CN105871408A - Front-end circuit of radio-frequency chip and signal transmission method - Google Patents
Front-end circuit of radio-frequency chip and signal transmission method Download PDFInfo
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- CN105871408A CN105871408A CN201610202429.8A CN201610202429A CN105871408A CN 105871408 A CN105871408 A CN 105871408A CN 201610202429 A CN201610202429 A CN 201610202429A CN 105871408 A CN105871408 A CN 105871408A
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- end circuit
- circuit
- balun
- signal
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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
- H04B1/40—Circuits
Abstract
The invention discloses a front-end circuit of a radio-frequency chip and a signal transmission method, relates to the technical field of wireless communications, and aims to solve the problems of a large number of components used in the front-end circuit, large circuit occupation area and lower chip integration degree in the prior art. The front-end circuit of the radio-frequency chip provided by the invention comprises a voltage chip selection circuit and a Balun, wherein the Balun comprises a first differential port, a center tap and a second differential port; the first differential port is used for being connected with a third differential port of an LNA (Low Noise Amplifier) and a fourth differential port of a PA (Power Amplifier); and the voltage chip selection circuit is used for grounding the center tap during signal transmission of the front-end circuit, and connecting the center tap with a power supply during signal reception of the front-end circuit. According to the front-end circuit, a power supply connecting way of the center tap of the Balun is adjusted, and a Balun is multiplexed during signal transmission or signal reception of the front-end circuit, so that one Balun is omitted, and the area of the front-end area is reduced compared with the prior art.
Description
Technical field
The present invention relates to wireless communication technology field, particularly to front-end circuit and the signal of a kind of radio frequency chip
The method of transmission.
Background technology
Radio-frequency communication technology is an important branch in wireless communication technology.Radio-frequency communication technology uses frequency
Rate is the electromagnetic wave of 300KHz～300GHz, and the electromagnetic wave of this frequency can be propagated in atmosphere, and warp
The ionospheric reflection of atmosphere outer rim, the advantage that therefore radio-frequency communication technology has long transmission distance.At present,
Radio-frequency communication technology is widely used in the fields such as automatic identification, industrial monitoring, military affairs, local communication.Penetrate
Frequently mechanics of communication be broadly divided into RFID (Radio Frequency Identification, RF identification),
BlueTooth (bluetooth), Wi-Fi (WIreless-FIdelity, WiMAX), UWB (Ultra Wideband,
The carrierfree communication technology), Wimax (Worldwide Interoperability for Microwave Access,
Worldwide interoperability for microwave access), NFC (Near Field Communication, near-field communication) and ZigBee
(purple honeybee) is several.
Radio frequency chip can utilize radio-frequency technique to transmit data.Existing radio frequency chip has two for communication
Difference port: LNA (Low Noise Amplifier, low-noise amplifier) difference port and PA (Power
Amplifier, power amplifier) difference port.Wherein, the 3rd difference port of LNA is used for receiving difference
Signal, the 4th difference port of PA is used for sending differential signal.
In actual application, radio frequency chip to send or to receive data and also need to the 3rd difference port of LNA
Antenna is connected by front-end circuit with the 4th difference port of PA.The effect of front-end circuit is: at radio frequency core
During sheet signal to be sent, signal is amplified, to increase the power of the signal that antenna is launched；At radio frequency chip
When receiving signal, signal is changed, to facilitate radiofrequency signal that the signal received is processed.
As it is shown in figure 1, the front-end circuit of existing radio frequency chip, including two baluns (the first balun 5 He
First balun 6), a switch 7, for poor with the 3rd of the LNA receiving differential signal of radio frequency chip the
The 4th difference port dividing port and PA connects, and is connected with antenna 8.Existing front-end circuit components and parts
It is all external, needs to take 4 pins of radio frequency chip, use component number more, take circuit
Area is relatively big, reduces the integrated level of chip.
Summary of the invention
The embodiment of the present invention provides a kind of front-end circuit and the method for signal transmission of radio frequency chip, in order to solve
There is front-end circuit in prior art uses component number more, takies circuit area relatively big, reduces core
The integrated level problem of sheet.
The embodiment of the present invention provides the front-end circuit of a kind of radio frequency chip, including:
Voltage chip select circuit, balun；
Wherein, described balun includes: the first difference port of balance end, the centre cap of balance end, uneven
Second difference port of weighing apparatus end；
Wherein, described first difference port is for poor with the 3rd of the low-noise amplifier LNA of radio frequency chip the
Port is divided to be connected with the 4th difference port of power amplifier PA；
Described voltage chip select circuit is used for when described front-end circuit sends signal making described centre cap ground connection,
Described centre cap is made to connect power supply when described front-end circuit receives signal.
The front-end circuit of the radio frequency chip of the embodiment of the present invention is by adjusting the centre cap ground connection of balun or connecing
The mode of power supply, one balun of multiplexing when front-end circuit is used for sending signal or receiving signal, relative to existing
There is technology to use the front-end circuit of two baluns, save a balun, reduce the area of front-end circuit.
The embodiment of the present invention provides a kind of method carrying out signal transmission by front-end circuit, and the method includes:
Radio frequency chip is when needs receive signal, and the voltage chip select circuit in described front-end circuit sends first
Signal, and when needs send signal, the voltage chip select circuit in described front-end circuit sends the second letter
Number；
Described voltage chip select circuit is after receiving described first signal, by the balun in described front-end circuit
Heart tap connects power supply, and after receiving described secondary signal, by the center of the balun in described front-end circuit
Tap ground connection.
The method that the embodiment of the present invention provides can make the center of balun take out by control voltage chip selection signal
Head connects power supply or connects power supply, can be with the identical balun of multiplexing when making radio frequency chip receive or send signal, before making
Terminal circuit can use a balun less, reduce the area that front-end circuit takies.
Accompanying drawing explanation
Fig. 1 is the front-end circuit schematic diagram of prior art radio frequency chip；
Fig. 2 is the front-end circuit schematic diagram of the embodiment of the present invention；
Fig. 3 is the voltage chip select circuit schematic diagram of the embodiment of the present invention；
Fig. 4 is embodiment of the present invention balun LNA differential interface schematic diagram when being not integrated in radio frequency chip；
Fig. 5 is embodiment of the present invention balun PA differential interface when being not integrated in radio frequency chip；
Fig. 6 is embodiment of the present invention balun LNA differential interface when being integrated in radio frequency chip and PA interface shows
It is intended to；
Fig. 7 is the embodiment of the present invention the first programmable capacitor and the second programmable capacitor schematic diagram；
Fig. 8 is a kind of method flow schematic diagram being carried out signal transmission by front-end circuit of the embodiment of the present invention.
Detailed description of the invention
The embodiment of the present invention provides the front-end circuit of a kind of radio frequency chip, and this circuit includes voltage chip select circuit,
Balun；Wherein, described balun includes: the first difference port of balance end, the centre cap of balance end,
Second difference port of uneven end；Wherein, described first difference port is used for and described radio frequency chip
The 3rd difference port of low-noise amplifier LNA is connected with the 4th difference port of power amplifier PA；Institute
State voltage chip select circuit for described front-end circuit receive signal time make described centre cap connect power supply,
Described front-end circuit makes described centre cap ground connection when sending signal.The radio frequency chip of the embodiment of the present invention
Front-end circuit is by the way of adjusting the centre cap ground connection of balun or connecing power supply, at front-end circuit for sending out
One balun of multiplexing when the number of delivering letters or reception signal, uses the front end electricity of two baluns relative to prior art
Road, saves a balun, reduces the area of front-end circuit.
As in figure 2 it is shown, the embodiment of the present invention provides the front-end circuit of a kind of radio frequency chip, including:
Voltage chip select circuit D1, balun T0；
Wherein, described balun includes: the first difference port of balance end, the centre cap P2 of balance end,
Second difference port of uneven end；
Wherein, described first difference port is for poor with the 3rd of the low-noise amplifier LNA of radio frequency chip the
Port is divided to be connected with the 4th difference port of power amplifier PA；
Described voltage chip select circuit is for making described centre cap P2 connect when described front-end circuit receives signal
Ground, makes described centre cap P2 connect power supply when described front-end circuit sends signal.
The 3rd difference port of the LNA of the embodiment of the present invention is used for receiving differential signal, the 4th difference of PA
Port is used for sending differential signal.The 3rd difference port of LNA includes two ports: LNA difference anode
Mouth (LNA+) and LNA difference negative terminal mouth (LNA-).First difference port includes the first positive port P0
With the first negative terminal mouth P1.The positive port of LNA difference port P0 positive with the first of the balance end of balun is connected, LNA
Difference negative terminal mouth is connected with the first negative terminal mouth P1 of the balance end of balun.The 4th difference port of PA includes PA
Positive port (PA+) and PA negative terminal mouth (PA-).The positive port of PA and the first positive port P0 are connected, and PA bears
Port and the first negative terminal mouth P1 are connected.
Embodiment of the present invention front-end circuit send signal and receive circuit time, multiplexing balun T0.Difference is,
When receiving signal, the centre cap P2 of balun T0 connects power supply, and when sending signal, the centre cap P2 of balun connects
Ground.
The voltage chip select circuit D1 of the embodiment of the present invention can be to include but not limited to following two kinds of forms:
One, switch for single-pole double throw of form, two FETs.
The common port of switch is connected with the centre cap P2 of balun T0.Normally opened ground connection of switch, normally closed point
Connect power supply；Or normally closed ground connection of switch, normally opened point connects power supply.The control end of switch and control line T/R
It is connected.
When described front-end circuit is used for receiving signal, host computer, by controlling control line T/R, makes center take out
Head P2 connects power supply by switch；When described front-end circuit is used for sending signal, host computer is controlled by control
Line T/R processed, makes centre cap P2 by switch ground connection.
Two, two FETs of form
Optionally, as it is shown on figure 3, described voltage chip select circuit D1 includes: N-type FET
NM0 and p-type FET PM0,
Wherein, the centre cap P2 of the balance end of described balun T0, described p-type FET NM0
The source electrode of drain electrode and described p-type FET PM0 links together；Described N-type FET NM0
Source ground；The drain electrode of described p-type FET PM0 connects power supply；Described N-type FET NM0
The grid of grid and described p-type FET PM0 link together, and with the control line of radio frequency chip
T/R is connected；
Described control line T/R, for when described front-end circuit is used for receiving signal, controls described N-type field effect
Should disconnect by pipe NM0, described p-type FET PM0 turns on；It is used for sending signal at described front-end circuit
Time, controlling described N-type FET NM0 conducting, described p-type FET PM0 disconnects.
In actual application, it is low that the host computer of control radio frequency chip makes control line T/R when needs send signal
Level, p-type FET PM0 turns on, and centre cap P2 Yu VDD turns on.Control radio frequency chip
It is high level that host computer makes control line T/R when needs receive signal, and N-type FET NM0 turns on,
Centre cap P2 ground connection.
The chip select circuit of the embodiment of the present invention uses two FETs, uses device volume relative to switch
Volume less, chip occupying area is less, and cost is lower.
The position of balun T0 in embodiment of the present invention front-end circuit can be divided into two kinds:
It is integrated in radio frequency chip, maybe can be placed on outside radio frequency chip.
Position according to balun T0 can to the 3rd difference port of the LNA of radio frequency chip, the 4th of PA the
Difference port and front-end circuit are adjusted correspondingly.
Position one, balun T0 are placed on outside radio frequency chip
In the embodiment of the present invention, front-end circuit shakes for forming LC with LNA differential interface or PA differential interface
Swing circuit, and the resonant frequency of LC oscillating circuit should be equal to the frequency of the electromagnetic wave to send or to receive
Rate.The corresponding different wave frequency (equal to threshold value) of different types of radio frequency chip.Such as, bluetooth is penetrated
Frequently the wave frequency that chip is corresponding is that about 2.4GHz, NFC radio frequency chip correspondence wave frequency is
13.56MHz。
In order to make front-end circuit and LNA differential interface or the resonance of PA differential interface composition LC oscillating circuit
Frequency is equal to threshold value, needs to make LC oscillating circuit to meet following condition:
Inductance value L to LC oscillating circuit and capacitance C is needed to be controlled, to meet condition of resonance.
Method of the prior art is to use fixing inductance value L, by capacitance value C, makes LC vibration electricity
Road meets condition of resonance.
In the embodiment of the present invention, if balun T0 is placed on outside radio frequency chip, the stray inductance of balun T0 is difficult to
Control (if controlling to need to use special balun T0 with high precision electro inductance value, relatively costly).Can adopt
By method same as the prior art, by adding electricity in the differential interface of LNA and the differential interface of PA
Sense, controls the inductance value of lc circuit.
Optionally, as shown in Figure 4, described LNA also includes:
For the first inductance L2 and the second inductance L3 with described front-end circuit composition LC oscillating circuit；
As it is shown in figure 5, described PA also includes:
For the 3rd inductance L4 and the 4th inductance L5 with described front-end circuit composition LC oscillating circuit；
Wherein, the described 3rd positive port of difference that described first inductance L2 is connected in described LNA and ground
Between；
Between described 3rd difference negative terminal mouth and ground that described second inductance L3 is connected in described LNA；
Between the described 4th positive port of difference and ground that described 3rd inductance L4 is connected in described PA；
Between described 4th difference negative terminal mouth and ground that described 4th inductance L5 is connected in described PA.
The LNA of the embodiment of the present invention includes four inductance (L0, L1, the first inductance L2 and first
Inductance L3, four N-type FETs (NM1～NM4), four electric capacity (C1～C4).In LNA
The annexation of each element is as follows: L0 one termination VDD, another termination NM1 drain electrode, C1 with
L0 is in parallel；The one termination VDD of L1, the drain electrode of another termination NM2, C2 with L1 is in parallel；NM1's
Grid is connected together with the grid of NM2, and the input signal of the grid of NM1 and the grid of NM2 is
Bias voltage VB0.The substrate of NM1 is connected together with the substrate of NM3, and meets VSS；The lining of NM2
The end, is connected together with the substrate of NM4, and meets VSS；The source electrode of NM1 is connected together with the drain electrode of NM3,
The source electrode of NM2 is connected together with the drain electrode of NM4；The grid of NM3 is connected together with the grid of NM4,
And the grid of NM3 is bias voltage VB1 with the input signal of the grid of NM4；The source electrode of NM3 with
One end of L2 is connected together, and the source electrode of NM4 is connected together with one end of L3, the other end of L2 and L3
Meet VSS；C3 with L2 is in parallel, C4 with L3 is in parallel.Wherein, VDD is power supply, and VSS is ground.
The PA of the embodiment of the present invention includes two inductance (the 3rd inductance L4 and the 4th inductance L5), four
Individual N-type FET (NM5～NM8), two electric capacity (C5, C6).The company of each element in PA
Connect relation as follows: a termination VDD of L4, the drain electrode of another termination NM5, C1 with L0 is in parallel；L5
One termination VDD, another termination NM6 drain electrode, C6 with L5 is in parallel；The grid of NM5 and NM6
Grid be connected together, be attempted by VDD.The substrate of NM5 is connected together with the substrate of NM7, and
Meet VSS；The substrate of NM6 is connected together with the substrate of NM8, and meets VSS；The source electrode of NM5 with
The drain electrode of NM7 is connected together, and the source electrode of NM6 is connected together with the drain electrode of NM8；The grid of NM7 connects
Holding wire PA_IP (the anode input of PA), the grid of NM8 meets holding wire PA_IN, and (negative terminal of PA is defeated
Enter)；The source electrode of NM7 and NM8 is connected together, and is attempted by VSS.Wherein, VDD is power supply,
VSS is ground.The embodiment of the present invention uses LNA with PA identical with prior art.
First inductance L2, the second inductance L3, the numerical value of the 3rd inductance L4 and the 4th inductance L5 are much larger than bar
The stray inductance of human relations T0.Such as, the stray inductance of balun T0 is 1nH, and the first inductance L2 is 20nH,
Inductance value in LC oscillating circuit is stray inductance and first inductance L2 sum 21nH of balun T0, about etc.
Inductance value 20nH in the first inductance L2.
Position two, balun T0 are built in radio frequency chip
When balun T0 is built in radio frequency chip, the stray inductance of balun T0 is controlled.
Optionally, the stray inductance between described centre cap P2 and described positive port is 1nH～5nH；
Stray inductance between described centre cap P2 and described negative terminal mouth is 1nH～5nH.
As shown in Figure 6, without using first in embodiment of the present invention LNA differential interface and PA differential interface
Inductance L2, the second inductance L3, the 3rd inductance L4 and the 4th inductance L5, do not use four electric capacity
C3～C6.But need to use variable capacitance C7 and variable capacitance C8.
During built-in balun, the difference of LNA is: NM3 source electrode no longer connects the first inductance L2, the source of NM4
Pole no longer meets the second inductance L3, and NM3 source electrode and NM4 source electrode are connect by LNA as LNA the 3rd difference
Mouthful；NM5 drain electrode no longer meets the 3rd inductance L4, and the drain electrode of NM6 no longer meets the 4th inductance L5, PA will
NM5 drain electrode and NM6 drain as PA the 4th differential interface.NM3 source electrode is connected on one with NM5 drain electrode
Rise, for being connected with the first positive port P0；NM4 source electrode is connected together with the drain electrode of NM6, for
First negative terminal mouth P1 is connected；It is connected to variable capacitance C7, the first negative terminal between first positive port P0 and VSS
It is connected to variable capacitance C8 between mouth P1 and VSS.
Variable capacitance C7 and variable C 8 in the embodiment of the present invention can be programmable capacitor array.
Optionally, described front-end circuit also includes the first programmable capacitor array and the second programmable capacitor battle array
Row；
Described first programmable capacitor array is positioned at the positive port P0 of first in the first difference port and ground
Between, the first negative terminal mouth P1 that described second programmable capacitor array is positioned in the first difference port and ground
Between；
Wherein, described first programmable capacitor array and described second programmable capacitor array are in front end
Circuit is adjusted when receiving signal, makes the resonant frequency of described front-end circuit reach to set threshold value；
Described first programmable capacitor array and described second programmable capacitor array are for sending out at front-end circuit
It is adjusted during the number of delivering letters, makes the resonant frequency of described front-end circuit for reaching to set threshold value.
Embodiment of the present invention programmable capacitor array can make front-end circuit when sending signal and receive signal
Time resonant frequency all reach to set thresholding, improve the energy of signal that equipment sends and receives.
As it is shown in fig. 7, the embodiment of the present invention provides the first programmable capacitor array and the second programmable capacitor battle array
The schematic diagram that row are made up of four electric capacity (C11～C14) and four FETs (NM11～NM14).
The capacitance of each electric capacity can be the same or different, and each programmable capacitor array can be used to from penetrating
Frequently four data lines of chip control whether corresponding FET turns on, and then control in four electric capacity
One or more circuit that whether access, and then control the capacitance of whole programmable capacitor array.Such as,
C11 be 1pF, C12 be 2pF, C13 be 4pF, C14 be 8pF.Capacity control line is divided into 4:
B0～B3, wherein, control line B0 is high level, and B1 is low level, and B2 is low level, and B3 is high electricity
Flat, then C0 and C3 accesses circuit, and the capacitance of whole programmable capacitor array is 1pF+8pF=9pF.Need
It is noted that the form of the first programmable capacitor array and the second programmable capacitor includes but not limited to Fig. 7
In the form that is given, above the capacitance of the electric capacity comprised in capacitor array is served only for illustrating,
Actual application can be chosen the capacitance of electric capacity flexibly.
Embodiment of the present invention front-end circuit, when sending or receive signal, needs to adjust programmable capacitor
Whole. make LC oscillating circuit meet condition of resonance above.
Based on same inventive concept, the embodiment of the present invention additionally provides and carries out signal transmission by front-end circuit
Method, owing to the equipment that the method is corresponding is the equipment in the embodiment of the present invention, and equipment solve problem
The unit affinity of principle and the embodiment of the present invention, therefore the enforcement of the method may refer to the enforcement of equipment,
Repeat no more in place of repetition.
As shown in Figure 8, the embodiment of the present invention provides a kind of method carrying out signal transmission by front-end circuit,
Described front-end circuit is the above front-end circuit, and the method includes:
Step 801, radio frequency chip voltage sheet choosing electricity when needs receive signal, in described front-end circuit
Road sends the first signal, and the voltage sheet choosing electricity when needs send signal, in described front-end circuit
Road sends secondary signal；
Step 802, described voltage chip select circuit is after receiving described first signal, by described front-end circuit
The centre cap of balun connect power supply, and after receiving described secondary signal, by described front-end circuit
The centre cap ground connection of balun.
The method that the embodiment of the present invention provides can make the center of balun take out by control voltage chip selection signal
Head connects power supply or connects power supply, can be with the identical balun of multiplexing when making radio frequency chip receive or send signal, before making
Terminal circuit can use a balun less, reduce the area that front-end circuit takies.
First signal of the embodiment of the present invention and the shape of the form foundation above chip select circuit of secondary signal
Formula.Such as, chip select circuit is made up of a N-type FET above and a p-type FET,
Then the first signal is high level, and secondary signal is low level.
Optionally, described voltage chip select circuit is after receiving described first signal, by described front-end circuit
The centre cap of balun connect power supply, including:
Described voltage chip select circuit, after receiving described first signal, turns in described voltage chip select circuit
N-type FET disconnects, so that the centre cap of the balun in described front-end circuit connects power supply；
Described voltage chip select circuit is after receiving described secondary signal, by the balun in described front-end circuit
Centre cap ground connection, including:
Described voltage chip select circuit, after receiving described secondary signal, turns on the P in described voltage chip select circuit
Type FET disconnects, so that the centre cap ground connection of the balun in described front-end circuit；
Wherein, the grid of described N-type FET links together with the grid of described p-type FET.
It can be seen from the above: the embodiment of the present invention provides a kind of front-end circuit, including: voltage sheet selects
Circuit, balun；Wherein, described balun includes: the first difference port of balance end, the center of balance end is taken out
Head, the second difference port of uneven end；Wherein, low for radio frequency chip of described first difference port
The 3rd difference port of noise amplifier LNA is connected with the 4th difference port of power amplifier PA；Described
Voltage chip select circuit is for making described centre cap connect power supply, described when described front-end circuit receives signal
Front-end circuit makes described centre cap ground connection when sending signal.The front end electricity of the radio frequency chip of the embodiment of the present invention
Road, by the way of adjusting the centre cap of balun and connecing power supply or connect power supply, is used for receiving letter at front-end circuit
Number or send signal time one balun of multiplexing, relative to prior art use two baluns front-end circuit,
Save a balun, reduce the area of front-end circuit.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. the front-end circuit of a radio frequency chip, it is characterised in that including:
Voltage chip select circuit, balun；
Wherein, described balun includes: the first difference port of balance end, the centre cap of balance end, no
Second difference port of balance end；
Wherein, described first difference port is for poor with the 3rd of the low-noise amplifier LNA of radio frequency chip the
Port is divided to be connected with the 4th difference port of power amplifier PA；
Described voltage chip select circuit is for making described centre cap connect when described front-end circuit sends signal
Ground, makes described centre cap connect power supply when described front-end circuit receives signal.
2. front-end circuit as claimed in claim 1, it is characterised in that described front-end circuit also includes the
One programmable capacitor array and the second programmable capacitor array；
First positive between port and ground in the first difference port of described first programmable capacitor array,
Between the described second programmable capacitor array the first negative terminal mouth and ground in the first difference port；
Wherein, described first programmable capacitor array and described second programmable capacitor array are in front end
Circuit is adjusted when receiving signal, makes the resonant frequency of described front-end circuit reach to set threshold value；
Described first programmable capacitor array and described second programmable capacitor array are for sending out at front-end circuit
It is adjusted during the number of delivering letters, makes the resonant frequency of described front-end circuit for reaching to set threshold value.
3. front-end circuit as claimed in claim 1, it is characterised in that described voltage chip select circuit bag
Include: N-type FET and p-type FET,
Wherein, the centre cap of the balance end of described balun, the drain electrode of described N-type FET and described P
The source electrode of type FET links together；The source ground of described N-type FET；Described p-type field is imitated
The drain electrode of pipe should connect power supply；The grid of described N-type FET is connected with the grid of described p-type FET
Together, and with the control line of radio frequency chip it is connected；
Described control line, for when described front-end circuit is used for sending signal, controls described p-type FET
Disconnecting, described N-type FET turns on；When described front-end circuit is used for receiving signal, control described P
Type FET turns on, and described N-type FET disconnects.
4. front-end circuit as claimed in claim 1, it is characterised in that
Described N-type FET, p-type FET and described balun are integrated in described radio frequency chip；Or
Described N-type FET and p-type FET are integrated in described radio frequency chip, and described balun is positioned at
Outside radio frequency chip.
5. front-end circuit as claimed in claim 2, it is characterised in that
Stray inductance between described centre cap and described positive port is 1nH～5nH；
Stray inductance between described centre cap and described negative terminal mouth is 1nH～5nH.
6. the equipment of a transceiving radio frequency signal, it is characterised in that described equipment includes radio frequency chip and power
Profit requires 1～5 arbitrary described front-end circuits.
7. equipment as claimed in claim 6, it is characterised in that
Described LNA also includes:
For the first inductance L2 and the second inductance L3 with described front-end circuit composition LC oscillating circuit；
Described PA also includes:
For the 3rd inductance and the 4th inductance with described front-end circuit composition LC oscillating circuit；
Wherein, the described 3rd positive port of difference that described first inductance L2 is connected in described LNA and ground
Between；
Between described 3rd difference negative terminal mouth and ground that described second inductance L3 is connected in described LNA；
Between the described 4th positive port of difference and ground that described 3rd inductance is connected in described PA；
Between described 4th difference negative terminal mouth and ground that described 4th inductance is connected in described PA.
8. a radio frequency chip, it is characterised in that described radio frequency chip includes that Claims 1 to 5 is arbitrary
Described front-end circuit.
9. the method carrying out signal transmission by front-end circuit, it is characterised in that described front-end circuit
For the arbitrary described front-end circuit of Claims 1 to 5, the method includes:
Radio frequency chip is when needs receive signal, and voltage chip select circuit in described front-end circuit sends the
One signal, and when needs send signal, voltage chip select circuit in described front-end circuit sends the
Binary signal；
Described voltage chip select circuit is after receiving described first signal, by the balun in described front-end circuit
Centre cap connects power supply, and after receiving described secondary signal, by the balun in described front-end circuit
Centre cap ground connection.
10. method as claimed in claim 9, it is characterised in that described voltage chip select circuit is receiving
After stating the first signal, the centre cap of the balun in described front-end circuit is connect power supply, including:
Described voltage chip select circuit, after receiving described first signal, turns in described voltage chip select circuit
N-type FET disconnects, so that the centre cap of the balun in described front-end circuit connects power supply；
Described voltage chip select circuit is after receiving described secondary signal, by the balun in described front-end circuit
Centre cap ground connection, including:
Described voltage chip select circuit, after receiving described secondary signal, turns on the P in described voltage chip select circuit
Type FET disconnects, so that the centre cap ground connection of the balun in described front-end circuit；
Wherein, the grid of described N-type FET links together with the grid of described p-type FET.
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Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: HISENSE ELECTRIC Co.,Ltd. |