CN108649988A - Wireless communication system receiving circuit and rf signal reception method - Google Patents
Wireless communication system receiving circuit and rf signal reception method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
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Abstract
A kind of wireless communication system receiving circuit and rf signal reception method.Rf signal reception method is applied to a wireless communication system receiving circuit, and amplifies a radiofrequency signal based on an analog domain gain.The radiofrequency signal includes a data-signal and an interference signal.This method includes：The radiofrequency signal is amplified to generate an amplified radiofrequency signal based on one first gain with a low-noise amplifier, first gain is related with one first bias voltage signal；The amplified radiofrequency signal is detected in radio frequency band to generate a control signal of the power of the corresponding amplified radiofrequency signal, which is an analog signal；First bias voltage signal is provided to the low-noise amplifier according to the control signal；The frequency reducing amplified radiofrequency signal is to generate an intermediate frequency or fundamental frequency signal；And the intermediate frequency or fundamental frequency signal are filtered, to filter out the interference signal and obtain the data-signal.
Description
Technical field
The present invention relates to wireless communications, especially with respect to the recipient of wireless communication system receiving circuit and radiofrequency signal
Method.
Background technology
The receiving terminal of one wireless communication system often utilizes low-noise amplifier (Low Noise Amplifier, LNA)
The received radiofrequency signal of amplification.The gain (gain) of low-noise amplifier is related to the noise figure (Noise of system
Figure, NF) and the linearity (Linearity).In general, preferable noise figure, which represents system, preferable sensitivity,
And the higher linearity represents system can more accurately accept radiofrequency signal.
When improving the gain of low-noise amplifier, the noise figure of system can improve, however the linearity can then be deteriorated；Phase
Anti-, when reducing the gain of low-noise amplifier, the linearity of system can improve, and noise figure can then be deteriorated.Therefore exist
It is often necessary to make trade-offs between the two when the gain for determining low-noise amplifier.The prior art is proposed at fundamental frequency (baseband)
In circuit in a manner of digital signal feedback control low-noise amplifier gain, the disadvantage is that digital controlled signal can not be continuous
And the gain of low-noise amplifier is adaptively controlled, such as in the digital controlled signal of continuous two rank, one can cause system
The linearity it is too low (distorted signals may be caused), another one has the acceptable linearity, but noise figure can be caused to become
Poor (sensitivity may be caused to be lower).So discontinuous gain control makes system be unable to reach a preferable working environment.
Invention content
In view of the deficiency of prior art, one of present invention is designed to provide a kind of wireless communication system receiving circuit and penetrates
Frequency signal acceptance method, to improve the linearity and noise figure.
A kind of wireless communication system receiving circuit of present disclosure, for receiving a radiofrequency signal and being increased based on an analog domain
Benefit amplifies the radiofrequency signal, which includes a data-signal and an interference signal, the wireless communication system receiving circuit
Including：One low-noise amplifier generates one first gain according to one first bias voltage signal, and amplifies the radio frequency with first gain
Signal is to generate an amplified radiofrequency signal；One RF power sensing circuit couples the output end of the low-noise amplifier, uses
To detect the amplified radiofrequency signal in radio frequency band to generate a control of the power of the corresponding amplified radiofrequency signal
Signal, the control signal are an analog signal；One low-noise amplifier bias circuit couples the low-noise amplifier and the radio frequency
Power-sensing circuit, for providing first bias voltage signal to the low-noise amplifier according to the control signal；One frequency mixer, coupling
The low-noise amplifier is connect, the amplified radiofrequency signal is to generate an intermediate frequency or fundamental frequency signal for frequency reducing；And one filtering
Circuit couples the frequency mixer, with filtering out the interference signal in the intermediate frequency or fundamental frequency signal, and exports the data-signal.
The present invention separately discloses a kind of wireless communication system receiving circuit, for receiving a radiofrequency signal and being based on an analog domain
The radiofrequency signal is amplified in gain, which includes a data-signal and an interference signal, which receives electricity
Road includes：One low-noise amplifier amplifies the radiofrequency signal to generate an amplified radiofrequency signal with one first gain；One penetrates
Frequency power-sensing circuit couples the output end of the low-noise amplifier, for detecting the amplified radio frequency letter in radio frequency band
Number to generate a control signal of the power of the corresponding amplified radiofrequency signal, which is an analog signal；One is mixed
Frequency device couples the low-noise amplifier, is used for generating one second gain according to a bias voltage signal, and will according to a reference clock
The amplified radiofrequency signal frequency reducing amplifies the amplified radiofrequency signal at an intermediate frequency or fundamental frequency signal, and with second gain
Or the intermediate frequency or fundamental frequency signal；One frequency mixer bias circuit couples the frequency mixer and the RF power sensing circuit, is used for basis
The control signal provides the bias voltage signal to the frequency mixer；And a filter circuit, couple the frequency mixer, with from the intermediate frequency or
The interference signal is filtered out in fundamental frequency signal, and exports the data-signal.The analog domain gain substantially with first gain and should
The product of second gain is proportional.
The present invention separately discloses a kind of rf signal reception method, is applied to a wireless communication system receiving circuit, is based on one
A radiofrequency signal is amplified in analog domain gain, which includes a data-signal and an interference signal, this method include：With one
Low-noise amplifier amplifies the radiofrequency signal to generate an amplified radiofrequency signal based on one first gain, first gain with
One first bias voltage signal is related；The amplified radiofrequency signal, which is detected, in radio frequency band is believed with generating the corresponding amplified radio frequency
Number power one control signal, the control signal be an analog signal；First bias voltage signal is provided according to the control signal
To the low-noise amplifier；The frequency reducing amplified radiofrequency signal is to generate an intermediate frequency or fundamental frequency signal；And filter the intermediate frequency
Or fundamental frequency signal, to filter out the interference signal and obtain the data-signal.
The present invention separately discloses a kind of rf signal reception method, is applied to a wireless communication system receiving terminal, is based on a mould
A radiofrequency signal is amplified in near-field gain, which includes a data-signal and an interference signal, this method include：It is low with one
Noise amplifier amplifies the radiofrequency signal to generate an amplified radiofrequency signal based on one first gain；It is detected in radio frequency band
To generate a control signal of the power of the corresponding amplified radiofrequency signal, which is the amplified radiofrequency signal
One analog signal；The frequency reducing amplified radiofrequency signal is to generate an intermediate frequency or fundamental frequency signal；Amplify this with one second gain to put
Radiofrequency signal or the intermediate frequency or fundamental frequency signal, second gain after big is related with a bias voltage signal；It is produced according to the control signal
The raw bias voltage signal；And the intermediate frequency or fundamental frequency signal are filtered, to filter out the interference signal and obtain the data-signal.The simulation
Domain gain is substantially proportional to first gain and the product of second gain.
Adjust to the wireless communication system receiving circuit and the rf signal reception method property of can adapt to and continuity of the present invention
Whole gain.Compared to traditional technology, the continuous adjust gain of present invention energy, therefore the operating environment that can more adapt at that time is penetrated to receive
Frequency signal.
Feature, implementation and effect for the present invention, hereby schema being coordinated to make embodiment, detailed description are as follows.
Description of the drawings
[Fig. 1] is the functional-block diagram of an embodiment of wireless communication system receiving circuit of the present invention；
[Fig. 2] is the circuit diagram of an embodiment of RF power sensing circuit 140；
[Fig. 3] is the circuit diagram of an embodiment of LNA bias circuits 130；
[Fig. 4] is the circuit diagram of an embodiment of low-noise amplifier 120；
[Fig. 5] is the functional-block diagram of another embodiment of wireless communication system receiving circuit of the present invention；
[Fig. 6] is the functional-block diagram of another embodiment of wireless communication system receiving circuit of the present invention；
[Fig. 7] is the flow chart of a wherein embodiment for the rf signal reception method of the present invention；And
[Fig. 8] is the flow chart of another embodiment of the rf signal reception method of the present invention.
Specific implementation mode
The technical terms of following description refer to the idiom of the art, if this specification is to part term
Be illustrated or define, the explanation of part term system be subject to this specification explanation or define.
The disclosure content of the present invention includes wireless communication system receiving circuit and rf signal reception method.Due to the present invention
The subelement that includes of wireless communication system receiving circuit it is independent for may be well known elements, therefore do not influencing the dress
Under the premise of abundant disclosure and the exploitativeness of setting invention, illustrate that the details of well known elements will be omitted below.In addition,
Some or all of the rf signal reception method of present invention flow can be the form of software and/or firmware, and can pass through
The wireless communication system receiving circuit of the present invention or its equivalent device execute, in the abundant disclosure for not influencing this method invention and
Under the premise of exploitativeness, the explanation of following methods invention will focus on step content and non-hardware.
Fig. 1 is the functional-block diagram of an embodiment of wireless communication system receiving circuit of the present invention.Low-noise amplifier 120
Radiofrequency signal is received by antenna 110.Radiofrequency signal includes interference signal and data carrying data-signal.Low noise amplification
Device 120 amplifies radiofrequency signal according to a gain, and generates amplified radiofrequency signal.Frequency mixer 150 is produced according to reference clock
The amplified radiofrequency signal of reference clock frequency reducing that raw circuit 160 is exported, and generate corresponding intermediate frequency (Intermediate
Frequency, IF) or fundamental frequency signal.After filter circuit 170 filters out the interference signal in this intermediate frequency or fundamental frequency signal, system is generated
Data-signal needed for system.This data-signal is via carrying out solution modulation, decoding etc. after the circuit conversion to numeric field of rear class
Processing.Reference clock generation circuit 160 is, for example, a rf frequency synthesizer (RF frequency synthesizer).
RF power sensing circuit 140 is coupled to the output end of low-noise amplifier 120, detects low-noise amplifier
The power of 120 radiofrequency signals exported, and generate control signal (such as voltage or the electric current of the simulation of the corresponding watt level
Signal).LNA bias circuits 130 are put according to this control signal bias low-noise amplifier 120 with adaptively adjusting low noise
The gain of big device 120.Because the control signal system of LNA bias circuits 130 in order to control is an analog signal, so the present invention is actually
Can according to radiofrequency signal power continuity adjust the gain of low-noise amplifier 120.The output of LNA bias circuits 130
Also it is the voltage or current signal of a simulation.
When RF power sensing circuit 140 be coupled to frequency mixer 150 output end rather than low-noise amplifier 120 it is defeated
When outlet, intermediate frequency or the power of fundamental frequency signal rather than the power of radiofrequency signal detect in 140 system of RF power sensing circuit.At this time
Generated control signal is still analog signal, so the control of the yield value of low-noise amplifier 120 is still successional.Phase
Compared with the power for measuring radiofrequency signal, measuring the power of intermediate frequency or fundamental frequency signal can cause because the frequency of signal is relatively low
The reaction time (response time) of system call interception gain also becomes longer.Furthermore when 140 coupling of RF power sensing circuit
When being connected to the output end of frequency mixer 150, the operation of RF power sensing circuit 140 is more easier to the parasitism electricity by filter circuit 170
Holding influences.Big parasitic capacitance can equally tie down the reaction time of system call interception gain, if however in order to shorten the reaction time
And high current, then it can make system more power consumption.Therefore by detecting power (rather than the work(of intermediate frequency or fundamental frequency signal of radiofrequency signal
Rate), wireless communication system receiving terminal has better circuit performance.Frequency mixer 150 is, for example, the frequency mixer of a passive type, no
Has the function of amplified signal.
Fig. 2 is the circuit diagram of an embodiment of RF power sensing circuit 140.RF power sensing circuit 140 includes electricity
Stream source 260 and transistor 210~250 (such as metal-oxide half field effect transistor MOSFET, but not limited to this).Transistor 220 and
230 gate is received radiofrequency signal Vi and (is indicated Vin and Vip with differential wave in figure, but non-limiting the present invention, this hair
Bright RF power sensing circuit 140 can also be applied to non-differential signals).Larger Vi makes the conducting of transistor 220 and 230
Electric current increases, therefore the electric current for flowing through transistor 210 (being used herein as resistance) also increases therewith, and then leads to node Nb's
Voltage declines, and the conducting electric current of transistor 240 is made to increase.When herein the electric current for flowing through transistor 250 (being used as resistance) increases
Added-time, the control signal V that RF power sensing circuit 140 is exportedcVoltage also and then become larger.
Fig. 3 is the circuit diagram of an embodiment of LNA bias circuits 130.LNA bias circuits 130 include current source 310 and crystalline substance
Body pipe 320,330.As control signal VcVoltage increase, the electric current for flowing through transistor 320 increases, causes to flow through transistor therewith
The electric current of 330 (being used herein as resistance) is reduced, therefore the bias V that LNA bias circuits 130 exportbJust decline therewith.
Fig. 4 is the circuit diagram of an embodiment of low-noise amplifier 120.Transistor 420,430 concatenate after again respectively via
Inductance 410,440 is connected to the high potential VDD and low potential (such as ground connection) of system.The gate of transistor 420 couples bias plasma
Press VBC.Radiofrequency signal is coupled to the gate of transistor 430 via capacitance 470 and inductance 450.The output of LNA bias circuits 130
(i.e. bias Vb) gate of transistor 430 is coupled to by resistance 460 and inductance 450.When the gate-source of transistor 430 is inclined
Pressure (is biased against V in the present embodimentbControl) decline when, mutual conductance (Transconductance) gm of transistor 430 becomes smaller, and makes low
The gain of noise amplifier 120 declines.However work as bias VbWhen increase, the mutual conductance of transistor 430 becomes larger, and makes low-noise amplifier
120 gain rises.
Fig. 5 is the functional-block diagram of another embodiment of wireless communication system receiving circuit of the present invention.Frequency mixer 510 can be with
The group for being active mixer or passive type frequency mixer and turning impedance amplifier (transimpedance amplifier, TIA)
It closes, and can be according to gain amplified signal.Passive type frequency mixer and the combination system for turning impedance amplifier provide increasing by turning impedance amplifier
Benefit.In detail, the major function of frequency mixer 510 is still the radiofrequency signal that is exported of frequency reducing low-noise amplifier 120 to generate one
Intermediate frequency or fundamental frequency signal, but frequency mixer 510 also has the function of amplified signal, can amplify the radiofrequency signal or the intermediate frequency or base
Frequency signal.The gain of frequency mixer 510 is controlled by frequency mixer bias circuit 180.The one of which implementation of frequency mixer bias circuit 180
Mode is as shown in figure 3, the control signal V exported also according to RF power sensing circuit 140cAdjust bias VbSize, in turn
Change the gain of frequency mixer 510.It is compared with the embodiment of Fig. 1, the increasing of frequency mixer 510 is adjusted according to the watt level of radiofrequency signal
Benefit can equally be such that radio-frequency front-end (RF front-end) is adapted in the equivalent gain (calling analog domain gain in the following text) of analog domain
Adjust to property and continuity.The product of the gain of analog domain gain and low-noise amplifier 120 and the gain of frequency mixer 510 at than
Example.In the present embodiment, the gain of low-noise amplifier 120 is non-adjustable, though or it is adjustable not with the work(of radiofrequency signal
Rate size adjusts with doing adaptability and continuity.
Fig. 6 is the functional-block diagram of another embodiment of wireless communication system receiving circuit of the present invention.In the present embodiment,
The gain of low-noise amplifier 120 and the gain of frequency mixer 510 are all as the watt level of radiofrequency signal does adaptability and continuous
It adjusts to property, therefore the linearity of wireless communication system and noise figure can be further improved.
In addition to wireless communication system receiving circuit above-mentioned, the present invention also correspondingly discloses a kind of radiofrequency signal and connects
Receiving method, is applied to the receiving terminal of wireless communication system, adapting to property and continuity ground adjust gain.This method is wireless by preceding taking off
Communication system receiving circuit or its equivalent device execute.This rf signal reception method system is based on an analog domain gain in analog domain
Amplify the radiofrequency signal, and adjusts in analog domain continuity and adaptively the analog domain gain.The radiofrequency signal includes
One data-signal and an interference signal.Fig. 7 is the flow chart of this method wherein embodiment, is comprised the steps of：
Step S710：After amplifying the radiofrequency signal based on one first gain to generate an amplification using a low-noise amplifier
Radiofrequency signal.First gain is controlled by one first bias voltage signal；
Step S720：The amplified radiofrequency signal is detected in radio frequency band to generate the corresponding amplified radiofrequency signal
Power one control signal.The power of the output signal of low-noise amplifier directly detects in this step system, and non-detection frequency reducing
Signal afterwards, so this step system operates in radio frequency band, and not operation is in the intermediate frequency or fundamental frequency frequency range compared with low frequency.Compared to
The power of intermediate frequency or fundamental frequency frequency range detection signal, this step can obtain more instant power detection result.And control signal
System is an analog signal；
Step S730：First bias voltage signal is provided to the low-noise amplifier according to the control signal.Above-mentioned first
Bias voltage signal system generates according to the control signal, such as the work(that the first bias voltage signal can indirectly with amplified radiofrequency signal
Rate is directly proportional or inverse relation.First bias voltage signal is also an analog signal；
Step S740：The frequency reducing amplified radiofrequency signal is to generate an intermediate frequency or fundamental frequency signal.This step can be such as
Frequency redution operation is carried out based on the operating principle of frequency mixer；
Step S750：Amplify the amplified radiofrequency signal or the intermediate frequency or fundamental frequency signal with one second gain.In addition in
Except low-noise amplifier above-mentioned amplification radiofrequency signal, the present invention also optionally in analog circuit elsewhere again
Secondary amplification radiofrequency signal.Second gain is controlled by one second bias voltage signal；
Step S760：Second bias voltage signal is generated according to the control signal.Second bias voltage signal system believes according to the control
It number generates, such as the second bias voltage signal can or inverse relation directly proportional to the power of amplified radiofrequency signal indirectly.The
Two bias voltage signals are also an analog signal；And
Step S770：The intermediate frequency or fundamental frequency signal are filtered, to filter out the interference signal and obtain the data-signal.
Above-mentioned step S750 and S760 is the step of selectivity.That is, radiofrequency signal after low-noise amplifier amplifies extremely
Filtering is completed, and can only pass through primary amplification (skipping over step S750 and S760), or (execute step by amplification twice
S750 and S760).In the case of primary amplification, the analog domain gain that radiofrequency signal is undergone is proportional to the first gain；
In the case of amplifying twice, analog domain gain is proportional to the product of the first gain and the second gain.That is analog domain increases
Benefit system does continuity according to the power of radiofrequency signal and adaptively adjusts, therefore can arrive and more meet operating environment at that time
Gain, to obtain better balance in the linearity and noise figure.
Fig. 8 is the flow chart of another embodiment of the rf signal reception method of the present invention, is comprised the steps of：
Step S810：After amplifying the radiofrequency signal based on one first gain to generate an amplification using a low-noise amplifier
Radiofrequency signal.The watt level that first gain does not correspond to radiofrequency signal adjusts, such as can be certain value；
Step S820：The amplified radiofrequency signal is detected in radio frequency band to generate the corresponding amplified radiofrequency signal
Power one control signal.This step is similar to step S720, and likewise, control signal system is an analog signal；
Step S830：The frequency reducing amplified radiofrequency signal is to generate an intermediate frequency or fundamental frequency signal.This step and step
S740 is similar, and so it will not be repeated；
Step S840：Amplify the amplified radiofrequency signal or the intermediate frequency or fundamental frequency signal with one second gain, this second
Gain is controlled by a bias voltage signal, which is also an analog signal；
Step S850：The bias voltage signal is generated according to the control signal.Such as bias voltage signal can indirectly with after amplification
Radiofrequency signal power is directly proportional or inverse relation.Bias voltage signal is also an analog signal；And
Step S860：The intermediate frequency or fundamental frequency signal are filtered, to filter out the interference signal and obtain the data-signal.
Though the method disclosed by Fig. 8 not in low-noise amplifier according to the power adjustment gain of radiofrequency signal, but still can be
Other operational phases are according to the power adjustment gain (such as after frequency reducing) of radiofrequency signal, so whole analog domain gain is still
It is adjusted according to the power of radiofrequency signal.And control signal and bias voltage signal are all analog signal, make gain is adjusted to continuous
Property and adaptability.Analog domain gain is substantially proportional to the product of the first gain and the second gain.
Present invention could apply to wireless network (including but not limited to WiFi), bluetooth, global positioning system (GPS), adjust
Frequently the receiving terminal of the systems such as (Frequency modulation, FM), mobile communication (such as GSM, 3G, LTE), but not as
Limit.
Due to the art, tool usually intellectual can be understood by the disclosure content of the device inventions of Fig. 1 to Fig. 6
Therefore the implementation detail of the method invention of Fig. 7 and Fig. 8 and variation to avoid superfluous text, are wanted in the disclosure for not influencing this method invention
Ask and exploitativeness under the premise of, the explanation of repetition is omitted herein.It is taken off in icon before note that, the shape of element, ruler
Sequence of very little, ratio and step etc. is only to illustrate, and is to understand the present invention for the art tool usually intellectual to be used, non-
To limit the present invention.
Although embodiments of the present invention are as described above, however these embodiments are not used for limiting the present invention, this technology neck
Domain tool usually intellectual can express according to the present invention or implicit content imposes variation to the technical characteristic of the present invention, it is all this
Many variations may belong to the sought patent protection scope of the present invention, and in other words, the scope of patent protection of the present invention must regard
Subject to the claim institute defender of this specification.
【Symbol description】
110 antennas
120 low-noise amplifiers
130 LNA bias circuits
140 RF power sensing circuits
150 frequency mixers
160 reference clock generation circuits
170 filter circuits
180 frequency mixer bias circuits
210~250,320~330,420~430 transistors
260,310 current source
410,440,450 inductance
460 resistance
470 capacitances
510 active mixers
S710~S770, S810~S860 steps.
Claims (8)
1. a kind of wireless communication system receiving circuit, for receiving a radiofrequency signal and amplifying the radio frequency based on an analog domain gain
Signal, the radiofrequency signal include a data-signal and an interference signal, which includes：
One low-noise amplifier generates one first gain according to one first bias voltage signal, and amplifies the radio frequency with first gain
Signal is to generate an amplified radiofrequency signal；
One RF power sensing circuit couples the output end of the low-noise amplifier, for after radio frequency band detects the amplification
Radiofrequency signal to generate a control signal of the power of the corresponding amplified radiofrequency signal, which is that a simulation is believed
Number；
One low-noise amplifier bias circuit couples the low-noise amplifier and the RF power sensing circuit, and being used for basis should
Control signal provides first bias voltage signal to the low-noise amplifier；
One frequency mixer couples the low-noise amplifier, and for frequency reducing, the amplified radiofrequency signal is to generate an intermediate frequency or fundamental frequency
Signal；And
One filter circuit couples the frequency mixer, with filtering out the interference signal in the intermediate frequency or fundamental frequency signal, and exports the number
It is believed that number.
2. wireless communication system receiving circuit according to claim 1, the wherein frequency mixer are according to one second bias voltage signal
One second gain is generated, and the amplified radiofrequency signal or the intermediate frequency or fundamental frequency signal are amplified with second gain, this is wireless
Communication system receiving circuit also includes：
One frequency mixer bias circuit couples the frequency mixer and the RF power sensing circuit, is used for being provided according to the control signal
Second bias voltage signal is to the frequency mixer；
Wherein, the analog domain gain is proportional to first gain and the product of second gain.
3. wireless communication system receiving circuit according to claim 1, wherein the frequency mixer is without enlarging function
One passive type frequency mixer, and the analog domain gain is proportional to first gain.
4. a kind of wireless communication system receiving circuit, for receiving a radiofrequency signal and amplifying the radio frequency based on an analog domain gain
Signal, the radiofrequency signal include a data-signal and an interference signal, which includes：
One low-noise amplifier amplifies the radiofrequency signal to generate an amplified radiofrequency signal with one first gain；
One RF power sensing circuit couples the output end of the low-noise amplifier, for after radio frequency band detects the amplification
Radiofrequency signal to generate a control signal of the power of the corresponding amplified radiofrequency signal, which is that a simulation is believed
Number；
One frequency mixer couples the low-noise amplifier, is used for generating one second gain according to a bias voltage signal, and according to a ginseng
Clock is examined by the amplified radiofrequency signal frequency reducing into an intermediate frequency or fundamental frequency signal, and it is amplified with second gain to amplify this
Radiofrequency signal or the intermediate frequency or fundamental frequency signal；
One frequency mixer bias circuit couples the frequency mixer and the RF power sensing circuit, is used for being provided according to the control signal
The bias voltage signal is to the frequency mixer；And
One filter circuit couples the frequency mixer, with filtering out the interference signal in the intermediate frequency or fundamental frequency signal, and exports the number
It is believed that number；
Wherein, the analog domain gain is proportional to first gain and the product of second gain.
5. a kind of rf signal reception method is applied to a wireless communication system receiving circuit, amplified based on an analog domain gain
One radiofrequency signal, the radiofrequency signal include a data-signal and an interference signal, which includes：
The radiofrequency signal is amplified to generate an amplified radiofrequency signal based on one first gain with a low-noise amplifier, this
One gain is related with one first bias voltage signal；
The amplified radiofrequency signal is detected in radio frequency band to generate a control of the power of the corresponding amplified radiofrequency signal
Signal processed, the control signal are an analog signal；
First bias voltage signal is provided to the low-noise amplifier according to the control signal；
The frequency reducing amplified radiofrequency signal is to generate an intermediate frequency or fundamental frequency signal；And
The intermediate frequency or fundamental frequency signal are filtered, to filter out the interference signal and obtain the data-signal.
6. rf signal reception method according to claim 5, also includes：
Amplify the amplified radiofrequency signal or the intermediate frequency or fundamental frequency signal with one second gain, second gain is inclined with one second
Press signal related；And
Second bias voltage signal is generated according to the control signal；
Wherein the analog domain gain is proportional to first gain and the product of second gain.
7. the rf signal reception method according to claim 5, wherein the analog domain gain and first gain at than
Example.
8. a kind of rf signal reception method is applied to a wireless communication system receiving terminal, amplify one based on an analog domain gain
Radiofrequency signal, the radiofrequency signal include a data-signal and an interference signal, which includes：
The radiofrequency signal is amplified to generate an amplified radiofrequency signal based on one first gain with a low-noise amplifier；
The amplified radiofrequency signal is detected in radio frequency band to generate a control of the power of the corresponding amplified radiofrequency signal
Signal processed, the control signal are an analog signal；
The frequency reducing amplified radiofrequency signal is to generate an intermediate frequency or fundamental frequency signal；
Amplify the amplified radiofrequency signal or the intermediate frequency or fundamental frequency signal with one second gain, which believes with a bias
It is number related；
The bias voltage signal is generated according to the control signal；And
The intermediate frequency or fundamental frequency signal are filtered, to filter out the interference signal and obtain the data-signal；
Wherein, the analog domain gain is proportional to first gain and the product of second gain.
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