CN106888029A - A kind of receiver for omitting piece outer filter - Google Patents
A kind of receiver for omitting piece outer filter Download PDFInfo
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- CN106888029A CN106888029A CN201710034055.8A CN201710034055A CN106888029A CN 106888029 A CN106888029 A CN 106888029A CN 201710034055 A CN201710034055 A CN 201710034055A CN 106888029 A CN106888029 A CN 106888029A
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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
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
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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
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- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
This application discloses a kind of receiver for omitting piece outer filter, from antenna next coming in order matching connection network, passive filter, baseband amplifier and wave filter.The matching network is inductively or capacitively made up of one or more.The passive filter has multiple passages in parallel, and each passage is in series by a switching tube and a sampling capacitance, and switching tube in each passage controls its on or off by a carrier signal；The high level pulse of these carrier signals is not overlapped；During the high level pulse of certain carrier signal, the switching tube controlled by the carrier signal is turned on, and rest switch pipe is turned off.The baseband amplifier and wave filter further amplify and filter to the intermediate frequency or baseband signal after down coversion.The application eliminates piece outer surface acoustic wave filter, realizes the relatively low noise coefficient of receiver, improves and filter the ability with external blocking, improves the linearity, eliminates the trade-off relation of input matching and baseband amplifier.
Description
Technical field
The application is related to a kind of radio-frequency transmitter, radio-frequency front-end more particularly to therein.
Background technology
Transceiver (transceiver) includes emitter (transmitter) and receiver (receiver).Receiver
Radio-frequency front-end (RF front end) typically refers to the circuit between antenna to frequency mixer, including frequency mixer.For 2G, 3G,
In the CMOS radio frequency transceivers of the mobile communication such as 4G, the high-power signal that emitter is produced can in several ways be coupled to reception
Machine, so that receiver faces the risk of saturation.Meanwhile, the signal that antenna is received also is often associated with powerful obstruction letter
Number, can equally make the saturation of receiver.In order to lift receiver to the inhibition with external blocking, existing some existing receivers
Radio-frequency front-end scheme is suggested.
In April, 2011《IEEE solid-state circuit magazines》(IEEE Journal of Solid-State Circuits)
There is an article phase of volume 46 the 4th《For the frequency saw-less receiver on-chip systems of 65nm CMOS tetra- of GSM/GPRS/EDGE》
(A 65nm CMOS Quad-Band SAW-Less Receiver SoC for GSM/GPRS/EDGE), the I of this article
Part discloses a kind of traditional receiver radio frequency front end, as shown in Figure 1.The radio-frequency front-end is in the outside of on-chip system (SoC)
With multiple surface acoustic waves (SAW) wave filter, it is respectively intended to be filtered different communication bands.The shortcoming of the program is
The volume of piece outer filter is big and price.
In December, 2010《IEEE solid-state circuit magazines》There is an article the 12nd phase of volume 45《With digital control and width
Passive with tunable radio frequency interface is first mixed receiver》(A Passive Mixer-First Receiver With
Digitally Controlled and Widely Tunable RF Interface), the part ii of this article,
III parts disclose a kind of receiver, as shown in Figure 2.The receiver is directly connected to antenna with passive frequency mixer, eliminates radio frequency
Wave filter, RF impedance matching network and radio frequency low-noise amplifier (LNA).After radiofrequency signal is received by the antenna, first pass through
Passive frequency mixer is down-converted to baseband signal, then is amplified by base band low-noise amplifier.This article also analyzes passive mixing
Device has good inhibition, therefore this receiver with frequency mixer as the first order for down coversion with external blocking signal
With the linearity very high.The shortcoming of the program is have two.First, due to eliminating low-noise amplifier so as to be mixed
Device is poor for the noise coefficient of the receiver of the first order, causes system sensitivity to deteriorate.Second, base band low-noise amplifier
Output signal to passive frequency mixer uses the input impedance of current sample, baseband amplifier to be upconverted to by passive frequency mixer
The input of passive frequency mixer, the input that radiofrequency signal is provided together with the equivalent conducting resistance of passive frequency mixer is matched, therefore
Input matching and the design of baseband amplifier need mutually compromise.Identical technical scheme is also documented in application publication number
CN102845126A, Shen Qing Publication day are the Chinese invention patent application on December 26 in 2012《Wireless Telecom Equipment and system》
In.
Application publication number is CN103546176A, Shen Qing Publication day is the Chinese invention patent application on January 29 in 2014
《Wireless receiver and its signal processing method》In, 0066 section of its specification, 0067 section describe a kind of low-power radio and connect
Receipts machine, as shown in Figure 3.The receiver is sequentially connected match circuit, buffer, frequency mixer from antenna, and match circuit realizes input
Impedance matching, buffer realizes that impedance is isolated, and frequency mixer realizes the down coversion of radiofrequency signal.The shortcoming of the program is what is introduced
Buffer can increase extra power consumption, can also introduce noise and cause signal attenuation.Simultaneously because buffer itself is non-linear,
The signal to noise ratio of signal can also be reduced.
The content of the invention
Technical problems to be solved in this application be to provide it is a kind of omit piece outer filter receiver, using in piece (i.e.
On piece) filter structure filter the band external blocking letter received from the emitter transmission signal that comes of coupling or from antenna
Number, so as to lift the linearity of receiver and reduce noise.
In order to solve the above technical problems, the receiver for omitting piece outer filter that the application is provided connects from antenna next coming in order
Connect matching network, passive filter, baseband amplifier and wave filter.The matching network is by one or more inductively or capacitively groups
Into realizing input resistant matching to the radiofrequency signal that antenna is received while carrying out pre-amplification.The passive filter has simultaneously
Multiple passages of connection, each passage is in series by a switching tube and a sampling capacitance, and opening in each passage
Close pipe and its on or off is all controlled by a carrier signal；The high level pulse of these carrier signals is not overlapped；At certain
During the high level pulse of individual carrier signal, the switching tube controlled by the carrier signal is turned on, and rest switch pipe is turned off；It is in office
Meaning moment, the input signal of passive filter passes through from only one passage in multiple passages in parallel, by the sampling of the passage
Intermediate frequency or baseband signal after electric capacity sampling after the output end of passive filter obtains down coversion.The baseband amplifier and filter
Ripple device further amplifies and filters to the intermediate frequency or baseband signal after down coversion.Preferably, the matching network, passive filtering
Device, baseband amplifier and wave filter are realized all on piece.
In embodiment one, the matching network includes the electric capacity one and inductance one of series connection；The first end conduct of electric capacity one
The input of matching network, receives the radiofrequency signal from antenna；Second end of electric capacity one is connected with the first end of inductance one,
As the output end of matching network；The second end ground connection of inductance one.
In embodiment two, the matching network includes electric capacity one, inductance two, inductance three, electric capacity two and electric capacity three；Electric capacity
One first end receives the radiofrequency signal from antenna as the input of matching network；Between second end of electric capacity one and ground
It is parallel with inductance two, inductance three, electric capacity two and electric capacity three；Second end of electric capacity one as matching network output end；Electric capacity two
It is tunable capacitor.Electric capacity three be switching tube in passive filter at the node to ground parasitic capacitance.
In embodiment three, the matching network includes electric capacity one, inductance one, electric capacity two and electric capacity three；The of electric capacity one
One end receives the radiofrequency signal from antenna as the input of matching network；It is parallel between second end of electric capacity one and ground
Inductance one, electric capacity two and electric capacity three；Second end of electric capacity one as matching network output end；Electric capacity two is tunable capacitor；Electricity
Hold three be switching tube in passive filter at the node to ground parasitic capacitance.
In example IV, the matching network includes electric capacity one, electric capacity four, inductance four, electric capacity two and electric capacity three；Electric capacity
One first end receives the radiofrequency signal from antenna as the input of matching network；Second end of electric capacity one and electric capacity four
First end be connected, the second end of electric capacity four ground connection；Second end of electric capacity one also connects the first of electric capacity two by inductance four
End and the first end of electric capacity three, the first end of electric capacity two and the first end of electric capacity three as matching network output end；Electric capacity two
The second end ground connection；The second end ground connection of electric capacity three；Electric capacity two and electric capacity four are tunable capacitors；During electric capacity three is passive filter
Switching tube at the node to ground parasitic capacitance.
More than in each embodiment, passive filter and matching network collective effect, in the output end shape of matching network
Into a wave filter, for filtering band external blocking signal that is being come by emitter coupling or being received by antenna.
What the application was obtained has the technical effect that the receiver for realizing and omitting piece outer surface acoustic wave filter, realizes relatively low
Noise coefficient, improve and filter the ability with external blocking signal, so as to improve the linearity, eliminate input matching and base band
The trade-off relation of amplifier.
Brief description of the drawings
Fig. 1 is a kind of structural representation of traditional receiver radio frequency front end.
Fig. 2 is a kind of structural representation of the receiver of existing use passive frequency mixer.
Fig. 3 is a kind of structural representation of the existing receiver with match circuit and buffer.
Fig. 4 is the structural representation of the embodiment one of the receiver of the omission piece outer filter that the application is provided.
Fig. 5 is the schematic diagram of N number of local oscillation signal of the N channel passive filter in Fig. 4.
Fig. 6 is the structural representation of the embodiment two of the receiver of the omission piece outer filter that the application is provided.
Fig. 7 is the structural representation of the embodiment three of the receiver of the omission piece outer filter that the application is provided.
Fig. 8 is the structural representation of the example IV of the receiver of the omission piece outer filter that the application is provided.
Fig. 9 is the schematic equivalent circuit one of the receiver of the omission piece outer filter that the application is provided.
Figure 10 is the schematic equivalent circuit two of the receiver of the omission piece outer filter that the application is provided.
Figure 11 is the simulation result figure of the gain with frequency relation of the receiver that the application is provided.
Figure 12 is the simulation result of rf gain and S11 with frequency relation of the embodiment two of the receiver that the application is provided
Figure.
Figure 13 is the emulation knot of conversion gain and two-sided cells with frequency relation of the receiver that the application is provided
Fruit is schemed.
Description of reference numerals in figure：T is switching tube；C is electric capacity；L is inductance；R is resistance.
Specific embodiment
Fig. 4 is referred to, this is the embodiment one of the receiver of the omission piece outer filter that the application is provided.The embodiment one
Shown receiver includes matching network, passive filter, baseband amplifier and wave filter from antenna next coming in order.The matching
Network includes the C1 of electric capacity one and the L1 of inductance one of series connection.The first end of the C1 of electric capacity one is received and as the input of matching network
From the radiofrequency signal of antenna.Second end of the C1 of electric capacity one is connected with the first end of the L1 of inductance one, used as the output of matching network
End.The second end ground connection of the L1 of inductance one.The passive filter has N number of passage in parallel, and each passage is by a switch
Pipe TNWith a sampling capacitance CLNIt is in series, and the switch transistor T in each passageNAll by a carrier signal LONControl it
On or off.Refer to Fig. 5, the N number of switch transistor T in N number of passage of passive filterNBy N number of different carrier signal LO1
To LONControl respectively, this N number of carrier signal LO1To LONFor example produced by N number of local oscillator.Preferably, this N number of carrier wave letter
Number LO1To LONCycle phase it is same, dutycycle is also identical, and the high level pulse of any two carrier signal is not overlapped.
During the high level pulse of certain carrier signal, the switching tube controlled by the carrier signal is turned on, and rest switch pipe is turned off.
Therefore at any time, the input signal of passive filter passes through from only one passage in N number of passage in parallel, by the passage
Sampling capacitance sampling after intermediate frequency after the output end of passive filter obtains down coversion or baseband signal.
In above-described embodiment one, the radiofrequency signal that antenna is received is sent to matching network first.Matching network realizes input
The matching of impedance, while also being prevented radiofrequency signal greatly so as to the noise to late-class circuit has certain suppression.Matching network
The radiofrequency signal of output is sent to passive filter, and passive filter is in parallel with the L1 of inductance one in matching network, in pair net
The output end of network forms a wave filter for high quality factor, for filtering being come by emitter coupling or being received by antenna
Band external blocking signal.Passive filter also carries out time sharing sampling by N number of passage, and radiofrequency signal is down-converted into intermediate frequency or base
Band signal, is sent to baseband amplifier and wave filter.By the sampling capacitance for adjusting each parallel port in passive filter
Capacitance size, thus it is possible to vary the bandwidth of passive filter.Baseband amplifier and wave filter are to the intermediate frequency or base band after down coversion
Signal further amplifies and filters.
In above-described embodiment one, matching network, passive filter, baseband amplifier and wave filter are real preferably all on piece
It is existing.In order to realize impedance matching at some working frequencies, the L1 of inductance one needs using larger inductance value matching network therein,
It is unfavorable for being realized on piece.
Fig. 6 is referred to, this is the embodiment two of the receiver of the omission piece outer filter that the application is provided.The embodiment two
Matching network is differed only in embodiment one.Matching network in the embodiment two includes what first end was connected with antenna
The L2 of inductance two, the L3 of inductance three, the C2 of electric capacity two and the C3 of electric capacity three are parallel between second end and ground of the C1 of electric capacity one, the C1 of electric capacity one.
The C2 of electric capacity two is tunable capacitor.The C3 of electric capacity three be switching tube in passive filter at the node to ground parasitic capacitance.Electricity
Hold the first end of a C1 as the input of matching network, receive the radiofrequency signal from antenna.Make at second end of the C1 of electric capacity one
It is the output end of matching network.
In above-described embodiment two, matching network, passive filter, baseband amplifier and wave filter are real preferably all on piece
It is existing.The L1 of inductance one in embodiment one is equivalent to the L2 of inductance two, the L3 of inductance three, the C2 of tunable capacitor two of parallel connection in embodiment two
With the C3 of parasitic capacitance three.By adjusting the size of the C2 of electric capacity two, the L3 of the inductance three and C2 of electric capacity two, the triple channel parallel connection of the C3 of electric capacity three
Network can realize the resonance at signal frequency.If suitably increasing the capacitance of the C2 of electric capacity two, the inductance value of the L3 of inductance three will become
It is small to be adapted to piece realize.Because the resistance of the equivalent parallel resistance at resonant frequency is larger, this parallel network is almost
Not influenceing the original function of the function of matching network, the matching network in embodiment one can be retained in embodiment two.
Passive filter in embodiment two is with the L2 of inductance two in matching network, L3 is in parallel for inductance three, in the output end of matching network
A wave filter for high quality factor is formed, for filtering band external blocking that is being come by emitter coupling or being received by antenna
Signal.
Fig. 7 is referred to, this is the embodiment three of the receiver of the omission piece outer filter that the application is provided.The embodiment three
Matching network is differed only in embodiment one.Matching network in the embodiment three includes what first end was connected with antenna
The L1 of inductance one, the C2 of electric capacity two and the C3 of electric capacity three are parallel between second end and ground of the C1 of electric capacity one, the C1 of electric capacity one.The C2 of electric capacity two is
Tunable capacitor.The C3 of electric capacity three be switching tube in passive filter at the node to ground parasitic capacitance.The of the C1 of electric capacity one
One end receives the radiofrequency signal from antenna as the input of matching network.Second end of the C1 of electric capacity one is used as matching network
Output end.
In above-described embodiment three, matching network, passive filter, baseband amplifier and wave filter are real preferably all on piece
It is existing.Matching network in embodiment three is in parallel with the L1 of inductance one equivalent to having been increased newly on the basis of the L1 of inductance one of embodiment one
The C2 of tunable capacitor two and the C3 of parasitic capacitance three.By adjusting the size of the C2 of electric capacity two, the L1 of inductance one and the C2 of electric capacity two, electric capacity three
The parallel network of C3 can realize the resonance at signal frequency.If suitably increasing the capacitance of the C2 of electric capacity two, the sense of the L1 of inductance one
Value will be varied down to and be adapted to be realized in piece.Because the resistance of the equivalent parallel resistance at resonant frequency is larger, this is in parallel
Network has little influence on the function of matching network, and the original function of the matching network in embodiment one can be obtained in embodiment three
To reservation.Passive filter in embodiment three is in parallel with the L1 of inductance one in matching network, in the output end shape of matching network
Into a wave filter for high quality factor, for filtering being come by emitter coupling or being believed by the band external blocking that antenna is received
Number.
Fig. 8 is referred to, this is the example IV of the receiver of the omission piece outer filter that the application is provided.The example IV
Matching network is differed only in embodiment one.Matching network in the example IV includes the C1 of electric capacity one and electric capacity of series connection
Four C4, also including the L4 of inductance four, the C2 of electric capacity two and the C3 of electric capacity three.The C2 of electric capacity two and the C4 of electric capacity four are tunable capacitors.The C3 of electric capacity three
Be the switching tube in passive filter at the node to ground parasitic capacitance.The first end of the C1 of electric capacity one is used as matching network
Input, receives the radiofrequency signal from antenna.Second end of the C1 of electric capacity one is connected with the first end of the C4 of electric capacity four, electric capacity four
The second end ground connection of C4.Second end of the C1 of electric capacity one also connects the first end and the C3 of electric capacity three of electric capacity two C2 by the L4 of inductance four
First end, the first end of the C2 of electric capacity two and the first end of the C3 of electric capacity three as matching network output end.The second of the C2 of electric capacity two
End ground connection.The second end ground connection of the C3 of electric capacity three.
In above-described embodiment four, matching network, passive filter, baseband amplifier and wave filter are real preferably all on piece
It is existing.Matching network in embodiment one is L-type, and the matching network in example IV has been changed to Π types.This Π types matching network
Be not only suitable for it is integrated on piece, facilitate again outside piece realize.The integrated integrated level for improving system on piece, being realized outside piece can be using more
The inductance capacitor element of high quality factor improves the noiseproof feature of system.Meanwhile, by reasonable adjusting electricity if piece realization
Hold the capacitance of four C4 and the C2 of electric capacity two, be capable of achieving the input resistant matching of multiple frequency range.Passive filter in example IV with
Matching network is cooperatively acted on, matching network output end formed a wave filter for high quality factor, for filter by
Band external blocking signal that is that emitter coupling comes or being received by antenna.The C2 of the electric capacity two and C3 of electric capacity three is in parallel, or simultaneously
In parallel with the pad parasitic capacitance (not shown) at the node, the pad parasitic capacitance at the C4 of electric capacity four and its corresponding node is (not
Diagram) it is in parallel so that and the robustness of Π type matching networks is improved, it is possible to achieve perfect match.
All it is to cascade matching network and passive frequency mixer more than in each embodiment, this not only can be pre- to signal
Amplify so as to improve the noiseproof feature of receiver, the suppression to out-of-band interference signal can also be strengthened.Fig. 9 is referred to, this is this
The schematic equivalent circuit one of the receiver of the omission piece outer filter that application is provided.Antenna can be equivalent to ideal voltage source Vs
With the series connection of resistance Rs.Matching network is made up of capacity cell Cx and inductance component L x.The input signal of matching network is Vin,
Output signal is Vout.The N channel passive filter driven by N number of carrier wave can be equivalent to by inductance component L p, capacity cell
The LCR resonant networks of Cp and resistive element Rp compositions, while the series resistance Rsw that series connection is idealized by switching tube and come, while
Parasitic capacitance C3 of the paralleling switch pipe in the node to ground.
If equivalent circuit one shown in Fig. 9 in carrier frequency resonance, can be further simplified as shown in Figure 10 etc.
Effect circuit two.Because LCR resonant networks are in carrier frequency resonance, resistance Rp is reduced to.Passive frequency mixer is just reduced to
Resistance Rsw is connected with resistance Rp's, it is also possible to which resistance Rsw+Rp is represented.Parasitic capacitance of the switching tube in the node to ground
C3 can be absorbed into matching network.The input equivalent resistance of the matching network in Figure 10 is equal to resistance at resonant frequency
RS, simultaneously as Rp is much larger than Rs, so Vout/Vin is more than 1, i.e., the matching network has amplification to signal, so rear class
The noise of passive frequency mixer can be inhibited.Meanwhile, beyond resonant frequency, resistance Rs is converted by the impedance of matching network
After, equiva lent impedance equally becomes big so that the gain at out-of-band frequency diminishes, that is, improve the suppression to out-of-band interference signal.
Figure 11 is referred to, this is the simulation result schematic diagram of the gain with frequency relation of receiver, it is assumed that the center of carrier wave
Frequency is 1GHz.Curve one is demonstrated by the receiver of the omission piece outer filter of the application offer, but omits matching network
Situation.Second curve is demonstrated by the receiver of the omission piece outer filter of the application offer, includes the situation of matching network.Than
Compared with this two curves it can be found that when there is no matching network, due to the influence of passive frequency mixer breaker in middle pipe parasitic capacitance, causing
Centre frequency has offset.And after increasing matching network, the influence of passive frequency mixer breaker in middle pipe parasitic capacitance can be incorporated to
Realize the gain without skew so that centre frequency remains 1GHz in matching network.At centre frequency, increase matching network
The gain of 5dB can be improved afterwards.At out-of-band frequency, the suppression after increase matching network to out of band signal can improve 6dB.
Figure 12 is referred to, this is the rf gain of matching network output end in embodiment three, (input port voltage is anti-for S11
Penetrate coefficient) with the simulation result schematic diagram of frequency relation, it is assumed that the centre frequency of carrier wave is 1GHz.Curve three is demonstrated by radio frequency increasing
Benefit and frequency relation.From curve three, because matching network is to the pre-amplification of useful signal, the gain at 1GHz frequencies is
9.1dB, while the wave filter of one high quality factor of output end formation (equivalent Q-value here is 50) in matching network, from
And filter bag external blocking signal.The two ends gain of curve three all below -5dB, therefore to the suppression of out of band signal up to 15dB
Left and right, so as to avoid receiver from causing saturation by band external blocking signal.Curve four is demonstrated by S11 and frequency relation.By curve four
Understand, by rationally setting the size of the L1 of the inductance one and C2 of tunable capacitor two, can be at center under the driving of 1GHz carrier signals
Impedance matching is realized at frequency, the S11 at 1GHz frequencies is -16dB.
Figure 13 is referred to, this is the simulation result of conversion gain, two-sided cells and frequency relation in embodiment three
Schematic diagram.Curve five is demonstrated by conversion gain and frequency relation.From curve five, conversion gain is about 15dB, increases than radio frequency
Beneficial high 6dB, because intermediate frequency or base band are differential signal, and radiofrequency signal is the reason of single-ended signal.Curve six is showed
Two-sided cells and frequency relation.From curve six, because having pre-amplification of the matching network to signal, receiver system
System can realize the noise coefficient of very little.Curve six is displayed in the range of the signal bandwidth within 10MHz, and whole noise coefficient is small
In 3dB.
The receiver of omission piece outer filter provided herein has the advantages that.
First, piece outer filter need not be used, worked by passive frequency mixer and matching network one and constitute a wave filter,
For filtering band external blocking signal.
Second, increased matching network before passive frequency mixer, the matching network not only realizes input resistant matching, also
Pre-amplification is carried out to signal, so as to the linearity to suppression noise, lifting receiver has certain effect.The matching network also makes
The input (i.e. the output end of matching network) for obtaining passive frequency mixer is presented high impedance, and this equivalent high impedance connected with passive is mixed
Frequency device causes that the decay of out of band signal becomes big, that is, improve to the suppression with external blocking signal, as shown in figure 11.
Third, the output end of matching network is directly connected to the input of passive frequency mixer, without using therebetween
Buffer, thus whole receiver is reduced power consumption and improve noiseproof feature.
Fourth, baseband amplifier and wave filter use voltage sample to the signal of down coversion, input matching and base are eliminated
The trade-off relation of provided with processor, input matching does not change because BBP changes, at the same it is also unrelated with input signal size,
Make the realization of baseband amplifier and wave filter more flexible.For the baseband amplifier of current sample, its equivalent input impedance compared with
It is small, can together provide input matching, Gu Huixiang by the conducting resistance that passive frequency mixer upconverts to rf inputs and switching tube
It is mutually compromise.For the baseband amplifier of voltage sample, its equivalent input impedance is larger, can be equivalent to the parasitism electricity of certain capacitance
Hold, this parasitic capacitance is in parallel with the capacitive load of switching tube, eliminates above-mentioned trade-off relation.
The preferred embodiment of the application is these are only, is not used to limit the application.Come for those skilled in the art
Say, the application there can be various modifications and variations.It is all any modifications within spirit herein and principle, made, equivalent
Replace, improve etc., should be included within the protection domain of the application.
Claims (10)
1. it is a kind of omit piece outer filter receiver, it is characterized in that, from antenna next coming in order matching connection network, passive filtering
Device, baseband amplifier and wave filter；
The matching network is inductively or capacitively made up of one or more, and input impedance is realized to the radiofrequency signal that antenna is received
Matching carries out pre-amplification simultaneously；
The passive filter has multiple passages in parallel, and each passage is connected by a switching tube and a sampling capacitance
Form, and switching tube in each passage controls its on or off by a carrier signal；The height of these carrier signals
Level pulse is not overlapped；During the high level pulse of certain carrier signal, the switching tube controlled by the carrier signal is led
Logical, rest switch pipe is turned off；At any time, the input signal of passive filter is from only in multiple passages in parallel
Passage passes through, intermediate frequency or base band after being sampled by the sampling capacitance of the passage after the output end of passive filter obtains down coversion
Signal；
The baseband amplifier and wave filter further amplify and filter to the intermediate frequency or baseband signal after down coversion.
2. it is according to claim 1 omit piece outer filter receiver, it is characterized in that, the matching network, passive filter
Ripple device, baseband amplifier and wave filter are realized all on piece.
3. it is according to claim 1 omit piece outer filter receiver, it is characterized in that, the matching network include series connection
Electric capacity one and inductance one；The first end of electric capacity one receives the radiofrequency signal from antenna as the input of matching network；Electricity
The second end for holding one is connected with the first end of inductance one, used as the output end of matching network；The second end ground connection of inductance one.
4. the receiver for omitting piece outer filter according to claim 3, it is characterized in that, passive filter and matching network
In inductance one it is in parallel, form a wave filter in the output end of matching network, for filter it is being come by emitter coupling or
The band external blocking signal received by antenna.
5. it is according to claim 1 omit piece outer filter receiver, it is characterized in that, the matching network include electric capacity
First, inductance two, inductance three, electric capacity two and electric capacity three；The first end of electric capacity one is received and comes from day as the input of matching network
The radiofrequency signal of line；Inductance two, inductance three, electric capacity two and electric capacity three are parallel between second end of electric capacity one and ground；Electric capacity one
The second end as matching network output end；Electric capacity two is tunable capacitor.Electric capacity three is that the switching tube in passive filter exists
At the node to ground parasitic capacitance.
6. it is according to claim 5 omit piece outer filter receiver, it is characterized in that, adjust electric capacity two size, make
Inductance three, electric capacity two, electric capacity three triple channel parallel network at signal frequency resonance；In passive filter and matching network
Inductance two, inductance three it is in parallel, a wave filter is formed in the output end of matching network, for filtering what is come by emitter coupling
Or the band external blocking signal received by antenna.
7. it is according to claim 1 omit piece outer filter receiver, it is characterized in that, the matching network include electric capacity
First, inductance one, electric capacity two and electric capacity three；The first end of electric capacity one receives penetrating from antenna as the input of matching network
Frequency signal；Inductance one, electric capacity two and electric capacity three are parallel between second end of electric capacity one and ground；Second end of electric capacity one as
The output end of distribution network；Electric capacity two is tunable capacitor；Electric capacity three be switching tube in passive filter at the node to ground
Parasitic capacitance.
8. it is according to claim 6 omit piece outer filter receiver, it is characterized in that, adjust electric capacity two size, make
Inductance one, electric capacity two, electric capacity three triple channel parallel network at signal frequency resonance；In passive filter and matching network
Inductance one it is in parallel, form a wave filter in the output end of matching network, for filter it is being come by emitter coupling or by
The band external blocking signal that antenna is received.
9. it is according to claim 1 omit piece outer filter receiver, it is characterized in that, the matching network include electric capacity
First, electric capacity four, inductance four, electric capacity two and electric capacity three；The first end of electric capacity one is received and comes from day as the input of matching network
The radiofrequency signal of line；Second end of electric capacity one is connected with the first end of electric capacity four, the second end ground connection of electric capacity four；Electric capacity one
Second end also connects the first end of electric capacity two and the first end of electric capacity three by inductance four, the first end of electric capacity two and electric capacity three
First end as matching network output end；The second end ground connection of electric capacity two；The second end ground connection of electric capacity three；Electric capacity two and electric capacity
Four is tunable capacitor；Electric capacity three be switching tube in passive filter at the node to ground parasitic capacitance.
10. the receiver for omitting piece outer filter according to claim 9, it is characterized in that, passive filter and pair net
Network collective effect, matching network output end formed a wave filter, for filter by emitter coupling come or by day
The band external blocking signal that line is received.
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| CN108259021A (en) * | 2018-01-10 | 2018-07-06 | 广西师范大学 | A kind of CMOS broadbands distribution variable band-pass filter |
| CN108667503A (en) * | 2018-04-19 | 2018-10-16 | 京信通信系统（中国）有限公司 | Improve the method, apparatus and equipment of equipment Clogging indicator |
| CN110995297A (en) * | 2019-10-29 | 2020-04-10 | 芯创智（北京）微电子有限公司 | Low-power consumption receiver of silent surface wave filter |
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