WO2021115453A1 - 无线接收机及无线设备 - Google Patents

无线接收机及无线设备 Download PDF

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Publication number
WO2021115453A1
WO2021115453A1 PCT/CN2020/135917 CN2020135917W WO2021115453A1 WO 2021115453 A1 WO2021115453 A1 WO 2021115453A1 CN 2020135917 W CN2020135917 W CN 2020135917W WO 2021115453 A1 WO2021115453 A1 WO 2021115453A1
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Prior art keywords
radio frequency
gain
noise amplifier
circuit
frequency signal
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PCT/CN2020/135917
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English (en)
French (fr)
Inventor
李伟
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上海摩软通讯技术有限公司
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Publication of WO2021115453A1 publication Critical patent/WO2021115453A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers

Definitions

  • This application relates to wireless communication technology, and in particular to a wireless receiver and wireless equipment.
  • Wireless receivers are widely used in radio frequency communication circuits.
  • the radio frequency processing solutions of wireless receivers have been very mature, but with the increase of application scenarios, the requirements for signal quality in different scenarios are getting higher and higher. In this way, wireless receivers need to receive and process radio frequency signals of various intensities in different scenarios.
  • a wireless receiver usually includes a radio frequency pre-stage circuit and a radio frequency post-stage circuit.
  • a low-noise amplifier is usually added to the radio frequency pre-stage circuit, and the radio frequency signal is subjected to gain amplification processing through the low-noise amplifier.
  • the radio frequency signal strength range that can be received and processed by the wireless receiver is still limited, so that the wireless receiver cannot be used in various scenarios.
  • the embodiments of the present application provide a wireless receiver and a wireless device to solve the limitation of the intensity range of the radio frequency signal that can be received and processed by the wireless receiver in some situations, making the wireless receiver unable to be applied to various different scenarios. In the problem.
  • An embodiment of the present application provides a wireless receiver including: a radio frequency pre-stage circuit and a radio frequency post-stage circuit.
  • the radio frequency post-stage circuit includes a gain processing circuit, and the gain processing circuit includes a plurality of gain channels, and the gains corresponding to each of the gain channels are different.
  • the radio frequency pre-stage circuit is used to receive a first radio frequency signal from a radio frequency antenna, and process the first radio frequency signal to obtain a second radio frequency signal; the radio frequency post-stage circuit is used to pass through the gain processing circuit
  • One or more of the gain channels process the second radio frequency signal to obtain a third radio frequency signal, so that the intensity of the digital signal obtained according to the third radio frequency signal meets a preset condition.
  • each of the gain channels includes a plurality of first low-noise amplifiers arranged in cascade, and each of the first low-noise amplifiers includes three working states: a through state, an amplified state, and an attenuated state.
  • the radio frequency pre-stage circuit includes a second low-noise amplifier, and the second low-noise amplifier includes three working states: a through state, an amplification state, and an attenuation state.
  • the radio frequency post-circuit further includes: a gain control circuit and a serial bus interface SSBI controller, the SSBI controller is respectively connected to the gain control circuit, the gain processing circuit, and the second Low noise amplifier connection;
  • the gain control circuit is used to determine the target operating state of the second low noise amplifier according to the intensity of the digital signal corresponding to the third radio frequency signal output by the gain processing circuit, and control the second low noise amplifier through the SSBI controller The second low-noise amplifier is working in the target working state.
  • the gain control circuit is further configured to determine the target gain channel of the gain processing circuit according to the strength of the digital signal, and according to the system gain of the target gain channel and the second low noise amplifier The gain corresponding to the target operating state is determined, the target operating state corresponding to each of the first low noise amplifiers in the target gain channel is determined, and each of the first low noise amplifiers is controlled to work in the corresponding target operating state.
  • the radio frequency post circuit further includes: an analog-to-digital converter A/D and a digital variable gain amplifier DVGA, the gain processing circuit, the A/D, the DVGA, and the gain control The circuits are connected in sequence;
  • the A/D is used to perform analog-to-digital conversion on the third radio frequency signal output by the gain processing circuit to obtain a digital signal corresponding to the third radio frequency signal;
  • the DVGA is used to output the intensity of the digital signal to the gain control circuit
  • the DVGA is also used to perform gain amplification on the digital signal, so that the strength of the digital signal after the gain amplification meets the preset condition.
  • a mixer is further provided between the gain processing circuit and the A/D, and the mixer is used to change the frequency of the third radio frequency signal output by the gain processing circuit.
  • the radio frequency pre-stage circuit further includes: a first filter, and the first filter is arranged at the input end of the second low noise amplifier;
  • the first filter is used for filtering the first radio frequency signal received from the radio frequency antenna.
  • the radio frequency pre-stage circuit further includes: a second filter, and the second filter is arranged at the output end of the second low noise amplifier;
  • the second filter is used for filtering the second radio frequency signal output by the second low noise amplifier.
  • An embodiment of the present application provides a wireless device, including a radio frequency antenna and the above-mentioned radio receiver; wherein the radio frequency pre-stage circuit is connected to the radio frequency antenna.
  • An embodiment of the present application provides a wireless receiver including: a radio frequency pre-stage circuit and a radio-frequency post-stage circuit; the radio-frequency post-stage circuit includes a gain processing circuit, and the gain processing circuit includes a plurality of gain channels, and each of the gain channels corresponds to
  • the gain of the radio frequency front stage circuit is used to receive the first radio frequency signal from the radio frequency antenna, and the first radio frequency signal is processed to obtain the second radio frequency signal;
  • the radio frequency rear stage circuit is used to pass the gain
  • One or more of the gain channels in the processing circuit process the second radio frequency signal to obtain a third radio frequency signal, so that the intensity of the digital signal obtained according to the third radio frequency signal meets a preset condition.
  • each gain channel corresponds to a different gain, so that when the wireless receiver receives signals with different signal strengths, different gain channels can be selected to make the The strength of the digital signal corresponding to the third signal satisfies the preset condition, so that the wireless receiver can receive signals with different signal strengths, which increases the strength range of the radio frequency signal that can be received and processed by the wireless receiver, so that the wireless receiver can be applied to In a variety of different scenarios.
  • FIG. 1 is a schematic structural diagram of a wireless receiver provided by an embodiment of the application
  • 2A is a schematic structural diagram of a low noise amplifier provided by an embodiment of the application.
  • 2B is a schematic structural diagram of another low-noise amplifier provided by an embodiment of the application.
  • FIG. 2C is a schematic structural diagram of yet another low noise amplifier provided by an embodiment of the application.
  • FIG. 3 is a schematic structural diagram of another wireless receiver provided by an embodiment of this application.
  • FIG. 4 is a schematic structural diagram of another wireless receiver provided by an embodiment of this application.
  • FIG. 5 is a schematic structural diagram of still another wireless receiver provided by an embodiment of this application.
  • FIG. 6 is a schematic structural diagram of another wireless receiver provided by an embodiment of the application.
  • FIG. 7 is a schematic diagram of gain switching of a four-stage low-noise amplifier provided by an embodiment of the application.
  • FIG. 8A is a schematic diagram of a gain matching logic provided by an embodiment of the application.
  • FIG. 8B is a schematic diagram of another gain matching logic provided by an embodiment of the application.
  • FIG. 8C is a schematic diagram of yet another gain matching logic provided by an embodiment of the application.
  • 9A is a state control switching diagram of a finite state machine provided by an embodiment of the application.
  • FIG. 9B is another finite state machine state control switching diagram provided by an embodiment of this application.
  • FIG. 10 is a schematic structural diagram of a wireless device provided by an embodiment of this application.
  • FIG. 11 is a schematic structural diagram of another wireless device provided by an embodiment of this application.
  • FIG. 1 is a schematic structural diagram of a wireless receiver provided by an embodiment of the application. As shown in FIG. 1, the wireless receiver of this embodiment includes: a radio frequency pre-stage circuit and a radio frequency post-stage circuit.
  • the radio frequency post-stage circuit includes a gain processing circuit, and the gain processing circuit includes a plurality of gain channels, and each gain channel corresponds to a different gain.
  • the radio frequency pre-stage circuit is used to receive the first radio frequency signal from the radio frequency antenna and process the first radio frequency signal to obtain the second radio frequency signal; the radio frequency post-stage circuit is used to calculate the second radio frequency signal through one or more gain channels in the gain processing circuit 2.
  • the radio frequency signal is processed to obtain the third radio frequency signal, so that the intensity of the digital signal obtained according to the third radio frequency signal meets the preset condition.
  • the radio frequency pre-stage circuit refers to the circuit between the radio frequency transceiver (also referred to as the radio frequency post circuit in this embodiment) and the radio frequency antenna.
  • the radio frequency front-end circuit is used to process the first radio frequency signal received from the radio frequency antenna, and transmit the obtained second radio frequency signal to the radio frequency transceiver, so that the radio frequency transceiver performs subsequent processing on the second radio frequency signal .
  • the radio frequency pre-stage circuit may include a filter, a low noise amplifier (Low Noise Amplifier, LNA), and so on.
  • the filter is used to filter out-of-band noise or system noise.
  • a low noise amplifier can also be called a low noise amplifier. It is a radio frequency device that linearly amplifies the received signal. Its core indicators are the operating frequency band, noise figure (NF), gain, and maximum input power (this is In order to prevent the low-noise amplifier from saturating the large signal, resulting in distortion of the received signal).
  • the low noise amplifier is used to perform gain processing on the first radio frequency signal received from the radio frequency antenna.
  • Figures 2A and 2B are schematic diagrams of two possible low-noise amplifiers.
  • FIGS. 2A and 2B are only schematic diagrams of two possible low-noise amplifier structures, and other structures may also be used in practical applications, as shown in FIG. 2C, which is not limited in this embodiment.
  • the RF post-circuit refers to the circuit between the RF pre-circuit and the baseband system.
  • the radio frequency post-stage circuit may be a circuit corresponding to the radio frequency transceiver.
  • the radio frequency post-circuit is used to process the second radio frequency signal received from the radio frequency pre-circuit to obtain the third radio frequency signal.
  • the foregoing processing process may include gain amplification processing, frequency mixing processing, etc., so that the intensity of the digital signal corresponding to the obtained third radio frequency signal meets a preset condition.
  • the preset condition may mean that the strength of the digital signal reaches the strength range of the intermediate frequency signal of the receiver, that is, the signal strength floats between a certain range to avoid signal disorder.
  • the RF post-circuit includes multiple gain channels, and each gain channel corresponds to a different gain.
  • the two gain channels may be respectively a high-gain channel and a low-gain channel, and the gain corresponding to the high-gain channel is greater than the gain corresponding to the low-gain channel.
  • the three gain channels can be high-gain channel, medium-gain channel, and low-gain channel respectively.
  • the corresponding gain of the high-gain channel is greater than that of the medium-gain channel, and the gain of the medium-gain channel is greater than that of the low-gain channel.
  • the gain corresponding to the channel may also be included, and this embodiment does not limit the number of gain channels.
  • the radio frequency front-end circuit after the radio frequency front-end circuit receives the first radio frequency signal from the radio frequency antenna, the radio frequency front-end circuit first processes the first radio frequency signal to obtain the second radio frequency signal. Then, the radio frequency post-circuit may select different gain channels in the gain processing circuit to process the second radio frequency signal according to the second radio frequency signal. For example, when the intensity of the second radio frequency signal is low, a high gain channel can be used to process the second radio frequency signal, and when the intensity of the second radio frequency signal is high, a low gain channel can be employed to process the second radio frequency signal.
  • one of the gain channels can be selected, or multiple gain channels can be selected, which is not limited in this embodiment.
  • the wireless receiver includes: a radio frequency pre-stage circuit and a radio-frequency post-stage circuit; the radio-frequency post-stage circuit includes a gain processing circuit, and the gain processing circuit includes a plurality of gain channels, and each gain channel corresponds to a different gain; the radio frequency pre-stage circuit Used to receive the first radio frequency signal from the radio frequency antenna, and process the first radio frequency signal to obtain the second radio frequency signal; the radio frequency post-stage circuit is used to perform the second radio frequency signal through one or more gain channels in the gain processing circuit Processing to obtain the third radio frequency signal, so that the intensity of the digital signal obtained according to the third radio frequency signal meets the preset condition.
  • the RF post-circuit can choose to use different gain channels in the gain processing circuit according to the strength of the second radio frequency signal.
  • the radio frequency signal is processed to ensure that the strength of the third radio frequency signal obtained is within a certain range, so that the strength of the digital signal corresponding to the third radio frequency signal meets the preset condition, so that the wireless receiver can receive and process signals of different signal strengths. Radio frequency signals, so that wireless receivers can be used in a variety of different scenarios.
  • FIG. 3 is a schematic structural diagram of another wireless receiver provided by an embodiment of the application. On the basis of the embodiment shown in FIG. 1, this embodiment describes in detail possible structures of the gain channel and the radio frequency pre-stage circuit.
  • the wireless receiver includes: RF pre-stage circuit and RF post-stage circuit.
  • the RF post-stage circuit includes a gain processing circuit, the gain processing circuit includes multiple gain channels, and each gain channel corresponds to a different gain; as shown in Figure 3, each gain channel includes multiple first low-noise amplifiers arranged in cascade. , Each first low-noise amplifier includes three working states: through state, amplifying state, and attenuating state.
  • each gain channel includes four first low-noise amplifiers arranged in cascade, and each first low-noise amplifier includes three working states: through state, amplification state, and attenuation state.
  • each gain channel may be composed of four first low noise amplifiers cascaded.
  • each gain channel can also be cascaded with eight first low-noise amplifiers. It can be understood that the signal strength range processed by the gain channel composed of four low-noise amplifier cascades is smaller than that of the gain channel composed of eight low-noise amplifier cascades.
  • the gain channel includes the first low noise
  • a larger number of first low-noise amplifiers may also be included, and this embodiment does not limit the number of cascaded first low-noise amplifiers.
  • the strength of the first radio frequency signal received by the radio frequency antenna of the wireless receiver at different times is different.
  • the radio frequency pre-stage circuit receives the first radio frequency signal from the radio frequency antenna
  • the second low noise amplifier in the radio frequency pre-stage circuit first processes the first radio frequency signal to obtain the second radio frequency signal. Then, the radio frequency post-circuit can select different gain channels according to the second radio frequency signal, and at the same time make the first low noise amplifier in different working states.
  • a high gain channel can be used to make one or more of the first low noise amplifiers cascaded in the high gain channel in an amplified state to process the second radio frequency signal.
  • a low gain channel can be used to make one or more of the first low noise amplifiers cascaded in the low gain channel in an attenuated state to process the second radio frequency signal.
  • one of the gain channels can be selected, or multiple gain channels can be selected, which is not limited in this embodiment.
  • each gain channel includes multiple first low-noise amplifiers arranged in cascade
  • each first low-noise amplifier includes three working states: through state, amplifying state, and attenuating state.
  • the strength of the second radio frequency signal is processed by using different gain channels and the first low-noise amplifiers in different working states to ensure that the strength of the third radio frequency signal obtained is within a certain range, so that the digital signal corresponding to the third radio frequency signal is The intensity meets the preset conditions, even if the RF post-circuit can handle both weak signals and strong signals, it increases the intensity range that the RF post-circuit can receive and process RF signals, thereby increasing the wireless receiver's ability to receive and process The strength range of the radio frequency signal enables the wireless receiver to be used in a variety of different scenarios.
  • the radio frequency pre-stage circuit includes a second low-noise amplifier, and the second low-noise amplifier includes three working states: a through state, an amplification state, and an attenuation state.
  • the radio frequency pre-stage circuit includes a second low noise amplifier.
  • the radio frequency pre-stage circuit After receiving the first radio frequency signal from the radio frequency antenna, the radio frequency pre-stage circuit processes the first radio frequency signal through the second low-noise amplifier to obtain the second radio frequency signal.
  • the second low-noise amplifier processes the first radio frequency signal, it may perform signal pass-through processing, signal amplification processing or signal attenuation processing.
  • the control module can be used to control whether the second low noise amplifier works in a through state, an amplified state or an attenuated state.
  • the working state of the second low noise amplifier can be selected according to the strength of the first radio frequency signal. For example, when the strength of the first radio frequency signal is weak, the working state of the second low-noise amplifier can be set in the amplified state to obtain the second radio frequency signal. When the strength of the first radio frequency signal is strong, the second low noise amplifier can be made The working state of the amplifier is in the attenuation state to obtain the second radio frequency signal.
  • the working state of the second low noise amplifier can be in the through state to obtain the second radio frequency signal.
  • the second low-noise amplifier in different working states for processing according to the intensity of the first radio frequency signal, it can be ensured that the intensity range of the third radio frequency signal obtained after the second radio frequency signal is within a certain range, so that the third radio frequency signal The intensity of the corresponding digital signal meets the preset condition.
  • the radio frequency pre-stage circuit also includes a second low noise amplifier
  • the second low noise amplifier includes three working states: through state, amplification state, and attenuation state, so the second low noise amplifier can be made according to the first radio frequency signal.
  • the noise amplifier is in different working states for processing to obtain the second radio frequency signal, which enhances the relatively good reception performance of the radio frequency front-end circuit.
  • the radio frequency front-end circuit can handle both weak signals and strong signals, which increases the RF front-end
  • the level circuit can receive and process the intensity range of the radio frequency signal, thereby increasing the intensity range of the radio frequency signal that can be received and processed by the wireless receiver, so that the wireless receiver can be applied in various different scenarios.
  • FIG. 4 is a schematic structural diagram of another wireless receiver provided by an embodiment of the application. Based on the embodiment shown in FIG. 3, this embodiment describes in detail possible structures of a radio frequency back-end circuit and a radio frequency front-end circuit .
  • the wireless receiver includes a radio frequency pre-stage circuit and a radio frequency post-stage circuit.
  • the RF back-stage circuit also includes an analog-to-digital converter (A/D converter) and a digital variable gain amplifier (Digital Variable Gain Amplifier, DVGA), gain processing circuit, A/D converter /D converter, DVGA and gain control circuit are connected in sequence.
  • A/D converter analog-to-digital converter
  • DVGA digital variable gain amplifier
  • the A/D converter is used to perform analog-to-digital conversion on the third radio frequency signal output by the gain processing circuit to obtain the digital signal corresponding to the third radio frequency signal;
  • DVGA is used to output the intensity of the digital signal to the gain control circuit;
  • DVGA is also used to The digital signal is gain-amplified, so that the strength of the gain-amplified digital signal meets the preset condition.
  • the gain processing circuit, the A/D converter, the DVGA, and the gain control circuit in the RF post-circuit are connected in sequence.
  • the A/D converter in the RF post-circuit receives the third RF signal processed by the gain processing circuit and converts the analog signal into a digital signal to obtain a digital signal corresponding to the third RF signal.
  • the DVGA receives the digital signal for processing. Further gain amplification processing is performed so that the intensity of the digital signal after gain amplification meets the preset condition, and the intensity of the digital signal is output to the gain control circuit.
  • a mixer is further provided between the above-mentioned gain processing circuit and the A/D converter.
  • the mixer is used to change the frequency of the third radio frequency signal output by the gain processing circuit.
  • the gain processing circuit, the mixer, the A/D converter, the DVGA, and the gain control circuit in the RF post-circuit are connected in sequence.
  • the A/D converter in the radio frequency post-circuit receives the third radio frequency signal processed by the gain processing circuit and performs processing of converting an analog signal into a digital signal to obtain a digital signal corresponding to the third radio frequency signal.
  • the signal undergoes frequency conversion processing to obtain an intermediate frequency digital signal
  • the DVGA receives the intermediate frequency digital signal for further gain amplification processing, so that the strength of the gain-amplified digital signal meets a preset condition, and outputs the strength of the digital signal to the gain control circuit.
  • the radio frequency pre-stage circuit further includes: a first filter, and the first filter is arranged at the input end of the second low noise amplifier.
  • the first filter is used for filtering the first radio frequency signal received from the radio frequency antenna.
  • the first filter and the second low noise amplifier in the radio frequency pre-stage circuit are connected in sequence.
  • the first filter of the radio frequency front-end circuit performs processing of filtering out-of-band noise on the first radio frequency signal received from the radio frequency antenna, and the first radio frequency signal from which out-of-band noise is filtered out is processed by the gain processing of the second low noise amplifier.
  • the second low-noise amplifier processes the first radio frequency signal, it may perform signal pass-through processing, signal amplification processing or signal attenuation processing.
  • the radio frequency pre-stage circuit further includes: a second filter, and the second filter is arranged at the output end of the second low noise amplifier.
  • the second filter is used for filtering the second radio frequency signal output by the second low noise amplifier.
  • the first filter, the second low noise amplifier, and the second filter in the radio frequency pre-stage circuit are connected in sequence.
  • the first filter of the radio frequency front-end circuit performs processing of filtering out-of-band noise on the first radio frequency signal received from the radio frequency antenna, and the first radio frequency signal from which out-of-band noise is filtered out is processed by the gain processing of the second low noise amplifier.
  • the second radio frequency signal is obtained, and the second radio frequency signal is processed by the second filter to filter system noise and then input to the radio frequency post-circuit.
  • the radio frequency front-end circuit includes a first filter, a second low noise amplifier, and a second low noise amplifier.
  • the first filter, the second low noise amplifier, and the second low noise amplifier are connected in sequence;
  • the stage circuit includes gain processing circuit, mixer, A/D converter, DVGA and gain control circuit. Among them, the gain processing circuit, mixer, A/D converter, DVGA and gain control circuit are connected in sequence.
  • the first filter of the circuit is used to filter out the out-of-band noise of the first radio frequency signal received from the radio frequency antenna, and the first radio frequency signal that filters out the out-of-band noise is processed by the second low noise amplifier to obtain the second radio frequency signal.
  • the second radio frequency signal is processed by the second filter to filter the system noise and then input to the gain processing circuit of the radio frequency post-circuit.
  • the gain processing circuit of the radio frequency post-circuit is used to process the second radio frequency signal to obtain the third radio frequency.
  • the obtained third radio frequency signal is converted into a digital signal by the frequency conversion of the mixer and the analog signal of the A/D converter to obtain the digital signal corresponding to the third radio frequency signal, and then the digital signal corresponding to the third radio frequency signal is obtained through the DVGA for gain amplification processing and then gain control
  • the circuit outputs a digital signal so that the strength of the gain-amplified digital signal meets a preset condition, and sends the digital signal that meets the preset condition to the gain control circuit to obtain the strength of the digital signal. In this way, the intensity of the digital signal after the above-mentioned processing is constant (maintained within a certain range), and excellent processing of receiving radio frequency signals is realized.
  • FIG. 5 is a schematic structural diagram of another wireless receiver provided by an embodiment of the application. Based on the embodiment shown in FIG. 4, this embodiment describes in detail possible structures of the radio frequency post-circuit.
  • the radio frequency back-stage circuit also includes: a gain control circuit and a serial bus interface (Single-Wire Serial Bus Interface, referred to as SSBI) controller.
  • SSBI Serial Bus Interface
  • the SSBI controller is respectively connected with the gain control circuit and the second low noise amplifier.
  • the gain control circuit is used for determining the target working state of the second low noise amplifier according to the intensity of the digital signal corresponding to the third radio frequency signal output by the gain processing circuit, and controlling the second low noise amplifier to work in the target working state through the SSBI controller.
  • the gain control circuit includes: a received signal estimation module, a gain finite state machine, a radio frequency NV parameter, and an automatic control compensation control module.
  • the received signal estimation module determines the corresponding RSSI value according to the intensity of the digital signal corresponding to the third radio frequency signal output by the gain processing circuit
  • the gain finite state machine determines the corresponding RSSI value according to the intensity of the digital signal corresponding to the third radio frequency signal output by the gain processing circuit.
  • the corresponding RSSI value determines the target working state of the second low noise amplifier, and controls the SSBI controller through the status word so that the SSBI controller controls the second low noise amplifier to work in the working state corresponding to the current RSSI value according to the control word, that is, the target Working state (through state or amplification state or attenuation state).
  • the target Working state through state or amplification state or attenuation state.
  • RSSI ⁇ -100dBm then the second low noise amplifier is in the amplification state.
  • the radio frequency NV parameters are used to control radio frequency power or radio frequency received signal strength and other related radio frequency non-loss parameters, namely non-volatile memory, including the current system gain of the target gain channel and the target working state of the second low noise amplifier.
  • the system gain of the target gain channel corresponding to the current RSSI is obtained by adding the current gain of.
  • the gain control circuit is further configured to determine the target gain channel of the gain processing circuit according to the strength of the digital signal, and determine the target gain channel according to the system gain of the target gain channel and the gain corresponding to the target working state of the second low noise amplifier
  • Each of the first low-noise amplifiers corresponds to a target operating state, and each first low-noise amplifier is controlled to work in its corresponding target operating state.
  • the received signal estimation module in the gain control circuit determines the corresponding RSSI value according to the intensity of the digital signal corresponding to the third radio frequency signal output by the gain processing circuit, and the gain finite state machine also determines the corresponding RSSI value according to the intensity of the digital signal.
  • the corresponding RSSI value determines the target gain channel of the gain processing circuit.
  • the gain finite state machine determines the target gain channel of the gain processing circuit according to the corresponding relationship between the RSSI value in Table 1 or Table 2 and the target gain channel.
  • the target gain channel After determining the target gain channel, determine the target operating state of each first low noise amplifier in the target gain channel according to the four-stage low-noise amplifier gain switching diagram shown in Figure 7, and control to call the RF NV parameters to make each first low-noise amplifier in the target gain channel.
  • a low-noise amplifier works in each corresponding working state.
  • the compensation control module controls the DVGA to perform gain compensation on the digital signal, thereby completing the automatic control of the system gain.
  • Table 1 shows the mapping relationship between the target gain channel and the second low noise amplifier corresponding to different signal scenarios.
  • the system can perform adaptive gain adjustment, that is, according to the real-time monitored signal strength status, real-time control and switching of the first low-noise amplifier and the second low-noise amplifier.
  • the specific value of RSSI of the signal scene in the table can be adjusted according to the actual system working status. For example: RSSI ⁇ -100dBm, according to Table 1, it can be known that the working state of the second low noise amplifier is the gain state, and the target gain channel is the high gain channel.
  • the target working state of each first low-noise amplifier in the target gain channel is determined, and the radio frequency NV parameters are controlled and called to make each first low-noise amplifier work in Under their respective working conditions, the automatic control of the system gain is completed.
  • the RSSI gradually increases from less than -100dBm to -75dBm, and the working state of each first low-noise amplifier of the target gain channel is switched from the four-stage amplification state to the three-stage amplification state.
  • Table 2 shows the mapping relationship between the target gain channel and the second low noise amplifier corresponding to another different signal scenario.
  • the system can adjust the gain adaptively.
  • the specific value of RSSI of the signal scene in the table can be adjusted according to the actual working status of the system. For example: RSSI ⁇ -85dBm, according to Table 2, it can be known that the working state of the second low noise amplifier is the gain state, and the target gain channel can be any one of the high gain channel or the low gain channel.
  • the target working state of each first low-noise amplifier in the target gain channel is determined, and the radio frequency NV parameters are controlled and called to make each first low-noise amplifier work in Under their respective working conditions, the automatic control of the system gain is completed.
  • the RSSI gradually increases from less than -85dBm to -75dBm, and the working state of each first low-noise amplifier of the target gain channel is switched from a four-stage gain state to a three-stage gain state.
  • an effective method is to adjust the gain of the second low noise amplifier and the target gain channel to ensure that the total gain of the system matches the gain of the target gain channel.
  • Add the gains corresponding to the target working state of the current RSSI to calculate the system gain of the target gain channel corresponding to the current RSSI, and store the calculated system gain of the target gain channel corresponding to the current RSSI into the RF NV parameters for adaptive gain adjustment When calling directly.
  • FIG. 8A is a schematic diagram of a gain matching logic provided by an embodiment of the application
  • FIG. 8B is a schematic diagram of another gain matching logic provided by an embodiment of the application
  • FIG. 8C is a schematic diagram of another gain matching logic provided by an embodiment of the application
  • 9A is a state control switching diagram of a finite state machine provided by an embodiment of this application
  • FIG. 9B is another state control switching diagram of a finite state machine provided by an embodiment of this application.
  • the target gain channel is a low gain channel, as shown in Fig. 8A, or the target gain channel is a high gain channel, as shown in Fig. 8B.
  • the total gain formula of the system is as follows: formula 1 or formula 2.
  • i represents the first low-noise amplifier of the i-th stage, and the value can be 1, 2, 3, or 4.
  • ai, bi, ci indicate the state of the i-th stage, and the value can be 0, 1, 0 indicates that the working state of the first low noise amplifier is in the through state, and 1 indicates that the working state of the first low noise amplifier is in the amplified state or Decay state.
  • ALi represents the gain value of the i-th stage first low noise amplifier in the low gain channel when it is in the attenuation state
  • KLi represents the gain value of the i-th stage first low noise amplifier in the low gain channel when it is in the through state
  • GLi represents the low gain channel
  • g is the gain error of the system by default 5.
  • i represents the first low-noise amplifier of the i-th stage, and the value can be 1, 2, 3, or 4.
  • a i ,b i ,c i represent the state of the i-th stage, and the value can be 0,1, 0 indicates that the working state of the first low noise amplifier is in the through state, and 1 indicates that the working state of the first low noise amplifier is in Amplified state or attenuated state.
  • AH i represents the gain value of the i-th stage first low noise amplifier in the high gain channel in the attenuation state
  • KH i represents the gain value of the i-th stage first low noise amplifier in the high gain channel in the through state
  • GH i represents the high The gain value when the first low noise amplifier of the i-th stage is in the amplified state in the gain channel.
  • g is the gain error of the system by default 5.
  • Table 3 is a mapping table for eight-level gain level switching provided in an embodiment of the application. It can be seen from Table 3 that the target gain channel is a high gain channel, that is, the target gain channel is switched to a high gain channel through adaptive gain adjustment, and the gain level of each first low noise amplifier is: GH1, GH2, GH4 , GH5, GH6, GH7, GH6, GH6. At the same time, it can be seen from Table 3 that the gain levels of the second low noise amplifier are: G2, G2, G2, G2, G2, G2, G1, G0.
  • the working state of each second low noise amplifier is state0: attenuation state, attenuation -4dB; state1: through state, attenuation 0dB; state2: gain state, gain 13dB.
  • the second low-noise amplifier is in the amplification mode for the first six stages, the seventh stage is in the pass-through mode, and the eighth stage is in the attenuation mode. In this way, the second low noise amplifier is always in amplifying state in the scene of weak signal to strong signal. According to the cascade theory of noise figure, the noise figure of the whole system is the smallest and the receiving sensitivity is excellent; in the strong signal scene, The second low-noise amplifier is in direct mode, which ensures that the receiver will not saturate under strong signal input; in extremely strong signal scenarios, the second low-noise amplifier is put in attenuation mode, which improves the maximum dynamic range of the receiver .
  • the final gain library is realized, as long as the gain is obeyed, the gain increases linearly from low to high according to the signal strength, and at the same time the recombined system gain and expansion
  • the gain error of the gain of the system gain is kept within the gdB range, and the state switching of Fig. 9A can be realized.
  • the target gain channel is a high gain channel and a low gain channel.
  • the gain formula of the system is as shown in formula 3.
  • i represents the first low-noise amplifier of the i-th stage, and the value can be 1, 2, 3, or 4.
  • a i, b i, c i , s i, t i, r i represents the i-th stage state value can be expressed as 0,1,0 operating state is in the first low-noise amplifier through state, 1 represents The working state of the first low noise amplifier is in the amplification state or the attenuation state.
  • AL i represents the gain value of the i-th stage first low noise amplifier in the low gain channel when it is in the attenuation state
  • KL i represents the gain value of the i-th stage first low noise amplifier in the low gain channel when it is in the through state
  • GL i represents the low The gain value of the i-th first low noise amplifier in the gain channel when it is in the amplified state
  • AH i represents the gain value of the i-th first low noise amplifier in the high gain channel when it is in the attenuated state
  • KH i represents the first low noise amplifier in the high gain channel
  • GH i represents the gain value of the first low noise amplifier of stage i in the high gain channel when it is in the amplified state.
  • g is the gain error of the system by default 5.
  • Table 4 is another eight-level gain level switching mapping table provided in an embodiment of the application. It can be seen from Table 4 that the target gain channel is a high-gain channel and a low-gain channel, that is, gain adaptive adjustment makes the target gain channel switch to a high-gain channel and a low-gain channel, and the gain state of each second low-noise amplifier is state0: Attenuation state, attenuation -4dB; state1: through state, attenuation 0dB; state2: gain state, gain 13dB.
  • the final gain library is realized. As long as the gain is obeyed, the gain increases linearly from low to high according to the signal strength. At the same time, the recombined system gain and The gain error of the expanded system gain is kept within the gdB range, and the state switching of Fig. 9B can be realized.
  • the wireless receiver includes a radio frequency pre-stage circuit and a radio frequency post-stage circuit.
  • the radio frequency pre-stage circuit includes a first filter, a second low-noise amplifier, and a second low-noise amplifier, wherein the first filter, the second low-noise amplifier, and the second low-noise amplifier are connected in sequence;
  • the radio-frequency post-circuit includes gain processing The circuit, the mixer, the A/D converter, the DVGA and the gain control circuit, wherein the gain processing circuit, the mixer, the A/D converter, the DVGA and the gain control circuit are connected in sequence.
  • the received signal estimation module in the gain control circuit evaluates the strength of the digital signal to obtain the RSSI value, and the control gain finite state machine determines the target working state of the second low noise amplifier according to the RSSI value, and controls the SSBI controller through the status word, SSBI The controller controls the second low-noise amplifier to work in the working state corresponding to the current digital signal strength according to the control word, that is, the target working state (through state or amplification state or attenuation state).
  • the gain finite state machine also determines the target gain channel of the gain processing circuit according to the RSSI value.
  • the gain processing circuit is controlled to be in the target gain channel by controlling and calling the radio frequency NV parameters, and the first low noise amplifiers are in the target working state (through state or amplified state).
  • the wireless receiver can continuously automatically adjust the gain control of the system according to the strength of the digital signal, thereby realizing the entire process of automatic gain control of the wireless receiver, and enabling the wireless receiver to receive and process radio frequencies with different signal strengths Signal, so that the wireless receiver can be used in a variety of different scenarios.
  • FIG. 10 is a wireless device provided by an embodiment of the application. As shown in FIG. 10, the wireless device includes a radio frequency antenna and a wireless receiver according to any one of the foregoing embodiments.
  • the radio frequency pre-stage circuit is connected to the radio frequency antenna, and the radio frequency post-stage circuit may or may not be arranged on the radio frequency chip, which is not limited in the embodiment of the present application.
  • the wireless device in this embodiment may be any wireless device with a radio frequency receiving function.
  • FIG. 10 only a mobile phone is used as an example for illustration.
  • the radio frequency pre-stage circuit includes a first filter, a second low noise amplifier, and a second filter.
  • the first filter is arranged on the second low noise amplifier.
  • the second filter is set at the output end of the second low-noise amplifier, and the output end of the second filter is connected to the input end of the RF post-circuit (the second filter can be set In the location close to the RF post-circuit).
  • the wireless receiver is useful in different wireless communication products. According to different application products, the wireless receiver of this embodiment can meet the requirements of different scenarios through automatic gain control.
  • the following examples are as follows:
  • Scenario 1 When the RF back-end circuit is very close to the antenna end (for example, less than 15mm), the second low noise amplifier can be controlled by the gain control circuit to make the second low-noise amplifier in a pass-through state.
  • the RF back-end circuit selects the lowest gain channel to meet the demand.
  • Scenario 2 When there is some distance (such as 20-40mm) between the RF back-end circuit and the antenna, the second low-noise amplifier can be controlled by the gain control circuit to make the second low-noise amplifier in a pass-through state, and the highest gain channel can be used for the RF back-end circuit Meet the demand.
  • the second low noise amplifier can be controlled by the gain control circuit to make the second low-noise amplifier in an amplified state, and the RF back-end circuit selects low gain
  • the channel, through the remapping of the gain, can meet the demand.
  • Scenario 4 When there is a long distance between the RF back-end circuit and the antenna (for example, greater than 70mm), the second low-noise amplifier can be controlled by the gain control circuit to make the second low-noise amplifier in an amplifying state, and the RF back-end circuit selects a high-gain channel , The demand can be met by remapping the gain.
  • scenario 1 to scenario 4 are only a few possible scenario illustrations, and there may be more other scenarios in actual applications, which are not limited in the embodiment of the present application.
  • the wireless device is used to implement the automatic gain control process of any of the above embodiments, and automatically adjust the gains of the RF pre-circuit and the RF post-circuit according to the signal strength received by the RF antenna to ensure that the wireless device can perform according to the actual application.
  • the scene performs adaptive state switching, that is, excellent receiving sensitivity under weak signals, wireless devices under strong signals are not easy to enter the saturation zone, and finally realize that wireless devices can receive and process a wider range of signals, which is suitable for a variety of different scenarios .

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Abstract

本申请提供一种无线接收机及无线设备。无线接收机包括：射频前级电路和射频后级电路。射频后级电路包括增益处理电路，增益处理电路包括多个增益通道，各增益通道对应的增益不同。射频前级电路用于从射频天线接收第一射频信号，并对第一射频信号进行处理，得到第二射频信号。射频后级电路用于通过增益处理电路中的一个或者多个增益通道对第二射频信号进行处理，得到第三射频信号，以使根据第三射频信号得到的数字信号的强度满足预设条件。

Description

无线接收机及无线设备
相关申请的交叉引用
本申请基于申请号为201911279284.1、申请日为2019年12月13日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此以引入方式并入本申请。
技术领域
本申请涉及无线通信技术，尤其涉及一种无线接收机及无线设备。
背景技术
无线接收机在射频通讯电路上有广泛的应用，目前无线接收机的射频处理方案已经非常成熟，但是随着应用场景的增多，对不同场景下的信号质量的要求越来越高。这样，无线接收机需要在不同的场景中接收并处理各种强度的射频信号。
无线接收机通常包括射频前级电路和射频后级电路。在一些情形下，为了使得无线接收机能够接收并处理较低强度的射频信号，通常会在射频前级电路中增加低噪放，通过低噪放对射频信号进行增益放大处理。
然而，上述情形中的无线接收机能够接收并处理的射频信号的强度范围依然受限，使得无线接收机无法应用于各种不同的场景中。
发明内容
本申请实施例提供一种无线接收机及无线设备，用以解决在一些情形下的无线接收机能够接收并处理的射频信号的强度范围受限，使得无线接收机无法应用于各种不同的场景中的问题。
本申请实施例提供一种无线接收机，包括：射频前级电路和射频后级电路。所述射频后级电路包括增益处理电路，所述增益处理电路包括多个增益通道，各所述增益通道对应的增益不同。所述射频前级电路用于从射频天线接收第一射频信号，并对所述第一射频信号进行处理，得到第二射频信号；所述射频后级电路用于通过所述增益处理电路中的一个或者多个所述增益通道对所述第二射频信号进行处理，得到第三射频信号，以使根据所述第三射频信号得到的数字信号的强度满足预设条件。
在一实施例中，每个所述增益通道包括级联设置的多个第一低噪声放大器，每个所述第一低噪声放大器包括三种工作状态：直通态、放大态、衰减态。
在一实施例中，所述射频前级电路包括第二低噪声放大器，所述第二低噪声放大器包括三种工作状态：直通态、放大态、衰减态。
在一实施例中，所述射频后级电路还包括：增益控制电路和串行总线接口SSBI控制器，所述SSBI控制器分别与所述增益控制电路和所述增益处理电路、所述第二低噪声放大器连接；
所述增益控制电路用于根据所述增益处理电路输出的所述第三射频信号对应的数字信号的强度，确定所述第二低噪声放大器的目标工作状态，并通过SSBI控制器控制所述第二低噪声放大器工作在所述目标工作状态。
在一实施例中，所述增益控制电路还用于根据所述数字信号的强度确定所述增益处理电路的目标增益通道，根据所述目标增益通道的系统增益以及所述第二低噪声放大器的目标工作状态对应的增益，确定所述目标增益通道中的各所述第一低噪声放大器各自对应的目标工作状态，并控制各所述第一低噪声放大器工作在各自对应的目标工作状态下。
在一实施例中，所述射频后级电路还包括：模数转换器A/D和数字可变增益放大器DVGA，所述增益处理电路、所述A/D、所述DVGA以及所述增益控制电路依次连接；
所述A/D用于对所述增益处理电路输出的所述第三射频信号进行模数转换，得到所述第三射频信号对应的数字信号；
所述DVGA用于向所述增益控制电路输出所述数字信号的强度；
所述DVGA还用于对所述数字信号进行增益放大，以使经过所述增益放大的数字信号的强度满足所述预设条件。
在一实施例中，所述增益处理电路和所述A/D之间还设置有混频器，所述混频器用于改变所述增益处理电路输出的所述第三射频信号的频率。
在一实施例中，所述射频前级电路还包括：第一滤波器，所述第一滤波器设置在所述第二低噪声放大器的输入端；
所述第一滤波器用于对从所述射频天线接收的所述第一射频信号进行滤波处理。
在一实施例中，所述射频前级电路还包括：第二滤波器，所述第二滤波器设置在所述第二低噪声放大器的输出端；
所述第二滤波器用于对所述第二低噪声放大器输出的所述第二射频信 号进行滤波处理。
本申请实施例提供一种无线设备，包括射频天线和如上所述的无线接收机；其中，所述射频前级电路与所述射频天线连接。
本申请实施例提供一种无线接收机包括：射频前级电路和射频后级电路；所述射频后级电路包括增益处理电路，所述增益处理电路包括多个增益通道，各所述增益通道对应的增益不同；所述射频前级电路用于从射频天线接收第一射频信号，并对所述第一射频信号进行处理，得到第二射频信号；所述射频后级电路用于通过所述增益处理电路中的一个或者多个所述增益通道对所述第二射频信号进行处理，得到第三射频信号，以使根据所述第三射频信号得到的数字信号的强度满足预设条件。由于射频后级电路包括的增益处理电路有多个增益通道，每一个增益通道对应不同的增益，使得无线接收机在接收到不同信号强度的信号时，可以选择不同的增益通道，以使所述第三信号对应的数字信号的强度满足预设条件，从而使得无线接收机可以接收不同信号强度的信号，增大了无线接收机能够接收并处理的射频信号的强度范围，使得无线接收机能应用于各种不同的场景中。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本申请实施例提供的一种无线接收机的结构示意图；
图2A为本申请实施例提供的一种低噪声放大器的结构示意图；
图2B为本申请实施例提供的另一种低噪声放大器的结构示意图；
图2C为本申请实施例提供的又一种低噪声放大器的结构示意图；
图3为本申请实施例提供的另一种无线接收机的结构示意图；
图4为本申请实施例提供的又一种无线接收机的结构示意图；
图5为本申请实施例提供的再一种无线接收机的结构示意图；
图6为本申请实施例提供的又一种无线接收机的结构示意图；
图7为本申请实施例提供的四级低噪声放大器增益切换示意图；
图8A为本申请实施例提供的一种增益匹配逻辑示意图；
图8B为本申请实施例提供的另一种增益匹配逻辑示意图；
图8C为本申请实施例提供的又一种增益匹配逻辑示意图
图9A为本申请实施例提供的一种有限状态机状态控制切换图；
图9B为本申请实施例提供的另一种有限状态机状态控制切换图；
图10为本申请实施例提供的一种无线设备结构示意图；
图11为本申请实施例提供的另一种无线设备结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本申请的实施例例如能够以除了在这里图示或描述的那些以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
下面以具体地实施例对本申请的技术方案进行详细说明。下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例不再赘述。
图1为本申请实施例提供的一种无线接收机的结构示意图，如图1所示，本实施例的无线接收机包括：射频前级电路和射频后级电路。
其中，射频后级电路包括增益处理电路，增益处理电路包括多个增益通道，各增益通道对应的增益不同。射频前级电路用于从射频天线接收第一射频信号，并对第一射频信号进行处理，得到第二射频信号；射频后级电路用于通过增益处理电路中的一个或者多个增益通道对第二射频信号进行处理，得到第三射频信号，以使根据第三射频信号得到的数字信号的强度满足预设条件。
本实施例中，射频前级电路是指位于射频收发信机(本实施例中也可以称为射频后级电路)和射频天线之间的电路。射频前级电路用于对从射频天线接收到的第一射频信号进行处理，并将得到的第二射频信号传输给射频收发信机，以使射频收发信机对第二射频信号进行后续的处理。
其中，射频前级电路可以包括：滤波器、低噪声放大器(Low Noise Amplifier，LNA)等。其中，滤波器用于滤除带外噪声或系统噪声。低噪声放大器也可以称为低噪放，是对接收信号的一种线性放大的射频器件，其核心的指标是工作频段、噪声系数(Noise Figure，简称NF)、增益和最大输入功率(这个是为了防止低噪放再大信号饱和，导致接收信号失真)。低噪声放大器用于对从射频天线接收到的第一射频信号进行增益处理。图2A和图2B为两种可能的低噪声放大器的结构示意图。如图2A所示，是一种不带直通功能的低噪声放大器，由一个使能端控制低噪声放大器处于工作状态或者关闭状态；如图2B所示，是一种带直通(bypass)功能的低噪声放大器，在芯片内部集成了一个开关通道，通过控制端来控制低噪声放大器处于信号放大工作状态还是处于信号直通工作状态。需要说明的是，图2A和图2B仅为两种可能的低噪放的结构示意，实际应用中还可以采用其他的结构，如图2C所示，本实施例对此不作限定。
射频后级电路是指位于射频前级电路和基带系统之间的电路。射频后级电路可以为射频收发信机对应的电路。射频后级电路用于对从射频前级电路接收到的第二射频信号进行处理，得到第三射频信号。其中，上述处理过程可以包括增益放大处理、混频处理等，使得得到的第三射频信号对应的数字信号的强度满足预设条件。预设条件可以是指数字信号的强度达到接收机中频信号的强度范围，即信号强度浮动在一定范围之间，避免出现信号紊乱。
如图1所示，射频后级电路包括多个增益通道，各增益通道对应的增益不同。示例性的，当包括两个增益通道时，两个增益通道可以分别为高增益通道和低增益通道，高增益通道对应的增益大于低增益通道对应的增益。当包括三个增益通道时，三个增益通道可以分别为高增益通道、中增益通道和低增益通道，高增益通道对应的增益大于中增益通道对应的增益，中增益通道对应的增益大于低增益通道对应的增益。当然，还可以包括更多数量的增益通道，本实施例对于增益通道的数量不作限定。
能够理解，当无线接收机应用于不同的场景时，或者即使是应用于同一场景时，在不同时刻无线接收机的射频天线接收到的第一射频信号的强度不同。本实施例中，当射频前级电路从射频天线接收到第一射频信号之后，射频前级电路先对第一射频信号进行处理，得到第二射频信号。然后，射频后级电路可以根据第二射频信号选择采用增益处理电路中的不同的增益通道对第二射频信号进行处理。例如：当第二射频信号 的强度较低时，可以采用高增益通道对第二射频信号进行处理，当第二射频信号的强度较高时，可以采用低增益通道对第二射频信号进行处理。这样，通过根据第二射频信号的强度采用不同的增益通道进行处理，能够保证得到的第三射频信号的强度在一定范围内，从而使得第三射频信号对应的数字信号的强度满足接收机中频信号的强度范围。
其中，射频后级电路对第二射频信号进行处理时，可以选择其中的一个增益通道，也可以选择其中的多个增益通道，本实施例对此不作限定。
本实施例中，无线接收机包括：射频前级电路和射频后级电路；射频后级电路包括增益处理电路，增益处理电路包括多个增益通道，各增益通道对应的增益不同；射频前级电路用于从射频天线接收第一射频信号，并对第一射频信号进行处理，得到第二射频信号；射频后级电路用于通过增益处理电路中的一个或者多个增益通道对第二射频信号进行处理，得到第三射频信号，以使根据第三射频信号得到的数字信号的强度满足预设条件。由于射频后级电路中的增益处理电路包括多个增益通道，各增益通道对应的增益不同，射频后级电路可以根据第二射频信号的强度选择采用增益处理电路中的不同的增益通道对第二射频信号进行处理，这样能够保证得到的第三射频信号的强度在一定范围内，从而使得第三射频信号对应的数字信号的强度满足预设条件，从而无线接收机能够接收并处理不同信号强度的射频信号，使得无线接收机可以应用于各种不同的场景中。
图3为本申请实施例提供的另一种无线接收机的结构示意图。在图1所示实施例的基础上，本实施例对于增益通道和射频前级电路的可能的结构进行详细说明。
无线接收机包括：射频前级电路和射频后级电路。
其中，射频后级电路包括增益处理电路，增益处理电路包括多个增益通道，各增益通道对应的增益不同；如图3所示，每个增益通道包括级联设置的多个第一低噪声放大器，每个第一低噪声放大器包括三种工作状态：直通态、放大态、衰减态。
本实施例中，对于每个增益通道中的第一低噪声放大器的数量不作限定。图3中以四级为例进行示意。如图3所示，每个增益通道包括级联设置的四个第一低噪声放大器，每个第一低噪声放大器包括三种工作状态：直通态、放大态、衰减态。示例性的，每个增益通道可以由四个第一低噪声放大器级联组成。有些场景中，每个增益通道还可以采用八个 第一低噪声放大器进行级联。能够理解，由四个低噪声放大器级联组成的增益通道处理的信号强度范围相对与由八个低噪声放大器级联组成的增益通道处理的信号强度范围小，增益通道里包括的第一低噪声放大器个数越多，处理的信号强度的范围越广。当然，还可以包括更多数量的第一低噪声放大器，本实施例对于第一低噪声放大器级联的个数不做限定。
能够理解，当无线接收机应用于不同的场景时，或者即使是应用于同一场景时，在不同时刻无线接收机的射频天线接收到的第一射频信号的强度不同。本实施例中，当射频前级电路从射频天线接收到第一射频信号之后，射频前级电路里的第二低噪声放大器先对第一射频信号进行处理，得到第二射频信号。然后，射频后级电路可以根据第二射频信号选择不同的增益通道，同时使得第一低噪声放大器处于不同的工作状态。例如：当第二射频信号的强度较低时，可以采用高增益通道，使高增益通道里级联的第一低噪声放大器中的一个或者多个处于放大态来处理第二射频信号，当第二射频信号的强度较高时，可以采用低增益通道，使低增益通道里级联的第一低噪声放大器中的一个或者多个处于衰减态来处理第二射频信号，当第二射频信号的强度适中时，可以选择高低增益通道里的任一增益通道，使增益通道里级联的第一低噪声放大器都处于直通态来处理第二射频信号。这样可以根据第二射频信号的强度采用不同的增益通道和不同工作状态的第一低噪声放大器进行处理。这样，通过根据第二射频信号的强度采用不同的增益通道及不同工作状态的第一低噪声放大器进行处理，能够保证得到的第三射频信号的强度在一定范围内，从而使得第三射频信号对应的数字信号的强度满足预设条件。
其中，射频后级电路对第二射频信号进行处理时，可以选择其中的一个增益通道，也可以选择其中的多个增益通道，本实施例对此不作限定。
本实施例中，由于每个增益通道包括级联设置的多个第一低噪声放大器，每个第一低噪声放大器包括三种工作状态：直通态、放大态、衰减态，那么就可以通过根据第二射频信号的强度采用不同的增益通道及不同工作状态的第一低噪声放大器进行处理，能够保证得到的第三射频信号的强度在一定范围内，从而使得第三射频信号对应的数字信号的强度满足预设条件，即使射频后级电路既可以处理弱信号，又可以处理强信号，增大了射频后级电路能够接收并处理射频信号的强度范围，从而增大无线接收机能够接收并处理的射频信号的强度范围，使得无线接收机可以应用于各种不同的场景中。
可选的，射频前级电路包括第二低噪声放大器，第二低噪声放大器包括三种工作状态：直通态、放大态、衰减态。
本实施例中，如图3所示，射频前级电路包括第二低噪声放大器。射频前级电路从射频天线接收到第一射频信号后，通过第二低噪声放大器对第一射频信号进行处理，得到第二射频信号。其中，第二低噪声放大器对第一射频信号进行处理时，可以进行信号直通处理、信号放大处理或信号衰减处理。示例性的，可以通过在第二低噪声放大器中集成控制模块，通过控制模块控制第二低噪声放大器是工作在直通态还是放大态还是衰减态。
能够理解，当无线接收机应用于不同的场景时，或者即使是应用于同一场景时，在不同时刻无线接收机的射频天线接收到的第一射频信号的强度不同。本实施例中，当射频前级电路从射频天线接收到第一射频信号之后，可以根据第一射频信号的强度选择第二低噪声放大器的工作状态。例如，当第一射频信号的强度较弱时，可以使第二低噪声放大器的工作状态处于放大态以得到第二射频信号，当第一射频信号的强度较强时，可以使第二低噪声放大器的工作状态处于衰减态以得到第二射频信号，当第一射频信号的强度中等时，可以使第二低噪声放大器的工作状态处于直通态态以得到第二射频信号。这样，通过根据第一射频信号的强度采用不同工作状态第二低噪声放大器进行处理，能够保证第二射频信号经过处理后得到第三射频信号的强度范围在一定范围内，从而使得第三射频信号对应的数字信号的强度满足预设条件。
本实施例中，由于射频前级电路还包括了第二低噪声放大器，第二低噪声放大器包括直通态、放大态、衰减态三种工作状态，那么就可以根据第一射频信号使得第二低噪声放大器处于不同的工作状态进行处理得到第二射频信号，增强射频前级电路的比较优良的接收性能，同时这样射频前级电路既可以处理弱信号，又可以处理强信号，增大了射频前级电路能够接收并处理射频信号的强度范围，从而增大无线接收机能够接收并处理的射频信号的强度范围，使得无线接收机可以应用于各种不同的场景中。
图4为本申请实施例提供的又一种无线接收机的结构示意图，在图3所示实施例的基础上，本实施例对于射频后级电路和射频前级电路的可能的结构进行详细说明。
无线接收机包括射频前级电路和射频后级电路。射频后级电路除了包括增益处理电路，还包括模数转换器(analog to digital converter，简称A/D转换器)和数字可变增益放大器(Digital Variable Gain Amplifier，简称 DVGA)，增益处理电路、A/D转换器、DVGA以及增益控制电路依次连接。
其中，A/D转换器用于对增益处理电路输出的第三射频信号进行模数转换，得到第三射频信号对应的数字信号；DVGA用于向增益控制电路输出数字信号的强度；DVGA还用于对数字信号进行增益放大，以使经过增益放大的数字信号的强度满足预设条件。
本实施例中，射频后级电路中的增益处理电路、A/D转换器、DVGA以及增益控制电路依次连接。其中，射频后级电路中的A/D转换器接收增益处理电路处理后的第三射频信号进行模拟信号转换为数字信号的处理，得到第三射频信号对应的数字信号，DVGA接收该数字信号进行进一步地增益放大处理，以使经过增益放大的数字信号的强度满足预设条件，并向增益控制电路输出数字信号的强度。
可选地，上述增益处理电路和A/D转换器之间还设置有混频器。
其中，混频器用于改变增益处理电路输出的第三射频信号的频率。
本实施例中，射频后级电路中的增益处理电路、混频器、A/D转换器、DVGA以及增益控制电路依次连接。其中，射频后级电路中的A/D转换器接收增益处理电路处理后的第三射频信号进行模拟信号转换为数字信号的处理，得到第三射频信号对应的数字信号，混频器对该数字信号进行变频处理得到中频数字信号，DVGA接收该中频数字信号进行进一步地增益放大处理，以使经过增益放大的数字信号的强度满足预设条件，并向增益控制电路输出数字信号的强度。
可选地，射频前级电路还包括：第一滤波器，第一滤波器设置在第二低噪声放大器的输入端。
其中，第一滤波器用于对从射频天线接收的第一射频信号进行滤波处理。
本实施例中，射频前级电路中的第一滤波器、第二低噪声放大器依次连接。其中，射频前级电路的第一滤波器对从射频天线接收的第一射频信号进行滤除带外噪声的处理，滤除带外噪声的第一射频信号经过第二低噪声放大器的增益处理后得到第二射频信号。其中，第二低噪声放大器对第一射频信号进行处理时，可以进行信号直通处理、信号放大处理或信号衰减处理。
可选地，射频前级电路还包括：第二滤波器，第二滤波器设置在第二低噪声放大器的输出端。
其中，第二滤波器用于对第二低噪声放大器输出的第二射频信号进行滤波处理。
本实施例中，射频前级电路中的第一滤波器、第二低噪声放大器、第二滤波器依次连接。其中，射频前级电路的第一滤波器对从射频天线接收的第一射频信号进行滤除带外噪声的处理，滤除带外噪声的第一射频信号经过第二低噪声放大器的增益处理后得到第二射频信号，第二射频信号经过第二滤波器滤除系统噪声的处理后输入到射频后级电路中。
本实施例中，射频前级电路包括第一滤波器、第二低噪声放大器、第二低噪声放大器，其中，第一滤波器、第二低噪声放大器、第二低噪声放大器依次连接；射频后级电路包括增益处理电路、混频器、A/D转换器、DVGA以及增益控制电路，其中，增益处理电路、混频器、A/D转换器、DVGA以及增益控制电路依次连接，射频前级电路的第一滤波器用于对从射频天线接收的第一射频信号进行滤除带外噪声，滤除带外噪声的第一射频信号经过第二低噪声放大器的增益处理后得到第二射频信号，第二射频信号再经过第二滤波器进行滤除系统噪声的处理后输入到射频后级电路增益处理电路中，射频后级电路的增益处理电路用于对第二射频信号进行处理得到第三射频信号，将得到的第三射频信号经过混频器的变频、A/D转换器的模拟信号转换为数字信号后得到第三射频信号对应的数字信号，再经过DVGA进行增益放大处理后向增益控制电路输出数字信号，以使经过增益放大的数字信号的强度满足预设条件，并将此满足预设条件的数字信号发送给增益控制电路以得到数字信号的强度。这样，经过上述处理后的数字信号强度一定(保持在一定的范围内)，实现优良的接收射频信号的处理。
图5为本申请实施例提供的再一种无线接收机的结构示意图，在图4所示实施例的基础上，本实施例对射频后级电路可能的结构进行详细说明。
射频后级电路还包括：增益控制电路和串行总线接口(Single-Wire Serial Bus Interface，简称SSBI)控制器。
其中，SSBI控制器分别与增益控制电路和第二低噪声放大器连接。增益控制电路用于根据增益处理电路输出的第三射频信号对应的数字信号的强度，确定第二低噪声放大器的目标工作状态，并通过SSBI控制器控制第二低噪声放大器工作在目标工作状态。
一种可能的实现方式，如图6所示，增益控制电路里包括：接收信号估计模块、增益有限状态机、射频NV参数、以及自动控制补偿控制模块。其中，接收信号估计模块根据增益处理电路输出的第三射频信号对应的数字信号的强度确定出对应的RSSI值，增益有限状态机根据增益处 理电路输出的第三射频信号对应的数字信号的强度该对应的RSSI值，确定第二低噪声放大器的目标工作状态，并通过状态字控制SSBI控制器，使SSBI控制器根据控制字控制第二低噪声放大器工作在当前RSSI值对应的工作状态，即目标工作状态(直通态或放大态或衰减态)。示例性的，RSSI<-100dBm，则第二低噪声放大器处于放大态。
其中，射频NV参数是用于控制射频功率或者射频接收信号强度等相关射频非遗失性参数，即non-volatile memory，包括由目标增益通道的当前系统增益以及第二低噪声放大器的目标工作状态对应的当前增益相加得出的当前RSSI对应的目标增益通道的系统增益。
可选地，增益控制电路还用于根据数字信号的强度确定增益处理电路的目标增益通道，根据目标增益通道的系统增益以及第二低噪声放大器的目标工作状态对应的增益，确定目标增益通道中的各第一低噪声放大器各自对应的目标工作状态，并控制各第一低噪声放大器工作在各自对应的目标工作状态下。
一种可能的实现方式，增益控制电路中的接收信号估计模块根据增益处理电路输出的第三射频信号对应的数字信号的强度确定出对应的RSSI值，增益有限状态机还根据该数字信号的强度对应的RSSI值确定增益处理电路的目标增益通道。示例性的，增益有限状态机根据表1或者表2中的RSSI值与目标增益通道的对应关系来确定增益处理电路的目标增益通道。确定了目标增益通道后，根据图7所示的四级低噪声放大器增益切换示意图确定出目标增益通道中的各第一低噪声放大器各自对应的目标工作状态，并控制调用射频NV参数使各第一低噪声放大器工作在各自对应的工作状态下。同时控制补偿控制模块控制DVGA对数字信号进行增益补偿，从而完成系统增益的自动控制。
对于上述实施例中目标增益通道的选择和第一、第二低噪声放大器的目标工作状态的确定，通过以下示例说明。
例如，针对一种信号强度的场景，如表1中的信号场景，同时使能高增益通道和低增益通道。表1为不同的信号场景对应的目标增益通道和第二低噪声放大器的映射关系。如表1所示，根据这张表系统就可以进行增益自适应调整，即根据实时监控到的信号强度状态，进行实时的对第一低噪放和第二低噪放的状态控制和切换，表中信号场景的RSSI的具体值是可根据实际系统的工作状态进行调整的。例如：RSSI<-100dBm，根据表1就可以知道第二低噪声放大器的工作状态为增益态，目标增益通道为高增益通道。再根据图7所示的四级低噪放增益切换示意图确定出目标增益通道中的各第一低噪声放大器各自对应的目标工作状态，并 控制调用射频NV参数使各第一低噪声放大器工作在各自对应的工作状态下，完成系统增益的自动控制。例如RSSI从小于-100dBm逐渐增大到-75dBm，目标增益通道的各第一低噪声放大器的工作状态由四级放大态切换到三级放大态。
表1
Figure PCTCN2020135917-appb-000001
针对另一种信号强度的场景，如表2中所示的信号场景，只使能高增益通道或低增益通道中的一个增益通道。表2为另一不同的信号场景对应的目标增益通道和第二低噪声放大器的映射关系。如表2所示，根据这张表系统就可以进行增益自适应调整，表中信号场景的RSSI的具体值是可根据实际系统的工作状态进行调整的。例如：RSSI<-85dBm，根据表2就可以知道第二低噪声放大器的工作状态为增益态，目标增益通道可以为高增益通道或低增益通道中的任一通道。再根据图7所示的四级低噪放增益切换示意图确定出目标增益通道中的各第一低噪声放大器各自对应的目标工作状态，并控制调用射频NV参数使各第一低噪声放大器工作在各自对应的工作状态下，完成系统增益的自动控制。例如RSSI从小于-85dBm逐渐增大到-75dBm，目标增益通道的各第一低噪声放大器的工作状态由四级增益态切换到三级增益态。
表2
Figure PCTCN2020135917-appb-000002
进一步地，目标增益通道的选择及射频NV参数里包括的目标增益通道的增益值的计算过程通过以下示例详细说明。
为了保证整个系统增益切换的平滑度，一种行之有效的方法就是调整 第二低噪声放大器和目标增益通道的增益，保证系统的总增益和目标增益通道的增益相匹配，可以允许有一部分的误差，其中g表示增益误差，一般来讲g＝5dB,也就是增益误差在5dB范围内不会对整个接收信号处理带来较大的影响，即将目标增益通道的系统增益以及第二低噪声放大器的目标工作状态对应的增益相加，计算出当前RSSI对应的目标增益通道的系统增益，将计算出的当前RSSI对应的目标增益通道的系统增益存储到射频NV参数里，以供增益自适应调节的时候直接调用。
图8A为本申请实施例提供的一种增益匹配逻辑示意图；图8B为本申请实施例提供的另一种增益匹配逻辑示意图；图8C为本申请实施例提供的又一种增益匹配示意逻辑示意图；图9A为本申请实施例提供的一种有限状态机状态控制切换图；图9B为本申请实施例提供的另一种有限状态机状态控制切换图。
一种可能实现的方式：目标增益通道为低增益通道，如图8A所示，或者，目标增益通道为高增益通道，如图8B所示。这种两种情况下，系统的总增益公式如下公式1或者公式2。
低增益通道增益：
GSL i’＝∑a i*AL i+b i*KL i+c i*GL i＝GSL i±g≈GSL i    (公式1)
其中，i表示的是第i级第一低噪声放大器，取值可以为1，2，3或4。ai,bi,ci表示的是第i级的状态，取值可以为0,1，0表示第一低噪声放大器的工作状态处于直通态，1表示第一低噪声放大器的工作状态处于放大态或者衰减态。ALi表示低增益通道里第i级第一低噪声放大器处于衰减态时的增益值，KLi表示低增益通道里第i级第一低噪声放大器处于直通态时的增益值，GLi表示低增益通道里第i级第一低噪声放大器处于放大态时的增益值。g为系统的增益误差默认是5。
高增益通道增益：
GSH i’＝∑a i*AH i+b i*KH i+c i*GH i＝GSH i±g≈GSL i    (公式2)
其中，i表示的是第i级第一低噪声放大器，取值可以为1，2，3或4。a i,b i,c i表示的是第i级的状态，取值可以为0,1，0表示第一低噪声放大器的工作状态处于直通态，1表示第一低噪声放大器的工作状态处于放大态或者衰减态。AH i表示高增益通道里第i级第一低噪声放大器处于衰减态时的增益值，KH i表示高增益通道里第i级第一低噪声放大器处于直通态时的增益值，GH i表示高增益通道里第i级第一低噪声放大器处于放大态时的增益值。g为系统的增益误差默认是5。
例如，表3为本申请实施例提供的八级增益等级切换的映射表。由表3可以看出目标增益通道为高增益通道，也就是通过增益自适应调整使得 目标增益通道切换到高增益通道，并且使得每个第一低噪放的增益等级为：GH1,GH2,GH4,GH5,GH6,GH7,GH6,GH6。同时根据表3可看出，第二低噪声放大器的增益等级为：G2,G2,G2,G2,G2,G2,G1,G0。各第二低噪声放大器的工作状态为state0：衰减态，衰减-4dB；state1：直通态，衰减0dB；state2：增益态，增益13dB。
表3
Figure PCTCN2020135917-appb-000003
第二低噪声放大器在前六级都是处于放大模式，第七级处于直通模式，第八级处于衰减模式。这样在弱信号到较强信号的场景下第二低噪声放大器一直处于放大状态，根据噪声系数的级联理论，整个系统工作的噪声系数最小，接收的灵敏度优良；在较强的信号场景下，第二低噪声放大器处于直通模式，保证了接收机在强信号输入下接收机不会饱和；在极强的信号场景下，第二低噪声放大器放处于衰减模式，提高了接收机的最大动态范围。
通过第二低噪声放大器的增益状态和高增益通道的增益状态的组合，实现最终的增益的库，只要服从增益根据信号强弱，从低到高线性增加，同时重新组合的系统增益和扩展之后的系统增益的增益误差保持在gdB范围之内，就可以实现图9A的状态切换。
另一种可能的实现方式：如图8C所示，目标增益通道为高增益通道和低增益通道，这种情况下，系统的增益公式如下公式3。
GS i’＝∑(a i*AL i+b i*KL i+c i*GL i)+∑(s i*AH i+t i*KHi+r i*GH i)＝GS i±g≈GS i    (公式3)
其中，i表示的是第i级第一低噪声放大器，取值可以为1，2，3或4。a i,b i,c i,s i,t i,r i表示的是第i级的状态，取值可以为0,1，0表示第一低噪声放大器的工作状态处于直通态，1表示第一低噪声放大器的工作状态处于放大态或者衰减态。AL i表示低增益通道里第i级第一低噪声放大器 处于衰减态时的增益值，KL i表示低增益通道里第i级第一低噪声放大器处于直通态时的增益值，GL i表示低增益通道里第i级第一低噪声放大器处于放大态时的增益值；AH i表示高增益通道里第i级第一低噪声放大器处于衰减态时的增益值，KH i表示高增益通道里第i级第一低噪声放大器处于直通态时的增益值，GH i表示高增益通道里第i级第一低噪声放大器处于放大态时的增益值。g为系统的增益误差默认是5。
例如，表4为本申请实施例提供的另一种八级增益等级切换的映射表。由表4可以看出目标增益通道为高增益通道和低增益通道，也就是增益自适应调整使得目标增益通道切换到高增益通道和低增益通道，各第二低噪声放大器的增益态为state0：衰减态，衰减-4dB；state1：直通态，衰减0dB；state2：增益态，增益13dB。
表4
Figure PCTCN2020135917-appb-000004
通过第二低噪声放大器的增益状态和高、低增益通道的增益状态的组合，实现最终的增益的库，只要服从增益根据信号强弱，从低到高线性 增加，同时重新组合的系统增益和扩展之后的系统增益的增益误差保持在gdB范围之内，就可以实现图9B的状态切换。
本实施例中，无线接收机包括射频前级电路和射频后级电路。射频前级电路包括第一滤波器、第二低噪声放大器、第二低噪声放大器，其中，第一滤波器、第二低噪声放大器、第二低噪声放大器依次连接；射频后级电路包括增益处理电路、混频器、A/D转换器、DVGA以及增益控制电路，其中，增益处理电路、混频器、A/D转换器、DVGA以及增益控制电路依次连接。增益控制电路中的接收信号估计模块对数字信号的强度进行评估得到RSSI值，控制增益有限状态机根据RSSI值确定出第二低噪声放大器的目标工作状态，并通过状态字控制SSBI控制器，SSBI控制器根据控制字控制第二低噪声放大器工作在当前数字信号强度对应的工作状态，即目标工作状态(直通态或放大态或衰减态)。增益有限状态机还根据RSSI值确定增益处理电路的目标增益通道，通过控制调用射频NV参数控制增益处理电路处于目标增益通道，并使各第一低噪声放大器处于目标工作状态(直通态或放大态或衰减态)，使得无线接收机可以根据数字信号的强度不断地自动调整系统的增益控制，从而实现无线接收机增益自动控制的整个流程，并且使得无线接收机能够接收并处理不同信号强度的射频信号，使得无线接收机可以应用于各种不同的场景中。
图10为本申请实施例提供的一种无线设备，如图10所示，无线设备包括射频天线和如上述任一实施例的无线接收机。
其中，射频前级电路与射频天线连接，射频后级电路可以设置在射频芯片上，也可以不设置在射频芯片上，本申请的实施例中对此不做限定。
需要说明的是，本实施例的无线设备可以为具有射频接收功能的任意无线设备，图10中仅以手机为例进行示意。
本实施例中，一种可能的结构示意图如图11所示，射频前级电路中包括第一滤波器，第二低噪声放大器，第二滤波器，第一滤波器设置在第二低噪声放大器的输入端(靠近射频天线的一侧)，第二滤波器设置在第二低噪声放大器的输出端，第二滤波器的输出端与射频后级电路的输入端连接(第二滤波器可以设置在靠近射频后级电路的位置)。
无线接收机在不同的无线通信类产品中都会有用到，根据应用产品的不同，本实施例的无线接收机可以通过自动增益控制满足不同场景的需求。下面举例如下：
场景1：射频后级电路非常靠近天线端(比如小于15mm)时，可以通过 增益控制电路的控制，使得第二低噪声放大器处于直通状态，射频后级电路选用最低增益的通道即可满足需求。
场景2：射频后级电路和天线之间存在一些距离(比如20-40mm)时，可以通过增益控制电路的控制，使得第二低噪声放大器处于直通状态，射频后级电路选用最高增益通道即可满足需求。
场景3：射频后级电路和天线之间的存在较远的距离(比如50-60mm)时，可以通过增益控制电路的控制，使得第二低噪声放大器处于放大状态，射频后级电路选用低增益通道，通过增益的重新映射，即可满足需求。
场景4：射频后级电路和天线之间的存在很远的距离(比如大于70mm)时，可以通过增益控制电路的控制，使得第二低噪声放大器处于放大状态，射频后级电路选用高增益通道，通过增益的重新映射，即可满足需求。
上述场景1至场景4仅为几种可能的场景示意，实际应用中还可以存在其他的更多的场景，本申请实施例对此不做限定。
本实施例中，无线设备用来实现上述任一实施例的增益自动控制流程，根据射频天线接收的信号强度自动调整射频前级电路和射频后级电路的增益，确保无线设备能根据实际应用的场景进行自适应的状态切换，即弱信号下优良的接收灵敏度，强信号下的无线设备不容易进入饱和区，最终实现无线设备能够接收并处理更广范围的信号，适用于各种不同的场景。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (10)

  1. 一种无线接收机，包括：射频前级电路和射频后级电路；
    所述射频后级电路包括增益处理电路，所述增益处理电路包括多个增益通道，各所述增益通道对应的增益不同；
    所述射频前级电路用于从射频天线接收第一射频信号，并对所述第一射频信号进行处理，得到第二射频信号；
    所述射频后级电路用于通过所述增益处理电路中的一个或者多个所述增益通道对所述第二射频信号进行处理，得到第三射频信号，以使根据所述第三射频信号得到的数字信号的强度满足预设条件。
  2. 根据权利要求1所述的无线接收机，其中，每个所述增益通道包括级联设置的多个第一低噪声放大器，每个所述第一低噪声放大器包括三种工作状态：直通态、放大态、衰减态。
  3. 根据权利要求2所述的无线接收机，其中，所述射频前级电路包括第二低噪声放大器，所述第二低噪声放大器包括三种工作状态：直通态、放大态、衰减态。
  4. 根据权利要求3所述的无线接收机，其中，所述射频后级电路还包括：增益控制电路和串行总线接口SSBI控制器，所述SSBI控制器分别与所述增益控制电路和所述增益处理电路、所述第二低噪声放大器连接；
    所述增益控制电路用于根据所述增益处理电路输出的所述第三射频信号对应的数字信号的强度，确定所述第二低噪声放大器的目标工作状态，并通过SSBI控制器控制所述第二低噪声放大器工作在所述目标工作状态。
  5. 根据权利要求4所述的无线接收机，其中，
    所述增益控制电路还用于根据所述数字信号的强度确定所述增益处理电路的目标增益通道，根据所述目标增益通道的系统增益以及所述第二低噪声放大器的目标工作状态对应的增益，确定所述目标增益通道中的各所述第一低噪声放大器各自对应的目标工作状态，并控制各所述第一低噪声放大器工作在各自对应的目标工作状态下。
  6. 根据权利要求5所述的无线接收机，其中，所述射频后级电路还包括：模数转换器A/D和数字可变增益放大器DVGA，所述增益处理电路、所述A/D、所述DVGA以及所述增益控制电路依次连接；
    所述A/D用于对所述增益处理电路输出的所述第三射频信号进行模数转换，得到所述第三射频信号对应的数字信号；
    所述DVGA用于向所述增益控制电路输出所述数字信号的强度；
    所述DVGA还用于对所述数字信号进行增益放大，以使经过所述增益放大的数字信号的强度满足所述预设条件。
  7. 根据权利要求6所述的无线接收机，其中，所述增益处理电路和所述A/D之间还设置有混频器，所述混频器用于改变所述增益处理电路输出的所述第三射频信号的频率。
  8. 根据权利要求3至7任一项所述的无线接收机，其中，所述射频前级电路还包括：第一滤波器，所述第一滤波器设置在所述第二低噪声放大器的输入端；
    所述第一滤波器用于对从所述射频天线接收的所述第一射频信号进行滤波处理。
  9. 根据权利要求8所述的无线接收机，其中，所述射频前级电路还包括：第二滤波器，所述第二滤波器设置在所述第二低噪声放大器的输出端；
    所述第二滤波器用于对所述第二低噪声放大器输出的所述第二射频信号进行滤波处理。
  10. 一种无线设备，包括射频天线和如权利要求1至9任一项所述的无线接收机；
    其中，所述射频前级电路与所述射频天线连接。
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