CN111835379A

CN111835379A - Radio frequency transceiver and radio frequency transceiving system

Info

Publication number: CN111835379A
Application number: CN202010642643.1A
Authority: CN
Inventors: 罗素·莫恩; 刘瑞峰; 顾永如; 汤钧; 吴群; 喻士楷; 胡祥
Original assignee: Shanghai Orange Group Microelectronics Co ltd
Current assignee: Shanghai Orange Group Microelectronics Co ltd
Priority date: 2020-07-06
Filing date: 2020-07-06
Publication date: 2020-10-27

Abstract

The application discloses radio frequency transceiver and a radio frequency transceiving system includes: at least two transceiver modules working in different frequency bands, which are respectively used for transceiving radio frequency signals in different frequency bands and performing frequency conversion between the radio frequency signals and baseband signals; and the general signal processing module is connected with each transceiver module and is used for realizing the transmission and processing of baseband signals between each transceiver module and the modem. The radio frequency transceiver supports a plurality of frequency bands and has a simple structure.

Description

Radio frequency transceiver and radio frequency transceiving system

Technical Field

The present application relates to the field of communications technologies, and in particular, to a radio frequency transceiver and a radio frequency transceiving system.

Background

The time to market for a complex integrated circuit chip may be a determinant of the commercial failure or success of a new product. If the product is sold too late, a competitor may develop a new product, which, due to the pressure of the time of sale of the product, may be difficult to replace once a chip is selected and designed into a product. Also, the functional diversity of the chip is also very important, and users want to integrate more and more functions into a new SOC (system on chip) to reduce the number of chips and the overall cost. Integrating more functionality, however, will extend the design time required for development and verification, resulting in time-to-market for the entire chip. Furthermore, if the development team is small, such as in a pioneer company, the available engineering resources are limited, which is also a problem to be considered in the development progress of the whole chip.

The radio frequency transceiver is a structure necessary for performing wireless communication in the current electronic device, and how to provide a radio frequency transceiver design structure suitable for multiplexing multiple frequency bands by adopting more radio frequency bands in the current wireless communication is a problem to be solved urgently at present.

Disclosure of Invention

In view of this, the present application provides a radio frequency transceiver and a radio frequency transceiving system to increase the band application range of the transceiver and save the product design time.

The application provides a radio frequency transceiver, includes: at least two transceiver modules working in different frequency bands, which are respectively used for transceiving radio frequency signals in different frequency bands and performing frequency conversion between the radio frequency signals and baseband signals; and the general signal processing module is connected with each transceiver module and is used for realizing the transmission and processing of baseband signals between each transceiver module and the modem.

Optionally, the transceiver module includes: a receiving unit and a transmitting unit;

optionally, the general signal processing module includes: a general receiving processing unit connected with the output end of each receiving unit and a general transmitting processing unit connected with the receiving end of each transmitting unit.

Optionally, the general receiving and processing unit includes: an analog multiplexer and an analog-to-digital amplification converter; the analog multiplexer is coupled to the output end of each receiving unit and is used for selecting and outputting the signal output by one receiving unit; the output end of the analog multiplexer is coupled to the input end of the analog-to-digital amplification converter, and the analog-to-digital amplification converter is used for performing analog-to-digital amplification conversion processing on the signal output by the analog multiplexer and outputting the signal to the modem.

Optionally, the receiving unit includes: a low noise amplifier, a mixer coupled to the low noise amplifier, and a baseband amplifier coupled to the mixer, an output of the baseband amplifier being coupled to the analog multiplexer.

Optionally, the general receiving and processing unit further includes: a baseband amplifier coupled between the output of the analog multiplexer and the input of the analog-to-digital amplification converter, the output of the baseband amplifier being coupled to the analog-to-digital amplification converter.

Optionally, the receiving unit includes: a low noise amplifier, a mixer coupled to the low noise amplifier, an output of the mixer coupled to the analog multiplexer.

Optionally, the method further includes: and the gain detector is used for detecting the amplitude of the signal input to the analog-to-digital amplification converter, comparing the amplitude with an amplitude threshold value and outputting a corresponding detection signal to the modem according to the comparison result.

Optionally, the radio frequency transceiver is further configured to receive a gain control signal fed back by the modem according to the detection signal, and adjust the amplitude of the signal input to the analog-to-digital amplification converter according to the gain control signal.

Optionally, the sending unit includes a phase-locked loop, and a power amplifier coupled to an output of the phase-locked loop.

Optionally, the general sending and processing unit includes: and the digital multiplexer is coupled to the input end of each transmitting unit and is used for transmitting the modulation signal to be transmitted to the transmitting unit corresponding to one of the frequency bands.

Optionally, the digital multiplexer and the analog multiplexer are configured to receive a frequency band selection signal sent by the modem to select a corresponding frequency band.

Optionally, the phase-locked loop is configured to provide a local oscillation signal to a mixer in the receiving unit, and the phase-locked loop is configured to lock a frequency of the local oscillation signal according to a frequency-locked signal sent by a modem.

The technical solution of the present invention also provides a radio frequency transceiving system, including: a radio frequency transceiver as claimed in any one of the above; the radio frequency transceiver is connected to the modem through a single interface.

The radio frequency transceiver of this application designs transceiver module respectively to the radio frequency signal of different frequency channels, designs the general signal processing module of sharing to baseband signal, satisfies under the requirement of different frequency channel working property, reduces the quantity of device, can reduce chip area to, this transceiver structure can be multiplexed in multiple frequency channels, reduces the design cycle of product.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a radio frequency transceiver according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a radio frequency transceiver according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a radio frequency transceiver according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a radio frequency transceiver according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a radio frequency transceiving system according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the accompanying drawings, 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. The following embodiments and their technical features may be combined with each other without conflict.

The invention provides a novel radio frequency transceiver which can be suitable for a plurality of frequency bands, and the radio frequency transceiver comprises at least two transceiver modules working in different frequency bands and used for transceiving radio frequency signals in different frequency bands and performing frequency conversion between the radio frequency signals and baseband signals. The radio frequency transceiver also comprises a general signal processing module which is connected with each transceiver module and is used for transmitting and processing the baseband signals transmitted between the transceiver module and the modem.

Fig. 1 is a schematic structural diagram of a radio frequency transceiver according to an embodiment of the present invention.

In this embodiment, the rf transceiver includes a transceiver module 110, a transceiver module 120, and a general signal processing module 130.

The transceiver module 110 and the transceiver module 120 are respectively used for receiving and transmitting radio frequency signals of different frequency bands. In one embodiment, the transceiver module 110 is used for receiving and transmitting signals in the ISM band of 2.4GHz, and the transceiver module 120 is used for receiving and transmitting signals in the ISM band of 5.8 GHz. The transceiver module 110 and the transceiver module 120 are configured to convert the received radio frequency signal into a baseband signal, and convert the baseband signal into a radio frequency signal and transmit the radio frequency signal. The transceiver module 110 and the transceiver module 120 are both coupled to a general signal processing module 130.

The general signal processing module 130 is a common module of the whole rf transceiver, and is capable of transmitting and processing the baseband signal on the receiving or transmitting link of the transceiver module 110 or the transceiver module 120, where the processing includes analog and digital signal conversion, and specifically includes converting the baseband signal output by the transceiver module 110 or the transceiver module 120 into a digital signal and outputting the digital signal to a modem, and converting the digital modulation signal input by the modem into a baseband signal through digital-to-analog conversion, and transmitting the baseband signal to the transceiver module 110 or the transceiver module 120 supporting a specific frequency band according to a requirement.

In other embodiments, the radio frequency transceiver is suitable for more than three frequency bands, each frequency band is provided with a specific transceiver module, and each transceiver module is connected to a general signal processing module.

Because the transmission or reception of the radio frequency signals comprises the transmission process of the baseband signals, for signals of different frequency bands, the baseband signals in the receiving or transmitting stage can be set to be in the same or close frequency range, so that the same general signal processing module 130 can be adopted to transmit and process the baseband signals corresponding to each transceiver module, and a baseband signal processing module does not need to be designed for each frequency band signal independently, thereby reducing the number of elements in the radio frequency transceiver, further saving the chip area and saving the cost.

In addition, in the design process of the radio frequency transceiver, only the circuits of the transceiver module need to be designed respectively aiming at the radio frequency signals of different frequency bands and the parameter adjustment of the transceiver module needs to be carried out, and the element parameters in the general signal processing module are adjusted once aiming at the baseband signals, so that the design and debugging difficulty is reduced, the circuit parameter adjustment time can be shortened, and the design of the radio frequency transceiver can be completed more quickly.

Fig. 2 is a schematic structural diagram of a radio frequency transceiver according to another embodiment of the present invention.

In this embodiment, the transceiver module 110 of the radio frequency transceiver includes a receiving unit 111 and a transmitting unit 112 for the radio frequency signal of the frequency band 1; the transceiver module 120 includes a receiving unit 121 and a transmitting unit 122 for the radio frequency signal of the frequency band 2; the general signal processing module 130 includes a general reception processing unit 131 and a general transmission processing unit 132. In this embodiment, the frequency band1 may be a 2.4GHz ISM frequency band and a 5.8GHz ISM frequency band. In other embodiments, each frequency band may be other signal frequency bands, such as 915MHz, 869MHz, and the like.

The receiving unit 111 and the receiving unit 121 are both coupled to the general purpose receiving processing unit 131, and the transmitting unit 112 and the transmitting unit 122 are both coupled to the general purpose transmitting processing unit 132. In other embodiments, the rf transceiver has more than three transceiver modules, and the receiving unit of each transceiver module is coupled to the common receiving processing unit 131, and the transmitting unit of each transceiver module is coupled to the common transmitting processing unit 132.

The receiving unit 111 is configured to receive a radio frequency signal in a frequency band1, and down-convert the radio frequency signal in the frequency band1 to form an Intermediate Frequency (IF) signal; the receiving unit 121 is configured to receive a radio frequency signal in a frequency band2, and down-convert the radio frequency signal in the frequency band2 to form an Intermediate Frequency (IF) signal. In this embodiment, the Intermediate Frequency (IF) signal is a baseband signal. The general receiving and processing unit 131 is configured to receive one of the baseband signals, perform processing including analog-to-digital conversion and amplification on the baseband signal, form a digital signal containing information, and send the digital signal to the modem, where the modem demodulates the digital signal to obtain the information.

The radio frequency transceiver can be configured to be in a time domain multiplexing mode, only a receiving unit or a sending unit in the transceiving module corresponding to one frequency band works at the same time, and signal paths of the transceiving modules of other frequency bands are forbidden, so that power consumption is saved. Signals between each sending unit and each receiving unit in the transceiving module do not interfere with each other.

The general receiving processing unit 131 is configured to receive a baseband signal formed by down-converting a received radio frequency signal of a specific frequency band by a receiving unit in an active state. The general reception processing unit 131 connects to a signal path of a specific frequency Band by controlling the frequency Band selection signal Band _ sel, so as to receive a baseband signal.

The general transmitting and processing unit 132 is configured to transmit the baseband signal modulated by the modem to a transmitting unit in a specific frequency band, and convert the baseband signal into a radio frequency signal and transmit the radio frequency signal. In this embodiment, the general transmission processing unit 132 is controlled by a Band selection signal Band _ sel, and is connected to a signal path of a specific frequency Band to transmit a baseband signal.

The Band select signal Band _ sel may be generated by a modem.

The radio frequency transceiver respectively designs the transceiver module aiming at the radio frequency signals, designs the shared general signal processing module aiming at the baseband signals, reduces the number of devices and the area of a chip under the condition of meeting the requirements of working performance of different frequency bands, and can be multiplexed in various frequency bands to reduce the design period of products.

Fig. 3 is a schematic structural diagram of a radio frequency transceiver according to an embodiment of the present invention.

In this embodiment, a transceiver module 110 in a frequency band1 is taken as an example to explain. The structure of the transceiver module 120 in frequency band2 is the same as that of the transceiver module 110, and the difference is only in the parameter setting in each element.

The frequency band1 transceiver module 110 includes an rf antenna a1, and the rf antenna a1 is configured to have high performance for transceiving rf signals in frequency band 1. The transceiver module 110 includes a receiving unit 111 and a transmitting unit 112, the receiving unit 111 is connected to the rf antenna a1 through a switch K11, and the transmitting unit 112 is connected to the rf antenna a1 through a switch K12. By controlling the on/off of the switches K11 and K12, the transceiver module 110 can be controlled to receive or transmit signals through the rf antenna a 1. In other embodiments, the rf transceiver may be configured with only one antenna for receiving and transmitting signals in multiple frequency bands.

In this embodiment, each component in the transceiver module 110 performs parameter configuration on the radio frequency signal of the frequency band1, so that the transceiver module can have the best performance when operating in the frequency band 1. Specifically, the receiving unit 111 comprises a low noise amplifier LNA, a mixer MIX coupled to the low noise amplifier LNA, and a baseband amplifier BBA coupled to the mixer MIX, and an output of the baseband amplifier BBA is coupled to the general receiving processing unit 131 of the general signal processing module.

The sending unit 112 includes a phase-locked loop MPLL and a power amplifier PA, where the phase-locked loop is coupled to an input end of the power amplifier PA, and the power amplifier PA is coupled to the radio-frequency antenna a1 through a switch K12, and is configured to send a signal to the outside through the radio-frequency antenna a1 after performing power amplification. A voltage controlled oscillator circuit (VCO), a phase detector, a charge pump, a frequency divider, a sigma modulator, a low pass filter, a coarse frequency regulator, etc. may be integrated within the phase locked loop MPLL.

The general signal processing module is connected to the frequency band1 transceiver module 110 and the frequency band2 transceiver module 120. Specifically, the general receiving processing unit 131 of the general signal processing module includes an analog multiplexer a-MUX, an analog-to-digital amplifier ADA, and an analog-to-digital converter ADC. In other embodiments, the analog-to-digital amplifier ADA and the analog-to-digital converter ADC may also be replaced by a single analog-to-digital amplification converter integrated with the amplification and conversion functions. The analog multiplexer a-MUX is coupled to the output end of each receiving unit, and is configured to select a baseband signal output by the receiving unit 111 or the receiving unit 121 and output the baseband signal to the analog-to-digital amplifier ADA and the analog-to-digital converter ADC, and output a digital signal to the modem after sequentially performing amplification and analog-to-digital conversion.

In this embodiment, the analog multiplexer a-MUX is coupled to an output terminal of a baseband amplifier BBA in a receiving unit of the transceiver module, and is controlled by a Band select signal Band _ sel to gate one of the baseband signals for analog-to-digital conversion and amplification.

The general transmission processing unit 132 includes: and the digital multiplexer D-MUX is coupled to the input ends of the transmitting unit 112 and the transmitting unit 122, and is configured to transmit the modulation signal to be transmitted to the transmitting unit corresponding to one of the frequency bands. The digital multiplexer D-MUX is controlled by a frequency Band selection signal Band _ sel, one path of signal transmission channel is gated, and the baseband signal is transmitted to a transmitting unit in a transmitting and receiving module corresponding to the frequency Band1 or the frequency Band 2. Specifically, the digital multiplexer D-MUX is connected to the phase-locked loop MPLL, and performs phase locking, up-conversion, and other processing on the baseband signal through the phase-locked loop MPLL, so as to convert the baseband signal into a radio frequency signal, and the radio frequency signal is amplified by the power amplifier PA and then transmitted through the radio frequency antenna.

The general transmission processing unit 132 further includes a crystal oscillator XO and a frequency multiplier Doubler connected to the crystal oscillator XO, and the frequency multiplied by the frequency multiplier Doubler is provided to the phase-locked loop MPLL.

During the rf signal receiving process in the frequency band1, the receiving unit 111 and the general receiving processing unit 131 of the transceiver module 110 are activated, and other signal transmission paths may be disabled, so as to save circuit power consumption. The switch K11 is turned on, and a radio frequency signal of a frequency band1 is received by the radio frequency antenna a1, enters the receiving unit 111, is subjected to noise reduction and amplification by the low noise amplifier LNA, is mixed with the local oscillation signal LO, and is down-converted into an Intermediate Frequency (IF) signal. The frequency of the intermediate frequency signal can be 1MHz or 2MHz and the like. Specifically, the local oscillation signal LO is generated by the phase-locked loop MPLL, and the frequency of the local oscillation signal LO is equal to the frequency offset between the radio frequency signal and the intermediate frequency signal. The phase locked loop MPLL generates the local oscillator signal LO based on a very stable crystal oscillator reference (FREF). The frequency of the local oscillation signal LO is controlled by the crystal oscillator reference (FREF) and the control signals "MPLL _ n _ band1" and "MPLL _ f _ band1", and the frequency of the phase-locked loop MPLL locked to the new local oscillation signal LO can be controlled by changing the values of "MPLL _ n _ band1" and "MPLL _ f _ band1", so that the frequency adjustment of the local oscillation signal LO is realized, and the frequency change of the intermediate frequency signal after down-conversion is realized. Control signals "mpll _ n _ band1" and "mpll _ f _ band1" are generated by the modem. The intermediate frequency signals with the same frequency can be adopted for the radio frequency signals with different frequency bands, or the intermediate frequency signals with different frequencies can be respectively designed.

In this embodiment, the mixer MIX is an I/Q mixer, and outputs two signals with orthogonal phases, i.e., an in-phase signal (I) and a quadrature signal (Q).

In this embodiment, the frequency of the received radio frequency signal of frequency band1 may be divided into a plurality of smaller frequency bands, called channels, and the phase-locked loop MPLL may be configured to down-convert the radio frequency signal on a specific channel at a time, thereby down-converting the signals in the respective channels one by one.

When a radio frequency signal is down-converted from a radio frequency band to an intermediate frequency signal, it may be generally referred to as a baseband signal. The baseband signal output by the mixer MIX is amplified by a baseband signal amplifier BBA and then output to the general reception processing unit 131. The analog multiplexer a-MUX of the general receive processing unit 131 is controlled by a Band select signal "Band _ sel", and selects the signal output by the baseband amplifier BBA in the receive unit 111, which is coupled to the input of the analog-to-digital amplifier ADA for amplification, and after being digitized by the analog-to-digital converter ADC, the digital signal representing the I and Q baseband signals is transmitted to the digital modem. The coupling includes at least one of an alternating current coupling or a direct current coupling.

Similarly, the radio frequency antenna a2 in the frequency band2 receives the radio frequency signal in the frequency band2, after noise reduction and amplification by the low noise amplifier LNA, baseband signal amplification is performed by the MIX and the baseband signal amplifier BBA, then the analog multiplexer a-MUX in the general reception processing unit 131 selects the baseband signal output by the baseband amplifier BBA corresponding to the frequency band2, and transmits the baseband signal to the analog-to-digital amplifier ADA and the analog-to-digital converter ADC, thereby realizing reception of the radio frequency signal in the frequency band 2.

And in the signal transmission process, activating the transmitting unit in the transceiving module of the corresponding frequency band and the general transmitting and processing unit in the general signal processing module to transmit signals. Specifically, taking the frequency band1 as an example, the digital signals Tx _ data _ hp and Tx _ data _ lp to be transmitted are coded signals coded by the modem. In this embodiment, the message data to be transmitted is encoded in a frequency deviation from the center frequency of a Radio Frequency (RF) carrier using a modulation mode of GFSK (gaussian frequency shift keying). In other embodiments, other modulation schemes may be used to encode the message data.

The digital multiplexer D-MUX in the general transmit processing unit 132 selects a channel corresponding to the frequency Band1 according to the frequency Band selection signal Band _ sel, and transmits the modulation signal to the transmitting unit 112 in the transceiver module 110 corresponding to the frequency Band 1. Specifically, the digital multiplexer D-MUX sends the modulation signal to a phase-locked loop MPLL in the sending unit 112, performs up-conversion processing on the modulation signal through the phase-locked loop MPLL, converts the modulation signal into a radio frequency signal in a frequency band1, further performs power amplification through a power amplifier PA, and sends the radio frequency signal through a radio frequency antenna a 1. The frequency multiplier Doubler in the general transmission processing unit 132 multiplies the oscillation frequency of the crystal oscillator XO and provides the multiplied oscillation frequency to the phase-locked loop MPLL of the transmission unit 112, and provides the up-conversion frequency to the phase-locked loop MPLL.

When the radio frequency signal in the frequency band2 needs to be transmitted, the general transmission processing unit 132 and the transmission unit 122 in the transceiver module 120 are selected to be activated, and the signal is modulated into the radio frequency signal in the frequency band2 to be transmitted.

In the process of receiving and down-converting a radio frequency signal, it is necessary to minimize distortion problems such as defects and variations that may occur in the signal processing process. The amplitude of the received rf signal may vary, even by an order of magnitude, depending on the power of the transmitted signal and the distance between the transmitter and the receiver. In addition, the received radio frequency signal is a superposition of a desired signal and an undesired signal, which is usually generated intentionally or unintentionally by a nearby device, and which may have a larger amplitude than the desired signal, which as a noise signal may affect the signal-to-noise ratio of the signal. In order for the receiving path of the rf transceiver to work properly with the desired and undesired input signals with varying amplitudes, the receiving path needs to adjust the gains of the low noise amplifier LNA and the baseband signal amplifier BBA to maximize the signal power and the signal-to-noise ratio of the baseband signal received by the general-purpose reception processing unit 131. The transceiver module also needs to attenuate to some extent undesired signals around the desired frequency band of Intermediate Frequency (IF) signals. Finally, the unwanted signals are further filtered out by precision digital filters in the modem.

In order to implement the adjustment of the gain of the baseband signal to improve the signal-to-noise ratio of the baseband signal and attenuate the undesired signal, the receiving unit 111 and the receiving unit 121 are further configured to receive a gain control signal from the modem and adjust the gain multiple according to the gain control signal, thereby improving the signal-to-noise ratio of the signal output to the modem. In this embodiment, the general reception processing unit 131 further includes a gain detector AMP-D connected to an output terminal of the analog multiplexer a-MUX, for detecting an amplitude of an output signal of the analog multiplexer a-MUX, and comparing with a high threshold and a low threshold; when the high threshold value is exceeded, the amplitude is too large, and the gain detector AMP-D outputs a 'too-high' signal to a modem; when below the low threshold, the amplitude is too small, and the gain detector AMP-D outputs a "too-low" signal to the modem. The modem may feed back the Gain control signal Gain _ state to the LNA and the BBA on the corresponding receiving link according to the received signal, so as to perform Gain adjustment. Only one gain detector AMP-D needs to be designed for receiving signals in either band1 or band 2. The gain detector AMP-D, the digital logic control part of the modem and the low noise amplifier LNA and the baseband signal amplifier BBA may form an automatic gain control loop ensuring that the signal received at the input of the modem has a maximum signal-to-noise ratio (SNR).

The common components in the general signal processing module 130, such as the analog-to-digital amplifier ADA and the analog-to-digital converter ADC, and the components in the

transceiver modules

110 and 120 specific to each frequency band, such as the low noise amplifier LNA, the power amplifier PA and the phase-locked loop MPLL, have obvious differences. The devices in the transceiver module designed for a specific frequency band have high frequency selectivity, and the highest working efficiency can be achieved only when the transceiver module is configured in the current specific frequency band.

For example, the frequency of the voltage controlled oscillator circuit (VCO) within the phase locked loop MPLL is determined by the values of the capacitance (C) and the inductance (L):

if the oscillation frequency of the phase locked loop MPLL needs to be adjusted to accommodate signals in different frequency bands, for example, from 2.4GHz to 4.8GHz, the product of L and C must be 1/4. Since the inductance is generated by the change of current through a section of long conductive material on the chip, the inductance value is not easily changed. By subdividing the capacitance into smaller cells that are easily opened or closed, a change in capacitance can be achieved. Since the capacitance is determined by the overlapping area of the plates on both sides of the dielectric material, if a capacitor with an in-situ capacitance value capable of being changed by 4 times is required, it is necessary to have a unit capacitance area of 4 times to be able to change the capacitance area by 4 times. Since the capacitor and the inductor are devices occupying a large area in the integrated circuit, and other important performance indexes, such as power consumption, are affected by the increase of the chip cost with the increase of the area, the Voltage Controlled Oscillator (VCO) can be applied to multiple frequency bands by the design of internal components at a high cost in consideration of cost and performance trade-off. Similarly, the trade-off between power consumption and performance criteria (such as noise figure of LNA and efficiency of PA) makes it difficult to design LNAs and PAs that can be adapted to multiple frequency bands.

Based on the above analysis, in the embodiment of the present invention, devices with different frequency selectivity are designed in groups to form transceiver modules for different frequency bands and a general signal processing module insensitive to frequency.

Fig. 4 is a schematic structural diagram of a radio frequency transceiver according to another embodiment of the present invention.

In this embodiment, the baseband amplifier BBA is located in the general receiving and processing unit 4131, the receiving unit 4111 and the receiving unit 4121 include a low noise amplifier LNA and a mixer MIX, and a signal down-converted by the mixer MIX passes through the analog multiplexer a-MUX of the general receiving and processing unit 4131, is amplified by the baseband amplifier BBA, and is output to the analog-to-digital amplifier ADA and the analog-to-digital converter ADC.

Because the baseband amplifier BBA is used for amplifying baseband signals, and the baseband frequencies are consistent for the radio frequency signals of different frequency bands, the baseband amplifier BBA can be disposed in the general signal processing module 130, thereby further improving the multiplexing rate of devices, reducing the number of devices used by the radio frequency transceiver, and reducing the chip area and the design complexity.

In the radio frequency transceiver of the above embodiment, the specific transceiver module is designed according to a specific frequency band, the common general signal processing module is designed for a baseband signal, and the number of the relevant signal processing elements may be increased or decreased according to the requirement in the transceiver module and the general signal processing module of each frequency band. The performance of the device in the transceiver module for a specific frequency band mainly depends on the signal frequency, and the device cannot be shared by multiple frequency bands by comprehensively considering the area, power or other performance indexes. And the common signal processing module shared by the signals of all frequency bands operates under a common Intermediate Frequency (IF), namely a baseband signal, and because the frequencies of the intermediate frequency signals corresponding to all frequency bands are the same or have smaller difference, the components in the common signal processing module can be optimally designed, so that higher performance under the intermediate frequency signals is realized.

The specific structures of the transceiver module and the general signal processing module in the embodiments of the present invention are not limited to the specific functional devices, and those skilled in the art may add or reduce corresponding devices in the transceiver module and the general signal processing module of the radio frequency transceiver according to the requirements based on the above technical concepts.

The embodiment of the invention also provides a radio frequency transceiving system, which comprises the radio frequency signal transceiver and the modem in the embodiment; the radio frequency signal transceiver is connected to the modem through a single interface.

Fig. 5 is a schematic structural diagram of a radio frequency transceiving system according to an embodiment of the present invention.

The radio frequency transceiving system includes a radio frequency transceiver 100 and a modem 500.

For the specific structure of the radio frequency transceiver 100, please refer to the foregoing embodiments, which are not described herein again.

The modem 500 is a digital modem, and performs data signals with the general signal processing module 130 through a single interface (please refer to fig. 3 and 4), for example, receives signals Rxadc _ clk, Rxadc _ iout, Rxadc _ qout processed by the general reception processing unit 131, receives detection signals Too _ high and to _ low output by the Gain detector AMP-D, sends data signals Tx _ data _ hp and Tx _ data _ lp to the radio frequency signal transceiver, a Gain control signal Gain _ state, and control signals MPLL _ n _ Band1, MPLL _ f _ Band1, and MPLL _ n _ Band2, MPLL _ f _ Band2 for controlling the frequency of the local oscillation signal LO of the phase-locked loop MPLL, and a Band selection signal Band _ sel for controlling the analog multiplexer a-MUX and the digital multiplexer D-MUX.

The whole structure of the radio frequency transceiving system only provides one digital modem interface, and is not related to the supported frequency bands. The architecture can minimize the design workload and simultaneously maximize the performance of the radio frequency transceiver in the aspects of power, noise coefficient, efficiency and linearity, thereby realizing the rapid marketing of the complex multi-band radio frequency transceiver and the radio frequency transceiving system.

The above-mentioned embodiments are only examples of the present application, and not intended to limit the scope of the present application, and all equivalent structures or equivalent flow transformations made by the contents of the specification and the drawings, such as the combination of technical features between the embodiments and the direct or indirect application to other related technical fields, are also included in the scope of the present application.

Claims

1. A radio frequency transceiver, comprising:

at least two transceiver modules working in different frequency bands, which are respectively used for transceiving radio frequency signals in different frequency bands and performing frequency conversion between the radio frequency signals and baseband signals;

and the general signal processing module is connected with each transceiver module and is used for realizing the transmission and processing of baseband signals between each transceiver module and the modem.

2. The radio frequency transceiver of claim 1,

the transceiver module includes: a receiving unit and a transmitting unit;

the general signal processing module comprises: a general receiving processing unit connected with the output end of each receiving unit and a general transmitting processing unit connected with the receiving end of each transmitting unit.

3. The rf transceiver of claim 2, wherein the general purpose receive processing unit comprises: an analog multiplexer and an analog-to-digital amplification converter; the analog multiplexer is coupled to the output end of each receiving unit and is used for selecting and outputting the signal output by one receiving unit; the output end of the analog multiplexer is coupled to the input end of the analog-to-digital amplification converter, and the analog-to-digital amplification converter is used for performing analog-to-digital amplification conversion processing on the signal output by the analog multiplexer and outputting the signal to the modem.

4. The RF transceiver of claim 3, wherein the receiving unit comprises: a low noise amplifier, a mixer coupled to the low noise amplifier, and a baseband amplifier coupled to the mixer, an output of the baseband amplifier being coupled to the analog multiplexer.

5. The RF transceiver of claim 3, wherein the general purpose receive processing unit further comprises: a baseband amplifier coupled between the output of the analog multiplexer and the input of the analog-to-digital amplification converter, the output of the baseband amplifier being coupled to the analog-to-digital amplification converter.

6. The RF transceiver of claim 5, wherein the receiving unit comprises: a low noise amplifier, a mixer coupled to the low noise amplifier, an output of the mixer coupled to the analog multiplexer.

7. The radio frequency transceiver of claim 3, further comprising: and the gain detector is used for detecting the amplitude of the signal input to the analog-to-digital amplification converter, comparing the amplitude with an amplitude threshold value and outputting a corresponding detection signal to the modem according to the comparison result.

8. The RF transceiver of claim 7, further configured to receive a gain control signal fed back by a modem according to the detection signal, and adjust the amplitude of the signal input to the ADC according to the gain control signal.

9. The rf transceiver of claim 2, wherein the transmit unit includes a phase-locked loop, and a power amplifier coupled to an output of the phase-locked loop.

10. The RF transceiver of claim 3, wherein the general purpose transmit processing unit comprises: and the digital multiplexer is coupled to the input end of each transmitting unit and is used for transmitting the modulation signal to be transmitted to the transmitting unit corresponding to one of the frequency bands.

11. The rf transceiver of claim 10, wherein the digital multiplexer and the analog multiplexer are configured to receive a frequency band selection signal transmitted by a modem to select a corresponding frequency band.

12. The RF transceiver of claim 4, wherein the phase-locked loop is configured to provide a local oscillation signal to a mixer in the receiving unit, and wherein the phase-locked loop is configured to lock a frequency of the local oscillation signal according to a frequency-locked signal transmitted by a modem.

13. A radio frequency transceiver system, comprising:

the radio frequency transceiver of any one of claims 1 to 12;

the radio frequency transceiver is connected to the modem through a single interface.