CN204721354U - Radio frequency transceiver and radio-frequency (RF) local oscillator thereof leak restraining device - Google Patents
Radio frequency transceiver and radio-frequency (RF) local oscillator thereof leak restraining device Download PDFInfo
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Abstract
The utility model relates to a kind of radio frequency transceiver and radio-frequency (RF) local oscillator reveals restraining device, and the amplitude that DC shift adjuster control DC shift adjusting part exports the DC shift level of digital baseband to is successively decreased to the reverse maximum preset by the forward maximum preset by default step-length.Signal amplitude detection circuit supervision local oscillator leakage signals also carries corresponding level signal to level detector.When DC shift adjuster extracts the level signal generation saltus step that signal amplitude detection circuit sends corresponding DC shift level amplitude and calculate DC shift value, then control DC shift adjusting part according to DC shift value and carry out local oscillator leakage suppression process, offset the DC shift of radio frequency transceiver transmitting chain itself.The local oscillator leakage signals that radio frequency transceiver produces is carried out monitoring and is found transmitting chain local-oscillator leakage minimum point, does not need analog to digital converter, reduces chip area and power consumption, reduce cost.
Description
Technical field
The utility model relates to wireless communication technique field, particularly relates to a kind of radio frequency transceiver and radio-frequency (RF) local oscillator leakage restraining device thereof.
Background technology
Along with the development and progress of radio frequency and semiconductor process techniques, seek low-voltage, low-power consumption, miniaturized radio frequency transceiver demand in continuous enhancing, the Direct conversion technology based on quadrature modulation obtains and develops rapidly.No matter be for zero-intermediate-frequency transmitter or Low Medium Frequency transmitter, before up-conversion mixer, adopt direct-coupled form all can produce local-oscillator leakage, these local-oscillator leakages can be gone out by antenna transmission, the reception of interference useful signal, causes very large impact to the performance of whole transmitter simultaneously.
After testing circuit is generally added in frequency mixer or power amplifier by traditional local-oscillator leakage restraining device, by detecting the amplitude transmitted, and then by analog to digital converter output digit signals to MCU (Microcontroller, micro-control unit) process, and then regulate corresponding analog module to realize the suppression of local-oscillator leakage, much extra analog module can be increased like this, add area and the power consumption of chip, and regulation mechanism be too complicated.There is the high shortcoming of cost in traditional local-oscillator leakage restraining device.
Utility model content
Based on this, be necessary for the problems referred to above, radio frequency transceiver and radio-frequency (RF) local oscillator leakage restraining device thereof that a kind of cost is low are provided.
The radio-frequency (RF) local oscillator of radio frequency transceiver reveals a restraining device, comprises signal amplitude detection circuit, controller and DC shift adjusting part; Described DC shift adjusting part is arranged at the digital baseband of radio frequency transceiver, described controller comprises DC shift adjuster and level detector, described DC shift adjuster connects described DC shift adjusting part, and described level detector connects described DC shift adjuster and signal amplitude detection circuit;
Described DC shift adjuster controls DC shift adjusting part and exports DC shift level to described digital baseband, and the amplitude of described DC shift level is successively decreased to the reverse maximum preset by the forward maximum preset by default step-length; Described signal amplitude detection circuit receives local oscillator leakage signals to carry out being converted to DC level, and export the first level signal when the amplitude of described DC level is more than or equal to the amplitude of benchmark DC level to described level detector, export second electrical level signal when the amplitude of described DC level is less than the amplitude of benchmark DC level to described level detector;
Described DC shift adjuster obtains when described level detector detects the level signal generation saltus step that described signal amplitude detection circuit exports and is correspondingly delivered to the amplitude of the DC shift level of digital baseband and calculates DC shift value, and controls described DC shift adjusting part according to described DC shift value and carry out local oscillator leakage and suppress process.
A kind of radio frequency transceiver, comprise digital baseband, modulation /demodulation module, digital to analog converter, low pass filter, up-conversion mixer, power amplifier, low noise amplifier, down-conversion mixer, complex filter, analog to digital converter, transformer and dual-mode antenna, also comprise above-mentioned radio-frequency (RF) local oscillator and reveal restraining device, described digital baseband connects described modulation /demodulation module, modulation module in described modulation /demodulation module connects described digital to analog converter, demodulation module in described modulation /demodulation module connects described analog to digital converter, described up-conversion mixer connects described digital to analog converter by described low pass filter, and connect described power amplifier, described down-conversion mixer connects described analog to digital converter by described complex filter, and connect described low noise amplifier, described transformer connects described power amplifier, low noise amplifier and dual-mode antenna, described DC shift adjusting part is arranged at digital baseband, and described signal amplitude detection circuit connects described low noise amplifier.
Above-mentioned radio frequency transceiver and radio-frequency (RF) local oscillator thereof reveal restraining device, and the amplitude that DC shift adjuster control DC shift adjusting part exports the DC shift level of digital baseband to is successively decreased to the reverse maximum preset by the forward maximum preset by default step-length.Signal amplitude detection circuit supervision local oscillator leakage signals also carries corresponding level signal to level detector.When DC shift adjuster extracts the level signal generation saltus step that signal amplitude detection circuit sends corresponding DC shift level amplitude and calculate DC shift value, then control DC shift adjusting part according to DC shift value and carry out local oscillator leakage suppression process, offset the DC shift of radio frequency transceiver transmitting chain itself.The local oscillator leakage signals that radio frequency transceiver produces is carried out monitoring and is found transmitting chain local-oscillator leakage minimum point, does not need analog to digital converter, reduces chip area and power consumption, reduce cost.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of the radio-frequency (RF) local oscillator leakage restraining device of radio frequency transceiver in an embodiment;
Fig. 2 is the structure chart that in an embodiment, radio frequency transceiver and radio-frequency (RF) local oscillator thereof reveal restraining device;
Fig. 3 is the correction principle schematic diagram of radio frequency transceiver local-oscillator leakage in an embodiment.
Embodiment
The radio-frequency (RF) local oscillator of radio frequency transceiver reveals a restraining device, as shown in Figure 1, comprises signal amplitude detection circuit 110, controller 120 and DC shift adjusting part 130.DC shift adjusting part 130 is arranged at the digital baseband of radio frequency transceiver, controller 120 comprises DC shift adjuster and level detector, DC shift adjuster connects DC shift adjusting part, and level detector connects DC shift adjuster and signal amplitude detection circuit.
DC shift adjuster exports DC shift level to digital baseband for controlling DC shift adjusting part 130, and the amplitude of DC shift level is successively decreased to the reverse maximum preset by the forward maximum preset by default step-length.The amplitude of DC shift level there will be to diminish and becomes large process again, and the concrete value of forward maximum and reverse maximum can adjust according to actual conditions.Signal amplitude detection circuit 110 carries out being converted to DC level for receiving local oscillator leakage signals, and export the first level signal when the amplitude of DC level is more than or equal to the amplitude of benchmark DC level to level detector, export second electrical level signal when the amplitude of DC level is less than the amplitude of benchmark DC level to level detector.
DC shift adjuster obtains when level detector detects the level signal generation saltus step that signal amplitude detection circuit 110 exports and is correspondingly delivered to the amplitude of the DC shift level of digital baseband and calculates DC shift value, and controls DC shift adjusting part 130 according to DC shift value and carry out local oscillator leakage and suppress process.
In the present embodiment, signal amplitude detection circuit 110 connects the low noise amplifier of radio frequency transceiver, the local oscillator leakage signals receiving low noise amplifier output carries out being converted to DC level, carries out monitoring searching local-oscillator leakage minimum point to the local oscillator leakage signals that low noise amplifier exports.Be appreciated that in other embodiments, signal amplitude detection circuit 110 also can be connect up-conversion mixer or power amplifier, changes the local oscillator leakage signals that up-conversion mixer or power amplifier export.
Signal amplitude detection circuit 110, under the condition of work of normal transmitting-receiving, is mainly used for detecting the size from the radiofrequency signal of radio frequency transceiver antenna, but can be used to when starting shooting and powering on suppress local-oscillator leakage.Signal amplitude detection circuit 110 is placed after the low noise amplifiers, and low noise amplifier is exaggerated the local oscillator leakage signals from transmitting chain simultaneously, is conducive to the detection to local oscillator leakage signals amplitude.The present embodiment middle controller 120 is digital logic controller, and reliability is high and antijamming capability strong, improves testing reliability.
The digital to analog converter of radio frequency transceiver, low pass filter, up-conversion mixer, power amplifier, transformer and dual-mode antenna form transmitting chain, transmitting chain is unavoidable in real work has DC shift, and these DC shifts are by having local oscillator leakage out by power amplifier after up-conversion mixing.The local oscillator leakage signals that low noise amplifier exports is monitored by the amplitude adjusting the output to the DC shift level of digital baseband simultaneously, find the amplitude of corresponding DC shift level during transmitting chain local-oscillator leakage minimum point to obtain DC shift value.Carry out local oscillator leakage according to DC shift value and suppress process, specifically can produce amplitude at digital baseband and be DC shift value and the direction DC shift level contrary with transmitting chain local-oscillator leakage, by local oscillator leakage being offset after up-conversion, thus reach the object suppressing local-oscillator leakage.Higher local-oscillator leakage rejection ratio can be realized, make local-oscillator leakage meet the requirement of Bluetooth protocol, improve the performance of whole radio frequency transceiver.
Wherein in an embodiment, as shown in Figure 2, signal amplitude detection circuit 110 comprises envelope detector 114, reference level produces circuit (not shown) and comparator 116, envelope detector 114 can connect low noise amplifier 260, and comparator 116 connects reference level and produces circuit, envelope detector 114 and level detector.
Reference level produces circuit output reference DC level to comparator 116, and envelope detector 114 is converted to DC level to the local oscillator leakage signals received and is delivered to the input of comparator 116.
Comparator 116 exports the first level signal to level detector when the amplitude of DC level is more than or equal to the amplitude of benchmark DC level, export second electrical level signal to level detector when the amplitude of DC level is less than the amplitude of benchmark DC level.
The effect of envelope detector 114 changes local oscillator leakage signals, converts radiofrequency signal to DC level signal, and corresponding different radiofrequency signals, exports different DC level and substantially linearly change.In the present embodiment, the output of envelope detector 114 is provided with the electric capacity of ground connection, can filtering high frequency spurs.Reference level produces circuit and produces a benchmark DC level, compares for the DC level detected with envelope detector 114.Comparator 116 compares the DC level of envelope detector 114 output and the benchmark DC level of reference level generation circuit generation, in the present embodiment, the first level signal is high level, second electrical level signal is low level, comparator 116 exports high level when the amplitude of DC level is more than or equal to the amplitude of benchmark DC level, the output low level when the amplitude of DC level is less than the amplitude of benchmark DC level.
Along with the amplitude of the DC shift level exporting digital baseband to is successively decreased to the reverse maximum preset by the forward maximum preset by default step-length, the signal that comparator 116 exports first becomes low level by high level, then becomes high level by low level.Controller 120 obtains the corresponding amplitude exporting the DC shift level of digital baseband to when twice level saltus step, the mean value calculating two amplitudes obtains DC shift value.
Further, wherein in an embodiment, signal amplitude detection circuit 110 also can comprise signal amplitude amplifier 112, and envelope detector 114 connects low noise amplifier 260 by signal amplitude amplifier 112.
Signal amplitude amplifier 112 also can possess detection function, local oscillator leakage signals can be separated from high-frequency signal, be convenient to input.Signal amplitude amplifier 112 is delivered to envelope detector 114 after amplifying the local oscillator leakage signals received, and envelope detector 114 is converted to DC level to the signal after amplification and is delivered to comparator 116.Carry out amplification by signal amplitude amplifier 112 pairs of local oscillator leakage signals to be beneficial to envelope detector 114 and to change, improve signal transacting accuracy.
Wherein in an embodiment, as shown in Figure 2, the device 210 of digital baseband and modulation /demodulation module composition comprises I passage and Q passage, and DC shift value comprises I channel DC drift value and Q channel DC drift value.DC shift adjusting part 130 comprises the I channel DC drift adjuster 132 being arranged at I passage and Q channel DC drift adjuster 134, the I channel DC drift adjuster 132 being arranged at Q passage is connected DC shift adjuster with Q channel DC drift adjuster 134.The figure place of I channel DC drift adjuster 132 and Q channel DC drift adjuster 134 is adjustable according to different accuracy, such as corresponding 256 of 8bit precision, corresponding 512 of 9bit precision, corresponding 1024 of 10bit precision, specifically can come choice accuracy and figure place according to suppressing the requirement of local-oscillator leakage precision.
DC shift adjuster is not when Q channel DC drift adjuster 134 exports DC shift level, the amplitude of the DC shift level that control I channel DC drift adjuster 132 exports is successively decreased to the reverse maximum preset by the forward maximum preset by default step-length, obtain correspondence when the signal generation saltus step that signal amplitude detection circuit 110 exports be delivered to the amplitude of the DC shift level of I passage and calculate I channel DC drift value, and carry out local oscillator leakage suppression process according to I channel DC drift value control I channel DC drift adjuster 132 pairs of I passages.
DC shift adjuster is after control I channel DC drift adjuster 132 pairs of I passages carry out local oscillator leakage suppression process, the amplitude of the DC shift level that control Q channel DC drift adjuster 134 exports is successively decreased to the reverse maximum preset by the forward maximum preset by default step-length, obtain correspondence when the signal generation saltus step that signal amplitude detection circuit 110 exports be delivered to the amplitude of the DC shift level of Q passage and calculate Q channel DC drift value, and carry out local oscillator leakage suppression process according to Q channel DC drift value control Q channel DC drift adjuster 134 pairs of Q passages.
Controller 120, I channel DC drift adjuster 132, Q channel DC drift adjuster 134, digital to analog converter 220, low pass filter 230, up-conversion mixer 240, power amplifier 250, low noise amplifier 260 and signal amplitude detection circuit 110 form local oscillator suppression loop, in the process that local oscillator leakage suppresses, digital baseband does not export any signal, only export DC shift, the digital signal of DC shift changes into analog signal by digital to analog converter 220, through low pass filter 230 again after up-conversion mixing 240 by the continuous amplification of power amplifier 250 and low noise amplifier 260, input to signal amplitude detection circuit 110 again to detect.The size of signal amplitude detection circuit 110 detected amplitude, and export corresponding low and high level to the level detector of controller 120.
The process that local-oscillator leakage corrects is exactly find the process of I, Q passage local-oscillator leakage minimum point, suppose that the DC shift level that base band produces is U, the signal of local oscillator is F (Lo)=sin (ω t), local-oscillator leakage then after up-conversion mixer 240 is Usin (ω t), and the larger then local-oscillator leakage of DC shift level U that digital baseband produces is larger.
Particularly, the DC shift first arranging I passage is the DC shift of forward maximum Umax, Q passage is 0.The output level of signal amplitude detection circuit 110 can be read by level detector after certain time-delay, high level can be read at the beginning, then DC shift adjuster arranges the DC shift of I passage is Umax-K, wherein K is step-length, the output level being read signal amplitude detection circuit 110 by level detector is continued after certain time-delay, circulate always, until the DC shift of I passage becomes reverse maximum-Umax, the output level of signal amplitude detection circuit 110 can be uprised by high step-down again, DC shift A and B of corresponding I passage when twice saltus step recorded by DC shift adjuster, then the DC shift value of I passage can be set to (A+B)/2, namely control I channel DC drift adjuster 132 output amplitude is (A+B)/2 and the DC shift contrary with local oscillator direction, complete and process is suppressed to the local oscillator leakage of I passage.
When regulating Q passage, the DC shift value of I passage is fixed as (A+B)/2, the adjustment process of Q passage and I channel types are seemingly, record DC shift C and D of twice saltus step, then the DC shift value of Q passage is set to (C+D)/2, completes and process is suppressed to the local oscillator leakage of Q passage.When regulating Q passage, also first I channel DC drift value can be fixed as 0, wait Q passages regulate complete, then the DC shift value of I passage is fixed as (A+B)/2, Q channel setting be (C+D)/2, also can realize the object of adjustment.After first local oscillator leakage suppression process being carried out to I passage in the present embodiment, then local oscillator leakage suppression process is carried out to Q passage.
Be illustrated in figure 3 the correction principle schematic diagram of radio frequency transceiver local-oscillator leakage, transverse axis represents the amplitude of I passage or Q channel DC drift level, and the longitudinal axis represents local oscillation leak power thereof.The amplitude of control I passage or Q channel DC drift level is decremented to reverse maximum-Umax by forward maximum Umax, the DC shift value A of I passage and B when record obtains the signal saltus step that signal amplitude detection circuit 110 exports respectively, and the DC shift value C of Q passage and D, average respectively and obtain (A+B)/2 corresponding I passage local-oscillator leakage minimum point, obtain (C+D)/2 corresponding Q passage local-oscillator leakage minimum point.
In another embodiment, the device 210 of digital baseband and modulation /demodulation module composition comprises I passage and Q passage, and DC shift value comprises I channel DC drift value and Q channel DC drift value.DC shift adjusting part 130 comprises the I channel DC drift adjuster 132 being arranged at I passage and Q channel DC drift adjuster 134, the I channel DC drift adjuster 132 being arranged at Q passage is connected DC shift adjuster with Q channel DC drift adjuster 134.
DC shift adjuster is not when I channel DC drift adjuster 132 exports DC shift level, the amplitude of the DC shift level that control Q channel DC drift adjuster 134 exports is successively decreased to the reverse maximum preset by the forward maximum preset by default step-length, obtain correspondence when the signal generation saltus step that signal amplitude detection circuit 110 exports be delivered to the amplitude of the DC shift level of Q passage and calculate Q channel DC drift value, and carry out local oscillator leakage suppression process according to Q channel DC drift value control Q channel DC drift adjuster 134 pairs of Q passages.
DC shift adjuster is after control Q channel DC drift adjuster 134 pairs of Q passages carry out local oscillator leakage suppression process, the amplitude of the DC shift level that control I channel DC drift adjuster 132 exports is successively decreased to the reverse maximum preset by the forward maximum preset by default step-length, obtain correspondence when the signal generation saltus step that signal amplitude detection circuit 110 exports be delivered to the amplitude of the DC shift level of I passage and calculate I channel DC drift value, and carry out local oscillator leakage suppression process according to I channel DC drift value control I channel DC drift adjuster 132 pairs of I passages.
After first local oscillator leakage suppression process being carried out to Q passage in the present embodiment, again local oscillator leakage is carried out to I passage and suppress process, detailed process with first carry out after local oscillator leakage suppresses process to I passage, then it is similar to carry out to Q passage the process that local oscillator leakage suppression processes, and does not repeat them here.
Below namely there is provided two kinds to the specific embodiment carrying out local oscillator leakage suppression process, processing mode can be selected according to actual conditions, improve operational suitability.
Wherein in an embodiment, DC shift adjuster connection signal amplitude detection circuit 110, if the signal generation saltus step that signal amplitude detection circuit 110 exports do not detected, DC shift adjuster is also for reducing the amplitude of benchmark DC level according to adjustment threshold value, and the amplitude again controlling the DC shift level that DC shift adjusting part 130 exports is successively decreased, until level detector detects the level signal generation saltus step that signal amplitude detection circuit 110 exports to the reverse maximum preset by the forward maximum preset by default step-length.The concrete value of adjustment threshold value can adjust according to actual conditions.
Namely be from forward maximum Umax to reverse maximum-Umax change procedure in the present embodiment at adjustment DC shift, if there is not the process uprised again by high step-down in the output level of signal amplitude detection circuit 110, benchmark DC level is reduced a gear by the DC shift adjuster of this Time Controller 120, repeat the debug process to I, Q passage again, if still read high level always, DC shift adjuster continues benchmark DC level to reduce a gear.Specifically the change of benchmark DC level is set by controlling the reference level register produced in circuit.When there is not saltus step in the signal that signal amplitude detection circuit 110 exports, debugging is re-started after the amplitude of benchmark DC level is adjusted, until the signal generation saltus step that signal amplitude detection circuit 110 exports detected, avoid because benchmark DC level arranges undue influence debug results, improve testing reliability.
The radio-frequency (RF) local oscillator of above-mentioned radio frequency transceiver reveals restraining device, and the amplitude that DC shift adjuster control DC shift adjusting part 130 exports the DC shift level of digital baseband to is successively decreased to the reverse maximum preset by the forward maximum preset by default step-length.Signal amplitude detection circuit 110 is monitored local oscillator leakage signals and is carried corresponding level signal to level detector.When DC shift adjuster extracts the level signal generation saltus step that signal amplitude detection circuit 110 sends corresponding DC shift level amplitude and calculate DC shift value, then control DC shift adjusting part 130 according to DC shift value and carry out local oscillator leakage suppression process, offset the DC shift of radio frequency transceiver transmitting chain itself.The local oscillator leakage signals that radio frequency transceiver produces is carried out monitoring and is found transmitting chain local-oscillator leakage minimum point, does not need analog to digital converter, reduces chip area and power consumption, reduce cost.Regulated by the DC shift of controller 120 pairs of digital basebands, simple and reliable, degree of regulation is high, can realize good local oscillator rejection ratio.
The utility model additionally provides a kind of radio frequency transceiver, as shown in Figure 2, comprise the device 210 of digital baseband and modulation /demodulation module composition, digital to analog converter 220, low pass filter 230, up-conversion mixer 240, power amplifier 250, low noise amplifier 260, down-conversion mixer 270, complex filter 280, analog to digital converter 290, transformer Balun, dual-mode antenna A and above-mentioned radio-frequency (RF) local oscillator reveal restraining device, digital baseband connects modulation /demodulation module, modulation module linking number weighted-voltage D/A converter 220 in modulation /demodulation module, demodulation module connection mode number converter 290 in modulation /demodulation module, up-conversion mixer 240 is by low pass filter 230 linking number weighted-voltage D/A converter 220, and connect power amplifier 250, down-conversion mixer 270 is by complex filter 280 connection mode number converter 290, and connect low noise amplifier 260, transformer Balun connects power amplifier 250, low noise amplifier 260 and dual-mode antenna A.DC shift adjusting part 130 is arranged at digital baseband, and signal amplitude detection circuit 110 connects low noise amplifier 260, and in the present embodiment, transformer Balun is balanced-unbalanced transformer.
The digital to analog converter 220 of radio frequency transceiver, low pass filter 230, up-conversion mixer 240, power amplifier 250, transformer Balun and dual-mode antenna A form transmitting chain.Controller 120, I channel DC drift adjuster 132, Q channel DC drift adjuster 134, digital to analog converter 220, low pass filter 230, up-conversion mixer 240, power amplifier 250, low noise amplifier 260 and signal amplitude detection circuit 110 form local oscillator suppression loop, in the process that local oscillator leakage suppresses, digital baseband does not export any signal, only export DC shift, the digital signal of DC shift changes into analog signal by digital to analog converter 220, through low pass filter 230 again after up-conversion mixing 240 by the continuous amplification of power amplifier 250 and low noise amplifier 260, input to signal amplitude detection circuit 110 again to detect.The size of signal amplitude detection circuit 110 detected amplitude, and export corresponding low and high level to the level detector of controller 120.
Above-mentioned radio frequency transceiver, carries out monitoring searching transmitting chain local-oscillator leakage minimum point to the amplifying signal that low noise amplifier 260 exports, is conducive to the detection of amplitude, and does not need analog to digital converter, reduce chip area and power consumption, reduce cost.Regulated by the DC shift of controller 120 pairs of digital basebands, simple and reliable, degree of regulation is high, can realize good local oscillator rejection ratio.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
The above embodiment only have expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (8)
1. the radio-frequency (RF) local oscillator of radio frequency transceiver reveals a restraining device, it is characterized in that, comprises signal amplitude detection circuit, controller and DC shift adjusting part; Described DC shift adjusting part is arranged at the digital baseband of radio frequency transceiver, described controller comprises DC shift adjuster and level detector, described DC shift adjuster connects described DC shift adjusting part, and described level detector connects described DC shift adjuster and signal amplitude detection circuit;
Described DC shift adjuster controls DC shift adjusting part and exports DC shift level to described digital baseband, and the amplitude of described DC shift level is successively decreased to the reverse maximum preset by the forward maximum preset by default step-length; Described signal amplitude detection circuit receives local oscillator leakage signals to carry out being converted to DC level, and export the first level signal when the amplitude of described DC level is more than or equal to the amplitude of benchmark DC level to described level detector, export second electrical level signal when the amplitude of described DC level is less than the amplitude of benchmark DC level to described level detector;
Described DC shift adjuster obtains when described level detector detects the level signal generation saltus step that described signal amplitude detection circuit exports and is correspondingly delivered to the amplitude of the DC shift level of digital baseband and calculates DC shift value, and controls described DC shift adjusting part according to described DC shift value and carry out local oscillator leakage and suppress process.
2. the radio-frequency (RF) local oscillator of radio frequency transceiver according to claim 1 reveals restraining device, it is characterized in that, described signal amplitude detection circuit comprises envelope detector, reference level produces circuit and comparator, described comparator connects described reference level and produces circuit, envelope detector and level detector
Described reference level produces circuit output reference DC level to described comparator, and described envelope detector is converted to DC level to the local oscillator leakage signals received and is delivered to described comparator;
Described comparator exports the first level signal to described level detector when the amplitude of described DC level is more than or equal to the amplitude of benchmark DC level, export second electrical level signal to described level detector when the amplitude of described DC level is less than the amplitude of benchmark DC level.
3. the radio-frequency (RF) local oscillator of radio frequency transceiver according to claim 2 reveals restraining device, and it is characterized in that, described signal amplitude detection circuit also comprises signal amplitude amplifier,
Described signal amplitude amplifier is delivered to described envelope detector after amplifying the local oscillator leakage signals received, and described envelope detector is converted to DC level to the signal after amplification and is delivered to described comparator.
4. the radio-frequency (RF) local oscillator of radio frequency transceiver according to claim 1 reveals restraining device, and it is characterized in that, described digital baseband comprises I passage and Q passage, and described DC shift value comprises I channel DC drift value and Q channel DC drift value; Described DC shift adjusting part comprises the I channel DC drift adjuster being arranged at I passage and the Q channel DC drift adjuster being arranged at Q passage, and described I channel DC drift adjuster is connected described DC shift adjuster with Q channel DC drift adjuster,
Described DC shift adjuster is not when described Q channel DC drift adjuster exports DC shift level, the amplitude controlling the DC shift level that described I channel DC drift adjuster exports is successively decreased to the reverse maximum preset by the forward maximum preset by default step-length, obtain correspondence when the signal generation saltus step that signal amplitude detection circuit exports be delivered to the amplitude of the DC shift level of I passage and calculate I channel DC drift value, and according to described I channel DC drift value control described I channel DC drift adjuster to I passage carry out local oscillator leakage suppress process,
Described DC shift adjuster is after control described I channel DC drift adjuster carries out local oscillator leakage suppression process to I passage, the amplitude controlling the DC shift level that described Q channel DC drift adjuster exports is successively decreased to the reverse maximum preset by the forward maximum preset by default step-length, obtain correspondence when the signal generation saltus step that signal amplitude detection circuit exports be delivered to the amplitude of the DC shift level of Q passage and calculate Q channel DC drift value, and according to described Q channel DC drift value control described Q channel DC drift adjuster to Q passage carry out local oscillator leakage suppress process.
5. the radio-frequency (RF) local oscillator of radio frequency transceiver according to claim 1 reveals restraining device, and it is characterized in that, described digital baseband comprises I passage and Q passage, and described DC shift value comprises I channel DC drift value and Q channel DC drift value; Described DC shift adjusting part comprises the I channel DC drift adjuster being arranged at I passage and the Q channel DC drift adjuster being arranged at Q passage, and described I channel DC drift adjuster is connected described DC shift adjuster with Q channel DC drift adjuster,
Described DC shift adjuster is not when described I channel DC drift adjuster exports DC shift level, the amplitude controlling the DC shift level that described Q channel DC drift adjuster exports is successively decreased to the reverse maximum preset by the forward maximum preset by default step-length, obtain correspondence when the signal generation saltus step that signal amplitude detection circuit exports be delivered to the amplitude of the DC shift level of Q passage and calculate Q channel DC drift value, and according to described Q channel DC drift value control described Q channel DC drift adjuster to Q passage carry out local oscillator leakage suppress process,
Described DC shift adjuster is after control described Q channel DC drift adjuster carries out local oscillator leakage suppression process to Q passage, the amplitude controlling the DC shift level that described I channel DC drift adjuster exports is successively decreased to the reverse maximum preset by the forward maximum preset by default step-length, obtain correspondence when the signal generation saltus step that signal amplitude detection circuit exports be delivered to the amplitude of the DC shift level of I passage and calculate I channel DC drift value, and according to described I channel DC drift value control described I channel DC drift adjuster to I passage carry out local oscillator leakage suppress process.
6. the radio-frequency (RF) local oscillator of the radio frequency transceiver according to claim 1-5 any one reveals restraining device, and it is characterized in that, described controller is digital logic controller.
7. a radio frequency transceiver, it is characterized in that, comprise digital baseband, modulation /demodulation module, digital to analog converter, low pass filter, up-conversion mixer, power amplifier, low noise amplifier, down-conversion mixer, complex filter, analog to digital converter, transformer and dual-mode antenna, the radio-frequency (RF) local oscillator also comprised described in claim 1 to 6 any one reveals restraining device, described digital baseband connects described modulation /demodulation module, modulation module in described modulation /demodulation module connects described digital to analog converter, demodulation module in described modulation /demodulation module connects described analog to digital converter, described up-conversion mixer connects described digital to analog converter by described low pass filter, and connect described power amplifier, described down-conversion mixer connects described analog to digital converter by described complex filter, and connect described low noise amplifier, described transformer connects described power amplifier, low noise amplifier and dual-mode antenna, described DC shift adjusting part is arranged at digital baseband, and described signal amplitude detection circuit connects described low noise amplifier.
8. radio frequency transceiver according to claim 7, is characterized in that, described transformer is Ba Lun transformer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520395497.1U CN204721354U (en) | 2015-06-09 | 2015-06-09 | Radio frequency transceiver and radio-frequency (RF) local oscillator thereof leak restraining device |
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|---|---|---|---|
| CN201520395497.1U CN204721354U (en) | 2015-06-09 | 2015-06-09 | Radio frequency transceiver and radio-frequency (RF) local oscillator thereof leak restraining device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883203A (en) * | 2015-06-09 | 2015-09-02 | 珠海市杰理科技有限公司 | Radio-frequency transceiver and radio-frequency local oscillator leakage inhibition apparatus thereof |
| CN107547145A (en) * | 2016-06-27 | 2018-01-05 | 中兴通讯股份有限公司 | A kind of detection method and device of local oscillator leakage signals |
| CN108183722A (en) * | 2016-12-08 | 2018-06-19 | 博通集成电路（上海）股份有限公司 | Electronic charging receiver and its operation method |
| CN112436857A (en) * | 2020-07-21 | 2021-03-02 | 珠海市杰理科技股份有限公司 | Detection circuit and detection method, wireless radio frequency transceiver and electrical equipment |
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2015
- 2015-06-09 CN CN201520395497.1U patent/CN204721354U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883203A (en) * | 2015-06-09 | 2015-09-02 | 珠海市杰理科技有限公司 | Radio-frequency transceiver and radio-frequency local oscillator leakage inhibition apparatus thereof |
| CN107547145A (en) * | 2016-06-27 | 2018-01-05 | 中兴通讯股份有限公司 | A kind of detection method and device of local oscillator leakage signals |
| CN107547145B (en) * | 2016-06-27 | 2021-10-12 | 中兴通讯股份有限公司 | Method and device for detecting local oscillator leakage signal |
| CN108183722A (en) * | 2016-12-08 | 2018-06-19 | 博通集成电路（上海）股份有限公司 | Electronic charging receiver and its operation method |
| CN108183722B (en) * | 2016-12-08 | 2020-03-17 | 博通集成电路（上海）股份有限公司 | Electronic toll receiver and method for operating the same |
| CN112436857A (en) * | 2020-07-21 | 2021-03-02 | 珠海市杰理科技股份有限公司 | Detection circuit and detection method, wireless radio frequency transceiver and electrical equipment |
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