CN112491367B

CN112491367B - Low-noise amplifying circuit, control method thereof and electronic equipment

Info

Publication number: CN112491367B
Application number: CN202011440557.9A
Authority: CN
Inventors: 肖庭峰
Original assignee: Fuman Microelectronics Group Co ltd
Current assignee: Fuman Microelectronics Group Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2024-06-07
Anticipated expiration: 2040-12-10
Also published as: CN112491367A

Abstract

The invention provides a low-noise amplifying circuit, a control method thereof and electronic equipment, wherein the low-noise amplifying circuit comprises: the band-stop filter comprises a first filtering module, a second filtering module and a main inductor; the first end of the main inductor is directly or indirectly connected to the signal receiving end of the receiver, and the second end of the main inductor is connected to the input end of the low-noise amplifier; the first end of the first filtering module is connected with the first end of the main inductor, and the first end of the second filtering module is connected with the second end of the main inductor; the first filtering module and the second filtering module are alternatively involved in filtering; the first filtering module is configured to: when the filtering is participated, the filter can resonate with the main inductor at the first signal frequency; the second filtering module is configured to: when the filtering is participated, the filter can resonate with the main inductor at the second signal frequency; wherein the first signal frequency and the second signal frequency characterize different frequencies or frequency ranges of the signal.

Description

Low-noise amplifying circuit, control method thereof and electronic equipment

Technical Field

The present invention relates to the field of signal processing, and in particular, to a low noise amplifying circuit, a control method thereof, and an electronic device.

Background

With the continuous development of uplink carrier aggregation (ULCA, uplink Carrier Aggregation) technology, the use rate of the uplink carrier aggregation in the market is increasing, and as a plurality of carriers exist in the application of ULCA, a plurality of transmitters transmit signals when a receiver receives signals, so that interference of an RX signal frequency band of a receiving end can occur, the isolation is poor, and meanwhile, when the transmitter transmits at a specific frequency (for example, a half or a third of the receiving frequency), nonlinear conversion can be performed on a signal chain of the receiver, and the linearity can be reduced at both points.

Therefore, in the signal receiving and transmitting system adopting ULCA in the prior art, the isolation and linearity of the signal between the signal receiving side and the signal transmitting side are not good.

Disclosure of Invention

The invention provides a low-noise amplifying circuit, a control method thereof and electronic equipment, which are used for solving the problem of poor isolation and linearity of signals.

According to a first aspect of the present invention, there is provided a low noise amplification circuit comprising a band-stop filter and a low noise amplifier, the band-stop filter comprising a first filtering module, a second filtering module and a main inductor; the first end of the main inductor is directly or indirectly connected to the signal receiving end of the receiver, and the second end of the main inductor is connected to the input end of the low-noise amplifier; the first end of the first filtering module is connected with the first end of the main inductor, and the first end of the second filtering module is connected with the second end of the main inductor;

during at least part of the time, the first filtering module and the second filtering module are selected to participate in filtering;

The first filtering module is configured to: when filtering is participated, the main inductor and the main inductor can resonate at a first signal frequency;

the second filtering module is configured to: when filtering is participated, the main inductor and the main inductor can resonate at a second signal frequency;

wherein the first signal frequency and the second signal frequency characterize different frequencies or frequency ranges.

Optionally, the first filtering module includes at least one first filtering resonant circuit, and the first filtering resonant circuit includes a first radio frequency switch, a first capacitor, a first inductor, and a second radio frequency switch;

The first end of the first radio frequency switch is connected with the first end of the main inductor, the second end of the first radio frequency switch is connected with the first end of the first capacitor, the second end of the first capacitor is connected with the first end of the first inductor, and the second end of the first inductor is directly or indirectly grounded; the second radio frequency switch is connected to two ends of the first inductor;

when the first filtering module participates in filtering, the first radio frequency switch is closed, the second radio frequency switch is opened, and the first capacitor, the first inductor, the first radio frequency switch and the main inductor resonate at the first signal receiving frequency.

Optionally, the second filtering module includes at least one second filtering resonant circuit, and the second filtering resonant circuit includes a third radio frequency switch, a second capacitor, a second inductor, and a fourth radio frequency switch;

The first end of the third radio frequency switch is connected with the second end of the main inductor, the second end of the third radio frequency switch is connected with the first end of the second capacitor, the second end of the second capacitor is connected with the first end of the second inductor, and the second end of the second inductor is directly or indirectly grounded; the fourth radio frequency switch is connected to two ends of the second inductor.

When the second filtering module participates in filtering, the third radio frequency switch is closed, the fourth radio frequency switch is opened, and the second capacitor, the second inductor, the third radio frequency switch and the main inductor resonate and the second signal frequency.

Optionally, the frequency or frequency range characterized by the first signal frequency is one half of the signal receiving frequency.

Optionally, the frequency or frequency range characterized by the second signal frequency is one third of the signal receiving frequency.

Optionally, the low noise amplifying circuit applied to ULCA further includes a control module, connected to the first filtering module and the second filtering module, where the control module is configured to:

determining a signal emission frequency, wherein the signal emission frequency represents the frequency of a signal emitted by a transmitter currently or the frequency range of the signal emitted by the transmitter in the coverage range of the receiver;

and controlling the first filtering module or the second filtering module to participate in filtering according to the signal sending frequency.

Optionally, when the control module controls the first filtering module or the second filtering module to participate in filtering according to the signal sending frequency, the control module is specifically configured to:

If the signal sending frequency is matched with the first signal frequency, controlling the first filtering module to participate in filtering;

and if the signal sending frequency is matched with the second signal frequency, controlling the second filtering module to participate in filtering.

Optionally, the low noise amplifying circuit applied to ULCA further includes a fifth radio frequency switch;

the fifth radio frequency switch is connected in parallel with two ends of the main inductor.

Optionally, the low noise amplifying circuit applied to ULCA further includes a control module, where the control module is connected to the control end of the fifth radio frequency switch, and is configured to: and controlling the fifth radio frequency switch to be closed when the band-stop filter is not needed to participate in filtering.

Optionally, the low noise amplifying circuit applied to ULCA further includes a sixth radio frequency switch;

the second end of the first filtering module and the second end of the second filtering module are both connected to the first end of the sixth radio frequency switch, and the second end of the sixth radio frequency switch is grounded.

Optionally, the low noise amplifying circuit applied to ULCA further includes a control module, where the control module is connected to the control end of the sixth radio frequency switch, and is configured to: and when the band-stop filter is not needed to participate in filtering, controlling the sixth radio frequency switch to be turned off.

According to a second aspect of the present invention, there is provided a control method of the low noise amplifying circuit related to the first aspect and its alternative, the low noise amplifying circuit further includes a control module, the control module is connected to the first filtering module and the second filtering module respectively, and the control method is applied to the control module;

The control method comprises the following steps:

Determining a signal emission frequency, wherein the signal emission frequency represents the frequency of a signal emitted by a transmitter currently or the frequency range of the signal emitted by the transmitter currently;

Optionally, according to the signal sending frequency, controlling the first filtering module or the second filtering module to participate in filtering includes:

Optionally, the low noise amplifying circuit further comprises a fifth radio frequency switch; the fifth radio frequency switch is connected in parallel with two ends of the main inductor; the control module is connected with the control end of the fifth radio frequency switch;

The control method further comprises the following steps:

And controlling the fifth radio frequency switch to be closed when the band-stop filter is not needed to participate in filtering.

Optionally, the low noise amplifying circuit further includes a sixth radio frequency switch; the second end of the first filtering module and the second end of the second filtering module are both connected to the first end of the sixth radio frequency switch, and the second end of the sixth radio frequency switch is grounded; the control module is connected with the control end of the sixth radio frequency switch;

The control method further comprises the following steps:

And when the band-stop filter is not needed to participate in filtering, controlling the sixth radio frequency switch to be turned off.

According to a third aspect of the present invention there is provided an electronic device comprising a low noise amplifying circuit as referred to in the first aspect of the present invention and alternatives thereof.

The low noise amplifying circuit, the control method and the electronic equipment provided by the invention can help to filter signals with specific frequency by arranging the band-stop filter between the signal receiving end and the low noise amplifier, wherein the band-stop filter is provided with a plurality of switchable filter modules, and different filter modules resonate in different frequencies or frequency ranges.

Meanwhile, as the transmitting signal with a specific frequency (for example, one half or one third of the receiving frequency) can perform nonlinear conversion on a signal chain of the receiver, a basis can be provided for selecting a proper resonant frequency (for example, one half or one third of the receiving frequency) through selective filtering, so that nonlinear conversion is avoided or reduced, and the linearity of the signal is further ensured.

In addition, the connection mode of the two filter modules and the main inductor can form a pi-like filter, and compared with a T-shaped filter structure, the filter has the advantages of low insertion loss in an off state and good attenuation in an on state, and further, the power consumption of a system can be reduced while the isolation degree and the linearity of a circuit are ensured.

In a further scheme, the selection of the filtering module is made based on the frequency of the signal sent by the transmitter, so that the selected filtering module can be favorably matched with the signal possibly generating interference, and the isolation degree and the linearity of the signal are effectively improved.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic diagram of a low noise amplifier circuit applied to ULCA in accordance with one embodiment of the present invention;

FIG. 2 is a schematic diagram of a band reject filter according to an embodiment of the invention;

FIG. 3 is a schematic diagram of a band reject filter according to an embodiment of the invention;

FIG. 4 is a third schematic diagram of a band reject filter according to an embodiment of the invention;

FIG. 5 is a schematic diagram of a band reject filter according to an embodiment of the invention;

FIG. 6 is a schematic diagram of a band reject filter according to an embodiment of the invention;

FIG. 7 is a schematic diagram of a band reject filter according to an embodiment of the invention;

FIG. 8 is a schematic diagram of a band reject filter according to an embodiment of the invention;

FIG. 9 is a flow chart of a control method of the low noise amplifying circuit according to an embodiment of the invention;

FIG. 10 is a flow chart of a second embodiment of a control method of the low noise amplifying circuit;

FIG. 11 is a flowchart of a control method of a low noise amplifying circuit according to an embodiment of the invention;

fig. 12 is a circuit diagram of a low noise amplifier according to an embodiment of the invention.

Reference numerals illustrate:

1-a band reject filter;

11-a first filtering module;

12-a second filtering module;

A 2-low noise amplifier;

21-a cascode input module;

a 22-current multiplexing module;

221-a bias voltage unit;

a 23-load module;

A 24-bias voltage module;

241-a current mirror unit;

25-a filtering module;

3-a control module;

ls—main inductance;

s1-a first radio frequency switch;

s2-a second radio frequency switch;

S3-a third radio frequency switch;

s4-a fourth radio frequency switch;

s5-a fifth radio frequency switch;

S6-a sixth radio frequency switch;

Cp 1-a first capacitance;

Cp 2-second capacitor;

Lp 1-a first inductance;

lp 2-second inductance;

m1-a first transistor;

M2-a second transistor;

m3-a third transistor;

M4-fourth transistors;

Vcg-power port;

Cout-output capacitance;

Vdd-power supply;

lcd 1-a first energy storage inductance;

Lcd 2-second energy storage inductance;

lcd 3-third energy storage inductance;

Lg-matching inductance;

Ls-source degeneration inductance;

Cblock-a first bias capacitance;

cm-a second bias capacitance;

ccd-blocking capacitance;

cin-input capacitance;

ccg-filter capacitance;

Rbcd-a first resistor;

Rcs-second resistor;

rbcg-a filter resistor;

Ibias-bias current.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The technical scheme of the invention is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.

Furthermore, the term "coupled" in the specification and claims means electrically coupled, and may include direct or indirect coupling.

The low noise filter circuit applied to ULCA according to the embodiment of the present invention may be understood as a circuit portion for implementing low noise filtering in a system employing ULCA technology, which may be a separate chip or may be a part of a chip.

Referring to fig. 1, an embodiment of the present invention provides a low noise amplifying circuit applied to ULCA, which includes a band reject filter 1 and a low noise amplifier 2; the output of the band reject filter 1 may be directly or indirectly connected to the input of the low noise amplifier 2.

The low noise amplifier 2 may be characterized as an LNA, specifically: lowNoiseAmplifier. Which may be a separate chip or may be part of a chip.

Referring to fig. 2, and referring to fig. 1, the band-reject filter 1 includes a first filter module 11, a second filter module 12, and a main inductor Ls;

A first terminal of the main inductor Ls is directly or indirectly connected to a signal receiving terminal of a receiver (e.g. may be connected to an antenna via a related circuit), the received signal may be characterized as Vin, a second terminal of the main inductor Ls is connected to an input terminal of the low noise amplifier 2, and the transmitted signal may be characterized as Vlna; the first end of the first filtering module 11 is connected to the first end of the main inductor Ls, and the first end of the second filtering module 12 is connected to the second end of the main inductor Ls;

During at least part of the time, the first filtering module 11 and the second filtering module 12 participate in filtering alternatively;

in some examples, during another part of the time, neither the first filtering module 11 nor the second filtering module 12 may participate in the filtering; in addition, the embodiment of the present invention does not exclude the case that the first filtering module 11 and the second filtering module 12 participate in filtering at the same time.

The first filtering module 11 is configured to: when participating in filtering, can resonate with the main inductance Ls at a first signal frequency;

the second filtering module 12 is configured to: being able to resonate with said main inductance Ls at a second signal frequency while participating in filtering;

Wherein the first signal frequency and the second signal frequency characterize different frequencies or frequency ranges of a signal.

Wherein the first filtering module 11 and the second filtering module 12 are alternatively involved in filtering, it is understood that when the first filtering module 11 is involved in filtering, the second filtering module 12 is not involved in filtering; when the second filtering module 12 participates in the filtering, the first filtering module 11 does not participate in the filtering.

For the case where the first filtering module 11 participates in filtering, it can be understood that: when the input signal matches the first signal frequency and the first filter module 11 is turned on, the main inductor Ls is also connected to the circuit, and the main inductor Ls resonates with the first filter module 11, so as to filter the signal.

For the case where the second filtering module 12 participates in filtering, it can be understood that: when the input signal matches the second signal frequency and the second filter module 12 is turned on, the main inductor Ls is also connected to the circuit, and the main inductor Ls resonates with the second filter module 12, so as to filter the signal.

In an embodiment, referring to fig. 3, the first filter module 11 includes at least one first filter resonant circuit, and the first filter resonant circuit includes a first rf switch S1, a first capacitor Cp1, a first inductor Lp1 and a second rf switch S2;

The first end of the first radio frequency switch S1 is connected to the first end of the main inductor Ls, the second end of the first radio frequency switch S1 is connected to the first end of the first capacitor Cp1, the second end of the first capacitor Cp1 is connected to the first end of the first inductor Lp1, and the second end of the first inductor Lp1 is directly or indirectly grounded; the second radio frequency switch S2 is connected to two ends of the first inductor Lp 1;

When the first filtering module 11 participates in filtering, the first rf switch S1 is closed, the second rf switch S2 is opened, and the first capacitor Cp1, the first inductor Lp1, the first rf switch S1 and the main inductor Ls resonate at the first signal frequency.

In one example, the first and second rf switches S1 and S2 are excellent rf switches using RFsoi technology of 60nm technology.

In one example, the first filter module 11 includes a first filter resonant circuit, and in other examples, the first filter module 11 may also include a plurality of first filter resonant circuits, where the first filter module 11 includes a plurality of first filter resonant circuits, the plurality of first filter resonant circuits may be connected in parallel between the first end of the main inductor Ls and the ground.

In one example, each first filter resonant circuit of the first filter module 11 can resonate with the main inductor Ls at the same frequency or frequency range, and in another example, each first filter resonant circuit of the first filter module 11 can resonate with the main inductor Ls at a different signal frequency or frequency range, so long as it is within the range of the first signal frequency, and can be understood as the first filter resonant circuit in the first filter module 11.

In an embodiment, referring to fig. 4, the second filtering module 12 includes at least one second filtering resonant circuit, and each second filtering resonant circuit includes a third rf switch S3, a second capacitor Cp2, a second inductor Lp2 and a fourth rf switch S4;

The first end of the third radio frequency switch S3 is connected to the second end of the main inductor Ls, the second end of the third radio frequency switch S3 is connected to the first end of the second capacitor Cp2, the second end of the second capacitor Cp2 is connected to the first end of the second inductor Lp2, and the second end of the second inductor Lp2 is directly or indirectly grounded; the fourth rf switch S4 is connected to two ends of the second inductor Lp 2.

When the second filtering module 12 participates in filtering, the third rf switch S3 is turned on, the fourth rf switch S4 is turned off, and the second capacitor Cp2, the second inductor Lp2, the second rf switch S2 and the main inductor Ls resonate at the second signal frequency.

In one example, the third and fourth rf switches S3, S4 are excellent rf switches using RFsoi technology in a 60nm process.

In one example, the second filter module 12 includes a second filter resonant circuit, and in other examples, the second filter module 12 may also include a plurality of second filter resonant circuits, where the second filter module 12 includes a plurality of second filter resonant circuits, the plurality of second filter resonant circuits are connected in parallel between the second end of the main inductor Ls and the ground.

In one example, each second filter resonant circuit of the second filter module 12 can resonate with the main inductor Ls at the same frequency or frequency range, and in another example, each second filter resonant circuit of the second filter module 12 can resonate with the main inductor Ls at a different frequency or frequency range, so long as it is within the range of the second signal frequency, which can be understood as the second filter circuit of the second filter module 12.

Therefore, the low noise amplifying circuit provided by the embodiment of the invention can help to filter signals with specific frequency by arranging the band-stop filter 1 between the signal receiving end and the low noise amplifier, wherein, as the band-stop filter 1 is provided with a plurality of switchable filter modules and different filter modules resonate in different frequencies or frequency ranges, the embodiment of the invention can avoid filtering by adopting the same filter module for all signals to be filtered, and further can provide a basis for selecting a more suitable filter module (for example, selecting a filter module with resonant frequency matched with the sending frequency of the transmitter), and further can help to improve the isolation degree of signals at the receiving side and the sending side, thereby helping to ensure the linearity of the signals.

In one embodiment, the first signal frequency is characterized by a frequency or frequency range that is one-half of the signal receiving frequency;

in one embodiment, the second signal frequency is characterized by a frequency or frequency range that is one third of the signal receiving frequency.

Further: when the transmitter transmits at half receiving frequency, the first radio frequency switch S1 is closed, the second radio frequency switch S2 is opened, and the main inductor Ls resonates with the first radio frequency switch S1, the first capacitor Cp1 and the first inductor Lp 1; when the transmitter transmits at one third of the receiving frequency, the third rf switch S3 is closed, the fourth rf switch S4 is opened, and the main inductor Ls resonates with the third rf switch S3, the second capacitor Cp2, and the second inductor Lp 2.

The second rf switch S2 and the fourth rf switch S4 function to optimize the input impedance at the in-band frequency and to adjust noise and gain performance.

Therefore, the low-noise amplifying circuit provided by the invention can be used for carrying out nonlinear conversion on a signal chain of a receiver due to the fact that a transmitting signal with a specific frequency (for example, one half or one third of the receiving frequency), and can provide a basis for selecting a proper resonant frequency (for example, one half or one third of the receiving frequency) through selective filtering, so that nonlinear conversion is avoided or reduced, and the linearity of the signal is further ensured.

In one embodiment, please refer to fig. 5, further comprising a control module 3 connected to the first filtering module 11 and the second filtering module 12, respectively, the control module 3 is configured to:

and controlling the first filtering module 11 or the second filtering module 12 to participate in filtering according to the signal emission frequency.

The mode of determining the signal sending frequency may be any mode, for example, may be determined by reading an operating parameter related to the transmitter, or may be determined by sampling a sending signal, or may be manually preset, which does not depart from the scope of the embodiment of the present invention.

Further, according to the signal sending frequency, controlling the first filtering module or the second filtering module to participate in filtering may include:

If the signal sending frequency is matched with the first signal frequency, controlling the first filtering module to participate in filtering; at this time, the first filtering module and the second filtering module are alternatively involved in filtering, so the second filtering module is not involved in filtering at this time;

And if the signal sending frequency is matched with the second signal frequency, controlling the second filtering module to participate in filtering, wherein the first filtering module does not participate in filtering at the moment because the first filtering module and the second filtering module are alternatively involved in filtering.

Specifically, referring to fig. 5, the control module 3 is connected to the first rf switch S1, the second rf switch S2, the third rf switch S3, and the fourth rf switch S4, and controls the on/off of the first rf switch S1, the second rf switch S2, the third rf switch S3, and the fourth rf switch S4, so as to further control the filtering module involved in filtering.

In addition, the control of different switches can be performed by the same control module, or can be performed by different control modules, or can be performed by different control units of the same control module, and the control function can be realized by circuit hardware of the control module, or can be realized by cooperation of the circuit hardware and software, or can be realized by software.

In one embodiment, referring to fig. 6, the band reject filter 1 further includes a fifth rf switch S5; the fifth rf switch S5 is connected in parallel to two ends of the main inductor Ls.

In an embodiment, referring to fig. 6, the band-stop filter 1 further includes a sixth rf switch S6, the second end of the first filtering module 11 and the second end of the second filtering module 12 are both connected to the first end of the sixth rf switch S6, and the second end of the sixth rf switch S6 is grounded.

In one example, the fifth and sixth rf switches S5 and S6 are excellent rf switches using RFsoi technology of 60nm technology.

In an example, referring to fig. 7, when the transmitter transmits at half of the receiving frequency, the first rf switch S1 is closed, the second rf switch S2 is opened, the fifth rf switch S5 is opened, the sixth rf switch S6 is closed, and the main inductor Ls resonates with the first rf switch S1, the first capacitor Cp1 and the first inductor Lp 1; when the transmitter transmits at one third of the receiving frequency, the third radio frequency switch S3 is closed, the fourth radio frequency switch S4 is opened, the fifth radio frequency switch S5 is opened, the sixth radio frequency switch S6 is closed, and the main inductor Ls resonates with the third radio frequency switch S3, the second capacitor Cp2 and the second inductor Lp 2.

When the band elimination filter 1 is not needed to participate in the filtering, the fifth radio frequency switch S5 is closed, and the sixth radio frequency switch S6 is opened. Therefore, when the fifth radio frequency switch S5 and the sixth radio frequency switch S6 do not need to filter, the band-stop filter 1 can not work, the influence of the band-stop filter 1 on the system is reduced while the power consumption is reduced, the advantages of low insertion loss in the off state and good attenuation in the on state are achieved, and further, the power consumption of the system can be reduced while the isolation degree and the linearity of the circuit are ensured.

In one embodiment, referring to fig. 8, the control module 13 is further connected to the control terminal of the fifth rf switch S5, for: the fifth rf switch S5 is controlled to be closed when the band reject filter 1 is not needed to participate in the filtering.

In one embodiment, referring to fig. 8, the control module 13 is further connected to a control terminal of the sixth rf switch S6, for: the sixth rf switch S6 is controlled to be turned off when the band-stop filter 1 is not required to participate in the filtering.

The determination result of whether to participate in filtering without using the band-stop filter 1 may be determined by the control module 13 automatically according to a preset condition, or may be specified under manual intervention.

In one example, the first signal frequency is 5.15GHz and the second signal frequency is

At 5.925GHz, under the signal frequency, the specific scheme can inhibit all TX signals which possibly interfere with the 5.15GHz to 5.925GHz working frequency bands, and experimental data prove that when the band-pass rejection filter 1 is conducted, the noise coefficient is 1.9dB; when the band-stop filter 1 is not conducted, the noise coefficient is 1.3dB, and the system has good isolation no matter whether the band-stop filter 1 works or not.

In other examples, the first signal frequency and the second signal frequency may be any other values, and the first signal frequency and the second signal frequency may be determined based on a limited number of experimental and/or theoretical derivations.

Therefore, the selection of the filtering module is made based on the frequency of the signal sent by the transmitter, so that the selected filtering module can be favorably matched with the signal possibly generating interference, and the isolation degree and the linearity of the signal are effectively improved.

The embodiment of the invention provides a control method of a low-noise amplifying circuit, which can be applied to the control modules shown in fig. 5 and 8, and related technical terms, alternative implementations and technical effects can be understood by referring to the description of the low-noise amplifier and the low-noise amplifying circuit.

As mentioned above, the low noise amplifying circuit further includes a control module, the control module is connected to the first filtering module and the second filtering module, respectively, and the control method is applied to the control module;

referring to fig. 9, the control method includes:

S71: determining a signal emission frequency, wherein the signal emission frequency represents the frequency of a signal emitted by a transmitter currently or the frequency range of the signal emitted by the transmitter currently;

s72: and controlling the first filtering module or the second filtering module to participate in filtering according to the signal sending frequency.

In one embodiment, referring to fig. 10, step S72 includes:

s721: whether the signal emission frequency is matched with the first signal frequency;

If the determination result of step S721 is yes, step S722 may be implemented: controlling the first filtering module to participate in filtering;

If the determination result in step S721 is no, step S723 may be performed: whether the signal emission frequency matches the second signal frequency;

if the determination result in step S723 is yes, step S724 may be implemented: and controlling the second filtering module to participate in filtering.

The sequence of the steps is not limited to the above examples, and as long as the matching judgment of the signal sending frequency and the first signal frequency and the second signal frequency is realized and the corresponding control means are executed, the method does not deviate from the scope of the embodiment of the invention.

In one embodiment, as mentioned above, the low noise amplifying circuit may further include a fifth radio frequency switch; the fifth radio frequency switch is connected in parallel with two ends of the main inductor; the control module is connected with the control end of the fifth radio frequency switch;

in one embodiment, as mentioned above, the low noise amplifying circuit may further include a sixth radio frequency switch; the second end of the first filtering module and the second end of the second filtering module are both connected to the first end of the sixth radio frequency switch, and the second end of the sixth radio frequency switch is grounded; the control module is connected with the control end of the sixth radio frequency switch;

Referring to fig. 11, the control method further includes:

S73: whether the band-stop filter is needed to participate in filtering or not;

If the determination result in step S73 is no, step S74 and step S75 may be implemented respectively:

s74: controlling the fifth radio frequency switch to be closed

S75: and controlling the sixth radio frequency switch to be closed.

The above steps S74 and S75 may be performed in the order shown in fig. 11, or step S75 may be performed before step S74 is performed, or may be performed in parallel.

In one embodiment, referring to fig. 12, the low noise amplifier 2 may include: a cascode input module 21, a load module 23, and a current multiplexing module 22; the cascode input module 21 includes a first transistor M1 and a second transistor M2; the load module 23 includes a first energy storage inductor Lcd1, a second energy storage inductor Lcd2, and a third energy storage inductor Lcd3;

The gate of the first transistor M1 is directly or indirectly connected to the signal input Vlna, the drain of the first transistor M1 is connected to the source of the second transistor M2, the drain of the second transistor M2 is directly or indirectly connected to the input side of the current multiplexing module 22, and the first end of the second energy storage inductor Lcd2,

The first end of the first energy storage inductor Lcd1 is connected to the output side of the current multiplexing module 22 and is connected to a power supply Vdd through the current multiplexing module 22, the second end of the first energy storage inductor Lcd1 is connected between the second energy storage inductor Lcd2 and the third energy storage inductor Lcd3, the second end of the second energy storage inductor Lcd2 is connected to the first end of the third energy storage inductor Lcd3, and the second end of the third energy storage inductor Lcd3 is connected to the output capacitor Cout;

the current multiplexing module 22 is configured to be able to multiplex the current received at its input to the load module 23.

In one example, the first transistor M1 is an NMOS transistor, and the second transistor M2 is an NMOS transistor; in other examples, a conversion scheme using other transistors (e.g. transistors) to achieve similar functions is not excluded.

Therefore, the low noise amplifier provided by the scheme can reuse the current received by the input side to the load module 23 by using the current multiplexing module 22, thereby avoiding the external power supply from being additionally connected and reducing the overall power consumption of the low noise amplifier.

Specifically, the first end of the first energy storage inductor Lcd1 is connected to the output side of the current multiplexing module 22, and is connected to the power supply Vdd through the current multiplexing module 22, the second end of the first energy storage inductor Lcd1 is connected between the second energy storage inductor Lcd2 and the third energy storage inductor Lcd3, the first end of the second energy storage inductor Lcd2 is connected to the drain electrode of the second transistor M2, the second end of the second energy storage inductor Lcd2 is connected to the first end of the third energy storage inductor Lcd3, and the second end of the third energy storage inductor Lcd3 is connected to the output capacitor Cout.

The output capacitor Cout, the first energy storage inductor Lcd1 and the channel resistance of the third transistor M3 form a first-stage resonant network.

In one example, the energy storage inductance is a gm-boost energy storage inductance.

In addition, since the Q value of the energy storage inductor (i.e., the quality factor of the inductor) can influence the attenuation degree of the gain, the energy storage inductor with a higher Q value is selected, so that the attenuation degree of the gain can be reduced to a certain extent. Meanwhile, the combination of the three energy storage inductors can form an overall high Q value, and the attenuation of the gain is reduced.

Therefore, compared with the technical scheme of the transformer and the multistage resonant network, the low-noise amplifier provided by the scheme reduces the chip area, and meanwhile, as the type selection range of the energy storage inductors is wider, a foundation is provided for further providing larger bandwidth.

In addition, embodiments of the present invention may facilitate a wideband 50 ohm optimal impedance match versus a common single ended cascode configuration (cascode configuration) and low noise amplifier with capacitive divider.

In one embodiment, the positive correlation between the current on the output side of the current multiplexing module 22 and the current on the input side of the current multiplexing module 22 can be understood as: the output side current of the current multiplexing module 22 increases with an increase in the input side current and decreases with a decrease in the input side current.

In one embodiment, the current multiplexing module 22 includes a third transistor M3 bias voltage unit 221;

The gate of the third transistor M3 is directly or indirectly connected to the drain of the second transistor M2, the source of the third transistor M3 is connected to the first end of the first energy storage inductor Lcd1, the drain of the third transistor M3 is connected to the power supply Vdd, and the bias voltage unit 221 is connected between the gate and the drain of the third transistor M3 to provide a first bias voltage between the gate and the drain of the third transistor M3.

In one example, the third transistor M3 is an NMOS transistor, and in other examples, a conversion scheme using other transistors (e.g., transistors) to achieve similar functions is not excluded.

In one embodiment, the bias voltage unit 221 includes a first resistor Rbcd and a first bias capacitor Cblock;

A first end of the first resistor Rbcd is connected to the drain of the third transistor M3, and a second end of the first resistor Rbcd is connected to the gate of the third transistor M3. A first end of the first bias capacitor Cblock is connected to the drain of the third transistor M3, and a second end of the first bias capacitor Cblock is grounded.

In one embodiment, the size of the third transistor M3 is smaller than the size of the second transistor M2, and the parasitic capacitance of the third transistor M3 is smaller than the parasitic capacitance of the second transistor M2.

As can be seen, in the low noise amplifier of the above embodiment, since the size of the transistor in the current multiplexing module 22 is small, the capacity of the parasitic capacitance is also small, so that the attenuation of the voltage gain can be reduced, and thus the loss of the in-band gain can be reduced.

In one embodiment, the circuit further includes a blocking capacitor Ccd, and the drain of the second transistor M2 is connected to the input side of the current multiplexing module 22 through the blocking capacitor Ccd.

In one embodiment, the bias voltage module 24 and the source degeneration inductance Ls are also included;

The source of the first transistor M1 is connected to the first end of the source degeneration inductance Ls, the second end of the source degeneration inductance Ls is grounded, one side of the bias voltage module 24 is connected to the gate of the first transistor M1, and the other side of the bias voltage module 24 is connected to the second end of the source degeneration inductance Ls, so as to form a second bias voltage between the gate and the source of the first transistor M1.

In one embodiment, the bias voltage module 24 includes a current mirror unit 241, a second resistor Rcs, and a second bias capacitor Cm;

The current mirror unit 241 may be any circuit structure capable of providing the bias current Ibias to the circuit by means of current mirroring, and in the circuit shown in the figure, only the fourth transistor M4 is shown, and the specific circuit structure thereof may be understood by referring to the current mirror already existing or modified in the art, and will be described in detail herein.

The output end of the current mirror unit is connected to the first end of the second resistor Rcs (for example, the gate and the drain of the fourth transistor M4 are connected to the first end of the second resistor Rcs), the second end of the second resistor Rcs is connected to the gate of the first transistor M1, the first end of the second bias capacitor Cm is connected to the first end of the second resistor Rcs, and the second end of the second bias capacitor Cm is grounded.

In one example, the fourth transistor M4 may be an NMOS transistor, and in other examples, a conversion scheme using other transistors (e.g., transistors) to achieve similar functions is not excluded.

In one embodiment, the circuit further includes a filtering module 25, an input side of the filtering module 25 is connected to the power supply port Vcg, and an output side of the filtering module 25 is connected to the gate of the second transistor M2.

In one embodiment, the filtering module 25 includes a filtering resistor Rbcg and a filtering capacitor Ccg; the first end of the filter resistor Rbcg is connected to the power supply port Vcg, the second end of the filter resistor Rbcg is connected to the gate of the second transistor M2, the first end of the filter capacitor Ccg is connected to the second end of the filter resistor Rbcg, and the second end of the filter capacitor Ccg is grounded.

In one embodiment, the circuit further comprises a matching inductance Lg and an input capacitance Cin;

The first end of the matching inductance Lg is connected to the signal input end Vlna, the second end of the matching inductance Lg is connected to the first end of the input capacitor Cin, and the second end of the input capacitor Cin is connected to the gate of the first transistor M1.

The input capacitor Cin and the second bias resistor Rcs also play a role of filtering. The matching inductance Lg, the first transistor M1, and the parasitic capacitance thereof and the source degeneration inductance LS described above form a second-stage resonant network.

In one example, the source degeneration inductor Ls and the matching inductor Lg may be implemented by using the SOI technology of a low-resistance aluminum layer and two copper layers to realize an on-chip inductor with a high quality factor. Embodiments of the present invention do not exclude implementations using other inductors.

The invention also provides electronic equipment, which comprises the low-noise amplifying circuit of any optional scheme.

The above electronic device may be any electronic device with a communication function, for example, may be a mobile phone, a tablet computer, a computer, an intelligent wearable device, a network device, a vehicle-mounted device, and other devices dedicated to communication or not dedicated to communication, etc.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. The low-noise amplifying circuit applied to ULCA is characterized by comprising a band-stop filter, a low-noise amplifier and a control module, wherein the band-stop filter comprises a first filtering module, a second filtering module and a main inductor; the first end of the main inductor is directly or indirectly connected to the signal receiving end of the receiver, and the second end of the main inductor is connected to the input end of the low-noise amplifier; the first end of the first filtering module is connected with the first end of the main inductor, and the first end of the second filtering module is connected with the second end of the main inductor; the control module is respectively connected with the first filtering module and the second filtering module;

wherein the first signal frequency and the second signal frequency characterize different frequencies or frequency ranges;

The control module is used for:

according to the signal sending frequency, the first filtering module or the second filtering module is controlled to participate in filtering, and the method is specifically used for:

2. The low noise amplifier circuit of claim 1 applied to ULCA, wherein said first filter module comprises at least one first filter resonant circuit comprising a first radio frequency switch, a first capacitor, a first inductor and a second radio frequency switch;

when the first filtering module participates in filtering, the first radio frequency switch is closed, the second radio frequency switch is opened, and the first capacitor, the first inductor, the first radio frequency switch and the main inductor resonate at the first signal frequency.

3. The low noise amplifier circuit of claim 1 applied to ULCA, wherein said second filter module comprises at least one second filter resonant circuit comprising a third rf switch, a second capacitor, a second inductor and a fourth rf switch;

The first end of the third radio frequency switch is connected with the second end of the main inductor, the second end of the third radio frequency switch is connected with the first end of the second capacitor, the second end of the second capacitor is connected with the first end of the second inductor, and the second end of the second inductor is directly or indirectly grounded; the fourth radio frequency switch is connected to two ends of the second inductor;

4. The low noise amplification circuit of claim 1 applied to ULCA, wherein said first signal frequency is characterized by a frequency or frequency range that is one half of a frequency of said signal receiver.

5. The low noise amplification circuit of claim 1 applied to ULCA, wherein said second signal frequency is characterized by a frequency or frequency range that is one third of a frequency of said signal receiving end.

6. The low noise amplifier circuit applied to ULCA as defined in any one of claims 1 to 5, further comprising a fifth radio frequency switch;

7. The low noise amplifier circuit of claim 6, further comprising a control module coupled to the control terminal of the fifth rf switch for: and controlling the fifth radio frequency switch to be closed when the band-stop filter is not needed to participate in filtering.

8. The low noise amplifier circuit applied to ULCA as defined in any one of claims 1 to 5, further comprising a sixth radio frequency switch;

9. The low noise amplifier circuit of claim 8, further comprising a control module coupled to the control terminal of the sixth rf switch for: and when the band-stop filter is not needed to participate in filtering, controlling the sixth radio frequency switch to be turned off.

10. A control method of a low noise amplifying circuit according to any one of claims 1 to 5, wherein said low noise amplifying circuit further comprises a control module, said control module being connected to said first filter module and said second filter module, respectively, said control method being applied to said control module;

The control method comprises the following steps:

11. The control method according to claim 10, wherein controlling the first filtering module or the second filtering module to participate in filtering according to the signal emission frequency includes:

12. The control method according to claim 10 or 11, characterized in that the low noise amplification circuit further comprises a fifth radio frequency switch; the fifth radio frequency switch is connected in parallel with two ends of the main inductor; the control module is connected with the control end of the fifth radio frequency switch;

The control method further comprises the following steps:

13. The control method according to claim 10 or 11, characterized in that the low noise amplification circuit further comprises a sixth radio frequency switch; the second end of the first filtering module and the second end of the second filtering module are both connected to the first end of the sixth radio frequency switch, and the second end of the sixth radio frequency switch is grounded; the control module is connected with the control end of the sixth radio frequency switch;

The control method further comprises the following steps:

14. An electronic device comprising the low noise amplifier circuit of any one of claims 1 to 9.