CN106888028A - A kind of high sensitivity receiver front-ends circuit with impedance mapping function - Google Patents
A kind of high sensitivity receiver front-ends circuit with impedance mapping function Download PDFInfo
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- CN106888028A CN106888028A CN201710235204.7A CN201710235204A CN106888028A CN 106888028 A CN106888028 A CN 106888028A CN 201710235204 A CN201710235204 A CN 201710235204A CN 106888028 A CN106888028 A CN 106888028A
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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
-
- 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
-
- 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
- H04B1/1018—Means associated with receiver for limiting or suppressing noise or interference noise filters connected between the power supply and the receiver
-
- 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
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Amplifiers (AREA)
- Superheterodyne Receivers (AREA)
Abstract
The invention belongs to wireless communication technology field, specially a kind of high sensitive receiver RF front-end circuit with impedance mapping function includes：Linear compensating circuit, low-noise trans-conductance amplifier circuit, active negative-feedback circuit, divider circuit, passive mixer circuit, with phase trans-impedance amplifier and orthogonal trans-impedance amplifier；Using the impedance mapping function of passive frequency mixer, by the impedance with low-pass characteristic at low frequency, the radio-frequency head centered on local frequency is mapped to, in the output end of low-noise trans-conductance amplifier one bandpass filter of the high frequency and high quality factor of equivalent formation.Low-noise trans-conductance amplifier provides gain in the receiver first order, the noise contribution for effectively suppressing late-class circuit improves the sensitivity of whole link, and using the active negative-feedback of low-noise trans-conductance amplifier, impedance is mapped to input, suppress band external blocking signal using the impedance matching of input, making the antijamming capability of receiver strengthens, and improves the dynamic range of front end.
Description
Technical field
The invention belongs to wireless communication technology field, and in particular to a kind of high sensitivity with impedance mapping function is received
Machine RF front-end circuit.
Background technology
With smart city, big data, the arriving in artificial intelligence epoch, wireless communication technology will wherein play the part of more next
More key player and as bridge realize all things on earth interconnect.Mobile communication from the connection of people and people, to people and thing and thing with
The connection of thing is strided forward, and all things on earth interconnection is inexorable trend.There is the link demand of substantial amounts of sensing class and control class in the Internet of Things world,
The requirement of these connection speeds is very low, but very sensitive to power consumption and cost, and widely dispersed, connects huge, existing
Some 3G/4G technologies cannot meet requirement from cost and power consumption.For example：Arrowband Internet of Things is used as a kind of honeycomb technology of Internet of things
Transmitted using ultra-narrow band, repetition, simplify the design such as procotol, to sacrifice given pace, time delay, mobility performance, obtain face
To the bearing capacity of low-power consumption wide area network.Therefore, flexibly configurable low cost and low-power consumption receiver front end design, just into
It is the important trends of receiver front end development.
Anti-Jamming Technique is the main target and difficult point of current design in receiver low cost sheet.Because with radio communication
Technology is continued to develop, and frequency spectrum resource is also more and more nervous, and various wireless communication signal is there may be in same region.Difference association
Interval between the frequency spectrum that view is occupied is very narrow.The 900MHz that Sub-GHz frequency ranges and the U.S. for example residing for arrowband Internet of Things specify
Just there was only 8MHz in the minimum interval of GSM downlink frequency bands.Crowded spectrum application can cause receiver to be done with outer high intensity
Disturb the interference of signal.Interfering between signal has become an important bottleneck of Development of Wireless Communications on different spectral.
Interference signal would generally be suppressed using piece outer filter, but its is relatively costly, the wave filter of high frequency treatment high-quality-factor
It is difficult on piece.
It is to realize a jamproof solution on piece using the impedance mapping principle of passive frequency mixer.Traditional reception
Impedance between the modules of machine front end cannot be mapped, because being isolated with buffer stage between modules.It is domestic
There are numerous studies directly to use frequency mixer as the receiver first order outward, only carry out impedance mapping, but there is prime and do not have
Gain is inadequate to late-class circuit noise suppressed and local oscillation signal is directly by the leakage problem of frequency mixer, side proposed by the present invention
Case by active negative-feedback increase an impedance map, and increase low-noise trans-conductance amplifier can suppress rear class noise and this
The leakage shaken, the radio-frequency head filtering formed after low noise trans-impedance amplifier can also effectively improve Out-of-band rejection ability.
The content of the invention
It is an object of the invention to propose a kind of high sensitive receiver RF front-end circuit with impedance mapping function.
It forms a wave filter for high-quality-factor in the case where extra cost and power consumption is not increased at radio frequency.Can be normal
Amplify the useful signal in band, suppress the noise of late-class circuit, out of band signal can also be decayed, improve the anti-of receiver
Interference performance, is improved the dynamic range of whole receiver.
Receiver radio frequency front-end circuit with impedance mapping function proposed by the present invention, its structure are as shown in figure 1, bag
Include：Linear compensating circuit 1, low-noise trans-conductance amplifier circuit 2, active negative-feedback circuit 3, divider circuit 4, passive mixing
Device circuit 5, with phase trans-impedance amplifier 6 and orthogonal trans-impedance amplifier 7；Wherein, the low-noise trans-conductance amplifier of linear compensating circuit 1
The first order is realized in circuit 2 and the parallel connection of active negative-feedback circuit 3, and rear class is directly connected to passive mixer circuit 5, and local oscillation signal passes through
Divider circuit 4 is connected with passive mixer circuit 5；The output of passive mixer circuit 5 is respectively connected to same phase trans-impedance amplifier 6
With orthogonal trans-impedance amplifier 7.
Described linear compensating circuit 1, for compensating the non-linear of the introducing of low-noise trans-conductance amplifier circuit 2.
Described low-noise trans-conductance amplifier 2, for being electric current by the photovoltaic conversion of input signal, to reduce the first order
Voltage swing, improves antijamming capability；And the performance with low noise, reduces the noise of whole receiver.
Described active negative-feedback circuit 3, for by the impedance transfer of rear stage to input, by passive mixer circuit
The band pass impedance of 5 mappings is further transferred to input so that useful signal is matched in input, and band external blocking signal is mismatched.
Described divider circuit 4, for producing multiphase clock to coordinate the passive frequency mixer to carry out lower mixing and reality
The mapping function of existing base band impedance.
Described passive mixer circuit 5, for will be mixed down low frequency signal under radiofrequency signal, and has what impedance mapped
Function, the impedance at low frequency is mapped to the radio-frequency head of the frequency centered on local frequency.
Described same phase trans-impedance amplifier 5 and orthogonal trans-impedance amplifier 7, for current signal to be converted into voltage signal,
And sending-end impedance has low-pass characteristic.Wherein, it is used to process in-phase signal with phase trans-impedance amplifier 6, it is orthogonal to amplify across resistance
Device 7 is used to process orthogonal signalling.
Core of the invention is that the combination of active negative-feedback circuit and passive mixer circuit and trans-impedance amplifier makes
With, the noise that gain suppresses rear class can be not only provided, improve sensitivity.And formed in low-noise trans-conductance amplifier output end
The filtering of high-quality-factor, and by the impedance transfer to input stage, the energy of out-of-band interference signal is reflected.
Receiver radio frequency front-end circuit with impedance mapping function proposed by the present invention, mainly by passive frequency mixer
Impedance mapping function, by the low pass impedance characteristic of trans-impedance amplifier input, be mapped to the frequency centered on local frequency
Radio-frequency head, forms the impedance of bandpass characteristics.Therefore can realize with interior useful current signal by high resistant, signal is exaggerated；Band
External blocking current signal is attenuated by low-resistance, signal.One radio-frequency filter of high-quality-factor of equivalent formation on piece, improves
The dynamic range of receiver.
Receiver radio frequency front-end circuit with impedance mapping function of the present invention, the active negative-feedback of its first order
Circuit, the band pass impedance that passive mixer circuit maps further can be transmitted the impedance transfer of rear stage to input
To input so that useful signal is matched in input, band external blocking signal is mismatched.
When operation of receiver, the impedance mapping of whole receiver is that the impedance operator at low frequency is mapped into radio frequency
Place.By the impedance mapping function of passive frequency mixer 5, by the low of same phase trans-impedance amplifier 6 and the input of orthogonal trans-impedance amplifier 7
Logical impedance operator, is mapped to the radio-frequency head of the frequency centered on local frequency, forms the impedance of bandpass characteristics.Then, this band
Logical impedance operator further passes through active negative-feedback circuit 3 by impedance transfer to input so that impedance is before whole receiver
End forms path, completes the complete impedance mapping from base band to radio-frequency head, and this has very big with traditional receiver front end
It is different.Further, since the impedance mapping in the present invention is related to local frequency, change local frequency, the center of its mapping
Frequency also changes therewith, therefore the equivalent configurable band of a wide frequency ranges and centre frequency that forms selectively is filtered
Ripple device.When useful signal and band external blocking signal enter and are input into by antenna simultaneously, low-noise trans-conductance amplifier circuit 2 and active
The input impedance of the first order circuit of the composition of negative-feedback circuit 3 is different with band external blocking signal at the useful signal so that have
Matched and the reflection of block signal energy with signal power.By after low-noise trans-conductance amplifier circuit 2, useful signal and obstruction are believed
Number electric current is converted into, by the band pass impedance characteristic that passive frequency mixer is formed.It is high resistant at useful signal, is exaggerated.Obstruction letter
It is low-resistance at number, block signal is suppressed more so that the antijamming capability enhancing of receiver.In order to further increase reception
The anti-out-of-band interference ability of machine, adds linear compensating circuit 1, and it is non-linear that compensation low-noise trans-conductance amplifier circuit 2 is introduced.
Brief description of the drawings
Fig. 1 is the schematic diagram of the receiver radio frequency front-end circuit with impedance mapping function.
Fig. 2 is the impedance map feature schematic diagram of receiver radio frequency front-end circuit of the invention.
Fig. 3 be receiver radio frequency front-end circuit of the invention in the case of having high reject signal, the impedance of full link mapping
To the schematic diagram of the inhibitory action of out-of-band interference signal.
Specific embodiment
With reference to Fig. 1, the specific reality for implementing the receiver radio frequency front-end circuit with impedance mapping function is described in detail
Example.
After electricity in original state, receiver, with phase trans-impedance amplifier 6 and the normal work of orthogonal trans-impedance amplifier 7, its is defeated
Enter impedance and low-pass characteristic is presented respectively.Then by divider circuit 4, the non-friendship of four phases is input into passive mixer circuit 5
Folded clock, input signal distinguishes charge and discharge for 5 pairs by passive mixer circuit with phase trans-impedance amplifier 6 and orthogonal trans-impedance amplifier 7
Electricity so that the impedance operator of the low pass at low frequency is mapped to the radio-frequency head of the frequency centered on local frequency, forms at radio frequency
High-quality-factor bandpass characteristics.Then, the impedance operator of the high pass is further passed impedance by active negative-feedback circuit 3
It is defeated to input so that impedance whole receiver front end formed path, in front of the receiver end form complete mapping link.
When the signal band that receiver is received changes, local frequency change, the centre frequency of impedance mapping also changes therewith, connects
Receipts machine front end is equivalent to form a variable high-quality-factor wave filter of wide frequency ranges centre frequency.Its impedance mapping is with this
Vibration frequency variation effect can be shown in Fig. 2.
When useful signal and band external blocking signal enter to be input into by antenna simultaneously, as shown in Figure 3.Low noise mutual conductance is amplified
The input impedance of the first order circuit of device circuit 2 and the composition of active negative-feedback circuit 3 is at useful signal and with external blocking signal
Place is different so that available signal power is matched and block signal energy reflects.By after low-noise trans-conductance amplifier circuit 2, having
Electric current is converted into signal and block signal, by the band pass impedance characteristic that passive frequency mixer is formed.It is high resistant at useful signal,
It is exaggerated.It is low-resistance at block signal, block signal is suppressed more so that the antijamming capability enhancing of receiver.It is useful
Signal and block signal by passive frequency mixer 5, under be mixed to intermediate frequency.Finally by trans-impedance amplifier（Put across resistance including same
Big device 6 and orthogonal trans-impedance amplifier 7）, signal is converted into voltage, simultaneously because the low-frequency filter characteristicses of trans-impedance amplifier, obstruction
Signal is further attenuated.
Finally it should be strongly noted that above-mentioned example is only used to illustrate technical implementation way of the invention, and it is not
Unique scheme.It will be understood by those within the art that, technical scheme can be modified or equivalent
Replace, without deviating from the spirit and scope of technical solution of the present invention, it all should cover in the middle of scope of the presently claimed invention.
Claims (7)
1. a kind of high sensitive receiver RF front-end circuit with impedance mapping function, it is characterised in that including：The linearity
Compensation circuit（1）, low-noise trans-conductance amplifier circuit（2）, active negative-feedback circuit（3）, divider circuit（4）, passive mixing
Device circuit（5）, with phase trans-impedance amplifier（6）With orthogonal trans-impedance amplifier（7）；Wherein, linear compensating circuit（1）Low noise across
Lead amplifier circuit（2）With active negative-feedback circuit（3）The first order is realized in parallel connection, and rear class is directly connected to passive mixer circuit
（5）, local oscillation signal is by divider circuit（4）With passive mixer circuit（5）Connection；Passive mixer circuit（5）Output
It is respectively connected to same phase trans-impedance amplifier（6）With orthogonal trans-impedance amplifier（7）.
2. the high sensitive receiver RF front-end circuit with impedance mapping function according to claim 1, its feature
It is, described linear compensating circuit（1）, for compensating low-noise trans-conductance amplifier circuit（2）What is introduced is non-linear.
3. the high sensitive receiver RF front-end circuit with impedance mapping function according to claim 1, its feature
It is, described low-noise trans-conductance amplifier（2）, for the voltage signal of input to be converted into electric current, to reduce the first order
Voltage swing, improve antijamming capability；And the performance with low noise, reduces the noise of whole receiver.
4. the high sensitive receiver RF front-end circuit with impedance mapping function according to claim 1, its feature
It is, described active negative-feedback circuit（3）, for by the impedance transfer of rear stage to input, by passive mixer circuit
（5）The band pass impedance of mapping is further transferred to input so that useful signal is matched in input, and band external blocking signal is not
Match somebody with somebody.
5. the high sensitive receiver RF front-end circuit with impedance mapping function according to claim 1, its feature
It is, described divider circuit（4）, for producing multiphase clock to coordinate the passive frequency mixer to carry out lower mixing and realization
The mapping function of base band impedance.
6. the high sensitive receiver RF front-end circuit with impedance mapping function according to claim 1, its feature
It is, described passive mixer circuit（5）, for low frequency signal will to be mixed down under radiofrequency signal, and have what impedance mapped
Function, the impedance at low frequency is mapped to the radio-frequency head of the frequency centered on local frequency.
7. the high sensitive receiver RF front-end circuit with impedance mapping function according to claim 1, its feature
It is, described same phase trans-impedance amplifier（6）With orthogonal trans-impedance amplifier（7）, current signal is converted into voltage signal, and
Sending-end impedance has low-pass characteristic；Wherein, with phase trans-impedance amplifier（6）For processing in-phase signal, orthogonal trans-impedance amplifier
（7）For processing orthogonal signalling.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710235204.7A CN106888028A (en) | 2017-04-12 | 2017-04-12 | A kind of high sensitivity receiver front-ends circuit with impedance mapping function |
| PCT/CN2017/110346 WO2018188329A1 (en) | 2017-04-12 | 2017-11-10 | High-sensitivity receiver front-end circuit having impedance mapping function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710235204.7A CN106888028A (en) | 2017-04-12 | 2017-04-12 | A kind of high sensitivity receiver front-ends circuit with impedance mapping function |
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| Publication Number | Publication Date |
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| CN106888028A true CN106888028A (en) | 2017-06-23 |
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|---|---|---|---|
| CN201710235204.7A Pending CN106888028A (en) | 2017-04-12 | 2017-04-12 | A kind of high sensitivity receiver front-ends circuit with impedance mapping function |
Country Status (2)
| Country | Link |
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| CN (1) | CN106888028A (en) |
| WO (1) | WO2018188329A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018188329A1 (en) * | 2017-04-12 | 2018-10-18 | 复旦大学 | High-sensitivity receiver front-end circuit having impedance mapping function |
| CN109217887A (en) * | 2017-06-30 | 2019-01-15 | 台湾积体电路制造股份有限公司 | Very-low power consumption receiver |
| CN111130577A (en) * | 2019-11-20 | 2020-05-08 | 深圳市纽瑞芯科技有限公司 | Anti-interference receiver circuit for radio frequency transceiver chip |
| CN114499562A (en) * | 2022-01-20 | 2022-05-13 | 复旦大学 | High-sensitivity anti-blocking radio frequency receiver front end with impedance mapping function |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2018188329A1 (en) | 2018-10-18 |
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Application publication date: 20170623 |