CN103378870B - Communication device and radio frequency equalizer - Google Patents
Communication device and radio frequency equalizer Download PDFInfo
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- CN103378870B CN103378870B CN201210126432.8A CN201210126432A CN103378870B CN 103378870 B CN103378870 B CN 103378870B CN 201210126432 A CN201210126432 A CN 201210126432A CN 103378870 B CN103378870 B CN 103378870B
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Abstract
A kind of radio frequency equalizer, comprise be coupled to an input the first resistance, be coupled to the second resistance between the first resistance and an output, the first electric capacity, the first inductance, the first switch being coupled to input, the first electric capacity and the first inductance, the second switch being coupled to output, the first electric capacity and the first inductance, the second electric capacity, the second inductance and be coupled to the 3rd switch of the first resistance, the second resistance, the second electric capacity and the second inductance.First electric capacity or the first inductance are coupled to input according to a control signal selectivity by the first switch.First electric capacity or the first inductance are coupled to output according to control signal selectivity by second switch.Second electric capacity or the second inductance are coupled to a tie point of the first resistance and the second resistance by the 3rd switch according to control signal selectivity.
Description
Technical field
The invention relates to a kind of radio frequency equalizer, particularly about a kind of radio frequency equalizer compensating RF signal power flatness.
Background technology
Because mobile communcations system is in progress in recent years, it can provide various Communications service in the mode not being limited to user position, such as: voice service, data, services and Video service.General mobile communcations system is multiple access system, meaning can access this system for multidigit user and configure suitable wireless network resource to user simultaneously, and the multiple access technology that it uses includes: global system for mobile communications (Global System for Mobile communications, GSM), CDMA access system (Code Division Multiple Access, CDMA), WCDMA access system (Wideband Code Division Multiple Access, WCDMA), and Long Term Evolution (LongTerm Evolution, LTE) technology etc.In addition, advanced Long Term Evolution (LTE Advanced) is the reinforcement platemaking technology gone out according to Long Term Evolution (LTE) standard evolution.
In order to make a device for mobile communication can support multiple different mechanics of communication (such as, above-mentioned GSM, CDMA, WCDMA, LTE etc.), multi-modal device for mobile communication design becomes the market mainstream gradually.The frequency band used due to each mechanics of communication is not quite similar, and therefore multi-modal device for mobile communication must support enough wide frequency band range, such as, is extended to the frequency band range of 3 gigahertzs (GHz) by 0.7 gigahertz (GHz).
But, due to the characteristic of the electronic component in device for mobile communication, make under identical input power, device for mobile communication may be not quite similar for the radiofrequency signal power output after treatment of different frequency bands, and causes the uneven phenomenon of the power of radiofrequency signal.Fig. 1 a is the curve of display radio-frequency signal output power relative to frequency, this example successively decreased along with frequency increase for radio-frequency signal output power.Fig. 1 b be display radio-frequency signal output power relative to another curve of frequency, this is that radio-frequency signal output power increases along with frequency and the example that increases progressively, and wherein power increment is all one of uneven phenomenons of power output of radiofrequency signal with successively decreasing.
In order to the uneven phenomenon of the power output solving radiofrequency signal, the present invention proposes a kind of radio frequency equalizer, and it can the power output flatness of effective compensation radiofrequency signal.
Summary of the invention
According to one embodiment of the invention, a kind of communication device, comprises radio frequency transceiver, radio frequency equalizer, power amplifier and duplexer.Radio frequency transceiver is in order to produce multiple radiofrequency signal according to multiple fundamental frequency signal.Radio frequency equalizer is coupled to radio frequency transceiver, and in order to received RF signal, and produce multiple equalized radiofrequency signal according to a control signal, the frequency response wherein corresponding to radio frequency equalizer is responsive control signal and is adjusted.Power amplifier is coupled to radio frequency equalizer, in order to receive equalized radiofrequency signal, and amplifies equalized radiofrequency signal to produce multiple amplified radiofrequency signal.Duplexer is coupled to power amplifier, in order to receive amplified radiofrequency signal, and amplified radiofrequency signal is sent to an antenna.
According to another embodiment of the present invention, a kind of radio frequency equalizer, in order to receive multiple radiofrequency signal, and produce multiple equalized radiofrequency signal according to a control signal, comprise the first resistance, the second resistance, the first electric capacity, the first inductance, the first switch, second switch, the second electric capacity, the second inductance and the 3rd switch.First resistance is coupled to an input.Second resistance is coupled between the first resistance and an output.First switch is coupled to input, the first electric capacity and the first inductance, in order to the first electric capacity or the first inductance are coupled to input according to control signal selectivity.Second switch is coupled to output, the first electric capacity and the first inductance, in order to the first electric capacity or the first inductance are coupled to output according to control signal selectivity.3rd switch is coupled to the first resistance, the second resistance, the second electric capacity and the second inductance, in order to the second electric capacity or the second inductance to be coupled to according to control signal selectivity a tie point of the first resistance and the second resistance.
Accompanying drawing explanation
Fig. 1 a is the curve of display radio-frequency signal output power relative to frequency.
Fig. 1 b is display radio-frequency signal output power another curve relative to frequency.
Fig. 2 is the communication device calcspar of display according to one embodiment of the invention.
Fig. 3 shows communication device calcspar described according to another embodiment of the present invention.
Fig. 4 is the radio frequency equalizer circuit diagram of display according to one embodiment of the invention.
Fig. 5 a is the radio frequency equalizer equivalent circuit diagram when control signal have first state of display according to one embodiment of the invention.
Fig. 5 b is the radio frequency equalizer frequency response curve of display according to one embodiment of the invention.
Fig. 6 a is the radio frequency equalizer equivalent circuit diagram when control signal have second state of display according to one embodiment of the invention.
Fig. 6 b shows radio frequency equalizer frequency response curve described according to another embodiment of the present invention.
Fig. 7 is the power of amplified radiofrequency signal that exported by power amplifier after display compensating via radio frequency equalizer according to one embodiment of the invention curve relative to frequency.
[main element label declaration]
200,300 ~ communication device; 210,310 ~ fundamental frequency signal processing unit;
220,320 ~ radio frequency transceiver; 230,430,530,630 ~ radio frequency equalizer;
240 ~ power amplifier; 250 ~ directional coupler;
260 ~ duplexer; 270 ~ antenna;
280,380 ~ power detector; 290 ~ load;
501,502,601,602 ~ curve; C1, C2 ~ electric capacity;
Ctrl ~ control signal; IN ~ input;
L1, L2 ~ inductance; N1 ~ tie point;
OUT ~ output; R1, R2 ~ resistance;
RX ~ receiving port; S1, S2, S3 ~ switch;
TX ~ delivery port.
Embodiment
For making manufacture of the present invention, method of operation, target and advantage become apparent, several preferred embodiment cited below particularly, and coordinate institute's accompanying drawings, be described in detail below:
Embodiment:
Fig. 2 is the communication device calcspar of display according to one embodiment of the invention.Communication device 200 at least can comprise fundamental frequency signal processing unit 210, radio frequency transceiver 220, radio frequency equalizer 230, power amplifier 240, directional coupler 250, duplexer 260 and antenna 270.Fundamental frequency signal processing unit 210 is in order to process and to produce fundamental frequency signal.Fundamental frequency signal processing unit 210 can comprise multiple hardware unit to perform fundamental frequency signal process, comprise Analog-digital Converter (analog to digital conversion, ADC)/digital-to-analogue conversion (digital to analog conversion, DAC), gain (gain) adjustment, modulation and demodulation and coding/decoding etc.Fundamental frequency signal processing unit 210 also can comprise the delivery port TX transmitting up link (uplink) signal, and in order to a receiving port RX of receiving downlink (downlink) signal.
Radio frequency transceiver 220 is in order to process radiofrequency signal, it can the radiofrequency signal of receiving downlink, and radiofrequency signal is converted to fundamental frequency signal and processes further to transfer to fundamental frequency signal processing unit 210, or from the fundamental frequency signal of fundamental frequency signal processing unit 210 receiving uplink, and fundamental frequency signal is converted to radiofrequency signal to transmit.Radio frequency transceiver 220 also can comprise multiple hardware unit to perform the conversion of above-mentioned radio frequency, for example, radio frequency transceiver 220 can comprise a frequency mixer (mixer), in order to fundamental frequency signal to be multiplied by a carrier wave of the tranmitting frequency used in mobile communcations system of vibrating, wherein tranmitting frequency can be 900 megahertzes, 1800 megahertzes or 1900 megahertzes that GSM uses, or 900 megahertzes, 1900 megahertzes or 2100 megahertzes that UMTS uses, or 900 megahertzes, 2100 megahertzes or 2600 megahertzes that LTE uses, or depending on the standard of other wireless access techniques.
Radio frequency equalizer 230 is coupled to radio frequency transceiver 220, in order to receiving uplink radiofrequency signal, and produces equalized radiofrequency signal according to a control signal Ctrl and the uplink radio frequency signal received.According to one embodiment of the invention, control signal Ctrl produced by power detector 280, in order to adjust the frequency response corresponding to radio frequency equalizer 230, communication device 200 is made to compensate the uneven phenomenon of power output (following paragraph does more detailed introduction by for radio frequency equalizer 230 proposed by the invention) of radiofrequency signal by radio frequency equalizer 230.
Power amplifier 240 is coupled to radio frequency equalizer 230, in order to receive equalized radiofrequency signal, and amplifies equalized radiofrequency signal to produce amplified radiofrequency signal.Directional coupler 250 is coupled between power amplification 240 and duplexer 260, in order to radiofrequency signal amplified for major part is sent to duplexer 260, and by radio frequency signal feedback amplified for a part to power detector 280.Directional coupler 250 can comprise the output being coupled to power amplifier 240 an input port, be coupled to an output port of an input of duplexer 250, be coupled to a signal isolated port of load 290 (being generally the load of 50 ohm), and in order to feed back a coupling port of the amplified radiofrequency signal of a part.
Duplexer 260 is coupled to power amplifier 240 by directional coupler 250, in order to receive amplified radiofrequency signal, and amplified radiofrequency signal is sent to antenna 270.Amplified radiofrequency signal is sent in air finally by antenna.In the signal transacting of down link, the signal received from antenna 270 receiving downlink radiofrequency signal, and is sent to the receiving port RX of radio frequency transceiver 220 by duplexer 260.
According to one embodiment of the invention, power detector 280 in order to detect the power of amplified radiofrequency signal, and produces control signal Ctrl according to the power of amplified radiofrequency signal.It should be noted that power detector 280 can implementation be an independently device, or be integrated in radio frequency transceiver 220 as shown in Figure 2, the present invention is not limited to any one execution mode.In addition, when power detector 280 is integrated in radio frequency transceiver 220, power detector 280 can be an independently device or can be implemented by the element of radio frequency transceiver 220 inside (such as, a processor) equally, and the present invention is not limited to any one execution mode.
According to another embodiment of the present invention, power detector also can be integrated in fundamental frequency signal processing unit.Fig. 3 shows communication device calcspar described according to another embodiment of the present invention.Communication device 300 at least can comprise fundamental frequency signal processing unit 310, radio frequency transceiver 320, radio frequency equalizer 230, power amplifier 240, directional coupler 250, duplexer 260 and antenna 270.Fundamental frequency signal processing unit 310, radio frequency transceiver 320, radio frequency equalizer 230, power amplifier 240, directional coupler 250, duplexer 260 with reference to the related description of Fig. 2, and can repeat no more in this with the introduction of antenna 270.
In this embodiment, power detector 380 is integrated in fundamental frequency signal processing unit 310.Power detector 380 can be an independently device or can be implemented by the element of fundamental frequency signal processing unit 310 inside (such as, a processor) equally, and the present invention is not limited to any one execution mode.It should be noted that, in this embodiment, the amplified radiofrequency signal of the part fed back by directional coupler 250 directly can be sent to power detector 380 rate of doing work and detect, or first do frequency reducing conversion via radio frequency transceiver 320, be resent to power detector 380 rate of doing work to detect, and the present invention is not limited to any one execution mode.
According to one embodiment of the invention, power detector 280/380 is main in order to detect the flatness of power relative to a curve of frequency of amplified radiofrequency signal.For example, power detector 280/380 can record different frequency bands (such as, the different transmission band that different communication technologies uses or the different transmission band that same mechanics of communication uses or other) radiofrequency signal amplify via power amplifier 240 after watt level, with the curve (such as, curve Fig. 1 a and 1b figure shown in) of the power of the radiofrequency signal be amplified relative to frequency.Obtain power relative to the curve of frequency after, according to this curve, power detector 280/380 can judge that the power of amplified radiofrequency signal is whether along with frequency increases and increasing or decreasing, to produce corresponding control signal Ctrl to adjust the frequency response of radio frequency equalizer 230 further.
Fig. 4 is the radio frequency equalizer circuit diagram of display according to one embodiment of the invention.Radio frequency equalizer 430 can comprise resistance R1 and R2, electric capacity C1 and C2, inductance L 1 and L2 and switch S 1, S2 and S3.Resistance R1 and R2 coupled in series are between the input IN and output OUT of radio frequency equalizer 430.Switch S 1 be coupled to radio frequency equalizer 430 input IN, between electric capacity C1 and inductance L 1, in order to the one of electric capacity C1 or inductance L 1 is coupled to input IN according to control signal Ctrl selectivity.Switch S 2 be coupled to radio frequency equalizer 430 output OUT, between electric capacity C1 and inductance L 1, in order to the one of electric capacity C1 or inductance L 1 is coupled to output OUT according to control signal Ctrl selectivity.Therefore, the different conditions of responsive control signal Ctrl, the one of electric capacity C1 and inductance L 1 will and resistance R1 and R2 coupled in parallel between input IN and output OUT.Similarly, switch S 3 is coupled to resistance R1 and R2, between electric capacity C2 and inductance L 2, in order to electric capacity C2 or inductance L 2 to be coupled to according to control signal Ctrl selectivity a tie point N1 of resistance R1 and R2.
According to one embodiment of the invention, when power detector 280/380 judges that the power of amplified radiofrequency signal successively decreases along with frequency increase (such as, shown in the curve of Fig. 1 a), can produce and there is the first state (such as, one logic-high state or a logic low state) control signal Ctrl, in order to the handover operation of control switch S1, S2 and S3, so obtain the equivalent circuit diagram of radio frequency equalizer as shown in Figure 5 a-.
As shown in Figure 5 a, when control signal Ctrl has the first state, the equivalent electric circuit of radio frequency equalizer 530 comprises resistance R1 and R2, electric capacity C1 and inductance L 2.Electric capacity C1 and resistance R1 and R2 coupled in parallel are between input IN and output OUT, and inductance L 2 is coupled between the tie point N1 of resistance R1 and R2 and an end points (such as, an earth point).It should be noted that now inductance L 1 and input IN and output OUT are electrically insulated, and electric capacity C2 and resistance R1 and R2 is electrically insulated.
Fig. 5 b is the radio frequency equalizer frequency response curve of display according to one embodiment of the invention.The frequency response curve of frequency response curve shown in Fig. 5 b corresponding to the equivalent electric circuit of the radio frequency equalizer shown in Fig. 5 a.As shown in the figure, frequency response corresponding to the equivalent electric circuit of radio frequency equalizer 530 is insertion loss along with the frequency of radiofrequency signal increases the curve reduced, therefore, when power detector 280/380 detects that the power of amplified radiofrequency signal reduces along with frequency increase, control signal Ctrl can be set as there is the first state, in order to be compensated the uneven phenomenon of power output of radiofrequency signal by radio frequency equalizer 230.
It should be noted that the capacitance of electric capacity C1 and the inductance value of inductance L 2 can adjust along with the slope size of required frequency response, to reach best compensation effect.According to one embodiment of the invention, when the capacitance of electric capacity C1 and inductance L 2 inductance value more hour, a slope of the frequency response corresponding to radio frequency equalizer is larger.For example, as shown in Figure 5 b, the capacitance of the electric capacity C1 corresponding to frequency response curve 502 and the inductance value of inductance L 2 are less than the capacitance of the electric capacity C1 corresponding to frequency response curve 501 and the inductance value of inductance L 2.
According to another embodiment of the present invention, when power detector 280/380 judges that the power of amplified radiofrequency signal increases progressively along with frequency increase (such as, shown in the curve of Fig. 1 b), can produce and there is the second state (such as, one logic low state or a logic-high state) control signal Ctrl, in order to the handover operation of control switch S1, S2 and S3, so obtain the equivalent circuit diagram of radio frequency equalizer as shown in Figure 6 a-.
As shown in Figure 6 a, when control signal Ctrl has the second state, the equivalent electric circuit of radio frequency equalizer 630 comprises resistance R1 and R2, electric capacity C2 and inductance L 1.Inductance L 1 and resistance R1 and R2 coupled in parallel are between input IN and output OUT, and electric capacity C2 is coupled between the tie point N1 of resistance R1 and R2 and an end points (such as, an earth point).It should be noted that now electric capacity C1 and input IN and output OUT is electrically insulated, and inductance L 2 and resistance R1 and R2 are electrically insulated.
Fig. 6 b shows radio frequency equalizer frequency response curve described according to another embodiment of the present invention.The frequency response of frequency response curve shown in Fig. 6 b corresponding to the equivalent electric circuit of the radio frequency equalizer shown in Fig. 6 a.As shown in the figure, the curve that frequency response corresponding to the equivalent electric circuit of radio frequency equalizer 630 is insertion loss along with the frequency of radiofrequency signal increases, therefore, when power detector 280/380 detects that the power of amplified radiofrequency signal increases progressively along with frequency increase, control signal Ctrl can be set as there is the second state, in order to be compensated the uneven phenomenon of power output of radiofrequency signal by radio frequency equalizer 230.
It should be noted that the capacitance of electric capacity C2 and the inductance value of inductance L 1 can adjust along with the slope size of required frequency response, to reach best compensation effect.According to one embodiment of the invention, when the capacitance of electric capacity C2 and the inductance value of inductance L 1 larger time, a slope of the frequency response corresponding to radio frequency equalizer is larger.For example, as shown in Figure 6 b, the capacitance of the electric capacity C2 corresponding to frequency response curve 602 and the inductance value of inductance L 1 are greater than the capacitance of the electric capacity C2 corresponding to frequency response curve 601 and the inductance value of inductance L 1.
Fig. 7 is that after display compensating via radio frequency equalizer according to one embodiment of the invention, the power of the amplified radiofrequency signal exported by power amplifier is relative to a curve of frequency.As shown in the figure, compared to Fig. 1 a and Fig. 1 b, in embodiments of the invention, the frequency response corresponding to radio frequency equalizer is adjusted by control signal Ctrl, the power of amplified radiofrequency signal effectively can be increased relative to the flatness of the curve of frequency, therefore solve the uneven phenomenon of power output of radiofrequency signal.
Do not imply the order of the precedence between any priority, order of priority, each element or the step performed by method in claim in order to the use of ordinal numbers such as " first ", " second ", " the 3rd " of modified elements itself, and only distinguish the different elements with same names (there is different ordinal number) with making a check mark.
Though the present invention discloses as above with preferred embodiment; so itself and be not used to limit scope of the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on the appended right person of defining.
Claims (15)
1. a communication device, comprising:
One radio frequency transceiver, in order to produce multiple radiofrequency signal according to multiple fundamental frequency signal;
One radio frequency equalizer, is coupled to this radio frequency transceiver, in order to receive the plurality of radiofrequency signal, and produces multiple equalized radiofrequency signal according to a control signal;
One power amplifier, is coupled to this radio frequency equalizer, in order to receive the plurality of equalized radiofrequency signal, and amplifies the plurality of equalized radiofrequency signal to produce multiple amplified radiofrequency signal;
One duplexer, is coupled to this power amplifier, in order to receive the plurality of amplified radiofrequency signal, and the plurality of amplified radiofrequency signal is sent to an antenna; And
One power detector, in order to detect the power of the plurality of amplified radiofrequency signal, and produces this control signal according to the power of the plurality of amplified radiofrequency signal relative to a curve of frequency,
A frequency response wherein corresponding to this radio frequency equalizer is this control signal of response and is adjusted.
2. communication device according to claim 1, also comprises:
One directional coupler, is coupled between this power amplifier and this duplexer, in order to by the plurality of amplified radio frequency signal feedback of a part to this power detector.
3. communication device according to claim 2, wherein this power detector is contained in this radio frequency transceiver.
4. communication device according to claim 2, also comprises:
One fundamental frequency signal processing unit, in order to process and to produce the plurality of fundamental frequency signal, wherein this power detector is contained in this fundamental frequency signal processing unit.
5. communication device according to claim 1, wherein this radio frequency equalizer comprises:
One first resistance, is coupled to an input;
One second resistance, is coupled between this first resistance and an output;
One first electric capacity;
One first inductance;
One first switch, is coupled to this input, this first electric capacity and this first inductance, in order to this first electric capacity or this first inductance are coupled to this input according to this control signal selectivity;
One second switch, is coupled to this output, this first electric capacity and this first inductance, in order to this first electric capacity or this first inductance are coupled to this output according to this control signal selectivity;
One second electric capacity;
One second inductance; And
One the 3rd switch, is coupled to this first resistance, this second resistance, this second electric capacity and this second inductance, in order to this second electric capacity or this second inductance to be coupled to according to this control signal selectivity a tie point of this first resistance and this second resistance.
6. communication device according to claim 5, wherein when a capacitance of this first electric capacity and this second inductance an inductance value more hour, a slope of this frequency response corresponding to this radio frequency equalizer is larger.
7. communication device according to claim 5, wherein when an inductance value of this first inductance and a capacitance of this second electric capacity larger time, a slope of this frequency response corresponding to this radio frequency equalizer is larger.
8. communication device according to claim 2, wherein when this power detector detects that the power of the plurality of amplified radiofrequency signal reduces along with the frequency increase of the plurality of amplified radiofrequency signal, this radio frequency equalizer has an equivalent electric circuit and comprises:
One first resistance, is coupled to an input;
One second resistance, is coupled between this first resistance and an output;
One electric capacity, is coupled between this input and this output; And
One inductance, between the tie point being coupled to this first resistance and this second resistance and an end points.
9. communication device according to claim 2, wherein when this power detector detects that the power of the plurality of amplified radiofrequency signal increases along with the frequency increase of the plurality of amplified radiofrequency signal, this radio frequency equalizer has an equivalent electric circuit and comprises:
One first resistance, is coupled to an input;
One second resistance, is coupled between this first resistance and an output;
One inductance, is coupled between this input and this output; And
One electric capacity, between the tie point being coupled to this first resistance and this second resistance and an end points.
10. communication device according to claim 2, wherein this power detector produces this control signal to adjust this frequency response corresponding to this radio frequency equalizer, in order to increase the flatness of power relative to a curve of the frequency of the plurality of amplified radiofrequency signal of the plurality of amplified radiofrequency signal.
11. 1 kinds of radio frequency equalizer, in order to receive multiple radiofrequency signal, and produce multiple equalized radiofrequency signal according to a control signal, comprising:
One first resistance, is coupled to an input;
One second resistance, is coupled between this first resistance and an output;
One first electric capacity;
One first inductance;
One first switch, is coupled to this input, this first electric capacity and this first inductance, in order to this first electric capacity or this first inductance are coupled to this input according to this control signal selectivity;
One second switch, is coupled to this output, this first electric capacity and this first inductance, in order to this first electric capacity or this first inductance are coupled to this output according to this control signal selectivity;
One second electric capacity;
One second inductance; And
One the 3rd switch, is coupled to this first resistance, this second resistance, this second electric capacity and this second inductance, in order to this second electric capacity or this second inductance to be coupled to according to this control signal selectivity a tie point of this first resistance and this second resistance.
12. radio frequency equalizer according to claim 11, wherein when this control signal has first state, this first electric capacity is coupled between this input and this output, this first inductance and this input and this output are electrically insulated, between the tie point that this second inductance is coupled to this first resistance and this second resistance and an end points, and this second electric capacity and this first resistance and this second resistance are electrically insulated.
13. radio frequency equalizer according to claim 11, wherein when this control signal has second state, this first inductance is coupled between this input and this output, this first electric capacity and this input and this output are electrically insulated, between the tie point that this second electric capacity is coupled to this first resistance and this second resistance and an end points, and this second inductance and this first resistance and this second resistance are electrically insulated.
14. radio frequency equalizer according to claim 11, wherein when a capacitance of this first electric capacity and this second inductance an inductance value more hour, a slope of the frequency response corresponding to this radio frequency equalizer is larger.
15. radio frequency equalizer according to claim 11, wherein when an inductance value of this first inductance and a capacitance of this second electric capacity larger time, a slope of the frequency response corresponding to this radio frequency equalizer is larger.
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| CN106341356B (en) * | 2015-07-10 | 2020-01-21 | 中兴通讯股份有限公司 | Method and device for compensating flatness of downlink carrier |
| CN111293998B (en) * | 2020-05-11 | 2020-09-01 | 锐石创芯（深圳）科技有限公司 | Capacitor switching chip and radio frequency power amplifying circuit |
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| JPWO2006013753A1 (en) * | 2004-08-06 | 2008-05-01 | 株式会社村田製作所 | High frequency composite parts |
| CN101374285B (en) * | 2008-10-15 | 2013-11-27 | 耿直 | Operation method for base station common transmit-receive transmission system |
| EP2337289A1 (en) * | 2009-12-18 | 2011-06-22 | Nxp B.V. | RF receiver |
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