CN108418594B - Multipurpose high signal-to-noise ratio type Internet of things radio frequency circuit, circuit board, chip and terminal - Google Patents

Multipurpose high signal-to-noise ratio type Internet of things radio frequency circuit, circuit board, chip and terminal Download PDF

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CN108418594B
CN108418594B CN201810099443.9A CN201810099443A CN108418594B CN 108418594 B CN108418594 B CN 108418594B CN 201810099443 A CN201810099443 A CN 201810099443A CN 108418594 B CN108418594 B CN 108418594B
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circuit
filter device
filter
transistor
inductor
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CN108418594A (en
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杜光东
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Shenzhen Shenglu IoT Communication Technology Co Ltd
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Shenzhen Shenglu IoT Communication Technology Co Ltd
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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
    • 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
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • 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
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements
    • 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
    • H04B1/1607—Supply circuits

Abstract

The embodiment of the invention discloses a radio frequency signal receiving circuit, a circuit board, a chip and an Internet of things terminal, wherein the circuit comprises: the antenna comprises an antenna circuit, a first filter circuit, a switch circuit, a second filter circuit, an improved low-noise amplification circuit and an improved mixing circuit; the output end of the antenna circuit is connected with the input end of the first filter circuit, the output end of the first filter circuit is connected with the input end of the switch circuit, the output end of the switch circuit is connected with the input end of the second filter circuit, the output end of the second filter circuit is connected with the input end of the improved low-noise amplification circuit, and the output end of the improved low-noise amplification circuit is connected with the improved mixing circuit; the improved low-noise amplifying circuit comprises an amplifying circuit and a matching degree improving circuit, wherein the matching degree improving circuit is used for improving impedance matching in the low-noise amplifying circuit. The circuit can improve the signal processing effect of the modem to a certain extent.

Description

Multipurpose high signal-to-noise ratio type Internet of things radio frequency circuit, circuit board, chip and terminal
Technical Field
The invention relates to the technical field of circuit structures, in particular to a multipurpose high-signal-to-noise-ratio type Internet of things radio frequency circuit, a circuit board, a chip and an Internet of things terminal.
Background
The internet of things is an important component of a new generation of information technology and also an important development stage of the 'informatization' era, and the internet of things is widely applied to the fusion of networks through communication perception technologies such as intelligent perception and identification technologies and pervasive computing, and is also called as a third wave of development of the world information industry after computers and the internet.
The rapid development and application of the internet of things technology mean that the requirement on the communication technology is higher and higher, and the transmission of communication signals faces greater and greater challenges. How to reduce the noise of signal transmission in a complex environment and reduce the power loss in long-distance transmission is an important problem to be solved urgently in the application of the internet of things.
Disclosure of Invention
The embodiment of the invention provides a multipurpose high-signal-to-noise-ratio type Internet of things radio frequency circuit, a circuit board, a chip and an Internet of things terminal, which can improve the signal-to-noise ratio of a received signal to a certain extent and further improve the signal processing effect of a modem to a certain extent.
A first aspect of an embodiment of the present invention provides an internet of things radio frequency signal receiving circuit, where the circuit includes: the antenna comprises an antenna circuit, a first filter circuit, a switch circuit, a second filter circuit, an improved low-noise amplification circuit and an improved mixing circuit;
the first filter circuit includes: the first filter device, the second filter device, the third filter device, the fourth filter device, the fifth filter device, the sixth filter device and the seventh filter device;
the first end of the first filter device is connected with the first end of the second filter device, the second end of the first filter device is connected with the first end of the third filter device, the second end of the second filter device is connected with the first end of the fourth filter device and the first end of the fifth filter device, the second end of the third filter device is connected with the second end of the fourth filter device and the first end of the sixth filter device, the second end of the fifth filter device is connected with the first end of the seventh filter device, and the second end of the sixth filter device is connected with the second end of the seventh filter device;
the output end of the antenna circuit is connected with the input end of the first filter circuit, the output end of the first filter circuit is connected with the input end of the switch circuit, the output end of the switch circuit is connected with the input end of the second filter circuit, the output end of the second filter circuit is connected with the input end of the low-noise amplification circuit, and the output end of the low-noise amplification circuit is connected with the mixing circuit.
Optionally, the first filter circuit further includes: the eighth filter, the ninth filter, the tenth filter and the eleventh filter;
the first end of eighth filter with antenna circuit's output is connected, the second end of eighth filter with the first end of ninth filter and the first end of tenth filter are connected, the second end of ninth filter with the first end of eleventh filter is connected, the second end of tenth filter with the second end of eleventh filter is connected.
Optionally, the first filter circuit further includes: a twelfth filter device, a thirteenth filter device, a fourteenth filter device, a fifteenth filter device, a sixteenth filter device, and a seventeenth filter device;
a first end of the twelfth filter device is connected with an output end of the antenna path, a second end of the twelfth filter device is connected with a first end of the thirteenth filter device and a first end of the fourteenth filter device, a second end of the thirteenth filter device is connected with a first end of the fifteenth filter device and a first end of the sixteenth filter device, and a second end of the fourteenth filter device is connected with a second end of the sixteenth filter device and a second end of the seventeenth filter device; and the second end of the fifteenth filter device is connected with the first end of the seventeenth filter device.
The first filter circuit can enable the filter circuit to have good frequency selection characteristics through the cascade connection of the plurality of filter devices, the filter effect is enhanced to a certain extent, and the signal quality is improved through the promotion of the inhibition of out-of-band signals.
Optionally, the improved low-noise amplifying circuit includes a first amplifying circuit and a first matching degree boosting circuit, where the first amplifying circuit includes a first power supply, a second power supply, a third power supply, a first inductor, a second inductor, a third inductor, a first field-effect transistor, a second field-effect transistor, and a first capacitor;
the output of first power with the first end of first inductance is connected, the second end of first inductance with first field effect transistor's grid is connected, first field effect transistor's source with the first end of second inductance is connected, the second end ground connection of second inductance, the output of second power with the input of first matching degree lifting circuit and second field effect transistor's grid are connected, the output ground connection of first matching degree lifting circuit, the source of second field effect transistor with the drain electrode of first field effect transistor is connected, the drain electrode of second field effect transistor with the first end of first electric capacity and the first end of third inductance are connected, the second end of third inductance with the output of third power is connected.
Optionally, the first matching degree improving circuit includes a first resistor and a second capacitor, and the first resistor is connected in series with the second capacitor.
Optionally, the improved low-noise amplifying circuit includes a second amplifying circuit and a second matching degree boosting circuit, where the second amplifying circuit includes a fourth power supply, a fifth power supply, a sixth power supply, a fourth inductor, a fifth inductor, a sixth inductor, a third field-effect transistor, a fourth field-effect transistor, and a second capacitor;
the output of fourth power with the first end of fourth inductance is connected, the second end of fourth inductance with the grid of third field effect transistor and the first end of second matching degree lifting circuit are connected, the second end of second matching degree lifting circuit with the first end of fifth inductance and the source connection of third field effect transistor, the second end ground connection of fifth inductance, the drain electrode of third field effect transistor with the source connection of fourth field effect transistor, the grid of fourth field effect transistor with the output of fifth power is connected, the drain electrode of fourth field effect transistor with the first end of sixth inductance and the first end of third electric capacity are connected, the second end of sixth inductance with the output of sixth power is connected.
The circuit is characterized in that the matching degree improving circuit is connected in parallel at the input end of the low-noise amplifier, so that the influence of the noise amplifier on the amplifying circuit can be reduced, and the signal-to-noise ratio of the output of the amplifier is improved.
Optionally, the improved mixer circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a fourth capacitor, a fifth capacitor, a second resistor, a third resistor, a seventh inductor, and an eighth inductor;
a source of the first transistor is connected to a source of the second transistor and ground, a drain of the first transistor is connected to a first terminal of the seventh inductor, a source of a third transistor and a source of a fourth transistor, a second end of the seventh inductor is connected with a first end of the fourth capacitor and a first power supply, a second end of the fourth capacitor is grounded, a drain of the third transistor is connected to the second resistor, a gate of the fourth transistor is connected to a gate of the fifth transistor, a drain of the second transistor is connected to a first terminal of the eighth inductor, a source of the fifth transistor, and a source of the sixth transistor, a second terminal of the eighth inductor is connected to the second power supply and a first terminal of the fifth capacitor, a second end of the fifth capacitor is grounded, and a drain of the sixth transistor is connected with the third resistor.
The mixer circuit stabilizes the static operating point of the transistor by adding a single power supply bias circuit to the drain of the transistor.
A second aspect of the embodiments of the present invention provides a chip, where the chip includes a processor, a power circuit, and an internet of things radio frequency signal receiving circuit provided in any of the first aspects or any possible implementation manner of the first aspect.
A third aspect of an embodiment of the present invention provides a circuit board including a modem, a signal processor, and the chip provided by the second aspect of the embodiment of the present invention.
A fourth aspect of the embodiments of the present invention provides a terminal including a housing and a circuit board provided by the third aspect of the embodiments of the present invention.
The embodiment of the invention has the following beneficial effects:
the input end of the switch circuit is connected with the first filter circuit in series, the output end of the switch circuit is connected with the second filter circuit in series, and a plurality of filter devices of the second filter circuit are connected through a certain structure, so that a better frequency selection effect is achieved, further filtering is performed on noise signals in a targeted manner, and the signal-to-noise ratio of the signals in the circuit is improved. The input end of the low-noise amplifier is connected with the matching degree improving circuit in parallel, so that the influence of the noise amplifier on the amplifying circuit can be reduced, and the signal-to-noise ratio of the output of the amplifier is improved. In addition, the improved mixing circuit adopts a double-balanced mixing circuit, and single power supply bias is added to the drain electrode of the transistor, so that the static operating point of the transistor is stabilized.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings used in the description of the embodiment will be briefly introduced below.
Fig. 1 is a radio frequency signal receiving circuit of the internet of things according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first filter circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a possible first filter circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another possible first filter circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an improved low noise amplifier circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a matching degree improving circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of another improved low noise amplifier circuit according to an embodiment of the present invention;
fig. 8 is a schematic diagram of an improved mixer circuit according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a possible structure of a chip according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a possible structure of a circuit board according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by the person skilled in the art that the described embodiments of the invention can be combined with other embodiments.
Referring to fig. 1, fig. 1 provides an internet of things radio frequency signal receiving circuit according to an embodiment of the present invention. As shown in fig. 1, the circuit includes: an antenna circuit 101, a first filter circuit 102, a switch circuit 103, a second filter circuit 104, a modified low-noise amplification circuit 105, and a modified mixer circuit 106;
referring to fig. 2, fig. 2 is a schematic structural diagram of a first filter circuit according to an embodiment of the present invention, and as shown in fig. 2, the first filter circuit includes: a first filter device F1, a second filter device F2, a third filter device F3, a fourth filter device F4, a fifth filter device F5, a sixth filter device F6, and a seventh filter device F7;
the first end of the first filter device F1 is connected with the first end of the second filter device F2, the second end of the first filter device F1 is connected with the first end of the third filter device F3, the second end of the second filter device F2 is connected with the first end of the fourth filter device F4 and the first end of the fifth filter device F5, the second end of the third filter device F3 is connected with the second end of the fourth filter device F4 and the first end of the sixth filter device F6, the second end of the fifth filter device F5 is connected with the first end of the seventh filter device F7, and the second end of the sixth filter device F6 is connected with the second end of the seventh filter device F7;
the output end of the antenna circuit 101 is connected with the input end of the first filter circuit 102, the output end of the first filter circuit 102 is connected with the input end of the switch circuit 103, the output end of the switch circuit 103 is connected with the input end of the second filter circuit 104, the output end of the second filter circuit 104 is connected with the input end of the improved low-noise amplification circuit 105, and the output end of the improved low-noise amplification circuit 105 is connected with the improved mixer circuit 106;
the improved low-noise amplification circuit 105 includes an amplification circuit 1052 and a matching degree boosting circuit 1051 for boosting impedance matching in the low-noise amplification circuit.
According to the embodiment of the invention, the input end of the switch circuit is connected with the first filter circuit in series, the output end of the switch circuit is connected with the second filter circuit in series, and the plurality of filter devices of the second filter circuit are connected through a certain structure, so that a better frequency selection effect is achieved, further noise signals are filtered in a targeted manner, and the signal-to-noise ratio of the signals in the circuit is improved. The matching degree improving circuit is connected in parallel with the input end of the low-noise amplifier, so that the influence of the noise amplifier on the amplifying circuit can be reduced, and the signal-to-noise ratio of the output of the amplifier is further improved.
Optionally, referring to fig. 3, fig. 3 is a schematic structural diagram of a possible first filter circuit according to an embodiment of the present invention, and as shown in fig. 3, the first filter circuit includes: an eighth filter device F8, a ninth filter device F9, a tenth filter device F10, and an eleventh filter device F11;
the first end of eighth filter device F8 is connected with antenna circuit's output, and the second end of eighth filter device F8 is connected with the first end of ninth filter device F9 and the first end of tenth filter device F10, and the second end of ninth filter device F9 is connected with the first end of eleventh filter device F11, and the second end of tenth filter device F10 is connected with the second end of eleventh filter device F11. The signal is input into the circuit through Vin and finally output as the output voltage Vout through the voltage across the eleventh filter device F11.
Optionally, referring to fig. 4, fig. 4 is a schematic structural diagram of another possible first filter circuit according to an embodiment of the present invention. As shown in fig. 4, the first filter circuit includes: a twelfth filter device F12, a thirteenth filter device F13, a fourteenth filter device F14, a fifteenth filter device F15, a sixteenth filter device F16, and a seventeenth filter device F17;
the first end of the twelfth filter device F12 is connected with the output end of the antenna circuit, the second end of the twelfth filter device F12 is connected with the first end of the thirteenth filter device F13 and the first end of the fourteenth filter device F14, the second end of the thirteenth filter device F13 is connected with the first end of the fifteenth filter device F15 and the first end of the sixteenth filter device F16, and the second end of the fourteenth filter device F14 is connected with the second end of the sixteenth filter device F16 and the second end of the seventeenth filter device F17; a second end of the fifteenth filter device F15 is connected to a first end of the seventeenth filter device F17. The signal is input into the circuit through Vin and finally output as the output voltage Vout through the voltage across the seventeenth filter device F17.
Optionally, the first filter circuit may be a surface acoustic wave filter circuit, and correspondingly, the filter device is a surface acoustic wave filter device. Furthermore, all the filter devices F1-F17 can be resonance units, and a trapezoidal surface acoustic wave filter circuit is formed by the series connection and the parallel connection of the resonance units, so that the filter has the characteristics of small size, small power consumption, small in-band attenuation and the like. The material for manufacturing the surface acoustic wave filter can be quartz crystal, piezoelectric ceramic and other piezoelectric materials, and a stable and steep band-pass curve can be obtained.
In the above possible connection structure of the first filter circuit, the connection structure includes a plurality of cascade connection modes, the series connection of the filters can improve the filtering effect on the corresponding branch, and the series connection of the filters can improve the stability of the filter circuit. In addition, the increase of the filter order can make the passing bandwidth narrower, and further make the filtering effect better. However, the increase of the number of stages also increases the insertion loss, and the problem of high manufacturing difficulty exists in use, and the number of stages of the filter can be selected according to specific situations in practical application.
Referring to fig. 5, fig. 5 is a schematic diagram of an improved low noise amplifier circuit according to an embodiment of the present invention, as shown in fig. 5, the low noise amplifier circuit includes a first power supply 501, a second power supply 502, a third power supply 503, a first inductor L1, a second inductor L2, a third inductor L3, a first field effect transistor T1, a second field effect transistor T2, a first capacitor C1, and a first matching degree boost circuit 504. An output end of the first power source 401 is connected to a first end of a first inductor L1, a second end of the first inductor L1 is connected to a gate of a first field effect transistor T1, a source of the first field effect transistor T1 is connected to a first end of a second inductor L2, a second end of the second inductor L2 is grounded, an output end of the second power source 502 is connected to an input end of the first matching circuit 504 and a gate of a second field effect transistor T2, an output end of the first matching circuit 504 is grounded, a source of the second field effect transistor T2 is connected to a drain of the first field effect transistor T1, a drain of the second field effect transistor T2 is connected to a first end of the first capacitor C1 and a first end of a third inductor L3, and a second end of the third inductor L3 is connected to an output end of the third power source 503.
The signal is input into the low-noise amplifying circuit from the input end in, the first inductor filters a high-frequency signal in the input signal, then the signal flows through the grid electrode of the first field effect transistor to reach the drain electrode and is input into the second field effect transistor through the source electrode of the second field effect transistor, the front end of the second field effect transistor is connected with the first matching degree improving circuit in parallel, impedance matching between a signal source and a load can be improved, power loss and circuit reflection are reduced, the signal passes through the drain electrode of the second field effect transistor and is filtered through the first capacitor, an amplified output signal is obtained from the output end out, and the signal-to-noise ratio of the circuit is improved.
Optionally, fig. 6 is a schematic structural diagram of a matching degree improving circuit according to an embodiment of the present invention, where the matching degree improving circuit in fig. 6 or fig. 6 includes a capacitor and a resistor, as shown in fig. 6, the matching degree improving circuit 601 includes a first resistor R1 and a second capacitor C2, the first resistor R1 is connected in series with the second capacitor C2, and an input end and an output end of the matching degree improving circuit 601 are respectively connected in parallel with the low noise amplifying circuit. A signal is input from the input terminal in, flows through the first resistor and the second capacitor, and is output from the output terminal out.
Optionally, the second capacitor in the matching degree improving circuit includes a paper dielectric capacitor, a mica capacitor or a ceramic capacitor. The paper dielectric capacitor has the advantages of large ratio capacitance, wide capacitance range, high working voltage, low cost and the like, and the mica capacitor has the advantages of small dielectric loss, large insulation resistance, small temperature coefficient and the like, and is suitable for the high-frequency circuit in the embodiment of the invention. The ceramic capacitor has the advantages of high use temperature, large specific capacity, good moisture resistance, small dielectric loss, large-range selection of temperature coefficient of the capacitor and the like, and can be suitable for the circuit in the embodiment of the invention.
Optionally, referring to fig. 7, fig. 7 is a schematic diagram of another improved low noise amplifier circuit structure according to an embodiment of the present invention. As shown in fig. 7, the low noise amplifier circuit includes a second amplifier circuit and a second matching degree boosting circuit 704, wherein the second amplifier circuit includes a fourth power source 701, a fifth power source 702, a sixth power source 703, a fourth inductor L4, a fifth inductor L5, a sixth inductor L6, a third field effect transistor L3, a fourth field effect transistor L4, and a second capacitor C2. An output end of the fourth power source 701 is connected to a first end of a fourth inductor L4, a second end of the fourth inductor L4 is connected to a gate of a third field effect transistor T3 and a first end of a second matching degree increasing circuit 704, a second end of the second matching degree increasing circuit 704 is connected to a first end of a fifth inductor L5 and a source of a third field effect transistor T3, a second end of the fifth inductor L5 is grounded, a drain of the third field effect transistor T3 is connected to a source of the fourth field effect transistor T4, a gate of the fourth field effect transistor T4 is connected to an output end of the fifth power source 702, a drain of the fourth field effect transistor T4 is connected to a first end of the sixth inductor L6 and a first end of a second capacitor C2, and a second end of the sixth inductor L6 is connected to an output end of the sixth power source 703.
The signal is input into the low-noise amplification circuit from the input end in, flows through the fourth inductor, the second matching degree improving circuit, the third field effect transistor, the fifth inductor, the fourth field effect transistor, the sixth inductor and the third capacitor, and is output from the output end out. The circuit comprises an amplifying circuit and a matching degree improving circuit, wherein the matching degree improving circuit is connected in parallel at the input end of the amplifying circuit, so that impedance matching between a signal source and a load can be realized, the output power reaches the maximum value, and the power loss is reduced. The matching degree improving circuit can comprise a capacitor and a resistor, and is used for matching a load resistor with a transmission line, so that the reflection problem in the low-noise amplifying circuit can be further prevented, and the transmission efficiency is ensured. Optionally, the second matching degree increasing circuit may also be implemented by connecting a resistor and a capacitor in series.
The input end of the low-noise amplifying circuit is connected with a matching degree improving circuit consisting of a capacitor and a resistor in parallel, so that the low-noise amplifying circuit can be matched with the impedance of a signal source, the precision of the amplifying circuit is improved, and the maximum signal power can be obtained from the outside.
Optionally, referring to fig. 8, fig. 8 is a schematic diagram of an improved mixer circuit according to an embodiment of the present invention. As shown in fig. 8, the improved mixer circuit includes a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a fifth transistor M5, a sixth transistor M6, a fourth capacitor C4, a fifth capacitor C5, a second resistor R2, a third resistor R3, a seventh inductor L7, an eighth inductor L8, a first power source S1, and a second power source S2;
a source of the first transistor M1 is connected to the source of the second transistor M2 and the ground, a drain of the first transistor M1 is connected to a first end of the seventh inductor L7, a source D of the third transistor M3 is connected to a source of the fourth transistor M4, a second end of the seventh inductor L7 is connected to a first end of the fourth capacitor C4 and the first power source S1, a second end of the fourth capacitor C4 is connected to the ground, a drain of the third transistor M3 is connected to the second resistor R2, a gate of the fourth transistor M4 is connected to a gate of the fifth transistor M5, a drain of the second transistor M2 is connected to a first end of the eighth inductor L8, a source of the fifth transistor M5 and a source of the sixth transistor M6, a second end of the eighth inductor L8 is connected to the second power source S2 and a first end of the fifth inductor L5, and a second end of the fifth capacitor C5 is connected to the ground, the drain of the sixth transistor M6 is connected to the third resistor R3. Wherein, radio frequency signals are input from a grid of M1 and a grid of M2, local oscillation signals are input from a grid of M4, a grid of M5, a grid of M3 and a grid of M6, and the signals flow through M3, M4, M5 and M6 and are output from a drain of M4 and a drain of M5.
The improved mixing circuit is a double-balanced mixing circuit, the double-balanced mixing circuit has the advantages of high isolation performance, large linear range and the like, can have good vibration isolation performance on local oscillation frequency and intermediate frequency signals, improves the signal-to-noise ratio, and stabilizes the static working point of the transistor by serially connecting single power supply offsets at the drain electrodes of the first transistor and the second transistor.
In another embodiment of the present invention, a chip is provided, which includes the rf signal receiving circuit, the power circuit and the processor as described in fig. 1. Referring to fig. 9, fig. 9 is a schematic diagram of a possible structure of a chip according to an embodiment of the invention. As shown in fig. 9, the chip includes: a power supply circuit 801, a processor 802, and a radio frequency signal receiving circuit 803. The power Circuit 801 mainly functions to provide power to the chip, the Processor 802 may be, for example, a Central Processing Unit (CPU), a general purpose Processor (CPU), a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other Programmable logic device, hardware component, or any combination thereof, and the rf Signal receiving Circuit 803 is any one of the circuits described in the above embodiments.
Another embodiment of the present invention provides a circuit board including a modem, a baseband signal processor, and the chip provided in the above embodiment. Referring to fig. 10, fig. 10 is a schematic diagram of a possible structure of a circuit board according to an embodiment of the present invention. As shown in fig. 10, the circuit board includes: a modem 901, a signal processor 902, a chip 903, and a bus 904. The modem 901, the signal processor 902, and the chip 903 are connected by a bus 904. The modem 901 is mainly used for processing a baseband signal of a wireless signal processed by the chip 903, the signal processor 902 is mainly used for processing a signal demodulated by the modem 901, and the chip 903 is mainly used for processing a wireless radio frequency signal to obtain a baseband signal.
In another embodiment of the present invention, a terminal is provided, which includes the above circuit board and a housing.
The above embodiments are only intended to be illustrative of the embodiments of the present invention, and should not be construed as limiting the scope of the embodiments of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the embodiments of the present invention should be included in the scope of the embodiments of the present invention.

Claims (5)

1. An thing networking radio frequency signal receiving circuit, its characterized in that, thing networking radio frequency signal receiving circuit includes: the antenna comprises an antenna circuit, a first filter circuit, a switch circuit, a second filter circuit, an improved low-noise amplification circuit and an improved mixing circuit;
the output end of the antenna circuit is connected with the input end of the first filter circuit, the output end of the first filter circuit is connected with the input end of the switch circuit, the output end of the switch circuit is connected with the input end of the second filter circuit, the output end of the second filter circuit is connected with the input end of the improved low-noise amplification circuit, and the output end of the improved low-noise amplification circuit is connected with the improved mixer circuit;
the first filter circuit includes: the first filter device, the second filter device, the third filter device, the fourth filter device, the fifth filter device, the sixth filter device and the seventh filter device;
the first end of the first filter device is connected with the first end of the second filter device, the second end of the first filter device is connected with the first end of the third filter device, the second end of the second filter device is connected with the first end of the fourth filter device and the first end of the fifth filter device, the second end of the third filter device is connected with the second end of the fourth filter device and the first end of the sixth filter device, the second end of the fifth filter device is connected with the first end of the seventh filter device, the second end of the sixth filter device is connected with the second end of the seventh filter device, the input end of the first filter circuit comprises the first end and the second end of the first filter device, and the output end of the first filter circuit comprises the first end and the second end of the seventh filter device;
alternatively, the first filter circuit includes: an eighth filter, a ninth filter, a tenth filter and an eleventh filter;
the first end of the eighth filter device is connected with the output end of the antenna circuit, the second end of the eighth filter device is connected with the first end of the ninth filter device and the first end of the tenth filter device, the second end of the ninth filter device is connected with the first end of the eleventh filter device, the second end of the tenth filter device is connected with the second end of the eleventh filter device, the input end of the first filter circuit comprises the first end of the eighth filter device and the second end of the tenth filter device, and the output end of the first filter circuit comprises the first end and the second end of the eleventh filter device;
alternatively, the first filter circuit includes: a twelfth filter device, a thirteenth filter device, a fourteenth filter device, a fifteenth filter device, a sixteenth filter device, and a seventeenth filter device;
a first end of the twelfth filter device is connected with an output end of the antenna path, a second end of the twelfth filter device is connected with a first end of the thirteenth filter device and a first end of the fourteenth filter device, a second end of the thirteenth filter device is connected with a first end of the fifteenth filter device and a first end of the sixteenth filter device, and a second end of the fourteenth filter device is connected with a second end of the sixteenth filter device and a second end of the seventeenth filter device; a second end of the fifteenth filter device is connected with a first end of the seventeenth filter device, an input end of the first filter circuit comprises a first end of the twelfth filter device and a second end of the fourteenth filter device, and an output end of the first filter circuit comprises a first end and a second end of the seventeenth filter device;
the filter device is a surface acoustic wave filter device;
the improved low-noise amplification circuit comprises a first amplification circuit and a first matching degree promotion circuit, wherein a first end of the first matching degree promotion circuit is connected with the first amplification circuit, a second end of the first matching degree promotion circuit is grounded, and the first amplification circuit comprises a first power supply of the first amplification circuit, a second power supply of the first amplification circuit, a third power supply, a first inductor, a second inductor, a third inductor, a first field effect transistor, a second field effect transistor and a first capacitor;
the output end of a first power supply of the first amplifying circuit is connected with the first end of the first inductor, the second end of the first inductor is connected with the grid electrode of the first field effect transistor, the source electrode of the first field effect transistor is connected with the first end of the second inductor, the second end of the second inductor is grounded, the output end of a second power supply of the first amplifying circuit is connected with the input end of the first matching degree improving circuit and the grid electrode of the second field effect transistor, the output end of the first matching degree improving circuit is grounded, the source electrode of the second field effect transistor is connected with the drain electrode of the first field effect transistor, the drain electrode of the second field effect transistor is connected with the first end of the first capacitor and the first end of the third inductor, the second end of the third inductor is connected with the output end of the third power supply, and the input port of the improved low-noise amplifying circuit is the first end of the first inductor, the output end of the improved low-noise amplifying circuit is the second end of the first capacitor;
or the improved low-noise amplifying circuit comprises a second amplifying circuit and a second matching degree improving circuit, wherein the second amplifying circuit is connected with the second matching degree improving circuit, and the second amplifying circuit comprises a fourth power supply, a fifth power supply, a sixth power supply, a fourth inductor, a fifth inductor, a sixth inductor, a third field effect transistor, a fourth field effect transistor and a third capacitor; the output end of the fourth power supply is connected with the first end of the fourth inductor, the second end of the fourth inductor is connected with the grid electrode of the third field effect transistor and the first end of the second matching degree improving circuit, the second end of the second matching degree improving circuit is connected with the first end of the fifth inductor and the source electrode of the third field effect transistor, the second end of the fifth inductor is grounded, the drain electrode of the third field effect transistor is connected with the source electrode of the fourth field effect transistor, the grid electrode of the fourth field effect transistor is connected with the output end of the fifth power supply, the drain electrode of the fourth field effect transistor is connected with the first end of the sixth inductor and the first end of the third capacitor, the second end of the sixth inductor is connected with the output end of the sixth power supply, and the input port of the improved low-noise amplifying circuit is the first end of the fourth inductor, the output end of the improved low-noise amplifying circuit is the second end of the third capacitor;
the improved frequency mixing circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a fourth capacitor, a fifth capacitor, a second resistor, a third resistor, a seventh inductor, an eighth inductor, a first power supply of the improved frequency mixing circuit and a second power supply of the improved frequency mixing circuit;
a source of the first transistor is connected to a source of the second transistor and ground, a drain of the first transistor is connected to a first terminal of the seventh inductor, a source of the third transistor is connected to a source of the fourth transistor, a second terminal of the seventh inductor is connected to a first terminal of the fourth capacitor and a first power supply of the modified mixer circuit, a second terminal of the fourth capacitor is grounded, a drain of the third transistor is connected to the second resistor, a gate of the fourth transistor is connected to a gate of the fifth transistor, a drain of the second transistor is connected to a first terminal of the eighth inductor, a source of the fifth transistor and a source of the sixth transistor, a second terminal of the eighth inductor is connected to a second power supply of the modified mixer circuit and a first terminal of the fifth capacitor, and a second terminal of the fifth capacitor is grounded, the drain electrode of the sixth transistor is connected with the third resistor;
the input end of the improved mixing circuit is the grid electrode of the first transistor and the grid electrode of the second transistor, and the output end of the improved mixing circuit is the drain electrode of the fourth transistor and the drain electrode of the fifth transistor.
2. The internet of things radio frequency signal receiving circuit of claim 1, wherein the first matching degree improving circuit comprises a first resistor and a second capacitor, the first resistor is connected in series with the second capacitor, an input end of the first matching degree improving circuit is a first end of the first resistor, an output end of the first matching degree improving circuit is a second end of the second capacitor, and a second end of the first resistor is connected with a first end of the second capacitor.
3. A chip, wherein the chip comprises a processor, a power circuit and the internet of things radio frequency signal receiving circuit of claim 1 or 2.
4. A circuit board comprising a modem, a signal processor and the chip of claim 3.
5. A terminal, characterized in that it comprises a housing and a circuit board according to claim 4.
CN201810099443.9A 2018-01-31 2018-01-31 Multipurpose high signal-to-noise ratio type Internet of things radio frequency circuit, circuit board, chip and terminal Active CN108418594B (en)

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