CN113517869A - Low-noise amplifier, signal receiving and transmitting equipment and signal receiving and transmitting method - Google Patents
Low-noise amplifier, signal receiving and transmitting equipment and signal receiving and transmitting method Download PDFInfo
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- CN113517869A CN113517869A CN202110701164.7A CN202110701164A CN113517869A CN 113517869 A CN113517869 A CN 113517869A CN 202110701164 A CN202110701164 A CN 202110701164A CN 113517869 A CN113517869 A CN 113517869A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
Abstract
The invention discloses a low-noise amplifier, signal transceiving equipment and a signal transceiving method, relates to the technical field of communication, and aims to reduce the cost of a bill of materials, a printed circuit board and a chip while optimizing the linearity of an output signal of a power amplifier. The low noise amplifier includes: the input matching circuit is provided with an inductance filtering sub-circuit and a switch circuit. When the signal receiving and transmitting equipment is in a signal receiving state, the switch circuit is used for transmitting a received signal to the signal amplifying circuit; when the signal transceiver is in a signal transmitting state, the switch circuit transmits a nonlinear signal contained in the transmitting signal to the ground terminal. The signal transceiver comprises the low noise amplifier provided by the technical scheme. The low noise amplifier, the signal receiving and transmitting equipment and the signal receiving and transmitting method provided by the invention are applied to the communication technology.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a low noise amplifier, a signal transceiver, and a signal transceiving method.
Background
At present, a Power Amplifier (PA) and a radio frequency switch are integrated on a chip of a radio frequency transceiver, which can improve the integration level of the chip and optimize a Bill of Materials (BOM) scheme. High power PAs are difficult to design based on CMOS processes due to the transconductance and heat dissipation characteristics of Semiconductor devices fabricated in Complementary Metal Oxide Semiconductor (CMOS) processes. Moreover, since the PA output signal has a large amplitude, the nonlinear model of the CMOS process is inaccurate, and various nonlinear parasitic effects affect the large signal, the nonlinear characteristic of the PA output signal must be suppressed by adding an additional filter circuit.
In the prior art, a filter Circuit can be added on a Printed Circuit Board (PCB) to suppress the non-linear characteristic of the PA output signal. This solution results in higher PCB, BOM and chip costs. Therefore, how to reduce the cost of BOM, PCB and chip while optimizing the linearity of the output signal of PA becomes the technical problem to be solved.
Disclosure of Invention
The invention aims to provide a low noise amplifier, a signal transceiving device and a signal transceiving method, which are used for reducing the cost of BOM, PCB and chip while optimizing the linearity of the output signal of PA.
In order to achieve the above object, the present invention provides a low noise amplifier for a signal transceiving apparatus, the low noise amplifier comprising: the input matching circuit, the output matching circuit and the signal amplifying circuit are respectively and electrically connected with the input matching circuit and the output matching circuit; the input matching circuit is provided with an inductance filtering sub-circuit and a switch circuit; the inductance filtering sub-circuit is coupled with the input end of the signal amplifying circuit through the switch circuit, and the inductance filtering sub-circuit is grounded through the switch circuit.
When the signal transceiver is in a signal receiving state, the switch circuit is used for transmitting a received signal to the signal amplifying circuit;
when the signal transceiver is in a signal transmitting state, the switch circuit is used for transmitting a nonlinear signal contained in a transmitting signal to the ground terminal.
Optionally, the inductive filter sub-circuit includes a first inductor and a first capacitor; the first inductor is coupled with the input end of the signal amplifying circuit through the switch circuit, and the first inductor and the first capacitor are grounded through the switch circuit.
Optionally, the first capacitor is a variable capacitor.
Optionally, the inductive filter sub-circuit further includes a second capacitor, a first electrode of the second capacitor is coupled to the first end of the first inductor, and a second electrode of the second capacitor is coupled to the second end of the first inductor.
Optionally, the second capacitor is a variable capacitor.
Optionally, the inductive filter sub-circuit further includes a short-circuit switch, the first inductor has a tap end, and the tap end of the first inductor is connected to the end of the first inductor through the short-circuit switch.
When the signal transceiver is in a signal receiving state, the short-circuit switch is in a disconnected state;
when the signal transceiver is in a signal transmitting state, the short-circuit switch is in a closed state.
Optionally, when the short-circuit switch is in a closed state, the inductance value of the first inductor, the capacitance value of the first capacitor, and the filtering frequency of the inductor filtering sub-circuit satisfy an LC resonance frequency formula; the end part of the first inductor is a signal input end of the low noise amplifier; or, the end of the first inductor is coupled with the first capacitor.
Optionally, the switching circuit at least includes a first switch and a second switch; the first end of the first switch is coupled with the first capacitor, and the second end of the first switch is grounded; the first end of the second switch is coupled with the second end of the first inductor, and the second end of the second switch is coupled with the input end of the signal amplifying circuit.
Compared with the prior art, in the low-noise amplifier provided by the invention, the first end of the inductance filter sub-circuit is coupled with the antenna, and the second end of the inductance filter sub-circuit is grounded through the switch circuit. Therefore, when the signal equipment is in a transmitting state, the inductive filtering sub-circuit can receive the nonlinear signal contained in the output signal of the power amplifier through the antenna, and the switch circuit transmits the received nonlinear signal to the ground terminal, so that the linearity optimization of the output signal of the power amplifier is realized. Moreover, the low-noise amplifier provided by the invention comprises the inductance filter sub-circuit, the linearity optimization of the output signal of the power amplifier can be realized without adding an additional filter circuit on a printed circuit board or a chip, and the BOM, PCB and chip cost is reduced.
The invention also provides a signal transceiving device comprising any one of the low noise amplifiers provided as above.
Compared with the prior art, the beneficial effects of the signal transceiver provided by the invention are the same as those of the low noise amplifier provided by the invention, and are not repeated herein.
The present invention further provides a signal transceiving method of a signal transceiving device, which is applied to the signal transceiving device, the signal transceiving device includes a low noise amplifier, a power amplifier and an antenna, and the signal transceiving method of the signal transceiving device includes:
when the signal receiving and transmitting equipment is in a signal receiving state, the inductive filtering sub-circuit filters signals received by the antenna, and the switch circuit transmits the received signals filtered by the inductive filtering sub-circuit to the signal amplifying circuit;
when the signal transceiver is in a signal transmitting state, the inductive filtering sub-circuit filters a transmitting signal, the switch circuit transmits the filtered nonlinear signal to the grounding end, so that the inductive filtering sub-circuit filters the signal transmitted by the power amplifier, and the antenna is used for transmitting the filtered signal.
Compared with the prior art, the beneficial effects of the signal transceiving method provided by the invention are the same as those of the low noise amplifier provided by the invention, and are not repeated herein.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a diagram of a prior art CMOS RF transceiver;
FIG. 2 is a first schematic diagram of a low noise amplifier circuit according to an embodiment of the present invention;
FIG. 3 is a second schematic diagram of a low noise amplifier circuit according to an embodiment of the present invention;
FIG. 4 is a third schematic diagram of a low noise amplifier circuit according to an embodiment of the present invention;
FIG. 5 is a fourth schematic diagram of a low noise amplifier circuit according to an embodiment of the present invention;
fig. 6 is a first flowchart of a signal transceiving method of a signal transceiving apparatus according to an embodiment of the present invention;
fig. 7 is a flowchart of a signal transceiving method of a signal transceiving apparatus according to an embodiment of the present invention.
Reference numerals:
1-signal receiving path, 2-signal transmitting path;
3-digital signal processor, 10-signal receiving switch;
11-low noise amplifier, 12-first mixer;
13-a first radio frequency signal phase-locked loop, 14-a trans-impedance amplifier;
15-a first direct current offset calibration module, 16-a first intermediate frequency low-pass filter;
17-a first baseband signal phase locked loop, 18-an analog-to-digital converter;
20-a signal transmitting switch, 21-a power amplifier;
22-gain amplifier, 23-second mixer;
24-a second radio frequency signal phase-locked loop, 25-a second direct current offset calibration module;
26-a second intermediate frequency low pass filter, 27-a second baseband signal phase locked loop;
28-digital-to-analog converter, 110-input matching circuit;
111-signal amplification circuit, 112-output matching circuit;
113-output port, 1100-matching capacitance;
1101-an inductive filter sub-circuit, 1101 a-a first inductance;
1101a 1-inactive inductor segment, 1101a 2-active inductor segment;
1101 b-a first capacitance, 1101 c-a second capacitance;
1101 d-short circuit switch, 1102-switching circuit;
1102 a-first switch, 1102 b-second switch.
Detailed Description
In order to facilitate clear description of technical solutions of the embodiments of the present invention, in the embodiments of the present invention, terms such as "first" and "second" are used to distinguish the same items or similar items having substantially the same functions and actions. For example, the first threshold and the second threshold are only used for distinguishing different thresholds, and the sequence order of the thresholds is not limited. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.
It is to be understood that the terms "exemplary" or "such as" are used herein to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
In the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a and b combination, a and c combination, b and c combination, or a, b and c combination, wherein a, b and c can be single or multiple.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 illustrates a prior art architecture diagram of a CMOS rf transceiver. As shown in fig. 1, the conventional CMOS rf transceiver includes: an antenna, a signal receiving path 1, a signal transmitting path 2, and a digital signal processor 3 for processing signals. Wherein, the first end of the signal receiving path 1 is coupled with the antenna, and the second end of the signal receiving path 1 is coupled with the digital signal processor 3; a first end of the signal transmission path 2 is coupled to the antenna and a second end of the signal transmission path 2 is coupled to the digital signal processor 3.
As shown in fig. 1, the signal receiving path 1 includes: the radio frequency signal receiving circuit comprises a signal receiving switch 10, a low noise amplifier 11, a first mixer 12, a first radio frequency signal phase-locked loop 13, a transimpedance amplifier 14, a first loss alignment module 15, a first intermediate frequency low-pass filter 16, a first baseband signal phase-locked loop 17 and an analog-to-digital converter 18. Wherein, a first terminal of the signal receiving switch 10 is coupled to the antenna, a second terminal of the signal receiving switch 10 is coupled to an input terminal of the low noise amplifier 11, and an output terminal of the low noise amplifier 11 is coupled to an input terminal of the first mixer 12; an input end of the first mixer 12 is coupled to an output end of the first radio frequency signal phase-locked loop 13, and an output end of the first mixer 12 is coupled to an input end of the transimpedance amplifier 14; the output terminal of the transimpedance amplifier 14 is coupled to the input terminal of the first loss alignment module 15; the output terminal of the first constant loss alignment module 15 is coupled to the input terminal of the first intermediate frequency low pass filter 16; an output of the first intermediate frequency low pass filter 16 is coupled to an input of an analog-to-digital converter 18; an input of the analog-to-digital converter 18 is coupled to an output of the first baseband signal phase locked loop 17, and an output of the analog-to-digital converter 18 is coupled to the digital signal processor 3.
As shown in fig. 1, the signal transmission path 2 includes: the signal transmitting switch 20, the power amplifier 21, the gain amplifier 22, the second mixer 23, the second radio frequency signal phase-locked loop 24, the second dc offset calibration module 25, the second intermediate frequency low-pass filter 26, the second baseband signal phase-locked loop 27, and the digital-to-analog converter 28. Wherein, a first terminal of the signal transmitting switch 20 is coupled to the antenna, and a second terminal of the signal transmitting switch 20 is coupled to an output terminal of the power amplifier 21; an input of the power amplifier 21 is coupled to an output of the gain amplifier 22; an input of the gain amplifier 22 is coupled to an output of the second mixer 23; the input end of the second mixer 23 is coupled to the output end of the second rf signal phase-locked loop 24, and the input end of the second mixer 23 is coupled to the output end of the second dc offset calibration module 25; an input terminal of the second dc offset calibration module 25 is coupled to an output terminal of the second intermediate frequency low pass filter 26; an input of the second intermediate frequency low pass filter 26 is coupled to an output of the digital-to-analog converter 28; an input of the digital-to-analog converter 28 is coupled to an output of the second baseband signal phase locked loop 27, and an input of the digital-to-analog converter 28 is coupled to the digital signal processor 3.
When the radio frequency transceiver is in the signal receiving state, the signal receiving switch 10 is closed, and the signal transmitting switch 20 is opened. The receiving signal received by the antenna is firstly transmitted to the low noise amplifier 11, the receiving signal after low noise amplification by the low noise amplifier enters the first mixer 12, the first mixer 12 moves the received radio frequency signal to the intermediate frequency, the first radio frequency signal phase-locked loop 13 is used for adjusting the receiving signal after mixing by the first mixer 12, the receiving signal is amplified by the transimpedance amplifier 14 and the voltage is calibrated by the first direct current offset calibration module 15, then the receiving signal is transmitted to the first intermediate frequency low-pass filter 16, the signal higher than the intermediate frequency is forbidden to pass, the receiving signal processed by the first intermediate frequency low-pass filter 16 enters the analog-to-digital converter 18, the receiving signal is converted into the digital signal from the analog signal, the first baseband signal phase-locked loop 17 is used for adjusting the digital signal processed by the analog-to-digital converter 18, the receiving signal finally enters the digital signal processor 3, the digital signal processor 3 processes the received digital signal.
When the radio frequency transceiver is in the signal transmitting state, the signal receiving switch 10 is opened, and the signal transmitting switch 20 is closed. The digital processor 3 transmits the sent digital signal to the digital-to-analog converter 28, the second baseband signal phase-locked loop 27 adjusts the digital signal entering the digital-to-analog converter 28, the digital-to-analog converter 28 converts the transmission signal from a digital signal to an analog signal, the transmission signal passes through the second intermediate frequency low-pass filter 26, the signal higher than the intermediate frequency is prohibited from passing through, the transmission signal processed by the second intermediate frequency low-pass filter 26 is transmitted to the second mixer 23 after being voltage-calibrated by the second dc offset calibration module 25, the second mixer 23 moves the intermediate frequency signal to the radio frequency, the second radio frequency signal phase-locked loop 24 is used for adjusting the transmission signal after being mixed by the second mixer 23, and finally the transmission signal is transmitted to the antenna after being amplified by the gain amplifier 22 and the power amplifier 21, and the signal to be transmitted is emitted by the antenna.
In the prior art, when a transmission signal transmitted through the signal transmission path 2 is output through the power amplifier 21, since the amplitude of the output signal is large, a nonlinear model based on a CMOS process device is inaccurate, and various nonlinear parasitic effects may exist under the large signal, it is necessary to suppress the nonlinear characteristic of the transmission signal by adding an additional filter circuit. One scheme is as follows: the purpose is achieved by adding a filter circuit on the PCB, an additional BOM device is required to be added in the scheme, meanwhile, the nonlinear characteristic of the power amplifier 21 is greatly influenced by the parasitic effect of the PCB, and the problem of batch failure may occur in the mass production process; the other scheme is as follows: the filter circuit is realized by adding an inductor and a capacitor on a chip, and the cost of the chip is increased due to the large area of the inductor on the chip. Based on this, the technical scheme provided by the invention can solve the problem of reducing the cost of materials, printed circuit boards and chips while optimizing the linearity of the output signal of the power amplifier 21.
In view of the above problem, an embodiment of the present invention provides a low noise amplifier, which is used for a signal transceiver. The type of signal that can be transceived may be a radio frequency signal, or other types of signals, which are not limited in this respect.
Fig. 2 illustrates a first circuit schematic diagram of the low noise amplifier according to the embodiment of the present invention. As shown in fig. 2, the low noise amplifier according to the embodiment of the present invention includes an input matching circuit 110, an output matching circuit 112, and a signal amplifying circuit 111 electrically connected to the input matching circuit 110 and the output matching circuit 112, respectively; the input matching circuit 110 has an inductive filtering sub-circuit 1101 and a switching circuit 1102. The inductive filtering sub-circuit 1101 is coupled to the input of the signal amplification circuit 111 via a switching circuit 1102, and the inductive filtering sub-circuit 1101 is coupled to ground via the switching circuit 1102.
When the low noise amplifier is applied to a signal transceiving apparatus, the antenna of the signal transceiving apparatus is coupled to the inductive filtering sub-circuit 1101. At this time, whether the received signal is received by the antenna or the transmitted signal is required to be transmitted, it can be sensed by the inductive filtering sub-circuit 1101. Based on this, when the signal transceiver is in the signal receiving state, the switch circuit 1102 is configured to transmit the received signal to the signal amplifying circuit 111; when the signal transceiver is in the signal transmitting state, the switch circuit 1102 is configured to transmit the nonlinear signal included in the transmitting signal to the ground.
In practical applications, the input matching circuit 110 further has a matching capacitor 1100. The matching capacitor 1100 is electrically connected to the switching circuit 1102 through an inductive filtering sub-circuit 1101. When the signal transceiver is in a signal receiving state, a received signal received by the antenna is transmitted to the inductive filter sub-circuit 1101 through the matching capacitor 1100, the received signal is transmitted to the signal amplification circuit 111 through the switch circuit 1102, the signal amplification circuit 111 is configured to amplify the received signal, the amplified received signal is transmitted to the output matching circuit 112 for output matching, and finally, the received signal subjected to output matching is transmitted to other devices of the signal receiving path 1 through the output port 113 of the low noise amplifier 11.
When the signal transceiver is in a signal transmitting state, the input matching circuit 110 receives a nonlinear signal contained in a signal to be transmitted through the antenna, the nonlinear signal is transmitted to the inductive filter sub-circuit 1101 through the matching capacitor 1100, and the nonlinear signal contained in the received transmitting signal is transmitted to the ground terminal through the switch circuit 1102.
As can be seen from the structure and the specific implementation process of the low noise amplifier provided in the embodiment of the present invention, in the low noise amplifier 11 provided in the embodiment of the present invention, a first end of an internal inductive filtering sub-circuit 1101 is coupled to an antenna, a second end of the inductive filtering sub-circuit 1101 is grounded through a switch circuit 1102, and a second end of the inductive filtering sub-circuit 1101 is connected to the signal amplifying circuit 111 through the switch circuit 1102. Based on this, when the signal device is in a transmitting state, the inductive filtering sub-circuit 1101 may receive a non-linear signal included in an output signal of the power amplifier 21 through the antenna, and the switch circuit 1102 transmits the signal output by the inductive filtering sub-circuit 1101 to the ground, so that linearity optimization of the output signal of the power amplifier 21 is achieved. Moreover, the low noise amplifier 11 provided by the present invention includes the inductive filtering sub-circuit 1101, and the linearity optimization of the PA output signal can be realized without adding an additional filtering circuit on a printed circuit board or a chip, thereby reducing the cost of the BOM, the PCB and the chip.
In an alternative, as shown in fig. 2, the inductive filtering subcircuit 1101 includes a first inductor 1101a and a first capacitor 1101 b. The first inductor 1101a is coupled to the input terminal of the signal amplifying circuit 111 through the switch circuit 1102, and the first inductor 1101a and the first capacitor 1101b are grounded through the switch circuit 1102.
When the low noise amplifier is applied to a signal transceiving apparatus, the antenna of the signal transceiving apparatus is coupled to the inductive filtering sub-circuit 1101. When the signal transceiver is in a signal receiving state, at this time, the output end of the power amplifier 21 is in a high impedance state, the received signal received by the antenna is transmitted to the inductive filter sub-circuit 1101, the received signal is transmitted to the signal amplification circuit 111 through the switch circuit 1102, the signal amplification circuit 111 is used for amplifying the received signal, the amplified received signal is transmitted to the output matching circuit 112 for output matching, and finally, the received signal after output matching is transmitted to other devices of the signal receiving path 1 from the output port 113 of the low noise amplifier 11.
When the signal transceiver is in the signal transmitting state, the signal output from the power amplifier 21 is transmitted to the antenna, which is not a wireThe linear signal is transmitted to the low noise amplifier 11 through the input matching circuit 110 coupled to the antenna, the nonlinear signal transmitted by the power amplifier 21 is filtered by the inductive filtering sub-circuit 1101, and the switch circuit 1102 transmits the filtered nonlinear signal to the ground. At this time, the operating frequency of the inductive filter sub-circuit 1101 satisfies the resonant frequency formula
Wherein, in the step (A),
to determine the frequency of the nonlinear signal contained in the transmitted signal, L1 is the inductance of the first inductor 1101a, and C1 is the capacitance of the first capacitor 1101 b. Therefore, the signal received by the antenna is the transmission signal passing through the linearly optimized power amplifier 21.
The first capacitor 1101b may be a variable capacitor, i.e., a capacitor whose capacitance can be adjusted within a certain range. The variable capacitor is characterized in that the capacitance can be changed, and is mainly used for changing and adjusting the resonant frequency of the loop. In the embodiment of the present invention, the capacitance value C1 of the first capacitor 1101b may be adjusted to change the resonant frequency of the inductive filter sub-circuit, so as to filter the nonlinear signals with different frequencies.
Fig. 3 shows a second schematic diagram of a low noise amplifier circuit according to an embodiment of the present invention. Referring to fig. 3, the inductive filter subcircuit 1101 may further include a second capacitor 1101 c. A first electrode of the second capacitor 1101c is coupled to a first terminal of the first inductor 1101a, and a second electrode of the second capacitor 1101c is coupled to a second terminal of the first inductor 1101 a. At this time, the operating frequency of the inductive filter sub-circuit 1101 satisfies the resonant frequency formula
Wherein, in the step (A),
for the frequency of the nonlinear signal contained in the transmitting signal, L1 is the inductance of the first inductor 1101a, C1 is the capacitance of the first capacitor 1101b, and C2 is the second capacitanceCapacitance value of the capacitor 1101 c. Therefore, when the inductive filtering sub-circuit 1101 includes the second capacitor 1101c, the second capacitor 1101c may be used to increase the operating frequency of the inductive filtering sub-circuit 1101, which is beneficial to filtering out the lower frequency nonlinear signal contained in the transmission signal.
The second capacitor 1101c may be a variable capacitor. In the embodiment of the present invention, since the first capacitor 1101b and the second capacitor 1101C may be variable capacitors, the resonant frequency of the inductive filter sub-circuit may be changed by adjusting the capacitance value C1 of the first capacitor 1101b and the capacitance value C2 of the second capacitor 1101C, so as to filter out nonlinear signals with different frequencies. Based on this, the number of the adjustable capacitors is increased, and the capacitance value of the corresponding equivalent capacitor in the inductive filter sub-circuit is also increased, so that the adjustable range of the resonant frequency of the inductive filter sub-circuit 1101 is relatively large, and the filtered nonlinear signal frequency of the inductive filter sub-circuit 1101 can be adjusted according to actual needs.
Fig. 4 shows a third schematic diagram of a low noise amplifier circuit according to an embodiment of the present invention. Fig. 5 shows a fourth schematic diagram of a low noise amplifier circuit provided by the embodiment of the invention. Referring to fig. 4 and 5, the inductive filtering subcircuit 1101 further includes a shorting switch 1101 d. The first inductor 1101a has a tap, and the tap of the first inductor 1101a is connected to an end of the first inductor 1101a via a short-circuit switch 1101 d.
When the shorting switch 1101d is in a closed state, the inductance value of the first inductor 1101a, the capacitance value of the first capacitor 1101b, and the filtering frequency of the inductive filtering sub-circuit 1101 satisfy the LC resonant frequency formula.
When the signal transceiving equipment is in the signal receiving state, the short-circuit switch 1101d is turned off. The method of receiving signals is the same as the above embodiments, and is not described herein.
When the signal transceiving equipment is in a signal transmitting state, the short-circuit switch 1101d is closed. At this time, the operating frequency of the inductive filter sub-circuit 1101 satisfies the resonant frequency formula
Wherein, in the step (A),
to determine the frequency of the nonlinear signal contained in the transmit signal, L2 is the inductance of the effective inductor segment 1101a2, and C1 is the capacitance of the first capacitor 1101 b. In practical applications, after the first inductor 1101a in the inductive filter sub-circuit 1101 is tapped, the inactive inductor segment 1101a1 and the active inductor segment 1101a2 are formed. Shorting switch 1101d is connected in parallel across non-active inductor segment 1101a 1.
When the end of the first inductor 1101a is a signal input terminal of the low noise amplifier 11, the first terminal of the non-effective inductor 1101a1 can be connected to an antenna signal, the second terminal of the non-effective inductor 1101a1 and the first terminal of the effective inductor 1101a2 are substantially the tap terminal of the first inductor, and the second terminal of the effective inductor 1101a2 is coupled to the first capacitor 1101 b.
When the end of the first inductor 1101a is coupled to the first capacitor 1101b, the first terminal of the active inductor segment 1101a2 can be connected to an antenna signal, the second terminal of the active inductor segment 1101a2 and the first terminal of the inactive inductor segment 1101a1 are substantially the tap terminal of the first inductor, and the second terminal of the inactive inductor segment 1101a1 is coupled to the first capacitor 1101 b. The short-circuit switch 1101d is connected to the inductor filter sub-circuit 1101, and when the short-circuit switch 1101d is closed, the length and the number of turns of the coil of the effective inductor segment 1101a2 connected to the inductor filter sub-circuit 1101 are both smaller than the length and the number of turns of the coil of the first inductor 1101a, so that it can be seen that the inductance value of the effective inductor segment 1101a2 is smaller than the inductance value L1 of the first inductor 1101 a. Based on this, the capacitance value C1 of the first capacitor 1101b can be adjusted to change the resonant frequency of the inductive filter sub-circuit, so as to filter out the higher-frequency nonlinear signal contained in the transmission signal.
In some embodiments, as shown in fig. 2, 3, 4, the switch circuit 1102 includes at least a first switch 1102a, a second switch 1102 b; a first terminal of the first switch 1102a is coupled to the first capacitor 1101b, and a second terminal of the first switch 1102a is grounded; a first terminal of the second switch 1102b is coupled to the second terminal of the first inductor 1101a, and a second terminal of the second switch 1102b is coupled to the input terminal of the signal amplifying circuit 111.
When the signal transceiving equipment is in a signal receiving state, the first switch 1102a is opened, and the second switch 1102b is closed. Since the first switch 1102a connecting the inductance filtering sub-circuit 1101 with the ground terminal is opened, the second switch 1102b connecting the inductance filtering sub-circuit 1101 with the signal amplifying circuit 111 is closed. Therefore, the switch circuit 1102 serves to transmit the reception signal to the signal amplification circuit 111.
When the signal transceiving equipment is in a signal transmitting state, the first switch 1102a is closed, and the second switch 1102b is opened. Since the first switch 1102a of the inductive filtering sub-circuit 1101 connected to the ground terminal is closed, the second switch 1102b of the inductive filtering sub-circuit 1101 coupled to the signal amplifying circuit 111 is opened. Therefore, the switch circuit 1102 serves to transmit the nonlinear signal included in the transmission signal to the ground.
The embodiment of the present invention further provides a signal transceiver device, which includes the low noise amplifier 11 provided in the above embodiment.
Compared with the prior art, the beneficial effects of the signal transceiver provided by the embodiment of the invention are the same as those of the low noise amplifier provided by the above embodiment, and are not described herein again.
In a specific embodiment, as shown in fig. 2, fig. 6 and fig. 7, an embodiment of the present invention further provides a signal transceiving method of a signal transceiving apparatus, which is applied to the signal transceiving apparatus described above, where the signal transceiving apparatus includes a low noise amplifier, a power amplifier and an antenna, the low noise amplifier is the low noise amplifier 11 provided in the foregoing embodiment, and the signal transceiving method of the signal transceiving apparatus includes:
when the signal transceiver is in a receiving state, executing steps S101-S103, specifically comprising:
step S101: the inductive filtering sub-circuit 1101 filters signals received by the antenna;
step S102: the switch circuit 1102 transmits the received signal filtered by the inductance filtering sub-circuit 1101 to the signal amplifying circuit 111;
step S103: the signal amplifying circuit 111 is configured to amplify the received signal, transmit the amplified received signal to the output matching circuit 112 for output matching, and finally transmit the received signal subjected to output matching to other devices of the signal receiving path 1 through the output port 113 of the low noise amplifier 11.
When the signal transceiver is in a signal transmitting state, executing steps S201 to S203, specifically including:
step S201: the inductive filtering sub-circuit 1101 filters the transmission signal;
step S202: the switch circuit 1102 transmits the nonlinear signal filtered by the inductive filter sub-circuit 1101 to the ground terminal;
the operating frequency of the inductive filtering sub-circuit 1101 satisfies the formula of resonant frequency
Wherein, in the step (A),
the frequency of the nonlinear signal, which is the output signal of the power amplifier 21, L is the inductance of the equivalent inductor in the inductive filter sub-circuit 1101, and C is the capacitance of the equivalent capacitor in the inductive filter sub-circuit 1101.
Step S203: the antenna transmits the filtered signal.
Compared with the prior art, the beneficial effects of the signal transceiving method provided by the embodiment of the invention are the same as those of the low noise amplifier provided by the embodiment, and are not described herein again.
While the invention has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
While the invention has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the invention. Accordingly, the specification and figures are merely exemplary of the invention as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A low noise amplifier is used for a signal transceiving device and comprises an input matching circuit, an output matching circuit and a signal amplifying circuit, wherein the signal amplifying circuit is electrically connected with the input matching circuit and the output matching circuit respectively; the input matching circuit is provided with an inductance filtering sub-circuit and a switch circuit; the inductance filtering sub-circuit is coupled with the input end of the signal amplifying circuit through the switch circuit, and the inductance filtering sub-circuit is grounded through the switch circuit;
when the signal transceiver is in a signal receiving state, the switch circuit is used for transmitting a received signal to the signal amplifying circuit;
when the signal transceiver is in a signal transmitting state, the switch circuit is used for transmitting a nonlinear signal contained in a transmitting signal to a ground terminal.
2. The low noise amplifier of claim 1, wherein the inductive filtering sub-circuit comprises a first inductor and a first capacitor, the first inductor being coupled to the input terminal of the signal amplification circuit through the switching circuit, and the first inductor and the first capacitor being grounded through the switching circuit.
3. The low noise amplifier of claim 2, wherein the first capacitance is a variable capacitance.
4. The low noise amplifier of claim 2, wherein the inductor filter sub-circuit further comprises a second capacitor, a first electrode of the second capacitor being coupled to the first terminal of the first inductor, and a second electrode of the second capacitor being coupled to the second terminal of the first inductor.
5. The low noise amplifier of claim 4, wherein the second capacitance is a variable capacitance.
6. The low noise amplifier of claim 2, wherein the inductive filter subcircuit further comprises a shorting switch; the first inductor is provided with a tap end, and the tap end of the first inductor is connected with the end part of the first inductor through the short-circuit switch;
when the signal transceiver is in a signal receiving state, the short-circuit switch is in an off state;
when the signal transceiving equipment is in a signal transmitting state, the short-circuit switch is in a closed state.
7. The LNA of claim 6, where the inductance of the first inductor, the capacitance of the first capacitor and the filter frequency of the inductor filter sub-circuit satisfy the LC resonance frequency equation when the shorting switch is in the closed state; wherein the content of the first and second substances,
the end part of the first inductor is a signal input end of the low noise amplifier; or the like, or, alternatively,
an end of the first inductor is coupled to the first capacitor.
8. The low noise amplifier according to any one of claims 1 to 7, wherein the switching circuit comprises at least a first switch and a second switch; a first end of the first switch is coupled with the first capacitor, and a second end of the first switch is grounded; the first end of the second switch is coupled to the second end of the first inductor, and the second end of the second switch is coupled to the input end of the signal amplifying circuit.
9. A signal transceiver comprising a low noise amplifier according to any one of claims 1 to 8.
10. A signal transceiving method of a signal transceiving apparatus, which is applied to the signal transceiving apparatus according to claim 9, the signal transceiving apparatus comprising a low noise amplifier, a power amplifier, and an antenna, the signal transceiving method of the signal transceiving apparatus comprising:
when the signal transceiver is in a signal receiving state, the inductive filtering sub-circuit filters a signal received by the antenna, and the switch circuit transmits the received signal filtered by the inductive filtering sub-circuit to the signal amplifying circuit;
when the signal transceiver is in a signal transmitting state, the inductive filtering sub-circuit filters a transmitting signal, and the switching circuit transmits the filtered nonlinear signal to a ground terminal, so that the inductive filtering sub-circuit filters a signal sent by the power amplifier, and the antenna is used for sending the filtered signal.
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| CN202110701164.7A CN113517869A (en) | 2021-06-24 | 2021-06-24 | Low-noise amplifier, signal receiving and transmitting equipment and signal receiving and transmitting method |
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