9. A radio frequency transceiver module, characterized in that: The radio frequency transceiver module includes the dual-band wireless transceiver circuit according to any one of claims 1-8.

10. A radio frequency transceiver, characterized in that: The radio frequency transceiver comprises the radio frequency transceiver module according to claim 9.

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