CN116248056A - Low noise amplifier and radio frequency receiver - Google Patents
Low noise amplifier and radio frequency receiver Download PDFInfo
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- CN116248056A CN116248056A CN202211560774.0A CN202211560774A CN116248056A CN 116248056 A CN116248056 A CN 116248056A CN 202211560774 A CN202211560774 A CN 202211560774A CN 116248056 A CN116248056 A CN 116248056A
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- 230000005540 biological transmission Effects 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
- H03F1/565—Modifications of input or output impedances, not otherwise provided for using inductive elements
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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
- H03F3/193—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only with field-effect devices
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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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/294—Indexing scheme relating to amplifiers the amplifier being a low noise amplifier [LNA]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention relates to a low noise amplifier, which comprises an input matching circuit, a single amplifying unit and an output matching circuit. The output matching circuit comprises a first state and a second state; when the output matching circuit is in a first state, a resonance point of gain of the output matching circuit is a first frequency; when the output matching circuit is in the second state, the resonance point of the gain of the output matching circuit is the second frequency, and the first frequency is higher than the second frequency. When the working frequency of the output matching circuit is required to be in a high-frequency range, the output matching circuit is adjusted to a first state, and when the working frequency of the output matching circuit is required to be in a medium-frequency range, the output matching circuit is adjusted to a second state. Therefore, the frequency band of the low-noise amplifier is effectively widened, the low-noise amplifier can meet the output matching requirements of different frequency bands, and the low-noise amplifier is ensured to have the performance of different frequency bands. The invention also relates to a radio frequency receiver.
Description
Technical Field
The present invention relates to the field of radio frequency amplifiers, and in particular, to a low noise amplifier and a radio frequency receiver.
Background
The low noise amplifier acts as the first active module in the receiver system, which plays a vital role in the overall system performance. Firstly, the low noise amplifier receives a weaker signal, if the amplitude of the received signal is similar to the amplitude of the noise signal in the circuit, the output useful signal is affected by the noise signal and even is submerged, so that the low noise amplifier needs to meet two indexes of high gain and low noise coefficient at the same time. Second, the low noise amplifier is used as the next stage of the antenna and the rf filter, and its input impedance must be matched with the characteristic impedance of 50Ω of the rf filter to reduce reflection of the input signal and obtain maximum transmission power. Finally, the linearity of the low noise amplifier also directly affects the dynamic range and sensitivity of the receiver. In addition, broadband communication technology is rapidly advancing, and low noise amplifiers are also required to have a large operating bandwidth.
As shown in fig. 1, the core part of the circuit of the conventional low noise amplifier mainly comprises an input matching capacitor C1, a common source tube M1, a common gate tube M2, an output matching capacitor C2, a source inductance and a drain inductance. However, the low noise amplifier cannot meet the output matching requirements of different frequency bands because no effective means for widening the frequency bands are adopted.
Disclosure of Invention
Based on this, it is necessary to provide a low noise amplifier and a radio frequency receiver capable of adapting to the output matching requirements of different frequency bands, aiming at the problem that the existing low noise amplifier cannot adapt to the output matching requirements of different frequency bands.
A low noise amplifier, comprising:
an input matching circuit;
the amplifying unit is connected with the input matching circuit;
the output matching circuit is connected with the amplifying unit and comprises a first state and a second state;
when the output matching circuit is in the first state, a resonance point of a gain of the output matching circuit is a first frequency;
when the output matching circuit is in the second state, the resonance point of the gain of the output matching circuit is a second frequency;
wherein the first frequency is higher than the second frequency.
By adopting the low-noise amplifier, when the working frequency of the output matching circuit is required to be in a high-frequency range, the output matching circuit is adjusted to be in a first state, and when the working frequency of the output matching circuit is required to be in a medium-frequency range, the output matching circuit is adjusted to be in a second state. Therefore, the frequency band of the low-noise amplifier is effectively widened, the low-noise amplifier can meet the output matching requirements of different frequency bands, and the low-noise amplifier is ensured to have the performance of different frequency bands.
In one embodiment, the output matching circuit includes a first output matching capacitor, a first branch and a second branch, where one end of the first output matching capacitor, one end of the first branch and one end of the second branch are connected to the amplifying unit at the same time, the other end of the first branch is grounded, the other end of the second branch is connected to the other end of the first output matching capacitor, the first branch and the second branch both include a path state and an open state, and the first branch and the second branch are further connected to a register, where the register is used to control the first branch and the second branch to switch between the path state and the open state;
when the first branch and the second branch are both in the channel state, the resonance point of the gain of the output matching circuit is the first frequency;
and when the first branch and the second branch are both in the open circuit state, the resonance point of the gain of the output matching circuit is the second frequency.
In one embodiment, the first branch includes a second output matching capacitor and a first switch, one end of the second output matching capacitor is connected to the amplifying unit, one end of the second branch and one end of the first output matching capacitor at the same time, the other end of the second output matching capacitor is connected to one end of the first switch, the other end of the first switch is connected to the other end of the first output matching capacitor, the first switch is further connected to the register, and the register is used for controlling the first switch to be turned on and off;
when the first switch is closed, the first branch is in the passage state;
when the first switch is opened, the first branch is in the open state.
In one embodiment, the second branch includes a third output matching capacitor and a second switch, one end of the third output matching capacitor is connected to the amplifying unit, one end of the first branch and one end of the first output matching capacitor at the same time, the other end of the third output matching capacitor is connected to the second switch, the other end of the second switch is grounded, the second switch is further connected to the register, and the register is used for controlling the second switch to be turned on and off;
when the second switch is closed, the second branch is in the passage state;
when the second switch is opened, the second branch is in the open state.
In one embodiment, the input matching circuit includes an input matching capacitor and a resistor, the input matching capacitor is connected to the amplifying unit and one end of the resistor at the same time, and the other end of the resistor is connected to a first power supply.
In one embodiment, the amplifying unit includes a first transistor, a second transistor, a first inductor and a second inductor, the input matching circuit is connected to the gate of the first transistor, the source of the first transistor is connected to one end of the first inductor, the drain of the first transistor is connected to the source of the second transistor, the other end of the first inductor is grounded, the gate of the second transistor is connected to a second power supply, the drain of the second transistor is connected to the output matching circuit and one end of the second inductor, and the other end of the second inductor is connected to a third power supply.
In one embodiment, the low noise amplifier includes a plurality of the input matching circuits, and the amplifying unit includes a plurality of the first transistors;
each input matching circuit is connected with the grid electrode of a corresponding first transistor, the drains of a plurality of first transistors are simultaneously connected with one end of the first inductor, and the drains of a plurality of first transistors are simultaneously connected with the source electrode of the second transistor.
A radio frequency receiver comprising the low noise amplifier described above.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art low noise amplifier circuit;
fig. 2 is a schematic circuit diagram of a low noise amplifier according to an embodiment of the invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 2, the low noise amplifier according to an embodiment of the present invention includes an input matching circuit 10, an amplifying unit, and an output matching circuit 20.
The input matching circuit 10 and the output matching circuit 20 are simultaneously connected to the amplifying unit, and the output matching circuit 20 includes a first state and a second state.
When the output matching circuit 20 is in the first state, the resonance point of the gain of the output matching circuit 20 is the first frequency; when the output matching circuit 20 is in the second state, the resonance point of the gain of the output matching circuit 20 is the second frequency, and the first frequency is higher than the second frequency.
In this embodiment, the first frequency is 2.5GHz, and the second frequency is 2GHz. When the resonance point of the gain of the output matching circuit 20 is 2.5GHz, that is, the center frequency of the output matching circuit 20 is 2.5GHz, the operating frequency range is 2.3GHz-2.7GHz, which is a high frequency band, and when the resonance point of the gain of the output matching circuit 20 is 2GHz, that is, the center frequency of the output matching circuit 20 is 2GHz, the operating frequency range is 1.8GHz-2.2GHz, which is a medium frequency band.
By adopting the low noise amplifier, when the working frequency of the output matching circuit 20 is required to be in the high frequency range, the output matching circuit 20 is adjusted to the first state, and when the working frequency of the output matching circuit 20 is required to be in the medium frequency range, the output matching circuit 20 is adjusted to the second state. Therefore, the frequency band of the low-noise amplifier is effectively widened, the low-noise amplifier can meet the output matching requirements of different frequency bands, and the low-noise amplifier is ensured to have the performance of different frequency bands.
It should be explained that, the low noise amplifier in the above embodiment is realized to enter different working frequency ranges, that is, the above-mentioned high frequency band and intermediate frequency band by switching the state of the output matching circuit 20, and by this way, the working range of the wide frequency band (1.8 GHz-2.7 GHz) is realized, so that a suitable working frequency range can be set according to the output requirement, S22 and S21 are not sacrificed, and the performance of different frequency bands can be ensured.
In some embodiments, the input matching circuit 10 includes an input matching capacitor C1 and a resistor R, the input matching capacitor C1 is connected to one end of the amplifying unit and one end of the resistor R, the input matching capacitor C1 is used for isolating an external dc voltage and an internal dc voltage, and the other end of the resistor R is connected to the first power supply Vb1 to provide a dc bias voltage for the amplifying unit through the first power supply Vb 1.
In some embodiments, the amplifying unit includes a first transistor M1, a second transistor M2, a first inductor Ls and a second inductor Ld, the input matching circuit 10 is connected to the gate of the first transistor M1, the source of the first transistor M1 is connected to one end of the first inductor Ls, the drain of the first transistor M1 is connected to the source of the second transistor M2, the other end of the first inductor Ls is grounded GND, the gate of the second transistor M2 is connected to the second power supply Vb2, the drain of the second transistor M2 is connected to the output matching circuit 20 and one end of the second inductor Ld, and the other end of the second inductor Ld is connected to the third power supply VDD.
In practical application, the gate of the first transistor M1 is connected to the input matching capacitor C1 and one end of the resistor R away from the first power supply Vb1, and the first power supply Vb1 is used for providing a dc bias voltage to the first transistor M1.
In some embodiments, the low noise amplifier includes a plurality of input matching circuits 10, the amplifying unit includes a plurality of first transistors M1, each input matching circuit 10 is connected to a gate of a corresponding first transistor M1, sources of the plurality of first transistors M1 are simultaneously connected to the first inductor Ls, and drains of the plurality of first transistors M1 are simultaneously connected to sources of the second transistors M2.
It is understood that the dc bias voltages in the different input matching circuits 10 may be different, and may be adjusted according to the input signal.
It should be noted that, in the embodiment shown in fig. 2, the low noise amplifier includes four input matching circuits 10, the amplifying unit includes four first transistors M1, and sources of the four first transistors M1 are connected to one first inductor Ls, and the first inductor Ls is located at an intermediate position. In this way, for the two-way input on the left, the current direction of the metal wire on the left is opposite to the winding direction of the first inductor Ls, so that the inductance on the left is partially offset, while the current direction of the metal wire on the right is the same as the winding direction of the first inductor Ls, so that the inductance on the right is enhanced to a certain extent. Therefore, this approach may result in the first inductor Ls having a larger difference in source degeneration inductance between the left and right inputs, thereby making the gain performance of the four inputs more different.
Therefore, in other embodiments, the amplifying unit includes at least two first inductors Ls, the plurality of first transistors M1 includes at least two groups, each group includes at least two first transistors M1, and the sources of the at least two first transistors M1 of each group are simultaneously connected to one end of a corresponding one of the first inductors Ls, and the other end of the first inductor Ls is still grounded GND. In this way, the length of the metal line between the sources of the first transistor M1 is effectively shortened, and the influence of the metal line on the first inductance Ls is reduced, so that the inductance value and the gain performance of the multi-path input are smaller in difference.
In some embodiments, the output matching circuit 20 includes a first output matching capacitor C2, a first branch 21, and a second branch 22, where one end of the first output matching capacitor C2, one end of the first branch 21, and one end of the second branch 22 are simultaneously connected to the amplifying unit, specifically, to the drain of the second transistor M2. The other end of the first branch 21 is grounded GND, and the other end of the second branch 22 is connected to the other end of the first output matching capacitor C2, i.e. the second branch 22 is connected in parallel to the first output matching capacitor C2.
The first branch 21 and the second branch 22 each comprise a path state and an open state, and the first branch 21 and the second branch 22 are also each connected to a register for controlling the first branch 21 and the second branch 22 to switch between the path state and the open state.
When the first branch 21 and the second branch 22 are both in the path state, the resonance point of the gain of the output matching circuit 20 is the first frequency; when both the first branch 21 and the second branch 22 are in an open state, the resonance point of the gain of the output matching circuit 20 is the second frequency.
In some embodiments, the first branch 21 includes a second output matching capacitor C3 and a first switch SW1, one end of the second output matching capacitor C3 is connected to the drain of the second transistor M2, one end of the second branch 22 and one end of the first output matching capacitor C2 at the same time, the other end of the second output matching capacitor C3 is connected to one end of the first switch SW1, the other end of the first switch SW1 is connected to the other end of the first output matching capacitor C2, and the first switch SW1 is further connected to a register for controlling the first switch SW1 to be turned on and off.
When the first switch SW1 is closed, the first branch 21 is in the path state; when the first switch SW1 is turned off, the first branch 21 is in an open state.
Further, the second branch 22 includes a third output matching capacitor C4 and a second switch SW2, one end of the third output matching capacitor C4 is connected to the drain of the second transistor M2, one end of the first branch 21 and one end of the first output matching capacitor C2 at the same time, the other end of the third output matching capacitor C4 is connected to the second switch SW2, the other end of the second switch SW2 is grounded, the second switch SW2 is further connected to a register, and the register is used for controlling the second switch SW2 to be turned on or off.
When the second switch SW2 is closed, the second branch 22 is in the path state; when the second switch SW2 is turned off, the second branch 22 is in an open state.
It should be noted that the output matching circuit 20 may be equivalently an LC parallel resonant network, and its resonant frequency is inversely proportional to vlc, so the larger the capacitance, the lower the resonant frequency.
When the first switch SW1 and the second switch SW2 are turned off, the capacitor is an independent first output matching capacitor C2, at this time, a suitable capacitor is selected to enable the resonant frequency to be 2.5GHz, and after the first switch SW1 and the second switch SW2 are turned on, the second output matching capacitor C3 and the third output matching capacitor C4 are added into the circuit, which can result in the increase of ∈lc, so that the resonant frequency can be reduced, and a suitable capacitor is selected to enable the resonant frequency to be reduced to 2GHz. It will thus be appreciated that the first frequency and the second frequency may be tuned by selecting appropriate capacitances, without limitation.
Specifically to the embodiment shown in fig. 2, the addition of the second output matching capacitor C3 may reduce the resonant frequency, while the addition of the third output matching capacitor C4 may reduce the Q value, thereby increasing the flatness.
The invention also relates to a radio frequency receiver comprising a low noise amplifier as in the above embodiments.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. A low noise amplifier, comprising:
an input matching circuit;
the amplifying unit is connected with the input matching circuit;
the output matching circuit is connected with the amplifying unit and comprises a first state and a second state;
when the output matching circuit is in the first state, a resonance point of a gain of the output matching circuit is a first frequency;
when the output matching circuit is in the second state, the resonance point of the gain of the output matching circuit is a second frequency;
wherein the first frequency is higher than the second frequency.
2. The low noise amplifier according to claim 1, wherein the output matching circuit includes a first output matching capacitor, a first branch, and a second branch, one end of the first output matching capacitor, one end of the first branch, and one end of the second branch are simultaneously connected to the amplifying unit, the other end of the first branch is grounded, the other end of the second branch is connected to the other end of the first output matching capacitor, the first branch and the second branch each include a path state and an open state, and the first branch and the second branch are further connected to a register for controlling the first branch and the second branch to switch between the path state and the open state;
when the first branch and the second branch are both in the channel state, the resonance point of the gain of the output matching circuit is the first frequency;
and when the first branch and the second branch are both in the open circuit state, the resonance point of the gain of the output matching circuit is the second frequency.
3. The low noise amplifier of claim 2, wherein the first branch comprises a second output matching capacitor and a first switch, one end of the second output matching capacitor is simultaneously connected to the amplifying unit, one end of the second branch and one end of the first output matching capacitor, the other end of the second output matching capacitor is connected to one end of the first switch, the other end of the first switch is connected to the other end of the first output matching capacitor, the first switch is further connected to the register, and the register is used for controlling the first switch to be closed and opened;
when the first switch is closed, the first branch is in the passage state;
when the first switch is opened, the first branch is in the open state.
4. The low noise amplifier according to claim 2, wherein the second branch circuit comprises a third output matching capacitor and a second switch, one end of the third output matching capacitor is simultaneously connected with the amplifying unit, one end of the first branch circuit and one end of the first output matching capacitor, the other end of the third output matching capacitor is connected with the second switch, the other end of the second switch is grounded, the second switch is further connected with the register, and the register is used for controlling the second switch to be closed and opened;
when the second switch is closed, the second branch is in the passage state;
when the second switch is opened, the second branch is in the open state.
5. The low noise amplifier of claim 1, wherein the input matching circuit comprises an input matching capacitor and a resistor, the input matching capacitor is connected to one end of the amplifying unit and the resistor at the same time, and the other end of the resistor is connected to a first power supply.
6. The low noise amplifier according to claim 1, wherein the amplifying unit includes a first transistor, a second transistor, a first inductor, and a second inductor, the input matching circuit is connected to a gate of the first transistor, a source of the first transistor is connected to one end of the first inductor, a drain of the first transistor is connected to a source of the second transistor, the other end of the first inductor is grounded, a gate of the second transistor is connected to a second power supply, a drain of the second transistor is connected to one end of the output matching circuit and the second inductor, and the other end of the second inductor is connected to a third power supply.
7. The low noise amplifier according to claim 6, wherein the low noise amplifier includes a plurality of the input matching circuits, and the amplifying unit includes a plurality of the first transistors;
each input matching circuit is connected with the grid electrode of a corresponding first transistor, the drains of a plurality of first transistors are simultaneously connected with one end of the first inductor, and the drains of a plurality of first transistors are simultaneously connected with the source electrode of the second transistor.
8. A radio frequency receiver comprising the low noise amplifier of any of claims 1-7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211560774.0A CN116248056A (en) | 2022-12-07 | 2022-12-07 | Low noise amplifier and radio frequency receiver |
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| CN202211560774.0A CN116248056A (en) | 2022-12-07 | 2022-12-07 | Low noise amplifier and radio frequency receiver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117134720A (en) * | 2023-10-25 | 2023-11-28 | 广东工业大学 | Dual-frequency power amplifier with reconfigurable output matching network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117134720A (en) * | 2023-10-25 | 2023-11-28 | 广东工业大学 | Dual-frequency power amplifier with reconfigurable output matching network |
| CN117134720B (en) * | 2023-10-25 | 2024-01-16 | 广东工业大学 | Dual-frequency power amplifier with reconfigurable output matching network |
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