CN106877893A - A kind of super high frequency radio frequency receiving front-end circuit - Google Patents
A kind of super high frequency radio frequency receiving front-end circuit Download PDFInfo
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- CN106877893A CN106877893A CN201510915008.5A CN201510915008A CN106877893A CN 106877893 A CN106877893 A CN 106877893A CN 201510915008 A CN201510915008 A CN 201510915008A CN 106877893 A CN106877893 A CN 106877893A
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- radio frequency
- receiving front
- high frequency
- super high
- end circuit
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
-
- 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
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
Abstract
A kind of super high frequency radio frequency receiving front-end circuit, radio frequency receiving front-end circuit is made up of novel low-noise acoustic amplifier, new 900MHz down-conversion mixers circuit.The LNA of proposition, with stronger common-mode signal and even-order harmonic rejection ability, uses second order inter-modulation current injection structures, to eliminate third order intermodulation electric current, so as to improve the linearity of frequency mixer using differential type input, output circuit structure in input；The output end of LNA is connected in the form of MOS connects electric capacity, by finally realizing that working frequency is adjustable；The frequency mixer of proposition is using differential type input, output circuit structure, with stronger common-mode signal and even-order harmonic rejection ability, circuit structure Striking symmetry, second order inter-modulation current injection structures are used in the input of the circuit, to eliminate third order intermodulation electric current, the noise characteristic of frequency mixer is improved using dynamic current injecting structure in output end.
Description
Art
The present invention relates to a kind of super high frequency radio frequency receiving front-end circuit, it is adaptable to super high frequency radio frequency field.
Background technology
Super high frequency radio frequency identification technology development in each band limits is very fast, and it is operated in 840~' the super high frequency radio frequency in 960MHz frequency band ranges recognizes (UHF RFID) system just gradually along the trend fast development forward of low-power consumption, low cost, high efficiency and high throughput.In ultrahigh-frequency radio-frequency identification system, the design of RF front-end circuit becomes extremely important in ultrahigh frequency reader-writer.
Super high frequency radio frequency recognition read-write machine is made up of transmitter and receiver, and most of read write line is to realize that its circuit structure is numerous and diverse and power consumption is big by discrete component.The present Research of ultrahigh frequency reader-writer is summarized as follows：Read write line is operated in listen patterns and talk patterns, and high sensitivity and low noise are the leading indicators under listen mode of operations, high linearity is then the leading indicator under talk mode of operations, by the switching to listen patterns and talk patterns, realizes the communication between read write line and label.In the design of hyperfrequency, by the improvement to transmitter and receiver circuit structure, the raising of respective performances can be caused, but it to reduce some performances is cost to be also simultaneously, such as improves noiseproof feature, but reduces the linearity and has much room for improvement.In circuit design, power consumption is one of the parameter for having to consider, in current design, some schemes are obtained in that the good linearity and sensitivity, but power consumption very big [3,4J;There is self-interference in super high frequency radio frequency recognition read-write machine, its corresponding cancellation scheme is suggested, wherein interference signal is down-converted to direct current signal and then eliminated again by zero-if architecture.In research in the past, super high frequency radio frequency identification RF front-end circuit is all in an operation at frequencies, it is impossible to realize that working frequency is adjustable, if it is possible to realize that working frequency is adjustable, is capable of achieving the flexible switching of working frequency, then more convenient in actual use.
The content of the invention
The present invention provides a kind of radio frequency receiving front-end circuit, is applied in super high frequency radio frequency identifier, with stronger common-mode signal and even-order harmonic rejection ability, improves the linearity and mixer gain of frequency mixer, the characteristics of with low-power consumption, reduces noise.
The technical solution adopted in the present invention is.
First, propose a kind of low-voltage, low-power consumption, high linearity, the adjustable novel low-noise acoustic amplifier of working frequency, the LNA of proposition is using differential type input, output circuit structure, with stronger common-mode signal and even-order harmonic rejection ability, second order inter-modulation current injection structures are used in input, to eliminate third order intermodulation electric current, so as to improve the linearity of frequency mixer；The output end of LNA is connected in the form of MOS connects electric capacity, by finally realizing that working frequency is adjustable, the adjustable defect of working frequency can not be realized so as to compensate for traditional LNA structures；And the operating voltage of the LNA for proposing is 1.2V, circuital current is small, the characteristics of with low-power consumption.
Secondly, it is proposed that the new 900MHz down-conversion mixers of a kind of new low-power consumption, low noise and high linearity.The frequency mixer of proposition is using differential type input, output circuit structure, with stronger common-mode signal and even-order harmonic rejection ability, circuit structure Striking symmetry uses second order inter-modulation current injection structures in the input of the circuit, to eliminate third order intermodulation electric current, so as to improve the linearity of frequency mixer；The noise characteristic of frequency mixer is improved using dynamic current injecting structure in output end, the function of dynamic current injecting structure is similar to using the complementary structure of mutual conductance, all it is by increasing mutual conductance, so as to improve mixer gain, noise is reduced, so as to the relatively large defect of the noise coefficient for eliminating traditional double balanced Gilbert mixers.
The main cascade differential pair tube being made up of M4-M7 pipes of the low-noise amplifier is realized amplifying.The structure of cascade can greatly improve the isolation of each port signal.In order to improve the linearity of LNA, employ the method for second order inter-modulation electric current injection to improve the linearity.M1, M2 constitute second order inter-modulation injecting structure, and in a pair of differential pair tubes, M3 is mainly as produced by the non-linear I-V characteristic of active device.Four groups of switching capacities are connected with the output end of LNA, every group of switching capacity is made up of an electric capacity and a NMOS tube, respectively B0, B1, B2 and B3, by controlling NMOS tube to turn it on and ending, obtains different capacitances, namely the regulation of electric capacity is realized, electric capacity and the inductance of output end form tuning network.
In the down-conversion mixer circuit, M4 and MS composition transconductance stages, M6, M7, M8 and M9 are switching stage, and R1 and R2 is output stage, and M1 and M2 is second order inter-modulation injecting structure, MP1, MP2 and MP3 composition dynamic current injecting structure.The circuit employs second order inter-modulation current injection structures to improve the linearity in input, uses dynamic current injecting structure to reduce noise in output end.Dynamic current injection circuit is completed by MPl and MP2, and two grids of PMOS are connected with the source electrode of switching tube, and MP3 here functions as the effect of current source.When the transistor for switching centering is close to be simultaneously turned on, the voltage of A (B) points reaches minimum, then the conducting of MP1 and MP2 pipes, now to A (B) point Injection Currents Id.When the transistor for switching centering is not simultaneously turned on, the voltage of A (B) points is raised, and PMOS cut-off is not injected into electric current.This technology can greatly reduce the flicker noise of frequency mixer, and dialogue noiseproof feature but has little to no effect.
Radiofrequency signal in the ultra-high frequency RFID radio-frequency receiver is by after antenna, TR (transmission/receive) switches and bandpass filter (BPF), signal is amplified by low-noise amplifier, gain is further improved by second level amplifier again, then radiofrequency signal eventually passes wave filter and obtains desired fundamental frequency signal into low frequency signal is dropped to after frequency mixer.
The beneficial effects of the invention are as follows：With stronger common-mode signal and even-order harmonic rejection ability, the linearity and mixer gain of frequency mixer are improve, the characteristics of with low-power consumption, reduce noise.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is amplifier circuit in low noise of the invention.
Fig. 2 is down-conversion mixer circuit of the invention.
Fig. 3 is radio frequency receiver structure block diagram of the invention.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Such as the cascade differential pair tube realization amplification that Fig. 1, low-noise amplifier are mainly made up of M4-M7 pipes.The structure of cascade can greatly improve the isolation of each port signal.In order to improve the linearity of LNA, employ the method for second order inter-modulation electric current injection to improve the linearity.M1, M2 constitute second order inter-modulation injecting structure, and in a pair of differential pair tubes, M3 is mainly as produced by the non-linear I-V characteristic of active device.Four groups of switching capacities are connected with the output end of LNA, every group of switching capacity is made up of an electric capacity and a NMOS tube, respectively B0, B1, B2 and B3, by controlling NMOS tube to turn it on and ending, obtains different capacitances, namely the regulation of electric capacity is realized, electric capacity and the inductance of output end form tuning network.
Such as Fig. 2, in down-conversion mixer circuit, M4 and MS composition transconductance stages, M6, M7, M8 and M9 are switching stage, and R1 and R2 is output stage, and M1 and M2 is second order inter-modulation injecting structure, MP1, MP2 and MP3 composition dynamic current injecting structure.The circuit employs second order inter-modulation current injection structures to improve the linearity in input, uses dynamic current injecting structure to reduce noise in output end.Dynamic current injection circuit is completed by MPl and MP2, and two grids of PMOS are connected with the source electrode of switching tube, and MP3 here functions as the effect of current source.When the transistor for switching centering is close to be simultaneously turned on, the voltage of A (B) points reaches minimum, then the conducting of MP1 and MP2 pipes, now to A (B) point Injection Currents Id.When the transistor for switching centering is not simultaneously turned on, the voltage of A (B) points is raised, and PMOS cut-off is not injected into electric current.This technology can greatly reduce the flicker noise of frequency mixer, and dialogue noiseproof feature but has little to no effect.
Such as Fig. 3, radiofrequency signal in ultra-high frequency RFID radio-frequency receiver is by after antenna, TR (transmission/receive) switches and bandpass filter (BPF), signal is amplified by low-noise amplifier, gain is further improved by second level amplifier again, then radiofrequency signal eventually passes wave filter and obtains desired fundamental frequency signal into low frequency signal is dropped to after frequency mixer.
Claims (8)
1. a kind of super high frequency radio frequency receiving front-end circuit, it is characterized in that：Described radio frequency receiving front-end circuit is made up of novel low-noise acoustic amplifier, new 900MHz down-conversion mixers circuit.
2. a kind of super high frequency radio frequency receiving front-end circuit according to claim 1, it is characterized in that：Radiofrequency signal in the ultra-high frequency RFID radio-frequency receiver is by after antenna, TR (transmission/receive) switches and bandpass filter (BPF), signal is amplified by low-noise amplifier, gain is further improved by second level amplifier again, then radiofrequency signal eventually passes wave filter and obtains desired fundamental frequency signal into low frequency signal is dropped to after frequency mixer.
3. a kind of super high frequency radio frequency receiving front-end circuit according to claim 1, it is characterized in that：The main cascade differential pair tube being made up of M4-M7 pipes of described low-noise amplifier is realized amplifying.
4. a kind of super high frequency radio frequency receiving front-end circuit according to claim 1, it is characterized in that：The method that the low-noise amplifier employs the injection of second order inter-modulation electric current improves the linearity.
5.
A kind of super high frequency radio frequency receiving front-end circuit according to claim 1, it is characterized in that：In the amplifier circuit in low noise, M1, M2 constitute second order inter-modulation injecting structure, and M3 is mainly as produced by the non-linear I-V characteristic of active device.
6. a kind of super high frequency radio frequency receiving front-end circuit according to claim 1, it is characterized in that：In the amplifier circuit in low noise, four groups of switching capacities are connected with the output end of LNA, every group of switching capacity is made up of an electric capacity and a NMOS tube, respectively B0, B1, B2 and B3, by controlling NMOS tube to turn it on and ending.
7. a kind of super high frequency radio frequency receiving front-end circuit according to claim 1, it is characterized in that：In the down-conversion mixer circuit, M4 and MS composition transconductance stages, M6, M7, M8 and M9 are switching stage, and R1 and R2 is output stage, and M1 and M2 is second order inter-modulation injecting structure.
8. a kind of super high frequency radio frequency receiving front-end circuit according to claim 1, it is characterized in that：In the down-conversion mixer circuit, MP1, MP2 and MP3 composition dynamic current injecting structure, input employ second order inter-modulation current injection structures to improve the linearity, use dynamic current injecting structure to reduce noise in output end.
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| CN201510915008.5A CN106877893A (en) | 2015-12-14 | 2015-12-14 | A kind of super high frequency radio frequency receiving front-end circuit |
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| CN201510915008.5A CN106877893A (en) | 2015-12-14 | 2015-12-14 | A kind of super high frequency radio frequency receiving front-end circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019227295A1 (en) * | 2018-05-28 | 2019-12-05 | 华为技术有限公司 | Signal processing device and signal processing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019227295A1 (en) * | 2018-05-28 | 2019-12-05 | 华为技术有限公司 | Signal processing device and signal processing method |
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Application publication date: 20170620 |
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