CN108736909A - The radio circuit and terminal of SAW filter combination anti aliasing purposes filter - Google Patents
The radio circuit and terminal of SAW filter combination anti aliasing purposes filter Download PDFInfo
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- CN108736909A CN108736909A CN201810438580.0A CN201810438580A CN108736909A CN 108736909 A CN108736909 A CN 108736909A CN 201810438580 A CN201810438580 A CN 201810438580A CN 108736909 A CN108736909 A CN 108736909A
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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
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1009—Placing the antenna at a place where the noise level is low and using a noise-free transmission line between the antenna and the receivers
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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
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
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Abstract
The radio circuit and terminal of SAW filter combination anti aliasing purposes filter, this application discloses a kind of signal processing circuit, which is applied to internet-of-things terminal, which includes：Antenna circuit, the first filter circuit, switching circuit, low noise amplifier circuit, mixting circuit, the second filter circuit, power amplification circuit and A/D conversion circuits；The output end of antenna circuit is connect with the input terminal of the first filter circuit, the output end of first filter circuit and the input terminal of switching circuit connect, the output end of switching circuit and the input terminal of low noise amplifier circuit connect, the output end of low noise amplifier circuit and the input terminal of mixting circuit connect, the output end of mixting circuit is connect with the input terminal of the second filter circuit, the output end of second filter circuit and the input terminal of power amplification circuit connect, and the output end of power amplification circuit is connect with the input terminal of A/D conversion circuits.Signal quality is improved by the signal processing circuit in the embodiment of the present application, is conducive to modem and receives radiofrequency signal.
Description
Technical field
This application involves circuit structure technical field more particularly to a kind of SAW filter combination anti aliasing purposes filters
Radio circuit and terminal.
Background technology
Internet of Things communicates cognition technology by Intellisense, identification technology and general fit calculation etc. and is widely used in melting for network
In conjunction, also therefore it is referred to as the third wave that world information industry develops after computer, internet.Technology of Internet of things
Rapid development and application, it is meant that the requirement to the communication technology is higher and higher, and the transmission of communication signal is faced with increasing
Challenge.
During existing internet-of-things terminal is launched and transmits signal, short-distance transmission can only be carried out, and passing
During defeated, it is vulnerable to interference.Moreover, when encountering interference, noise is more, leads to receiver sensitivity reduction and the increasing of ADC
Benefit is relatively low, is unfavorable for modem processes and receives signal.
Invention content
The embodiment of the present application provides a kind of Internet of Things radio circuit of SAW filter combination anti aliasing purposes filter
And terminal improves received signal quality to improve signal quality.
In a first aspect, the embodiment of the present application provides a kind of signal processing circuit, the signal processing circuit includes：Antenna electric
Road, the first filter circuit, switching circuit, low noise amplifier circuit, mixting circuit, the second filter circuit, power amplification circuit and
A/D conversion circuits；
The output end of the antenna circuit is connect with the input terminal of first filter circuit, first filter circuit
Output end is connect with the input terminal of the switching circuit, and the output end of the switching circuit is defeated with the low noise amplifier circuit
Enter end connection, the output end of the low noise amplifier circuit is connect with the input terminal of the mixting circuit, the mixting circuit
Output end is connect with the input terminal of second filter circuit, output end and the power amplification electricity of second filter circuit
The input terminal on road connects.
Optionally, first filter circuit includes：First filter part, second filter part, third filtering device and
4th filtering device；
The first filter part composes in parallel the first parallel circuit, the third filter with the second filter part
Part composes in parallel the second parallel circuit with the 4th filtering device, and the first end of first parallel circuit is filtered with described first
The first end of wave circuit input signal connects, the first end of the second end of first parallel circuit and second parallel circuit
Connection, the second end of second parallel circuit are connect with the second end of the first filter circuit input signal；
Two ends of the first end of second parallel circuit with second end as the first filter circuit output signal
Mouthful.
Optionally, the switching circuit is multidiameter option switch, and the switching circuit includes 4 road emissioning signal treatment circuits
Signal processing circuit is received with 8 tunnels, wherein 4 road emissioning signal treatment circuit is used to emit the radiofrequency signal of two frequency ranges,
8 tunnel receives the radiofrequency signal that signal processing circuit is used to receive two frequency ranges.
Optionally, the low noise amplifier circuit includes the first power supply, second source, third power supply, the first inductance, second
Inductance, third inductance, the first field-effect transistor, the second field-effect transistor, the first capacitance, the second capacitance, third capacitance,
Four capacitances, first resistor, second resistance, 3rd resistor；
The signal input part of the low noise amplifier circuit is connect with the first end of first inductance, first inductance
Second end connect with the first end of first capacitance, the second end of first capacitance connect with first power supply and
It is connect with the first end of the first resistor, the second end of the first resistor and the grid of first field-effect transistor connect
It connects, the source electrode of first field-effect transistor is connect with the first end of second inductance, the second end of second inductance
Ground connection, the second source are connect with the grid of the first end of second capacitance and second field-effect transistor, institute
The second end for stating the second capacitance is connect with the first end of the second resistance, the second end of second resistance ground connection, and described the
The source electrode of two field-effect transistors is connect with the drain electrode of first field-effect transistor, the leakage of second field-effect transistor
Pole is connect with the first end of the first end of the 3rd resistor and the third inductance, the second end of the 3rd resistor and institute
State the first end of third capacitance and the first end connection of the 4th capacitance, the second end of the third capacitance and described the
The second end of four capacitances is connect with the signal output end of the low noise amplifier circuit, the second end of the third inductance with it is described
Third power supply connects.
Optionally, the mixting circuit include the 4th power supply, the 5th power supply, the 4th inductance, the 5th inductance, the 6th inductance,
7th inductance, third field-effect transistor, the 4th field-effect transistor, the 5th field-effect transistor, the 6th field-effect transistor,
7th field-effect transistor, the 8th field-effect transistor, the 9th field-effect transistor, the tenth field-effect transistor, the 5th capacitance,
6th capacitance, the 7th capacitance, the 8th capacitance, the 9th capacitance, the tenth capacitance, the 4th resistance and the 5th resistance；
The grid of the third field-effect transistor and the 4th field-effect transistor is all connected with the mixting circuit sheet
Shake the input terminal of signal, the source grounding of the third field-effect transistor and the 4th field-effect transistor, and described
The drain electrode of three field-effect transistors is connect with the source electrode of the 5th field-effect transistor and the 6th field-effect transistor, and described
The drain electrode of four field-effect transistors is connect with the source electrode of the 7th field-effect transistor and the 8th field-effect transistor, and described
Five field-effect transistors, the 6th field-effect transistor, the 7th field-effect transistor and the 8th field-effect transistor grid with
The mixting circuit input signal connection；
The drain electrode of 5th field-effect transistor and the 7th field-effect transistor connects with the first end of the 4th inductance
Connect, the second end of the 4th inductance and the 5th capacitance, the 7th capacitance, the 9th capacitance, the 4th resistance, the 5th inductance the
One end connects and the drain electrode of the 9th field-effect transistor connection, the source electrode of the 9th field-effect transistor, described the
The second end of five capacitances and the second end of the 4th resistance are connect with the 4th power supply, the 7th capacitance and described
The second end of five inductance is grounded, and the second end of the 9th capacitance is the signal output end of the mixting circuit；
The drain electrode of 6th field-effect transistor and the 8th field-effect transistor connects with the first end of the 7th inductance
Connect, the second end of the 7th inductance and the 6th capacitance, the 8th capacitance, the tenth capacitance, the 5th resistance, the 6th inductance the
One end connects and the drain electrode of the tenth field-effect transistor connection, the source electrode of the tenth field-effect transistor, described the
The second end of six capacitances and the second end of the 5th resistance are connect with the 5th power supply, the 8th capacitance and described
The second end of six inductance is grounded, and the second end of the tenth capacitance is the signal output end of the mixting circuit.
Optionally, second filter circuit includes the 8th inductance, the 9th inductance, the 6th resistance, the 7th resistance, the 8th electricity
Resistance, the 9th resistance, the tenth resistance, eleventh resistor, the 11st capacitance, the 12nd capacitance, the 13rd capacitance, the 14th capacitance,
15th capacitance and the 16th capacitance；
The first end of the second filter circuit input signal, the first end of the second filter circuit output signal, institute
It states and connects between the 11st capacitance, the 8th inductance, the 6th resistance and the 7th resistance, the second filter circuit input
The second end of signal, the second end of the second filter circuit output signal, the 12nd capacitance, the 9th inductance, institute
It states and connects between the tenth resistance and the eleventh resistor, the first end of the 8th resistance is connected on the 8th inductance and described
Between 6th resistance, the second end of the 8th resistance is connect with the first end of the 9th resistance, and the of the 9th resistance
Two ends are connected between the 9th inductance and the tenth resistance, and the first end of the 13rd capacitance is connected on the 6th resistance
Between the 7th resistance, the second end of the 13rd capacitance is connect with the first end of the 15th capacitance, and described
Second end of 15 capacitances is connected between the tenth resistance and the eleventh resistor, the first end of the 14th capacitance with
The second end of 7th resistance connects, and the second end of the 14th capacitance is connect with the first end of the 16th capacitance,
The second end of 16th capacitance is connect with the second end of the 11st capacitance, the 8th resistance and the 9th resistance it
Between, be grounded between the 13rd capacitance and 15 capacitances, between the 14th capacitance and the 16th capacitance.
Optionally, the signal processing circuit further include protection circuit, the protection circuit for the antenna by
Signal processing circuit is stated in protection when predeterminated voltage.
Second aspect, the embodiment of the present application provide a kind of chip, which includes processor, power circuit and above-mentioned
The signal processing circuit that any possible realization method of first aspect or first aspect is provided.
The third aspect, the embodiment of the present application provide a kind of circuit board, which includes modem, signal processing
The chip that device and above-mentioned second aspect provide.
Fourth aspect, the embodiment of the present application provide a kind of terminal, which includes that shell and the above-mentioned third aspect provide
Circuit board.
Implement the embodiment of the present application, has the advantages that：
As can be seen that in the output end of the mixting circuit parallel connection cascade network of capacitance and inductance in the application, by simultaneously
The cascade network for joining capacitance and inductance, improves the signal-to-noise ratio of mixting circuit output signal, optimizes the performance of mixting circuit, carry
The high signal quality for receiving signal.Meanwhile the second filter circuit is provided in the application signal processing circuit, improve ADC
Processing gain, improve the sensitivity of radio-frequency transmitter.
Description of the drawings
In order to more clearly explain the technical solutions in the embodiments of the present application, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is some embodiments of the present application, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 provides a kind of schematic diagram of signal processing circuit for the embodiment of the present application；
Fig. 2 provides a kind of schematic diagram of the sound surface filtering circuit of trapezium structure for the embodiment of the present application；
Fig. 3 provides a kind of schematic diagram of the sound surface filtering circuit of lattice structure for the embodiment of the present application；
Fig. 4 provides a kind of schematic diagram of low noise amplifier circuit for the embodiment of the present application；
Fig. 5 provides a kind of schematic diagram of mixting circuit for the embodiment of the present application；
Fig. 6 provides a kind of schematic diagram of Anti-aliasing Filter Circuits for the embodiment of the present application；
Fig. 7 provides a kind of schematic diagram of possible protection circuit for the embodiment of the present application；
Fig. 8 provides a kind of possible structural schematic diagram of chip for the embodiment of the present application；
Fig. 9 provides a kind of possible structural schematic diagram of circuit board for the embodiment of the present application.
Specific implementation mode
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation describes, it is clear that described embodiment is some embodiments of the present application, instead of all the embodiments.Based on this Shen
Please in embodiment, the every other implementation that those of ordinary skill in the art are obtained without creative efforts
Example, shall fall in the protection scope of this application.
Term " first ", " second ", " third " in the description and claims of this application and the attached drawing and "
Four " etc. be for distinguishing different objects, rather than for describing particular order.In addition, term " comprising " and " having " and it
Any deformation, it is intended that cover and non-exclusive include.Such as it contains the process of series of steps or unit, method, be
The step of system, product or equipment are not limited to list or unit, but further include the steps that optionally not listing or list
Member, or further include optionally for the intrinsic other steps of these processes, method, product or equipment or unit.
Referenced herein " embodiment " is it is meant that the special characteristic, result or the characteristic that describe can wrap in conjunction with the embodiments
It is contained at least one embodiment of the application.Each position in the description occur the phrase might not each mean it is identical
Embodiment, nor the independent or alternative embodiment with other embodiments mutual exclusion.Those skilled in the art explicitly and
Implicitly understand, embodiment described herein can be combined with other embodiments.
Referring first to Fig. 1, Fig. 1 is a kind of signal processing circuit provided by the embodiments of the present application, the signal processing circuit
Radiofrequency signal for being received from antenna.As shown in Figure 1, the signal processing circuit includes：Antenna circuit 100, first filters
Circuit 200, switching circuit 300, low noise amplifier circuit 400, mixting circuit 500, the second filter circuit 600, power amplification electricity
Road 700 and A/D conversion circuits 800；
The output end of the antenna circuit 100 is connect with the input terminal of first filter circuit 200, first filtering
The output end of circuit 200 is connect with the input terminal of the switching circuit 300, the output end of the switching circuit 300 with it is described low
The input terminal of noise amplifier circuit 400 connects, the output end of the low noise amplifier circuit 400 and the mixting circuit 500
Input terminal connects, and the output end of the mixting circuit 500 is connect with the input terminal of second filter circuit 600, and described second
The output end of filter circuit 600 is connect with the input terminal of the power amplification circuit 700, the power amplification circuit 700 it is defeated
Outlet is connect with the input terminal of the A/D conversion circuits 800.
Optionally, the first filter circuit 200 can be low-pass filter circuit, and the low-pass filter circuit includes capacitance input
Formula low-pass filter circuit or input filter tances low-pass filter circuit, filter capacitor are used in power rectifier circuit, are handed over for filtering out
Ingredient is flowed, keeps the direct current of output smoother, filter inductance is small to the impedance of direct current, big to the impedance of exchange, therefore can obtain
Preferable filter effect and DC loss is small, keep the current waveform of output more smooth.The type of low-pass filtering as needed into
Row selection.
Optionally, the first filter circuit 200 is SAW filter (English：Surface Acoustic Wave, letter
Claim：SAW), which specifically has trapezium structure, T-type structure and π type structures on circuit structure.Generally, in specific electricity
Lu Zhong cascades multiple SAW to achieve the purpose that filtering.
Optionally, the switching circuit 300 can be multidiameter option switch, and the switching circuit 300 has transceiving radio frequency
The function of signal, the i.e. switching circuit 300 can receive and dispatch multiple radiofrequency signals simultaneously, we, which only discuss, here receives single channel antenna
The radiofrequency signal of circuit.
As it can be seen that using the signal processing circuit of the application, the second filter of connecting between mixting circuit and power amplification circuit
Wave circuit, second filter circuit are low cutoff frequency filter circuit, and the low frequency for filtering out the radiofrequency signal of mixting circuit output is made an uproar
Sound improves the signal-to-noise ratio of the input signal of power amplification circuit, improves the signal quality for receiving signal.Moreover, setting the
Two filter circuits improve the processing gain of ADC, improve the sensitivity of receiver.
Referring to Fig.2, Fig. 2 is a kind of sound surface filtering circuit 200 of trapezium structure provided by the embodiments of the present application.Such as Fig. 2
Shown, which includes：First filter part 201, second filter part 202, third filtering device 203 and
Four filtering devices 204.Wherein, the first filter part 201 includes capacitance C21With the first inductance L21, capacitance C21With first
Inductance L21Series connection, the second filter part 202 are capacitance C22, the first filter part 201 and the second filter part
202 compose in parallel the first parallel circuit, and the third filtering device 203 includes capacitance C23With the first inductance L22, capacitance C23With
First inductance L22Series connection, the 4th filtering device are capacitance C24, 203 and the 4th filtering device 204 of the third filtering device
Form the second parallel circuit；The first end of the first end X1 and 200 input signal of the filter circuit of first parallel circuit
Connection, the second end X2 of first parallel circuit are connect with the first end X3 of second parallel circuit, and described second is in parallel
The second end X4 of circuit is connect with the second end of 20 input signal of the filter circuit.
It is a kind of sound surface filtering circuit 20 of lattice structure provided by the embodiments of the present application refering to Fig. 3, Fig. 3.Wherein, institute
It states sound surface filtering circuit 20 to be made of two lattice circuit cascades, the surface filtering circuit 20 includes：First resonator F1,
Second resonator F2, third resonator F3, the 4th resonator F4, the 5th resonator F5, sixth resonator F6, the 7th resonator
F7, the 8th resonator F8, the 9th resonator F9 and the tenth resonator F10；The first end of the first resonator F1 and second humorous
The first end of device F2 of shaking is connected to Y1 points, and the first input end that Y1 points are the sound surface filtering circuit 20, the third
The first end of resonator F3 and the 4th resonator F4 are connected to Y2 points, and second that Y2 points are the sound surface filtering circuit 20
The second end of input terminal, the first resonator F1 and third resonator F3 are connected to Y3 points, the second resonator F2 and
The second end of 4th resonator F4 is connected to Y4 points, the 5th resonator F5, sixth resonator F6 and the 7th resonator F7
First end connect with the Y3 points, the 5th resonator F5 second ends, the 8th resonator F8 and described 9th humorous
Shake the first ends u of device F9 are connect with the Y4 points, the sixth resonator F6, the 8th resonator F8 and the tenth resonator F10
One end connect with Y5 points, one end of the 7th resonator F7, the 9th resonator F9 and the tenth resonator F10 with Y6 points
Connection, the voltage between the Y5 points and Y6 points are output voltage Vout.
As it can be seen that the surface acoustic wave filter circuit in the embodiment of the present application is lattice or trapezium structure, when radiofrequency signal passes
It transports to after inputting the filter circuit, the surface acoustic wave with input signal identical frequency, sound is produced by the resonance of piezo-electric crystal
Surface wave is propagated along piezoelectric substrate surface, and the surface acoustic wave is finally converted into electric signal output in output end, is being converted
In the process, the useful component in input signal is retained, decays and filter out useless noise signal, completely retains radiofrequency signal
Active ingredient.And the input and output impedance of surface acoustic wave is small, transmission loss is small and electromagnetism interference performance is good, can filter
Radiofrequency signal is completely preserved while wave, moreover, the reliability of the sound surface filtering circuit is high, small, light-weight.
Optionally, the switching circuit 300 is multidiameter option switch, and the switching circuit 300 includes at 4 tunnels transmitting signal
It manages circuit and 8 tunnels and receives signal processing circuit, wherein 4 road emissioning signal treatment circuit is used to emit penetrating for two frequency ranges
Frequency signal, 8 tunnel receive the radiofrequency signal that signal processing circuit is used to receive two frequency ranges.
As it can be seen that by the switching circuit in the application, multiple switch circuit is integrated into a switching circuit, improves circuit
Integrated level, and be effectively reduced the quantity of field-effect tube, saved cost of manufacture.
It is a kind of low noise amplifier circuit 400 provided by the embodiments of the present application refering to Fig. 4, Fig. 4.As shown in figure 4, described low
Noise amplifier circuit 400 includes：First power supply VCC1, second source VCC2, third power supply VCC3, the first inductance L1, the second electricity
Feel L2, third inductance L3, the first field-effect transistor T1, the second field-effect transistor T1, the first capacitance C1, the second capacitance C2,
Third capacitance C3, the 4th capacitance C4, first resistor R1, second resistance R2,3rd resistor R3；
Wherein, the first end of the signal input part Vin of the low noise amplifier circuit 300 and the first inductance L1 connects
It connects, the second end of the first inductance L1 is connect with the first end of the first capacitance C1, the second end of the first capacitance C1
It connect and is connect with the first end of the first resistor R1, the second end of the first resistor R1 with the first power supply VCC1
It is connect with the grid of the first field-effect transistor T1, source electrode and second inductance of the first field-effect transistor T1
The first end of L2 connects, the second end ground connection of the second inductance L2, the second source VCC2 and the second capacitance C2's
The grid of first end and the second field-effect transistor T2 connect, the second end of the second capacitance C2 and second electricity
Hinder the first end connection of R2, the second end ground connection of the second resistance R2, the source electrode of the second field-effect transistor T2 and institute
The drain electrode connection of the first field-effect transistor T1 is stated, the drain electrode of the second field-effect transistor T2 is with the 3rd resistor R3's
First end and the connection of the first end of the third inductance L3, the second end of the 3rd resistor R3 is with the third capacitance C3's
First end and the connection of the first end of the 4th capacitance C4, the second end of the third capacitance C3 and the 4th capacitance C4
Second end connect with the signal output end Vout of the low noise amplifier circuit 300, the second end of the third inductance L3 with
The third power supply VCC3 connections.
As it can be seen that the low noise amplifier circuit of bipolar process is used in embodiments herein, in the radio frequency that amplification receives
Signal simultaneously, reduces noise；Compared with the low noise amplifier circuit of monopole, in the case of identical bias current, the low noise
Sound amplifying circuit has high gain-bandwidth, and ADC can be made to obtain larger gain under smaller power consumption.Moreover, the low noise amplification
The negative-feedback that current sample voltage summation formula is used in circuit, when ambient temperature variation causes static working current to change,
Negative feedback mode can inhibit the increase of electric current, and the quiescent point of the low noise amplifier circuit is made to stablize.
It is a kind of mixting circuit 400 provided by the embodiments of the present application refering to Fig. 5, Fig. 5.The mixting circuit includes：4th
Power supply VCC4, the 5th power supply VCC5, the 4th inductance L4, the 5th inductance L5, the 6th inductance L6, the 7th inductance L7, third field-effect
Transistor T3, the 4th field-effect transistor T4, the 5th field-effect transistor T5, the 6th field-effect transistor T6, the 7th field-effect
Transistor T7, the 8th field-effect transistor T8, the 9th field-effect transistor T9, the tenth field-effect transistor T10, the 5th capacitance
C5, the 6th capacitance C6, the 7th capacitance C7, the 8th capacitance C8, the 9th capacitance C9, the tenth capacitance C10, the electricity of the 4th resistance R4 and the 5th
Hinder R5；
The grid G of the third field-effect transistor T3 and the 4th field-effect transistor T4 are all connected with the mixing electricity
The input terminal of road local oscillation signal RFin, the source S of the third field-effect transistor T3 and the 4th field-effect transistor T4
It is grounded, drain electrode S and the 5th field-effect transistor T5 and the 6th field effect transistor of the third field-effect transistor T3
The source S of pipe T6 connects, the drain D of the 4th field-effect transistor T4 with the described 7th field-effect transistor T7 and the 8th
The source S of effect transistor T8 connects, the 5th field-effect transistor T5, the 6th field-effect transistor T6, the 7th field-effect
The grid G of transistor T7 and the 8th field-effect transistor T8 are connect with 500 input signal of the mixting circuit；
The of the drain D of the 5th field-effect transistor T5 and the 7th field-effect transistor T7 and the 4th inductance L4
One end connects, second end and the 5th capacitance C5, the 7th capacitance C7, the 9th capacitance C9, the 4th electricity of the 4th inductance L4
Hinder R4, the first end connection of the 5th inductance L5 and the drain D connection of the 9th field-effect transistor T9, the 9th effect
Answer the source S, the second end of the 5th capacitance C5 and the second end and the described 4th of the 4th resistance R4 of transistor T9
The second end of power supply VCC4 connections, the 7th capacitance C7 and the 5th inductance L5 are grounded, and the second of the 9th capacitance C9
End is the signal output end Vout of the mixting circuit 500；
The of drain electrode S and the 7th inductance L7 of the 6th field-effect transistor T6 and the 8th field-effect transistor T8
One end connects, second end and the 6th capacitance C6, the 8th capacitance C8, the tenth capacitance C10, the 5th electricity of the 7th inductance L7
The drain D for hindering R5, the first end connection of the 6th inductance L6 and the tenth field-effect transistor T10 connects, the described ten
The second end of the source S of effect transistor T10, the second end of the 6th capacitance C6 and the 5th resistance R5 and described the
The second end of five power supply VCC5 connections, the 8th capacitance T8 and the 6th inductance L6 is grounded, and the of the tenth capacitance T10
Two ends are the signal output end of the mixting circuit 500.
As can be seen that in the output end shunt capacitance of the mixting circuit and the cascade network of inductance, effectively raises and penetrate
The signal quality of frequency signal, reduces noise, improves the quality for receiving signal.
Refering to Fig. 6, Fig. 6 is a kind of second filter circuit 600 provided by the embodiments of the present application.As shown in fig. 6, described second
Filter circuit 600 is Anti-aliasing Filter Circuits, and the Anti-aliasing Filter Circuits carry out cascade structure by multiple RC low-pass filter circuits
At.Second filter circuit 600 includes：8th inductance L8, the 9th inductance L9, the 6th resistance R6, the 7th resistance R7, the 8th electricity
Hinder R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, the 11st capacitance C11, the 12nd capacitance C12, the 13rd
Capacitance C13, the 14th capacitance C14, the 15th capacitance C15 and the 16th capacitance C16；
Wherein, the first end of second filter circuit, 600 input signal Vin, second filter circuit 600 output letter
Between the first end of number Vin, the 11st capacitance C11, the 8th inductance L8, the 6th resistance R6 and the 7th resistance R7
Series connection, the second end of second filter circuit, 600 input signal Vin, second filter circuit, 600 output signal Vin
Second end, the 12nd capacitance C12, the 9th inductance L9, the tenth resistance L10 and the eleventh resistor L11 it
Between connect, between the first end and the second end of the input signal Vin of second filter circuit, 600 input signal Vin
8th resistance R8 and the 9th resistance R9 series connection, 13 electricity between the 6th resistance R6 and the tenth resistance R10 output ends
Hold C13 and the 15th capacitance C15 series connection, the 14th capacitance C14 between the 7th resistance R7 and the eleventh resistor R11
With the 16th capacitance C16 series connection, between the 8th resistance R8 and the 9th resistance 89, the electricity of the 13rd capacitance C13 and 15
It is grounded between appearance C15, between the 14th capacitance C14 and the 16th capacitance C16.
As it can be seen that Anti-aliasing Filter Circuits in the embodiment of the present application in parallel multiple resistance and capacitance, by filtering at many levels
Wave processing, has filtered out the noise except radio frequency signal frequency, moreover, being improved by way of plural parallel stage capacitance resistance anti-aliasing
The precision of the cutoff frequency of filtering, the sample frequency of the radiofrequency signal of reservation are greater than or equal to the highest frequency of twice of signal spectrum,
When ensure that sampling will not overlap sampling, can precisely restore the raw information of radiofrequency signal, accurately sampling letter is provided for ADC
Number, the gain of ADC is improved, the sensitivity of radio-frequency transmitter is improved.
It is a kind of protection circuit 700 provided by the embodiments of the present application refering to Fig. 7, Fig. 7.As shown in fig. 7, the protection circuit
700 for the signal processing circuit when antenna is by predeterminated voltage for providing protection, which includes：Resistance
R81, resistance R82, resistance R83, resistance R84, resistance R85, resistance R86, the first voltage-stabiliser tube D1, the second voltage-stabiliser tube D2, third are steady
Pressure pipe D3, the 4th voltage-stabiliser tube D4, the 5th voltage-stabiliser tube D5, silicon-controlled D6, capacitance C81, capacitance C82, capacitance C83, inductance L81, electricity
Feel L82, inductance L83, inductance L84, inductance L85, inductance L86, bandstop filter 709, electrostatic detection unit 712, vent unit
711, transistor T81 and the 6th power supply VCC6；
The output end that the first end of the 5th resistance R81 passes through the bandstop filter 709 and the antenna circuit 701
It is connected, the second end of the resistance R81 is connected with the first end of the anode D1 of first voltage-stabiliser tube, resistance R82, described
The minus earth of first voltage-stabiliser tube D1, the second end of the resistance R82 are connect with the anode of the second voltage-stabiliser tube D2, and described
The first end of the minus earth of two voltage-stabiliser tube D2, the resistance R83 passes through the bandstop filter 709 and the antenna circuit
701 output end is connected, the second end of the resistance R83 and the first end of the resistance R84, the anode of the 4th voltage-stabiliser tube D4
It is connected, the minus earth of the 4th voltage-stabiliser tube D4, the anode of the second end of the resistance R84 and the third voltage-stabiliser tube D3
It is connected, the minus earth of the third voltage-stabiliser tube D3, the output of the first end and the antenna circuit 701 of the inductance L81
End is connected, and the second end of the inductance L81 is connected with the anode of the 5th voltage-stabiliser tube D5, the 5th voltage-stabiliser tube D5's
The first end of cathode and the resistance R85, first end and the electricity of the second end of the resistance R85 with the inductance L82
Hinder one end connection of R86, the second end ground connection of the resistance R86, the second end of the inductance L82 and electricity be described to hold the of C81
The grid connection of one end, the first end of capacitance C82, the first end of inductance L83, transistor T81, the second end of the capacitance C81
The second end of ground connection, the second end of the capacitance C82 and the inductance L83 is connect with the MCU, the drain electrode of transistor T81 and
The second end of inductance L84 connects, and the first end of inductance L82 is connect with power supply VCC6, the source electrode of the transistor T81 and it is described can
The control pole connection of silicon D6 is controlled, the anode of the silicon-controlled D6 is connected with the second end of the inductance L85, the inductance L85
First end connect with switching circuit 703, the minus earth of the silicon-controlled D6, the MCU passes through the bandstop filter 709
Be connected with the electrostatic detection unit 712 with the output end of first filter circuit 802, the MCU by capacitance C83 and
The filter circuit of the inductance L86 compositions is connected with the switching circuit 703, and the MCU passes through the electrostatic detection unit
712, bandstop filter 709 and the output end of switching circuit 703, the output end of low noise amplifier circuit 704, mixting circuit 705
Output end, the output end 706 of the second filter circuit, the output end 707 of power amplification circuit connected with D/A conversion circuits, institute
The first end for stating vent unit 711 is connected with the signal processing circuit, the second end ground connection of the vent unit 711, institute
MCU is stated with vent unit 711 to be connected.
The operation principle of above-mentioned protection circuit 700 is, described default when signal processing circuit is encountered higher than predeterminated voltage
Voltage is the maximum voltage that the signal processing circuit can be born, which is determined by signal processing circuit itself, described
The blanking voltage of the D1 in circuit 700 is protected to be less than the predeterminated voltage, the band resistance of the bandstop filter 709 is signal processing electricity
Transmitting or reception letter of this bandstop filter 709 for preventing signal processing circuit is arranged in the frequency range of the signal of Lu Suoneng processing
Number from the branch be lost in, to reduce the performance of signal processing circuit, the electricity of antenna circuit output end in signal processing circuit
Pressure higher than the predeterminated voltage when, the predeterminated voltage make D1, D2, D3, D4 and D5 be connected, to the predeterminated voltage into
Row release, protection such as is made to signal processing circuit, by the way that D1, D2 and D3, D4 are arranged in parallel, signal processing circuit by
To when heavy current can promotion signal processing circuit to the effect of releasing of the electric current, first order protection is provided, the resistance is avoided
R81, resistance R82, resistance R83, resistance R84, resistance R85, the power on resistance R86 are excessive, and high exoergic phenomenon occur, to
Damage protection circuit；
Further, possible aforementioned leadage circuit fails to release completely to voltage, has portion of electrical current to puncture the first filtered electrical
Road 702 reaches the switching circuit 703, and the second level is arranged herein and protects, and after D5 conductings, MCU detects transistor
There are when voltage, directly control the switching circuit 703 to be fully disconnected (with all transmitting paths and reception at the grid of T81
Access disconnects), while after filter network of the voltage by the L82 and C83 compositions, biasing is provided for the transistor T81
Voltage so that the conducting of the transistor T81 makes to which the source electrode of transistor T81 provides control voltage for the silicon-controlled D6
Silicon-controlled D6 conductings are obtained, are released to electric current, to realize that the second level is protected；
The also controllable electrostatic detection units of MCU are detected the electrostatic in signal processing circuit, reach pre- in the electrostatic
If when voltage, the predeterminated voltage be electrostatic can discharge voltage, control vent unit the electrostatic in signal processing circuit is let out
It puts, to reach the protection to signal processing circuit；
MCU can also be detected the charge in the environment residing for internet-of-things terminal by charge detection sensor, and inspection is worked as
When measuring intensive charge, it can determine whether out that the region may have highfield or will will appear thunder-strike phenomenon, then directly control out
Powered-down road is fully disconnected, and can avoid the presence damage to the component after switching circuit after strong voltage enters circuit to a certain degree
Bad possibility, to achieve the purpose that protect to internet-of-things terminal.
A kind of chip is provided in another embodiment of the application, which includes signal processing as described in Figure 1 electricity
Road also includes power supply and processor.Referring to Fig. 8, a kind of possible structure that Fig. 8 provides chip for the embodiment of the present application is shown
It is intended to.As shown in figure 8, chip includes：Power circuit 801, processor 802 and rf signal reception circuit 803.Above-mentioned power supply electricity
Its major function of road 801 to provide power supply to the chip, above-mentioned processor 802 for example can be for example can be central processing unit
(Central Processing Unit, CPU), general processor, digital signal processor (Digital Signal
Processor, DSP), application-specific integrated circuit (Application-Specific Integrated Circuit, ASIC) is existing
Field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, hardware
Component or its arbitrary combination, rf signal reception circuit 803 are the either circuit described in above-described embodiment.
Another embodiment of the embodiment of the present application provides a kind of circuit board, which includes modem, base band
The chip provided in signal processor and above-described embodiment.Referring to Fig. 9, Fig. 9 provides circuit board for the embodiment of the present application
A kind of possible structural schematic diagram.As shown in figure 9, the circuit board includes：Modem 110, signal processor 120, chip
130 and bus 140.Modem 110, signal processor 120, chip 130 are connected by bus 140.Modem 110
Mainly for the treatment of wireless signal by treated the baseband signal of chip 130, signal processor 120 is mainly for the treatment of process
Signal after the demodulation of modem 110, chip 130 are mainly used for being handled radio frequency signal to obtain baseband signal.
Provide a kind of internet-of-things terminal in another embodiment of the application, the internet-of-things terminal include foregoing circuit plate and
Shell.
Above specific implementation mode has carried out into one the purpose, technical solution and advantageous effect of the embodiment of the present application
Step is described in detail, it should be understood that these are only the specific implementation mode of the embodiment of the present application, is not used to limit this
Apply for that the protection domain of embodiment, all any modifications on the basis of the technical solution of the embodiment of the present application, made are equal
Replace, improve etc., it should all be included within the protection domain of the embodiment of the present application.
Claims (10)
1. a kind of signal processing circuit, which is characterized in that the signal processing circuit includes：Antenna circuit, the first filter circuit,
Switching circuit, low noise amplifier circuit, mixting circuit, the second filter circuit, power amplification circuit and A/D conversion circuits；
The output end of the antenna circuit is connect with the input terminal of first filter circuit, the output of first filter circuit
End is connect with the input terminal of the switching circuit, the input terminal of the output end of the switching circuit and the low noise amplifier circuit
Connection, the output end of the low noise amplifier circuit are connect with the input terminal of the mixting circuit, the output of the mixting circuit
End is connect with the input terminal of second filter circuit, output end and the power amplification circuit of second filter circuit
Input terminal connects, and the output end of the power amplification circuit is connect with the input terminal of the A/D conversion circuits.
2. signal processing circuit according to claim 1, which is characterized in that first filter circuit includes：First filter
Wave device, second filter part, third filtering device and the 4th filtering device；
The first filter part and the second filter part compose in parallel the first parallel circuit, the third filtering device with
4th filtering device composes in parallel the second parallel circuit, the first end of first parallel circuit and first filtered electrical
The first end of road input signal connects, and the second end of first parallel circuit and the first end of second parallel circuit connect
It connects, the second end of second parallel circuit is connect with the second end of the first filter circuit input signal；
The first end of second parallel circuit and two ports of the second end as the first filter circuit output signal.
3. signal processing circuit according to claim 1 or 2, which is characterized in that the switching circuit is opened for multi-path choice
It closes, the switching circuit includes that 4 road emissioning signal treatment circuits and 8 tunnels receive signal processing circuit, wherein the 4 tunnel transmitting
Signal processing circuit is used to emit the radiofrequency signal of two frequency ranges, and 8 tunnel receives signal processing circuit for receiving two frequencies
The radiofrequency signal of section.
4. according to claim 1-3 any one of them signal processing circuits, which is characterized in that the low noise amplifier circuit packet
Include the first power supply, second source, third power supply, the first inductance, the second inductance, third inductance, the first field-effect transistor, second
Field-effect transistor, the first capacitance, the second capacitance, third capacitance, the 4th capacitance, first resistor, second resistance, 3rd resistor；
The signal input part of the low noise amplifier circuit is connect with the first end of first inductance, and the of first inductance
Two ends are connect with the first end of first capacitance, the second end of first capacitance connect with first power supply and with institute
The first end connection of first resistor is stated, the second end of the first resistor is connect with the grid of first field-effect transistor,
The source electrode of first field-effect transistor is connect with the first end of second inductance, the second termination of second inductance
Ground, the second source is connect with the grid of the first end of second capacitance and second field-effect transistor, described
The second end of second capacitance is connect with the first end of the second resistance, the second end ground connection of the second resistance, and described second
The source electrode of field-effect transistor is connect with the drain electrode of first field-effect transistor, the drain electrode of second field-effect transistor
Connect with the first end of the first end of the 3rd resistor and the third inductance, the second end of the 3rd resistor with it is described
The first end of third capacitance and the connection of the first end of the 4th capacitance, the second end of the third capacitance and the described 4th
The second end of capacitance is connect with the signal output end of the low noise amplifier circuit, the second end of the third inductance and described the
Three power supplys connect.
5. signal processing circuit according to claim 1, which is characterized in that the mixting circuit includes the 4th power supply, the
Five power supplys, the 4th inductance, the 5th inductance, the 6th inductance, the 7th inductance, third field-effect transistor, the 4th field-effect transistor,
5th field-effect transistor, the 6th field-effect transistor, the 7th field-effect transistor, the 8th field-effect transistor, the 9th effect
Answer transistor, the tenth field-effect transistor, the 5th capacitance, the 6th capacitance, the 7th capacitance, the 8th capacitance, the 9th capacitance, the tenth electricity
Appearance, the 4th resistance and the 5th resistance；
The grid of the third field-effect transistor and the 4th field-effect transistor is all connected with the mixting circuit local oscillator letter
Number input terminal, the source grounding of the third field-effect transistor and the 4th field-effect transistor, the third field
The drain electrode of effect transistor is connect with the source electrode of the 5th field-effect transistor and the 6th field-effect transistor, described 4th
The drain electrode of effect transistor is connect with the source electrode of the 7th field-effect transistor and the 8th field-effect transistor, described 5th
Effect transistor, the 6th field-effect transistor, the 7th field-effect transistor and the 8th field-effect transistor grid with it is described
Mixting circuit input signal connects；
The drain electrode of 5th field-effect transistor and the 7th field-effect transistor is connect with the first end of the 4th inductance, institute
State the first end of the second end and the 5th capacitance, the 7th capacitance, the 9th capacitance, the 4th resistance, the 5th inductance of the 4th inductance
Connection and the drain electrode of the 9th field-effect transistor connection, the source electrode of the 9th field-effect transistor, the 5th electricity
The second end of appearance and the second end of the 4th resistance are connect with the 4th power supply, the 7th capacitance and the 5th electricity
The second end of sense is grounded, and the second end of the 9th capacitance is the signal output end of the mixting circuit；
The drain electrode of 6th field-effect transistor and the 8th field-effect transistor is connect with the first end of the 7th inductance, institute
State the first end of the second end and the 6th capacitance, the 8th capacitance, the tenth capacitance, the 5th resistance, the 6th inductance of the 7th inductance
Connection and the drain electrode of the tenth field-effect transistor connection, the source electrode of the tenth field-effect transistor, the 6th electricity
The second end of appearance and the second end of the 5th resistance are connect with the 5th power supply, the 8th capacitance and the 6th electricity
The second end of sense is grounded, and the second end of the tenth capacitance is the signal output end of the mixting circuit.
6. signal processing circuit according to claim 1 or 5, which is characterized in that second filter circuit includes the 8th
Inductance, the 9th inductance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, the 11st
Capacitance, the 12nd capacitance, the 13rd capacitance, the 14th capacitance, the 15th capacitance and the 16th capacitance；
The first end of the second filter circuit input signal, the first end of the second filter circuit output signal, described
It connects between 11 capacitances, the 8th inductance, the 6th resistance and the 7th resistance, the second filter circuit input signal
Second end, the second end of the second filter circuit output signal, the 12nd capacitance, the 9th inductance, described
It connects between ten resistance and the eleventh resistor, the first end of the 8th resistance is connected on the 8th inductance and the described 6th
Between resistance, the second end of the 8th resistance is connect with the first end of the 9th resistance, the second end of the 9th resistance
It is connected between the 9th inductance and the tenth resistance, the first end of the 13rd capacitance is connected on the 6th resistance and institute
Between stating the 7th resistance, the second end of the 13rd capacitance is connect with the first end of the 15th capacitance, and the described 15th
Second end of capacitance is connected between the tenth resistance and the eleventh resistor, the first end of the 14th capacitance with it is described
The second end of 7th resistance connects, and the second end of the 14th capacitance is connect with the first end of the 16th capacitance, described
The second end of 16th capacitance is connect with the second end of the 11st capacitance, between the 8th resistance and the 9th resistance, institute
It states between the 13rd capacitance and 15 capacitances, be grounded between the 14th capacitance and the 16th capacitance.
7. according to claim 1-6 any one of them signal processing circuits, which is characterized in that the signal processing circuit is also wrapped
Protection circuit is included, the protection circuit is used for the protection when the antenna is by predeterminated voltage and states signal processing circuit.
8. a kind of chip, which is characterized in that the chip includes described in processor, power circuit and claim any one of 1-7
Signal processing circuit.
9. a kind of circuit board, which is characterized in that the circuit board includes modem, signal processor and claim 8 institute
The chip stated.
10. a kind of internet-of-things terminal, which is characterized in that the internet-of-things terminal includes the circuit described in shell and claim 9
Plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810438580.0A CN108736909A (en) | 2018-05-09 | 2018-05-09 | The radio circuit and terminal of SAW filter combination anti aliasing purposes filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810438580.0A CN108736909A (en) | 2018-05-09 | 2018-05-09 | The radio circuit and terminal of SAW filter combination anti aliasing purposes filter |
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| CN108736909A true CN108736909A (en) | 2018-11-02 |
Family
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| CN201810438580.0A Pending CN108736909A (en) | 2018-05-09 | 2018-05-09 | The radio circuit and terminal of SAW filter combination anti aliasing purposes filter |
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| CN109510604A (en) * | 2018-11-13 | 2019-03-22 | 上海艾为电子技术股份有限公司 | A kind of filter circuit applied to radio-frequency front-end |
| CN109802651A (en) * | 2019-02-26 | 2019-05-24 | 上海龙旗科技股份有限公司 | Surface acoustic wave filter and electronic product |
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Application publication date: 20181102 |