CN106330099B - A kind of RF front-end circuit - Google Patents
A kind of RF front-end circuit Download PDFInfo
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- CN106330099B CN106330099B CN201510375518.8A CN201510375518A CN106330099B CN 106330099 B CN106330099 B CN 106330099B CN 201510375518 A CN201510375518 A CN 201510375518A CN 106330099 B CN106330099 B CN 106330099B
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Abstract
The present invention relates to technical field of electronic communication, and in particular to RF front-end circuit.Including, M radio frequency amplifies branch, it is divided into N number of frequency range, each frequency range includes setting quantity radio frequency amplification branch and same output end, each radio frequency amplification branch includes an input terminal, radio frequency amplifier and switch unit, it is exported after the signal amplification that the radio frequency amplification branch of the next predetermined band of control of switch unit inputs input terminal from output end, wherein N is the positive integer greater than 1, and M is more than or equal to N；Signal adapter, equipped with N number of input port and the first output end and second output terminal, output end of each input port respectively with a frequency range is correspondingly connected with, when scheduled input port is selected, adjusting match parameter is adapted signal adapter with the radio frequency amplification branch being strobed, and exports after the signal of input port is converted to differential signal.The present invention can save outputting inductance, reduce chip area and design complexities.
Description
Technical field
The present invention relates to technical field of electronic communication, and in particular to a kind of RF front-end circuit.
Background technique
With the fast development of wireless communication technique, in order to meet various application demands, the application of multimode multi-frequency section is supported
Mobile phone radio frequency chip becomes the direction of wireless communication technique development, and RF front-end circuit is most important as realization multimode multi-frequency section
Module, existing design is generally basede on low-noise amplifier (Low Noise of the differential configuration with degeneration inductor
Amplifier, LNA), and many frequencies between 728MHz~2690MHz are covered using multiple load inductances in output end
Section, specific circuit structure is as shown in Figure 1, the main frequency range shared load inductance similar in frequency of above structure, the face of chip
Product is significantly increased with the number of load inductance, while also needing many frequency mixers (MIXER) and local oscillator accesses
(LO path) increases design complexities, wastes chip area.Furthermore difference channel needs many input ports, serious
Increase the size of chip area and encapsulation.
Summary of the invention
The object of the present invention is to provide a kind of RF front-end circuits, solve the above technical problem；
Technical problem solved by the invention can be realized using following technical scheme:
A kind of RF front-end circuit, wherein including,
M radio frequency amplifies branch, is divided into N number of frequency range, each frequency range include setting quantity radio frequency amplification branch with
Same output end, each radio frequency amplification branch includes an input terminal, radio frequency amplifier and switch unit, in the switch list
The radio frequency amplification branch of the next predetermined band of control of member is strobed after the signal amplification to input terminal input from described defeated
Outlet output, wherein N is the positive integer greater than 1, and M is more than or equal to N；
Signal adapter is equipped with N number of input port and the first output end and second output terminal, each input port point
The output end not with a frequency range is correspondingly connected with, and when the scheduled input port is selected, adjusting match parameter makes
The signal adapter is adapted with the radio frequency amplification branch being strobed, and the signal of the input port is converted to difference letter
It is exported after number.
RF front-end circuit of the invention connects adjustable humorous between first output end and the second output terminal
Shake unit, adjustably makes the signal adapter resonance in the corresponding frequency range of radio frequency amplification branch being strobed.
The signal output end of RF front-end circuit of the invention, the signal adapter connects a frequency mixer, by the letter
The signal of number converter output and the signal of a local oscillator, which carry out be mixed realization signal, to be converted.
RF front-end circuit of the invention, the band limits of multiple radio frequencies amplification branches coverings from 750MHz extremely
2690MHz。
RF front-end circuit of the invention, the signal adapter include input channel and output channel, and the input is logical
Road includes the predetermined number connecting with supply voltage and at least N number of inductance being serially connected, and the inductance in N number of predetermined position connects
Junction draws the input port respectively；The output channel includes being series at first output end and second output
Multiple outputting inductances between end；The coupling of the outputting inductance of the inductance of the input channel and the output channel.
RF front-end circuit of the invention, the radio frequency amplifier use source degeneration inductance type low-noise amplifier, and/
Or, the switch unit is using gate transistor altogether.
RF front-end circuit of the invention, the input channel is using first coil coiling from inside to outside and is connected to institute
Supply voltage to be stated, draws N number of input port respectively in pre-position, the output channel uses the second coil, and described first
Coil and the parallel coiling of the second coil, and the signal output end is drawn respectively in head and tail portion.
RF front-end circuit of the invention, the first coil and second coil in the shape of a spiral parallel winded at four sides
Shape structure.
RF front-end circuit of the invention, the radio frequency amplify branch and include,
First amplifying unit, the input terminal pass through the signal input part coupling of a first capacitor and first amplifying unit
It connects；
Second amplifying unit, the input terminal pass through the signal input part coupling of one second capacitor and second amplifying unit
It connects；
The output end of first amplifying unit is controllably connected to the output end in first switch device；
The output end of second amplifying unit is controllably connected to the output end in second switch device；
The output end is connected to the signal input part of second amplifying unit by a feedback branch；
The switch unit is constituted with the first switch device and the second switch device.
RF front-end circuit of the invention, the first switch device and second amplifying device using PMOS tube and
The complementary structure of NMOS tube.
The utility model has the advantages that due to using the technology described above, the present invention can save outputting inductance, it is multiplexed frequency mixer and local
Access is vibrated, chip area and design complexities are reduced.
Detailed description of the invention
Fig. 1 is the RF front-end circuit figure of the prior art；
Fig. 2 is a kind of RF front-end circuit figure of multimode multi-frequency section of the invention；
Fig. 3 is the RF front-end circuit figure of another multimode multi-frequency section of the invention；
Fig. 4 is the configuration figure of signal adapter of the invention；
Fig. 5 is a kind of circuit diagram that radio frequency of the invention amplifies branch.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art without creative labor it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be further explained below with reference to the attached drawings and specific examples, but not as the limitation of the invention.
In view of the RF front-end circuit implementation of current multimode multi-frequency section, covered very using multiple load inductances
Multiple frequency ranges, multiple load inductances need to occupy excessive chip area；And the frequency mixer for needing to design multichannel and locally vibration
Device circuit, such as Fig. 1 are swung, using the amplifier amp01 to amp09 and frequency mixer Mixer1, Mixer2, Mixer3 of Differential Input,
It further occupies more chip areas and increases design complexities.For the improvement of above scheme, it is assumed that a kind of ideal
Situation is the frequency range that can use an inductance covering very wide at output, such as from 716MHz~2690MHz all standing, so
And according to the following formula:
Zreal=2 π f*L*QL, wherein ZrealValue is impedance value, and L is the inductance value of load inductance, QLFor the load inductance
Quality factor；Limitation and quality factor Q value due to the inductance value of inductance change greatly in broadband, will lead to radio frequency reception
The gain of module declines seriously in many frequency ranges, and noise coefficient (Noise Figure, NF) significantly improves, so using single
The very wide frequency range of inductance covering is simultaneously unrealistic.
Fig. 2 is a kind of RF front-end circuit figure of multimode multi-frequency section of the invention, as shown in Fig. 2, a kind of radio-frequency front-end is electric
Road, including, M radio frequency amplifies branch, be divided into N number of frequency range, each frequency range include setting quantity radio frequency amplification branch with
Same output end, each radio frequency amplification branch includes an input terminal, radio frequency amplifier and switch unit, in the control of switch unit
It is exported after the signal amplification that the radio frequency amplification branch of one of predetermined band inputs input terminal down from output end, wherein N is
Positive integer greater than 1, M are more than or equal to N；
Signal adapter, is equipped with N number of input port and the first output end and second output terminal, each input port respectively with
The output end of one frequency range is correspondingly connected with, and when the scheduled input port is selected, adjusting match parameter makes the signal
Converter is adapted with the radio frequency amplification branch being strobed, and the signal of the input port is converted to defeated after differential signal
Out.
Specifically, it can connect adjustable resonant capacitance between the first output end and second output terminal, adjustably make
The signal of input port is converted to differential signal in the corresponding frequency range of radio frequency amplification branch being strobed by signal adapter resonance
After export.
It include that 9 radio frequencies amplify branch, and are divided into three frequency ranges as a kind of specific embodiment, in Fig. 2, respectively
For high band, Mid Frequency and low-frequency range, each frequency range has an output end, wherein the covering model of high band (High-band)
Enclosing can be 2350MHz~2690MHz, and the coverage area of Mid Frequency (Middle-band) can be 1805MHz~2170MHz,
And the coverage area of low-frequency range (Low-band) can be 716MHz~960MHz；Each radio frequency amplification branch includes single input
End, radio frequency amplifier and switch unit, in Fig. 2, the input signal difference of the input terminal of each radio frequency amplification branch of high band
For HB1, HB2, HB3, corresponding radio frequency amplifier is respectively amp1, amp2, amp3, the switch list of each radio frequency amplification branch road
Member is respectively SW1, SW2, SW3, correspondingly, the input signal of the input terminal of each radio frequency amplification branch of Mid Frequency is respectively
MB1, MB2, MB3, corresponding radio frequency amplifier are respectively amp4, amp5, amp6, the switch unit of each radio frequency amplification branch road
Respectively SW4, SW5, SW6, low-frequency range each radio frequency amplification branch input terminal input signal be respectively LB1, LB2,
LB3, corresponding radio frequency amplifier are respectively amp7, amp8, amp9, and the switch unit of each radio frequency amplification branch road is respectively
SW7, SW8, SW9, above-mentioned each frequency range have an output end, one of predetermined band under the control of Yu Shangshu switch unit
Radio frequency amplification branch signal that input terminal input is amplified after export from corresponding output end to a signal adapter 11, signal
Converter 11 is equipped with input port corresponding with above-mentioned output end, respectively Input_HB, Input_MB, Input_LB,
Adjustable resonant capacitance C is connected between two signal output ends of signal adapter 11, adjustably makes signal adapter 11
Resonance exports after the signal of input port is converted to differential signal in corresponding frequency range.
As a kind of specific embodiment, the signal output end of signal adapter 11 of the invention connects a frequency mixer
The signal that signal adapter 11 exports be mixed with the signal LO signal of a local oscillator and realizes that signal becomes by Mixer
It changes.
I.e. by above-mentioned implementation, in the circuit of multimode multi-frequency section, the signal of each frequency range passes through signal adapter
11 realize the conversion of single-ended-to-differences, and differential signal is exported to a frequency mixer Mixer, and frequency mixer Mixer is by signal adapter
The signal of output, which be mixed with the signal of a local oscillator, realizes signal transformation.It can be omitted many inductive circuits and mix
Frequency device, to save the area of chip.
As a kind of specific embodiment of the invention, before Fig. 4 shows the radio frequency of another multimode multi-frequency section of the invention
Terminal circuit figure, signal adapter 11 include input channel and output channel, input channel include connect with supply voltage VCC it is pre-
At least N number of inductance ordering quantity and being serially connected, the tie point minute of the point or inductance that are connected between the inductance in N number of predetermined position
It Yin Chu not input port；Output channel includes the multiple outputting inductances being series between the first output end and second output terminal；It is defeated
Enter access and output channel by inductive coupling, is exported after the signal of input port is converted to differential signal.One is used as in Fig. 4
Kind of specific embodiment, the input channel of signal adapter include 3 inductance being serially connected, respectively inductance L1, inductance L2 and
Inductance L3, the point that wherein inductance L1 and inductance L2 are connected in series draw input port Input_HB, and inductance L2 is connected in series with inductance L3
Point draw input port Input_MB, one end of inductance L3 connects with inductance L2, other end extraction input port Input_LB,
Output channel is parallel to mutually in outputting inductance L5, outputting inductance L6 and outputting inductance L7 including being serially connected, resonant capacitance C
Concatenated outputting inductance both ends, according to following resonance frequency formula:
By adjusting the capacitance of resonant capacitance C, so that circuit resonance is in phase
The frequency answered, to improve the output impedance characteristic of circuit.Above-mentioned signal adapter 11 can be realized using balun.
As a kind of specific embodiment, Fig. 4 is the configuration figure of signal adapter of the invention, in order to logical with output
The wiring on road is mutually distinguished, and herein, the wiring of input channel is indicated with chain-dotted line, is not offered as the type of wiring of practical wiring, defeated
The wiring of access is indicated out with solid line, and input channel is used to be routed with first coil, and output channel uses the second coil windings, the
It is in quadrilateral structure after one coil and the parallel coiling of the second coil.
Specifically, first coil coiling from inside to outside and is connected to supply voltage VCC in the shape of a spiral, and in predetermined position point
N number of input port is drawn respectively, such as Input_HB, Input_MB, Input_LB, the second coil and first coil of output channel
Parallel coiling simultaneously draws signal output end OUTP and OUTN in the head of the second coil and tail portion respectively respectively.It is inputted by three
Port change the inductance of primary coils access of the input channel perhaps referred to as in barron structure and meanwhile adjust output channel or
Say the capacitance of secondary coil in barron structure, can resonance in each frequency range.
The specific course of work can be described below, by taking Fig. 3 as an example:
When high band operation, the switch unit of high band partial response is opened, other switch units are closed, high band
The output end of radio frequency amplification branch is connected to corresponding input port Input_HB, and the inductance of balun input channel access at this time is
Minimum adjusts the output impedance performance of resonant capacitance C, the Lai Gaishan radio frequency amplifier part at the secondary coil of balun at this time.
In the middle when band operation, the switch unit of Mid Frequency partial response is opened, other switch units are closed, Mid Frequency
The output end of radio frequency amplification branch is connected to corresponding input port Input_MB, the inductance phase of balun input channel access at this time
To larger, the output impedance of resonant capacitance C, the Lai Gaishan radio frequency amplifier part at the secondary coil of balun is adjusted at this time
Energy.
When low-frequency range work, the switch unit of low-frequency range partial response is opened, other switch units are closed, low-frequency range
The output end of radio frequency amplification branch is connected to corresponding input port Input_LB, and the inductance of balun input channel access at this time is most
Greatly, the output impedance performance of resonant capacitance C, the Lai Gaishan radio frequency amplifier part at the secondary coil of balun is adjusted at this time.
As a kind of specific embodiment, radio frequency amplifies radio frequency amplifier in branch and uses source degeneration inductance type low noise
Amplifier, switch unit is using bank tube altogether.As shown in figure 3, one switch unit of each radio frequency amplification branch road series connection, switch unit
Using total gate transistor (cascode pipe), source degeneration inductance type low-noise amplifier such as LNA1 to LNA9, due to the low noise
Amplifier is not belonging to the improved content of the present invention, and and therefore not to repeat here.
As another specific embodiment of the invention, radio frequency, which amplifies branch, to include,
First amplifying unit, input terminal are coupled by the signal input part of a first capacitor C1 and the first amplifying unit；
Second amplifying unit, input terminal are coupled by the signal input part of one second capacitor C2 and the second amplifying unit；
The output end of the first amplifying unit is controllably connected to the output end of radio frequency amplification branch in first switch device；
The output end of the second amplifying unit is controllably connected to the output end of radio frequency amplification branch in second switch device；
The output end of radio frequency amplification branch also passes through the signal input part that a feedback branch is connected to the second amplifying unit,
First switch device and second switch device constitute switch unit.
It can specifically be realized using the circuit of Fig. 5, the circuit structure of Fig. 5 is described below:
First amplifying unit of radio frequency amplification branch includes PMOS tube M1, the input terminal of grid and radio frequency amplification branch
Input coupling, source electrode are connect with supply voltage VCC, and drain electrode is connected to radio frequency by PMOS switch pipe M5 and amplifies the defeated of branch
Outlet Output；Second amplifying unit includes NMOS tube M2, and the input terminal Input that grid and radio frequency amplify branch is coupled,
Source electrode ground connection, drain electrode are connected to the output end Output that radio frequency amplifies branch by NMOS switch pipe M6, and radio frequency amplifies branch
Output end also passes through the signal input part that a resistance R3 is connected to NMOS tube M2 as feedback branch；The radio frequency amplify branch also into
One step includes the first buffer cell and the second buffer cell, and the first buffer cell uses PMOS switch pipe M3, the second buffer cell
Using NMOS switch pipe M4, the point that the first buffer cell is connected with the second buffer cell feeds back to NMOS tube M2 by resistance R2
Signal input part.In Fig. 5, noise canceller circuit (Noise is added by using PMOS and NMOS complementary structure
Canceling) Lai Shixian, wherein PMOS tube M1 and NMOS tube M2 realizes amplifier function using the circuit of PN complementation, and
Switching tube M5 and switching tube M6 realize switch unit function, those skilled in the art for radio frequency amplification branch other modifications or
Implementation is also in the coverage area of present application.
By being emulated with Fig. 3, it is as shown in the table to obtain preliminary simulation result:
| Freq(MHz) | Gain(dB) | NF(dB |
| 750M | 43.6 | 1.43 |
| 2170M | 42.7 | 1.54 |
| 2690M | 42.3 | 1.65 |
Above-mentioned simulation result shows that structure of the invention is suitable for the design of the RF front-end circuit of multimode multi-frequency section.
The band limits of multiple radio frequency amplification branch coverings can be from 750MHz to 2690MHz.Have reason to believe the band limits of covering
728MHz can be extended to 2690MHz.
Above-mentioned high band, Mid Frequency and low-frequency range can be multiplexed frequency mixer and local oscillated signal access, reduce chip
Area and design complexities.The design of Simultaneous Switching unit does not need the tandem tap circuit in balun, therefore will not reduce bar
The quality factor Q value of human relations.
The foregoing is merely preferred embodiments of the present invention, are not intended to limit embodiments of the present invention and protection model
It encloses, to those skilled in the art, should can appreciate that all with made by description of the invention and diagramatic content
Equivalent replacement and obviously change obtained scheme, should all be included within the scope of the present invention.
Claims (9)
1. a kind of RF front-end circuit, which is characterized in that including,
M radio frequency amplifies branch, is divided into N number of frequency range, and each frequency range includes that setting quantity radio frequency amplifies branch and same
Output end, each radio frequency amplification branch include an input terminal, radio frequency amplifier and switch unit, Yu Suoshu switch unit
The radio frequency amplification branch for controlling next predetermined band is strobed after the signal amplification to input terminal input from the output end
Output, wherein N is the positive integer greater than 1, and M is more than or equal to N；
Signal adapter, is equipped with N number of input port and the first output end and second output terminal, each input port respectively with
The output end of one frequency range is correspondingly connected with, and when the scheduled input port is selected, adjusting match parameter makes described
Signal adapter is adapted with the radio frequency amplification branch being strobed, and after the signal of the input port is converted to differential signal
Output；
The radio frequency amplifies branch,
First amplifying unit, the input terminal are coupled by the signal input part of a first capacitor and first amplifying unit；
Second amplifying unit, the input terminal are coupled by the signal input part of one second capacitor and second amplifying unit；
The output end of first amplifying unit is controllably connected to the output end in first switch device；
The output end of second amplifying unit is controllably connected to the output end in second switch device；
The output end is connected to the signal input part of second amplifying unit by a feedback branch；
The switch unit is constituted with the first switch device and the second switch device.
2. RF front-end circuit according to claim 1, which is characterized in that first output end and second output
Adjustable resonant element is connected between end, and the signal adapter resonance is adjustably made to amplify branch in the radio frequency being strobed
Corresponding frequency range.
3. RF front-end circuit according to claim 1, which is characterized in that the signal output end of the signal adapter connects
A frequency mixer is connect, the signal that the signal adapter exports be mixed with the signal of a local oscillator and realizes that signal becomes
It changes.
4. RF front-end circuit according to claim 1, which is characterized in that the frequency of multiple radio frequency amplification branch coverings
Segment limit is from 750MHz to 2690MHz.
5. RF front-end circuit according to claim 1, which is characterized in that the signal adapter include input channel and
Output channel, the input channel include the predetermined number connecting with supply voltage and the inductance being serially connected, N number of predetermined position
The inductance connection point at draw the input port respectively；The output channel include be series at first output end and
Multiple outputting inductances between the second output terminal；The outputting inductance coupling of the inductance of the input channel and the output channel
It closes.
6. RF front-end circuit according to claim 1, which is characterized in that the radio frequency amplifier is using source-electrode degradation electricity
Sense type low-noise amplifier, and/or, the switch unit is using gate transistor altogether.
7. RF front-end circuit according to claim 5, which is characterized in that the input channel uses a first coil certainly
Coiling from inside to outside is simultaneously connected to the supply voltage, draws N number of input port respectively in pre-position, the output channel is adopted
With the second coil, the first coil and the parallel coiling of the second coil, and the signal is drawn respectively in head and tail portion
Output end.
8. RF front-end circuit according to claim 7, which is characterized in that the first coil and second coil are in
Helical form parallel winded quadrangularly structure.
9. RF front-end circuit according to claim 1, which is characterized in that the first switch device and described second is put
Big device uses the complementary structure of PMOS tube and NMOS tube.
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| CN201510375518.8A CN106330099B (en) | 2015-06-30 | 2015-06-30 | A kind of RF front-end circuit |
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| CN201510375518.8A CN106330099B (en) | 2015-06-30 | 2015-06-30 | A kind of RF front-end circuit |
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| CN107846560A (en) * | 2017-12-12 | 2018-03-27 | 江苏德是和通信科技有限公司 | A kind of uhf band adjustable transmitter power amplifier mechanism |
| CN109302203B (en) * | 2018-11-19 | 2024-04-02 | 江苏卓胜微电子股份有限公司 | Radio frequency front end port multiplexing circuit |
| CN111654304B (en) * | 2020-04-14 | 2021-11-12 | 普联技术有限公司 | Radio frequency circuit and radio frequency system |
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| CN1826734A (en) * | 2003-06-10 | 2006-08-30 | 诺基亚公司 | Multiband mixer |
| CN102158295A (en) * | 2011-04-02 | 2011-08-17 | 京信通信技术(广州)有限公司 | Signal power detection device for multi-band signal transmitting device and method thereof |
| CN102868419A (en) * | 2011-07-05 | 2013-01-09 | 联发科技股份有限公司 | Transceiver and integrated circuit |
| WO2014078333A2 (en) * | 2012-11-14 | 2014-05-22 | Qualcomm Incorporated | Omni-band amplifiers |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1826734A (en) * | 2003-06-10 | 2006-08-30 | 诺基亚公司 | Multiband mixer |
| CN102158295A (en) * | 2011-04-02 | 2011-08-17 | 京信通信技术(广州)有限公司 | Signal power detection device for multi-band signal transmitting device and method thereof |
| CN102868419A (en) * | 2011-07-05 | 2013-01-09 | 联发科技股份有限公司 | Transceiver and integrated circuit |
| WO2014078333A2 (en) * | 2012-11-14 | 2014-05-22 | Qualcomm Incorporated | Omni-band amplifiers |
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