CN106888029B - A kind of receiver omitting piece outer filter - Google Patents
A kind of receiver omitting piece outer filter Download PDFInfo
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- CN106888029B CN106888029B CN201710034055.8A CN201710034055A CN106888029B CN 106888029 B CN106888029 B CN 106888029B CN 201710034055 A CN201710034055 A CN 201710034055A CN 106888029 B CN106888029 B CN 106888029B
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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
Abstract
This application discloses a kind of receivers for omitting piece outer filter, from antenna next coming in order matching connection network, passive filter, baseband amplifier and filter.The matching network is inductively or capacitively made of one or more.The passive filter has multiple channels in parallel, and each channel is connected in series by a switching tube and a sampling capacitance, and the switching tube in each channel controls its on or off by a carrier signal；The high level pulse of these carrier signals is without overlapping；During the high level pulse of some carrier signal, be connected by the switching tube that the carrier signal controls, rest switch pipe is turned off.The baseband amplifier and filter to after down coversion intermediate frequency or baseband signal be further amplified and filter.Piece outer surface acoustic wave filter is omitted in the application, realizes the lower noise coefficient of receiver, improves and filter out the ability with external blocking, the trade-off relation for improving the linearity, eliminating input matching and baseband amplifier.
Description
Technical field
This application involves a kind of radio-frequency transmitters, more particularly to radio-frequency front-end therein.
Background technique
Transceiver (transceiver) includes transmitter (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 transceiver of the mobile communication such as 4G, the high-power signal that transmitter generates can be coupled to reception in several ways
Machine, so that receiver be made to face the risk of saturation.Meanwhile the signal that antenna receives also is often associated with powerful obstruction letter
Number, it can equally make the saturation of receiver.In order to promote receiver to the inhibitory effect with external blocking, have some existing receivers
Radio-frequency front-end scheme is suggested.
" IEEE solid-state circuit magazine " (the IEEE Journal of Solid-State Circuits) in April, 2011
The phase of volume 46 the 4th has an article " the tetra- frequency saw-less receiver system on chip of 65nm CMOS for 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 system on chip (SoC)
With multiple surface acoustic waves (SAW) filter, it is respectively intended to be filtered different communication bands.The disadvantages of this solution is
The volume of piece outer filter is big and price.
" IEEE solid-state circuit magazine " the 12nd phase of volume 45 in December, 2010 has an article " to have digital control and wide
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,
The part III discloses a kind of receiver, as shown in Figure 2.The receiver is directly connected to antenna with passive frequency mixer, and radio frequency is omitted
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 inhibitory effect for the band external blocking signal of down coversion, therefore this using frequency mixer as the receiver of the first order
With the very high linearity.The disadvantages of this solution is there is two.First, since low-noise amplifier is omitted, so that with mixing
Device is that the noise coefficient of the receiver of the first order is poor, and system sensitivity is caused to be deteriorated.Second, base band low-noise amplifier
Current sample is used to the output signal of passive frequency mixer, the input impedance of baseband amplifier is upconverted to by passive frequency mixer
The input terminal of passive frequency mixer provides the input matching of radiofrequency signal, therefore together with the equivalent conducting resistance of passive frequency mixer
Input matching and the design of baseband amplifier need mutually compromise.Identical technical solution is also documented in application publication number
CN102845126A, the Chinese invention patent application " wireless telecom equipment and system " that data of publication of application is on December 26th, 2012
In.
The Chinese invention patent application that application publication number is CN103546176A, data of publication of application is on January 29th, 2014
In " wireless receiver and its signal processing method ", 0066 section of 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 realize impedance isolation, and frequency mixer realizes the down coversion of radiofrequency signal.The disadvantages of this solution is introducing
Buffer will increase additional power consumption, can also introduce noise and signal is decayed.Simultaneously because buffer itself is non-linear,
The signal-to-noise ratio of signal can also be reduced.
Summary of the invention
The technical problem to be solved by the application is to provide it is a kind of omit piece outer filter receiver, using piece (i.e.
On piece) filter structure come the band external blocking letter that filters out from the transmitter transmitting signal that comes of coupling or received from antenna
Number, to promote the linearity of receiver and reduce noise.
In order to solve the above technical problems, the receiver provided by the present application for omitting piece outer filter connects from antenna next coming in order
Connect matching network, passive filter, baseband amplifier and filter.The matching network is by one or more inductively or capacitively groups
At the radiofrequency signal received to antenna realizes input resistant matching while carrying out pre-amplification.The passive filter has simultaneously
Multiple channels of connection, each channel is connected in series by a switching tube and a sampling capacitance, and opening in each channel
It closes pipe and its on or off is all controlled by a carrier signal；The high level pulse of these carrier signals is without overlapping；At certain
During the high level pulse of a carrier signal, be connected by the switching tube that the carrier signal controls, rest switch pipe is turned off；It is in office
It anticipates the moment, the input signal of passive filter passes through from the only channel in multiple channels in parallel, by the sampling in the channel
Output end after capacitor sampling in passive filter obtains the intermediate frequency after down coversion or baseband signal.The baseband amplifier and filter
Wave device to after down coversion intermediate frequency or baseband signal be further amplified and filter.Preferably, the matching network, passive filtering
Device, baseband amplifier and filter are all realized on piece.
In example 1, the matching network includes concatenated capacitor one and inductance one；The first end conduct of capacitor one
The input terminal of matching network receives the radiofrequency signal from antenna；The second end of capacitor one is connected with the first end of inductance one,
Output end as matching network；The second end of inductance one is grounded.
In example 2, the matching network includes capacitor one, inductance two, inductance three, capacitor two and capacitor three；Capacitor
Input terminal of one first end as matching network receives the radiofrequency signal from antenna；Between the second end and ground of capacitor one
It is parallel with inductance two, inductance three, capacitor two and capacitor three；Output end of the second end of capacitor one as matching network；Capacitor two
It is tunable capacitor.Capacitor is third is that the switching tube in passive filter arrives ground parasitic capacitance at the node.
In the third embodiment, the matching network includes capacitor one, inductance one, capacitor two and capacitor three；The of capacitor one
Input terminal of the one end as matching network receives the radiofrequency signal from antenna；It is parallel between the second end and ground of capacitor one
Inductance one, capacitor two and capacitor three；Output end of the second end of capacitor one as matching network；Capacitor is second is that tunable capacitor；Electricity
Hold third is that the switching tube in passive filter arrives ground parasitic capacitance at the node.
In example IV, the matching network includes capacitor one, capacitor four, inductance four, capacitor two and capacitor three；Capacitor
Input terminal of one first end as matching network receives the radiofrequency signal from antenna；The second end and capacitor four of capacitor one
First end be connected, the second end of capacitor four ground connection；The second end of capacitor one also passes through first that inductance four connects capacitor two
The first end at end and capacitor three, the output end of the first end of capacitor two and the first end of capacitor three as matching network；Capacitor two
Second end ground connection；The second end of capacitor three is grounded；Capacitor two and capacitor are fourth is that tunable capacitor；Capacitor is third is that in passive filter
Switching tube at the node to ground parasitic capacitance.
In above each embodiment, passive filter and matching network collective effect, in the output end shape of matching network
At a filter, for filter by transmitter coupling Lai or the band external blocking signal that is received by antenna.
What the application obtained, which has the technical effect that, realizes the receiver for omitting piece outer surface acoustic wave filter, realizes lower
Noise coefficient, improve and filter out the ability with external blocking signal, to improve the linearity, eliminate input matching and base band
The trade-off relation of amplifier.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of traditional receiver radio frequency front end.
Fig. 2 is a kind of structural schematic diagram of existing receiver using passive frequency mixer.
Fig. 3 is a kind of structural schematic diagram of existing receiver with match circuit and buffer.
Fig. 4 is the structural schematic diagram of the embodiment one of the receiver provided by the present application for omitting piece outer filter.
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 schematic diagram of the embodiment two of the receiver provided by the present application for omitting piece outer filter.
Fig. 7 is the structural schematic diagram of the embodiment three of the receiver provided by the present application for omitting piece outer filter.
Fig. 8 is the structural schematic diagram of the example IV of the receiver provided by the present application for omitting piece outer filter.
Fig. 9 is the schematic equivalent circuit one of the receiver provided by the present application for omitting piece outer filter.
Figure 10 is the schematic equivalent circuit two of the receiver provided by the present application for omitting piece outer filter.
Figure 11 is the gain of receiver provided by the present application and the simulation result diagram of frequency relation.
Figure 12 is the rf gain of the embodiment two of receiver provided by the present application and the simulation result of S11 and frequency relation
Figure.
Figure 13 is the conversion gain of receiver provided by the present application and the emulation knot of two-sided cells and frequency relation
Fruit figure.
Description of symbols in figure: T is switching tube；C is capacitor；L is inductance；R is resistance.
Specific embodiment
Referring to Fig. 4, this is the embodiment one of the receiver provided by the present application for omitting piece outer filter.The embodiment one
Shown in receiver from antenna next coming in order include matching network, passive filter, baseband amplifier and filter.The matching
Network includes concatenated one C1 of capacitor and one L1 of inductance.Input terminal of the first end of one C1 of capacitor as matching network receives and
From the radiofrequency signal of antenna.The second end of one C1 of capacitor is connected with the first end of one L1 of inductance, the output as matching network
End.The second end of one L1 of inductance is grounded.The passive filter has N number of channel in parallel, and each channel is switched by one
Pipe TNWith a sampling capacitance CLNIt is connected in series, and the switch transistor T in each channelNAll by a carrier signal LONControl it
On or off.Referring to Fig. 5, N number of switch transistor T in N number of channel of passive filterNBy N number of different carrier signal LO1
To LONIt controls respectively, this N number of carrier signal LO1To LONSuch as it is generated by N number of local oscillator.Preferably, this N number of carrier wave letter
Number LO1To LONPeriod it is identical, duty ratio is also identical, and the high level pulse of any two carrier signal is without overlapping.
During the high level pulse of some carrier signal, be connected by the switching tube that the carrier signal controls, rest switch pipe is turned off.
Therefore at any time, the input signal of passive filter passes through from the only channel in N number of channel in parallel, by the channel
Sampling capacitance sampling after in the output end of passive filter obtain the intermediate frequency after down coversion or baseband signal.
In above-described embodiment one, the radiofrequency signal that antenna receives is sent to matching network first.Matching network realizes input
The matching of impedance, while also radiofrequency signal is prevented greatly to have certain inhibition to the noise of late-class circuit.Matching network
The radiofrequency signal of output is sent to passive filter, and passive filter is in parallel with one L1 of inductance in matching network, in pair net
The output end of network forms the filter of a high quality factor, for filter by transmitter coupling Lai or received by antenna
Band external blocking signal.Passive filter also passes through N number of channel and carries out time sharing sampling, and radiofrequency signal is down-converted to intermediate frequency or base
Band signal is sent to baseband amplifier and 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 filter are to the intermediate frequency or base band after down coversion
Signal is further amplified and filters.
In above-described embodiment one, matching network, passive filter, baseband amplifier and filter are preferably all on piece reality
It is existing.Matching network therein realizes impedance matching at certain working frequencies, and one L1 of inductance is needed using biggish inductance value,
It is unfavorable on piece realization.
Referring to Fig. 6, this is the embodiment two of the receiver provided by the present application for omitting piece outer filter.The embodiment two
Difference with embodiment one is only that matching network.Matching network in the embodiment two includes that first end is connected with antenna
One C1 of capacitor is parallel with two L2 of inductance, three C3 of three L3 of inductance, two C2 of capacitor and capacitor between the second end and ground of one C1 of capacitor.
Two C2 of capacitor is tunable capacitor.Three C3 of capacitor is that the switching tube in passive filter arrives ground parasitic capacitance at the node.Electricity
Hold input terminal of the first end as matching network of a C1, receives the radiofrequency signal from antenna.The second end of one C1 of capacitor is made
For the output end of matching network.
In above-described embodiment two, matching network, passive filter, baseband amplifier and filter are preferably all on piece reality
It is existing.One L1 of inductance in embodiment one is equivalent to two L2 of inductance in parallel, three L3 of inductance, two C2 of tunable capacitor in example 2
With three C3 of parasitic capacitance.By adjusting the size of two C2 of capacitor, two C2 of three L3 of inductance and capacitor, the triple channel of three C3 of capacitor are in parallel
The resonance at signal frequency may be implemented in network.If suitably increasing the capacitance of two C2 of capacitor, the inductance value of three L3 of inductance will become
It is small to be suitble to piece realize.Because the resistance value of the equivalent parallel resistance at resonance frequency is larger, this parallel network is almost
The function of matching network is not influenced, and the original function of the matching network in embodiment one can be retained in example 2.
Passive filter in embodiment two is in parallel with two L2 of inductance, three L3 of inductance in matching network, in the output end of matching network
Form the filter of a high quality factor, for filter by transmitter coupling Lai or by antenna receive band external blocking
Signal.
Referring to Fig. 7, this is the embodiment three of the receiver provided by the present application for omitting piece outer filter.The embodiment three
Difference with embodiment one is only that matching network.Matching network in the embodiment three includes that first end is connected with antenna
One C1 of capacitor is parallel with three C3 of one L1 of inductance, two C2 of capacitor and capacitor between the second end and ground of one C1 of capacitor.Two C2 of capacitor is
Tunable capacitor.Three C3 of capacitor is that the switching tube in passive filter arrives ground parasitic capacitance at the node.The of one C1 of capacitor
Input terminal of the one end as matching network receives the radiofrequency signal from antenna.The second end of one C1 of capacitor is as matching network
Output end.
In above-described embodiment three, matching network, passive filter, baseband amplifier and filter are preferably all on piece reality
It is existing.Matching network in embodiment three be equivalent on the basis of one L1 of inductance of embodiment one increased newly it is in parallel with one L1 of inductance
Three C3 of two C2 of tunable capacitor and parasitic capacitance.By adjusting the size of two C2 of capacitor, two C2 of one L1 of inductance and capacitor, capacitor three
The resonance at signal frequency may be implemented in the parallel network of C3.If suitably increasing the capacitance of two C2 of capacitor, the sense of one L1 of inductance
Value, which will be varied down to, to be suitble to realize in piece.Because the resistance value of the equivalent parallel resistance at resonance 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 obtain in the third embodiment
To reservation.Passive filter in embodiment three is in parallel with one L1 of inductance in matching network, in the output end shape of matching network
At the filter of a high quality factor, for filter by transmitter coupling Lai or the band external blocking that is received by antenna believe
Number.
Referring to Fig. 8, this is the example IV of the receiver provided by the present application for omitting piece outer filter.The example IV
Difference with embodiment one is only that matching network.Matching network in the example IV includes concatenated one C1 of capacitor and capacitor
Four C4 further include three C3 of four L4 of inductance, two C2 of capacitor and capacitor.Two C2 of capacitor and four C4 of capacitor is tunable capacitor.Three C3 of capacitor
It is that the switching tube in passive filter arrives ground parasitic capacitance at the node.The first end of one C1 of capacitor is as matching network
Input terminal receives the radiofrequency signal from antenna.The second end of one C1 of capacitor is connected with the first end of four C4 of capacitor, capacitor four
The second end of C4 is grounded.The second end of one C1 of capacitor also passes through three C3's of first end and capacitor of four L4 connection capacitor of inductance, two C2
First end, output end of the first end of three C3 of first end and capacitor of two C2 of capacitor as matching network.The second of two C2 of capacitor
End ground connection.The second end of three C3 of capacitor is grounded.
In above-described embodiment four, matching network, passive filter, baseband amplifier and filter are preferably all on piece reality
It is existing.Matching network in embodiment one is L-type, and the matching network in example IV has been changed to Π type.This Π type matching network
It is integrated to be not only suitable on piece, and facilitates and is realized outside piece.The integrated integrated level that system can be improved of on piece, piece is realized outside can be using more
The inductance capacitor element of high quality factor improves the noiseproof feature of system.Meanwhile by rationally adjusting electricity if piece is realized
Hold the capacitance of two C2 of four C4 and capacitor, it can be achieved that multiple frequency ranges input resistant matching.Passive filter in example IV with
Matching network cooperatively acts on, matching network output end formed a high quality factor filter, for filter by
Band external blocking signal that is that transmitter coupling comes or being received by antenna.Two C2 of capacitor and three C3 of capacitor are in parallel, or simultaneously
In parallel with liner parasitic capacitance (not shown) at the node, the liner parasitic capacitance at four C4 of capacitor and its corresponding node is (not
Diagram) it is in parallel, so that the robustness of Π type matching network is improved, perfect match may be implemented.
It is all to cascade matching network and passive frequency mixer, this not only can be pre- to signal in above each embodiment
Amplification can also enhance the inhibition to out-of-band interference signal to improve the noiseproof feature of receiver.Referring to Fig. 9, this is this
The schematic equivalent circuit one of the receiver for the omission piece outer filter that application provides.Antenna can be equivalent to ideal voltage source Vs
With the series connection of resistance Rs.Matching network is made 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 network of Cp and resistive element Rp composition, while the series resistance Rsw from switching tube idealization that connects, simultaneously
Paralleling switch pipe is in the node to the parasitic capacitance C3 on ground.
If equivalent circuit one shown in Fig. 9 can be further simplified as shown in Fig. 10 etc. in carrier frequency resonance
Imitate circuit two.Because LCR resonant network is reduced to resistance Rp in carrier frequency resonance.Passive frequency mixer is just reduced to
Resistance Rsw connects with resistance Rp's, it is also possible to which resistance Rsw+Rp is indicated.Switching tube is in the node to the parasitic capacitance on ground
C3 can be absorbed into matching network.The input equivalent resistance of matching network in Figure 10 is equal to resistance at resonance frequency
RS, simultaneously as Rp is much larger than Rs, so Vout/Vin is greater than 1, i.e., the matching network has amplification to signal, so rear class
The available inhibition of the noise of passive frequency mixer.Meanwhile other than resonance frequency, resistance Rs is converted by the impedance of matching network
After, equivalent impedance equally becomes larger, so that the gain at out-of-band frequency becomes smaller, that is, improves the inhibition to out-of-band interference signal.
Figure 11 is please referred to, this is the gain of receiver and the simulation result schematic diagram of frequency relation, it is assumed that the center of carrier wave
Frequency is 1GHz.Curve one is demonstrated by the receiver provided by the present application for omitting piece outer filter, but omits matching network
Situation.The case where second curve is demonstrated by the receiver provided by the present application for omitting piece outer filter, include matching network.Than
Compared with this two curves it can be found that when there is no matching network, due to the influence of switching tube parasitic capacitance in passive frequency mixer, cause
Centre frequency has offset.And after increasing matching network, the influence of switching tube parasitic capacitance in passive frequency mixer can be incorporated to
In matching network, to realize that the gain of no offset makes centre frequency remain 1GHz.At centre frequency, increase matching network
The gain of 5dB can be improved afterwards.At out-of-band frequency, 6dB can be improved to the inhibition of out of band signal after increasing matching network.
Figure 12 is please referred to, this is the rf gain of matching network output end in embodiment three, (input port voltage is anti-by 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.By curve three it is found that the gain at 1GHz frequency is since matching network is to the pre-amplification of useful signal
9.1dB, while the filter of a high quality factor (equivalent Q-value here is 50) is formed in the output end of matching network, from
And filter bag external blocking signal.The both ends gain of curve three is all in -5dB hereinafter, therefore to the inhibition of out of band signal up to 15dB
Left and right, so that receiver be avoided to be caused to be saturated by band external blocking signal.Curve four is demonstrated by S11 and frequency relation.By curve four
It is found that by the size that one L1 of inductance and two C2 of tunable capacitor is rationally arranged, it can be at center under the driving of 1GHz carrier signal
Impedance matching is realized at frequency, the S11 at 1GHz frequency is -16dB.
Figure 13 is please referred to, this is the simulation result of conversion gain in embodiment three, two-sided cells and frequency relation
Schematic diagram.Curve five is demonstrated by conversion gain and frequency relation.By curve five it is found that conversion gain is about 15dB, increase than radio frequency
Beneficial high 6dB, this is because intermediate frequency or base band are differential signal, and radiofrequency signal is the reason of single-ended signal.Curve six shows
Two-sided cells and frequency relation.By curve six it is found that because having matching network to the pre-amplification of signal, receiver system
The noise coefficient of very little may be implemented in system.Curve six is shown within the scope of the signal bandwidth within 10MHz, and entire noise coefficient is small
In 3dB.
The receiver of omission piece outer filter provided herein has the advantages that.
First, worked by passive frequency mixer and matching network one without piece outer filter and constitute a filter,
For filtering out band external blocking signal.
Second, increasing matching network before passive frequency mixer, which not only realizes input resistant matching, also
Pre-amplification is carried out to signal, to have a certain effect to the linearity for inhibiting noise, promotion receiver.The matching network also makes
High impedance is presented in the input terminal (i.e. the output end of matching network) for obtaining passive frequency mixer, this equivalent high impedance connected with passive is mixed
Frequency device makes the decaying of out of band signal become larger, that is, improves to the inhibition with external blocking signal, as shown in figure 11.
Third, the output end of matching network is directly connected to the input terminal of passive frequency mixer, without using therebetween
Buffer, thus so that entire receiver is reduced power consumption and improve noiseproof feature.
Fourth, baseband amplifier and 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 do not change because baseband processor changes, while also unrelated with input signal size,
Keep the realization of baseband amplifier and filter more flexible.For the baseband amplifier of current sample, equivalent input impedance compared with
Small, the conducting resistance that rf inputs and switching tube can be upconverted to by passive frequency mixer provides input matching, Gu Huixiang together
Mutually compromise.For the baseband amplifier of voltage sample, 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 above is only preferred embodiment of the present application, it is not used to limit the application.Come for those skilled in the art
It says, various changes and changes are possible in this application.Within the spirit and principles of this application, made any modification, equivalent
Replacement, improvement etc., should be included within the scope of protection of this application.
Claims (8)
1. a kind of receiver for omitting piece outer filter, characterized in that from antenna next coming in order matching connection network, passive filtering
Device, baseband amplifier and filter；
The matching network is inductively or capacitively made of one or more, including at least the electricity being sequentially connected in series between antenna and ground
Appearance and inductance realize input resistant matching to the radiofrequency signal that antenna receives while carrying out pre-amplification；
The passive filter has multiple channels in parallel, and each channel is connected by a switching tube and a sampling capacitance
It forms, and the switching tube in each channel controls its on or off by a carrier signal；The height of these carrier signals
Level pulse is without overlapping；During the high level pulse of some carrier signal, led by the switching tube that the carrier signal controls
Logical, rest switch pipe is turned off；At any time, the input signal of passive filter is from only one in multiple channels in parallel
Channel passes through, intermediate frequency or base band after down coversion is obtained by the output end after the sampling capacitance sampling in the channel in passive filter
Signal；Inductance in parallel in passive filter and matching network forms a filter in the output end of matching network, was used to
It is that filter is come by transmitter coupling or by antenna receive with external blocking signal；
The baseband amplifier and filter to after down coversion intermediate frequency or baseband signal be further amplified and filter.
2. the receiver according to claim 1 for omitting piece outer filter, characterized in that the matching network, passive filter
Wave device, baseband amplifier and filter are all realized on piece.
3. the receiver according to claim 1 for omitting piece outer filter, characterized in that the matching network includes series connection
Capacitor one and inductance one；Input terminal of the first end of capacitor one as matching network receives the radiofrequency signal from antenna；Electricity
The second end of appearance one is connected with the first end of inductance one, the output end as matching network；The second end of inductance one is grounded.
4. the receiver according to claim 3 for omitting piece outer filter, characterized in that passive filter and matching network
In inductance one it is in parallel, form a filter in the output end of matching network, for filter by transmitter coupling Lai or
The band external blocking signal received by antenna.
5. the receiver according to claim 1 for omitting piece outer filter, characterized in that the matching network includes capacitor
One, inductance two, inductance three, capacitor two and capacitor three；Input terminal of the first end of capacitor one as matching network receives and comes from day
The radiofrequency signal of line；Inductance two, inductance three, capacitor two and capacitor three are parallel between the second end and ground of capacitor one；Capacitor one
Output end of the second end as matching network；Capacitor is second is that tunable capacitor；Capacitor is third is that the switching tube in passive filter exists
The output end of matching network arrives ground parasitic capacitance.
6. the receiver according to claim 5 for omitting piece outer filter, characterized in that the size for adjusting capacitor two makes
Inductance three, capacitor two, capacitor three triple channel parallel network at signal frequency resonance；In passive filter and matching network
Inductance two, inductance three it is in parallel, form a filter in the output end of matching network, for filter by transmitter coupling Lai
Or the band external blocking signal received by antenna.
7. the receiver according to claim 1 for omitting piece outer filter, characterized in that the matching network includes capacitor
One, inductance one, capacitor two and capacitor three；Input terminal of the first end of capacitor one as matching network receives penetrating from antenna
Frequency signal；Inductance one, capacitor two and capacitor three are parallel between the second end and ground of capacitor one；The second end conduct of capacitor one
The output end of distribution network；Capacitor is second is that tunable capacitor；Capacitor third is that switching tube in passive filter matching network output
Ground parasitic capacitance is arrived at end.
8. the receiver according to claim 6 for omitting piece outer filter, characterized in that the size for adjusting capacitor two makes
Inductance one, capacitor two, capacitor three triple channel parallel network at signal frequency resonance；In passive filter and matching network
Inductance one it is in parallel, form a filter in the output end of matching network, for filter by transmitter coupling Lai or by
The band external blocking signal that antenna receives.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710034055.8A CN106888029B (en) | 2017-01-18 | 2017-01-18 | A kind of receiver omitting piece outer filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710034055.8A CN106888029B (en) | 2017-01-18 | 2017-01-18 | A kind of receiver omitting piece outer filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106888029A CN106888029A (en) | 2017-06-23 |
| CN106888029B true CN106888029B (en) | 2019-05-24 |
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| CN201710034055.8A Active CN106888029B (en) | 2017-01-18 | 2017-01-18 | A kind of receiver omitting piece outer filter |
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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 |
| CN108667503B (en) * | 2018-04-19 | 2021-06-22 | 京信通信系统（中国）有限公司 | Method, device and equipment for improving equipment blocking index |
| 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 |
| CN111030726B (en) * | 2019-12-13 | 2022-02-25 | 展讯通信（上海）有限公司 | Radio frequency front end control circuit and control method thereof, radio frequency front end control chip, system, storage medium and terminal |
| CN111277223B (en) * | 2020-03-09 | 2021-06-29 | 东南大学 | High-order coupling network with interference suppression and application thereof |
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| KR20100053184A (en) * | 2008-11-12 | 2010-05-20 | 삼성전기주식회사 | Integrated tracking filter, and rf receiver |
| CN101926091A (en) * | 2008-01-28 | 2010-12-22 | 日本电气株式会社 | Voltage current converter, differentiation circuit, integration circuit, and filter circuit using converter, and voltage current conversion method |
| CN104485917A (en) * | 2015-01-04 | 2015-04-01 | 上海交通大学 | Impedance bootstrapping frequency conversion band-pass filter |
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| CN101926091A (en) * | 2008-01-28 | 2010-12-22 | 日本电气株式会社 | Voltage current converter, differentiation circuit, integration circuit, and filter circuit using converter, and voltage current conversion method |
| KR20100053184A (en) * | 2008-11-12 | 2010-05-20 | 삼성전기주식회사 | Integrated tracking filter, and rf receiver |
| CN104485917A (en) * | 2015-01-04 | 2015-04-01 | 上海交通大学 | Impedance bootstrapping frequency conversion band-pass filter |
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