CN213783252U - Low-noise amplifying circuit and electronic equipment - Google Patents

Abstract

The utility model provides a low noise amplifier circuit and electronic equipment, low noise amplifier circuit wherein, include: the band elimination 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 with the input end of the low-noise amplifier; the first end of the first filtering module is connected to the first end of the main inductor, and the first end of the second filtering module is connected to the second end of the main inductor; the first filtering module is configured to: being capable of resonating with a primary inductor at a first signal frequency while participating in filtering; the second filtering module is configured to: being capable of resonating with the main inductor at a second signal frequency while participating in the filtering; wherein the first signal frequency and the second signal frequency characterize different frequencies or frequency ranges of the signal.

Description

Low-noise amplifying circuit and electronic equipment

Technical Field

The utility model relates to a signal processing field especially relates to a low noise amplifier circuit and electronic equipment.

Background

With the continuous development of Uplink Carrier Aggregation (ULCA), the usage rate in the market is increasing, because there are multiple carriers in ULCA application, when a receiver receives signals, there are multiple transmitters transmitting signals, so that interference of RX signal frequency band of a receiving end occurs, the isolation is not good, and when a transmitter transmits at a specific frequency (for example, one half or one third of the receiving frequency), nonlinear conversion is performed in the signal chain of the receiver, which both causes the linearity to be reduced.

As can be seen, in the prior art, in the signal transceiving system using ULCA, the isolation and linearity of the signal between the signal receiving side and the signal transmitting side are not good.

SUMMERY OF THE UTILITY MODEL

The utility model provides a low noise amplifier circuit and electronic equipment to solve the isolation and the not good problem of linearity of signal.

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

the first filtering module is configured to: being resonant with the primary inductance at a first signal frequency when participating in filtering;

the second filtering module is configured to: being resonant with the primary inductor at a second signal frequency when participating in filtering;

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 to the first end of the main inductor, the second end of the first radio frequency switch is connected to the first end of the first capacitor, the second end of the first capacitor is connected to 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 to the second end of the main inductor, the second end of the third radio frequency switch is connected to the first end of the second capacitor, the second end of the second capacitor is connected to 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 with the second signal frequency.

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

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

Optionally, the low-noise amplifier circuit applied to the ULCA further includes a control module, which is respectively connected to the first filtering module and the second filtering module.

Optionally, the low-noise amplifier circuit applied to the 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 amplifier circuit applied to the ULCA further includes a control module, and the control module is connected to the control terminal of the fifth radio frequency switch.

Optionally, the low-noise amplifier circuit applied to the 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 amplifier circuit applied to the ULCA further includes a control module, and the control module is connected to the control terminal of the sixth radio frequency switch.

According to a second aspect of the present invention, there is provided an electronic device, including the low-noise amplifier circuit according to the first aspect of the present invention and the optional aspect thereof.

The utility model provides a low noise amplifier circuit and electronic equipment, through set up band elimination filter between signal receiving terminal and low noise amplifier, can help filtering the signal of specific frequency, wherein, because band elimination filter has a plurality of changeable filtering modules, and different filtering modules syntonizes in different frequency or frequency range, the utility model discloses can help avoiding all adopting same filtering module to filter to all the signals that remain to filter, provide the basis for selecting more suitable filtering module (for example, select resonant frequency and transmitter to send out frequency assorted filtering module), and then, can help improving the isolation of receiving side and transmitting side signal to help guaranteeing the linearity of signal.

Meanwhile, since the transmitted signal of a specific frequency (for example, one-half or one-third of the receiving frequency) is converted nonlinearly on the signal chain of the receiver, selective filtering can provide a basis for selecting a proper resonance frequency (for example, one-half or one-third of the receiving frequency), so that the nonlinear conversion is avoided or reduced, and the linearity of the signal is further ensured.

In addition, the connection mode of the two filtering modules and the main inductor can form a pi-type-like filter, and compared with a T-type 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 guaranteed.

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

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic diagram of a low noise amplifier circuit applied to ULCA in an embodiment of the present invention;

fig. 2 is a first schematic diagram of a band-stop filter according to an embodiment of the present invention;

fig. 3 is a second schematic diagram of the band-stop filter in an embodiment of the present invention;

fig. 4 is a third schematic diagram of the band-stop filter in an embodiment of the present invention;

fig. 5 is a fourth schematic diagram of the band elimination filter in an embodiment of the present invention;

fig. 6 is a fifth schematic diagram of a band elimination filter according to an embodiment of the present invention;

fig. 7 is a sixth schematic diagram of a band-stop filter according to an embodiment of the present invention;

fig. 8 is a seventh schematic diagram of a band stop filter according to an embodiment of the present invention;

fig. 9 is a first schematic flow chart of a control method of the low noise amplifier circuit according to an embodiment of the present invention;

fig. 10 is a schematic flow chart of a control method of the low noise amplifier circuit according to an embodiment of the present invention;

fig. 11 is a third schematic flow chart of a control method of the low noise amplifier circuit according to an embodiment of the present invention;

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

Description of reference numerals:

1-a band stop filter;

11-a first filtering module;

12-a second filtering module;

2-a low noise amplifier;

21-a cascode input module;

22-a current multiplexing module;

221-bias voltage unit;

23-a load module;

24-a 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-first capacitance;

cp2 — second capacitance;

lp 1-first inductance;

lp 2-second inductance;

m1 — first transistor;

m2 — second transistor;

m3 — third transistor;

m4 — fourth transistor;

vcg-power supply port;

cout-output capacitance;

vdd-supply;

lcd 1-first energy storage inductor;

lcd 2-second energy storage inductor;

lcd 3-third energy storage inductor;

lg-matched inductance;

ls-source degeneration inductance;

cblock-first bias capacitance;

cm-a second bias capacitance;

ccd-a DC blocking capacitance;

cin — input capacitance;

ccg-filter capacitance;

rbcd-first resistance;

rcs — second resistance;

rbcg-filter resistance;

ibias-bias current.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation 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 solution of the present invention will be described in detail with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Furthermore, the term "coupled" as used in the description and claims of the present invention refers to electrical connections, which may include direct connections or indirect connections.

The embodiment of the present invention relates to a low noise filter circuit applied to ULCA, which can be a circuit part for realizing low noise filtering in a system adopting the ULCA technology, and can be an independent chip and also a part of the chip.

Referring to fig. 1, an embodiment of the present invention provides a low noise amplifier circuit applied to ULCA, including a band-stop filter 1 and a low noise amplifier 2; wherein, the output end of the band-stop filter 1 can be directly or indirectly connected with the input end of the low noise amplifier 2.

The low noise amplifier 2 may be characterized as an LNA, and specifically includes: LowNoiseAmplifier. It may be a separate chip or part of a chip.

Referring to fig. 2 in conjunction with fig. 1, the band-stop filter 1 includes a first filter module 11, a second filter module 12 and a main inductor Ls;

a first end of the primary inductor Ls is directly or indirectly connected to a signal receiving end of the receiver (for example, may be connected to an antenna via a related circuit), the received signal may be represented by Vin, a second end of the primary inductor Ls is connected to an input end of the low noise amplifier 2, and the transmitted signal may be represented by Vlna; a first end of the first filtering module 11 is connected to a first end of the main inductor Ls, and a first end of the second filtering module 12 is connected to a second end of the main inductor Ls;

at least part of the time, the first filtering module 11 and the second filtering module 12 are selected to participate in filtering;

in some examples, in another part of the time, the first filtering module 11 and the second filtering module 12 may not participate in filtering; furthermore, the embodiment of the present invention does not exclude the situation that the first filtering module 11 and the second filtering module 12 participate in filtering at the same time in some times.

The first filtering module 11 is configured to: being capable of resonating at a first signal frequency with said primary inductance Ls while participating in filtering;

the second filtering module 12 is configured to: being capable of resonating with said primary inductor 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 the signal.

The first filtering module 11 and the second filtering module 12 are selected to participate in filtering, and it can be understood that, when the first filtering module 11 participates in filtering, the second filtering module 12 does not participate 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 the filtering, it can be understood that: when the input signal is matched with the first signal frequency, the first filtering module 11 is conducted, and the main inductor Ls is also connected into the circuit, the main inductor Ls resonates with the first filtering module 11 and the like, so that the signal is filtered.

For the case where the second filtering module 12 participates in the filtering, it can be understood that: when the input signal is matched with the second signal frequency, the second filtering module 12 is conducted, and the main inductor Ls is also connected into the circuit, the main inductor Ls resonates with the second filtering module 12 and the like, so that the signal is filtered.

In one 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;

a first terminal of the first rf switch S1 is connected to a first terminal of the main inductor Ls, a second terminal of the first rf switch S1 is connected to a first terminal of the first capacitor Cp1, a second terminal of the first capacitor Cp1 is connected to a first terminal of the first inductor Lp1, and a second terminal of the first inductor Lp1 is directly or indirectly connected to ground; 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 rf switch S1 and the second rf switch S2 are both good rf switches using RFsoi technology of 60nm technology.

In one example, the first filtering module 11 includes a first filtering resonant circuit, and in another example, the first filtering module 11 may also include a plurality of first filtering resonant circuits, and when the first filtering module 11 includes a plurality of first filtering resonant circuits, the plurality of first filtering 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 different signal frequencies or frequency ranges, which can be understood as the first filter resonant circuit in the first filter module 11 as long as it is within the range of the first signal frequencies.

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

a first terminal of the third rf switch S3 is connected to the second terminal of the main inductor Ls, a second terminal of the third rf switch S3 is connected to the first terminal of the second capacitor Cp2, a second terminal of the second capacitor Cp2 is connected to the first terminal of the second inductor Lp2, and a second terminal 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 closed, the fourth rf switch S4 is opened, 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 rf switch S3 and the fourth rf switch S4 are both good rf switches using RFsoi technology of 60nm technology.

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

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

It can be seen that, the embodiment of the utility model provides a low noise amplifier circuit, through set up band elimination filter 1 between signal receiving terminal and low noise amplifier, can help filtering the signal of specific frequency, wherein, because band elimination filter 1 has a plurality of changeable filtering modules, and different filtering module syntonizations in different frequency or frequency range, the embodiment of the utility model provides a can avoid all adopting same filtering module to filter to all signals that remain to filter, and then, can provide the basis for selecting more suitable filtering module (for example, select resonant frequency and transmitter to send out frequency assorted filtering module), and then, can help improving the isolation of receiving side and transmitting side signal to help guaranteeing the linearity of signal.

In one embodiment, the frequency or frequency range represented by the first signal frequency is one half of the receiving frequency of the signal receiving end;

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

And further: when the transmitter transmits at half the reception frequency, the first rf switch S1 is closed, the second rf switch S2 is open, 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 receive frequency, the third rf switch S3 is closed, the fourth rf switch S4 is open, 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 in-band frequencies and adjust the noise and gain performance.

It can be seen that, the low-noise amplifying circuit provided by the present invention, since the transmission signal of a specific frequency (e.g. half or one third of the receiving frequency) is converted nonlinearly in the signal chain of the receiver, by selectively filtering, a basis can be provided for selecting a suitable resonance frequency (e.g. one half or one third of the receiving frequency), so as to avoid or reduce the conversion of the nonlinearity, and further ensure the linearity of the signal.

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

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

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

The mode of confirming signal emission frequency can be arbitrary, for example can confirm through reading the relevant working parameter of transmitter, thereby also can confirm through sampling to the transmission signal, and also can be artifical preset, no matter what kind of mode of adoption, all do not break away from the utility model discloses the scope of embodiment.

Further, controlling the first filtering module or the second filtering module to participate in filtering according to the signal emission frequency 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 selected to participate in filtering, so that the second filtering module does not participate 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 at the moment, the first filtering module does not participate in filtering because the first filtering module and the second filtering module are selected to participate in filtering.

Specifically, referring to fig. 5, the control module 3 is respectively 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 filtering module participating in filtering by controlling on/off of the first rf switch S1, the second rf switch S2, the third rf switch S3 and the fourth rf switch S4.

In addition, the control functions of the switches may be implemented by circuit hardware of the control module, or by the cooperation of the circuit hardware and software, or by software.

In one embodiment, referring to fig. 6, the band-stop 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 one embodiment, referring to fig. 6, the band elimination 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 rf switch S5 and the sixth rf switch S6 are excellent rf switches using RFsoi technology of 60nm technology.

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

When the band-stop filter 1 is not required to participate in the filtering, the fifth radio frequency switch S5 is closed and the sixth radio frequency switch S6 is opened. It can be seen that the fifth radio frequency switch S5 and the sixth radio frequency switch S6 can make the band elimination filter 1 not work when not needing filtering, reduce the influence of the band elimination filter 1 on the system when reducing the power consumption, have the advantage that the insertion loss is low under the off state, the decay is good under the on state, and then, can reduce the power consumption of the system when guaranteeing the isolation degree and the linearity of the circuit.

In one embodiment, referring to fig. 8, the control module 13 is further connected to a control terminal of the fifth rf switch S5, and is configured to: controlling the fifth radio frequency switch S5 to close when not required to participate in filtering with the band stop filter 1.

In one embodiment, referring to fig. 8, the control module 13 is further connected to a control terminal of the sixth rf switch S6, and is configured to: and controlling the sixth radio frequency switch S6 to be switched off when the filtering is not required to be participated by the band elimination filter 1.

The judgment result of whether the band-stop filter 1 is not needed to participate in the filtering may be judged automatically by the control module 13 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

5.925GHz, under the signal frequency, the specific scheme can restrain all TX signals possibly interfering the working frequency band of 5.15GHz to 5.925GHz, and experimental data prove that when the band-stop filter 1 is conducted, the noise coefficient is 1.9 dB; when the band elimination filter 1 is not conducted, the noise coefficient is 1.3dB, and therefore the system has good isolation degree no matter whether the band elimination 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 finite number of experiments and/or theoretical derivation.

Therefore, because the embodiment of the utility model provides a selection to the filtering module is made based on the frequency of the signal that the transmitter sent, can be favorable to making the filtering module of selecting can accurately match in the signal that probably produces the interference to effectively improve the isolation and the linearity of signal.

The embodiment of the present invention provides a control method for a low noise amplifier circuit, which can be applied to the control modules shown in fig. 5 and fig. 8, and the related technical terms, optional implementation manners, and technical effects can be understood with reference to the explanation of the related low noise amplifier and low noise amplifier circuit in the foregoing.

As mentioned above, the low noise amplifying circuit further includes a control module, the control module is respectively connected to the first filtering module and the second filtering module, 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 signaling frequency matches the first signal frequency;

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

if the determination result in the step S721 is no, the step S723 may be implemented: whether the signaling frequency matches the second signal frequency;

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

The sequence of each step is not limited to the above example, 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 is executed, the scope of the embodiment of the present invention is not deviated.

In one embodiment, as mentioned above, the low noise amplification circuit may further include a fifth rf 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 amplification circuit may further include a sixth rf 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 required to participate in filtering;

if the determination result in the step S73 is no, the steps S74 and S75 may be respectively performed:

s74: controlling the fifth RF switch to close

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

The sequence of steps S74 and S75 may be as shown in fig. 11, or step S75 may be performed first and then step S74 may be performed, or they may be performed in parallel.

In one embodiment, referring to fig. 12, the low noise amplifier 2 may include: the cascade input module 21, the load module 23 and the 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 Lcd 3;

the gate of the first transistor M1 is directly or indirectly connected to the signal input terminal 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,

a 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, a 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, a second end of the second energy storage inductor Lcd2 is connected to a first end of the third energy storage inductor Lcd3, and a 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 side 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, other variations using other transistors (e.g., transistors) to achieve similar functionality are not excluded.

Therefore, the low noise amplifier provided by the above 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 power supply from being accessed from the outside, and reducing the overall power consumption of the low noise amplifier.

Specifically, a 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, a 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, a first end of the second energy storage inductor Lcd2 is connected to the drain of the second transistor M2, a second end of the second energy storage inductor Lcd2 is connected to a first end of the third energy storage inductor Lcd3, and a 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 inductor is a gm-boost energy storage inductor.

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

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

In addition, for the common single-ended cascode structure (cascode structure) and the low noise amplifier with capacitive voltage divider, the embodiment of the present invention can facilitate the implementation of 50-ohm optimal impedance matching for a broadband.

In one embodiment, the output side current of the current multiplexing module 22 is positively correlated with the input side current of the current multiplexing module 22, and can be understood as follows: the current multiplexing module 22 increases the output side current 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, so as 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, the conversion scheme of using other transistors (such as a triode) to implement 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 that of the second transistor M2, and the parasitic capacitance of the third transistor M3 has a smaller capacitance than that of the second transistor M2.

As can be seen, in the low noise amplifier according to the above embodiment, since the transistor in the current multiplexing module 22 has a small size and the parasitic capacitance thereof has a small capacity, the attenuation of the voltage gain can be reduced, and the loss of the in-band gain can be reduced.

In one embodiment, the current multiplexing module further includes a dc 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 dc blocking capacitor Ccd.

In one embodiment, the system further comprises a bias voltage module 24 and a source degeneration inductor Ls;

the source of the first transistor M1 is connected to the first terminal of the source degeneration inductor Ls, the second terminal of the source degeneration inductor 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 terminal of the source degeneration inductor 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 mirror, in the circuit shown in the figure, only the fourth transistor M4 is illustrated, and the specific circuit structure thereof can be understood by referring to a current mirror that is already existing or improved in the art, which is described in detail herein.

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

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

In one embodiment, the apparatus 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 filter resistor Rbcg and a filter capacitor Ccg; a first end of the filter resistor Rbcg is connected to the power supply port Vcg, a second end of the filter resistor Rbcg is connected to the gate of the second transistor M2, a 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 method further comprises matching the inductor Lg with the input capacitor Cin;

a first end of the matching inductor Lg is connected to the signal input end Vlna, a second end of the matching inductor Lg is connected to a first end of the input capacitor Cin, and a 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 in filtering. The matching inductor Lg, the first transistor M1 and its parasitic capacitance form a second-stage resonant network with the source degeneration inductor LS described above.

In one example, the source degeneration inductor Ls and the matching inductor Lg may both use SOI technology with a low resistance aluminum layer and two copper layers to achieve a high quality factor on-chip inductor. The embodiment of the utility model provides a do not exclude the implementation mode that adopts other inductances yet.

The utility model also provides an electronic equipment, including the low noise amplifier circuit of above arbitrary optional.

The electronic device may be any electronic device with a communication function, and for example, may be a mobile phone, a tablet computer, a smart wearable device, a network device, an in-vehicle device, and other communication-dedicated or non-communication-dedicated devices.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (11)

1. The low-noise amplification circuit applied to the ULCA is characterized by comprising a band-elimination filter and a low-noise amplifier, wherein the band-elimination 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 a signal receiving end of a receiver, and the second end of the main inductor is connected with the input end of the low-noise amplifier; the first end of the first filtering module is connected to the first end of the main inductor, and the first end of the second filtering module is connected to the second end of the main inductor;

the first filtering module is configured to: being resonant with the primary inductance at a first signal frequency when participating in filtering;

the second filtering module is configured to: being resonant with the primary inductor at a second signal frequency when participating in filtering;

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

2. The low noise amplification circuit for ULCA of claim 1, wherein said first filtering module comprises at least one first filtering resonant circuit, said first filtering resonant circuit comprising a first RF switch, a first capacitor, a first inductor and a second RF switch;

the first end of the first radio frequency switch is connected to the first end of the main inductor, the second end of the first radio frequency switch is connected to the first end of the first capacitor, the second end of the first capacitor is connected to 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 frequency.

3. The low noise amplification circuit for ULCA of claim 1, wherein said second filtering module comprises at least one second filtering resonant circuit, said second filtering 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 to the second end of the main inductor, the second end of the third radio frequency switch is connected to the first end of the second capacitor, the second end of the second capacitor is connected to 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 at the second signal frequency.

4. The low noise amplification circuit for ULCA of claim 1, wherein said first signal frequency is characterized by a frequency or frequency range that is one-half of a reception frequency of said signal receiving terminal.

5. A low noise amplification circuit for use in ULCA as claimed in claim 1, wherein said second signal frequency is characterized by a frequency or frequency range of one third of a reception frequency of said signal receiving terminal.

6. The low noise amplifier circuit applied to ULCA of any of claims 1 to 5, further comprising a control module connecting said first filtering module and said second filtering module, respectively.

7. The low noise amplifier circuit for ULCA of any of claims 1 to 5, further comprising a fifth RF switch;

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

8. The low noise amplification circuit for ULCA of claim 7, further comprising a control module, said control module being connected to a control terminal of said fifth RF switch.

9. The low noise amplifier circuit for ULCA of any of claims 1 to 5, further comprising a sixth RF 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.

10. The low noise amplification circuit for ULCA of claim 9, further comprising a control module, said control module being connected to a control terminal of said sixth RF switch.

11. An electronic device comprising the low-noise amplification circuit according to any one of claims 1 to 10.

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