CN105207627A - Phase calibration structure of magnetic resonance radio frequency power amplifier - Google Patents
Phase calibration structure of magnetic resonance radio frequency power amplifier Download PDFInfo
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- CN105207627A CN105207627A CN201510573601.6A CN201510573601A CN105207627A CN 105207627 A CN105207627 A CN 105207627A CN 201510573601 A CN201510573601 A CN 201510573601A CN 105207627 A CN105207627 A CN 105207627A
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Abstract
The invention relates to a phase calibration structure of a magnetic resonance radio frequency power amplifier. The magnetic resonance radio frequency power amplifier comprises power amplification modules of N power amplifier tubes and a power synthesis module, wherein the power synthesis module is used for power amplification and synthesis of N input signals. The phase calibration structure is characterized by comprising N phase shifters, N phase discriminators and N directional couplers; each input signal of N input signals is connected with one phase shifter and then connected with an input end of one power amplifier tube in one power amplification module, an output end of the power amplification tube is connected with an input end of one directional coupler, and an output end of the directional coupler is connected with one phase discriminator and then connected with a phase shifter input end corresponding to the signal; besides, output ends of all the power amplifier tubes are connected with the power synthesis module. The phase calibration structure has the advantages as follows: the phase difference generated by the power amplifier tubes is automatically compensated, phases of the output signals are consistent, and the optimum synthesis efficiency is realized.
Description
Technical field
The present invention relates to a kind of phase alignment structure of magnetic resonance radio frequency power amplifier.
Background technology
The structure of current magnetic resonance radio frequency power amplifier is see shown in accompanying drawing 1, input signal be S1 (in)=S2 (in)=...=Sn (in), each road input signal is after a power amplifier tube, input signal is amplified to S1 (out), S2 (out), Sn (out).In theory, we wish that defeated N road input signal is after power amplifier tube, and the output signal obtained is also completely equal, and each input signal and output signal have Two Variables, and one be gain, two is phase places; But in fact due to the inconsistency of each power amplifier tube, especially magnetic nuclear resonance radio frequency power amplification tube power is all larger, single power amplifier tube can reach more than 1.5KW, is therefore difficult to ensure when amplitude and the phase place of the input signal of every road power amplifier tube keep the same, obtains the phase place that outputs signal and amplitude also keep consistency.Therefore, although the phase place of input signal and amplitude are identical, after power amplifier tube, phase place and amplitude different, different signal carries out Vector modulation through synthesizer again, and result causes final Output rusults and desired design result to produce raw relatively large deviation.Perfect condition: S (out)=S1 (out)+S2 (out)+... + Sn (out); But, due to output signal gain and phase place inconsistent, the truth obtained is: S (out) <S1 (out)+S2 (out)+... + Sn (out)+IL+Error; Wherein IL is the insertion loss of power combiner, and Error is the inconsistent Vector modulation loss caused due to phase place.
Therefore, being badly in need of one can when power combing, can the phase techniques of automatic calibration multichannel power amplifier module accurately, can improve the combined coefficient of magnetic resonance radio frequency power amplifier.
Summary of the invention
Technical problem to be solved by this invention is the phase alignment structure providing a kind of magnetic resonance radio frequency power amplifier for above-mentioned prior art, automatically to calibration multichannel power model phase place, thus each road balance and the combined coefficient thereof of magnetic resonance radio frequency power amplifier can be improved.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of phase alignment structure of magnetic resonance radio frequency power amplifier, wherein magnetic resonance radio frequency power amplifier comprises the power amplifier module of N number of power amplifier tube, with power combing module, for carrying out power amplification and synthesis to N road input signal, it is characterized in that: described phase alignment structure comprises: N number of phase shifter, N number of phase discriminator and N number of directional coupler, in the input signal of N road, be connected with the input of the power amplifier tube of in power amplifier module after each road input signal connects a phase shifter, the output of this power amplifier tube connects the input of a directional coupler, the output of this directional coupler connects phase shifter inputs corresponding to a phase discriminator Hou Yugai road, in addition, the output of each road power amplifier tube is all connected to power combing module, namely output signal is coupled to phase discriminator through a directional coupler by the output signal of each road power amplifier tube, phase of output signal is read by this phase discriminator, then the phase place of movement is needed according to the Selecting phasing phase shifter of output signal, final realization compensates the phase difference that power amplifier tube produces, thus ensure that every road phase of output signal is consistent.
Preferably, described phase shifter is the switch matrix type phase shifter including N number of outgoing position.
Compared with prior art, the invention has the advantages that: output signal is coupled to phase discriminator through a directional coupler by the output signal of each road power amplifier tube, phase of output signal is read by this phase discriminator, then the phase place of movement is needed according to the Selecting phasing phase shifter of output signal, final realization compensates the phase difference that power amplifier tube produces, thus ensure that every road phase of output signal is consistent, reach best combined coefficient.
Accompanying drawing explanation
Fig. 1 is the block diagram of magnetic resonance radio frequency power amplifier in prior art.
Fig. 2 is the block diagram of magnetic resonance radio frequency power amplifier and phase alignment structure in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
The phase alignment structure of a kind of magnetic resonance radio frequency power amplifier as shown in Figure 2, wherein magnetic resonance radio frequency power amplifier comprises the power amplifier module of N number of power amplifier tube, with power combing module, for to N road input signal S1 (in), S2 (in), Sn (in) carries out power amplification and synthesis, described phase alignment structure comprises: N number of switch matrix type phase shifter with N number of outgoing position, N number of phase discriminator and N number of directional coupler, in the input signal of N road, be connected with the input of the power amplifier tube of in power amplifier module after each road input signal connects a phase shifter, the output of this power amplifier tube connects the input of a directional coupler, the output of this directional coupler connects phase shifter inputs corresponding to a phase discriminator Hou Yugai road, in addition, the output of each road power amplifier tube is all connected to power combing module, the operation principle of this phase alignment structure is: output signal is coupled to phase discriminator through a directional coupler by the output signal of each road power amplifier tube, phase of output signal is read by this phase discriminator, then according to the outgoing position of the Selecting phasing phase shifter matrix of output signal, changed by the phase place of phase shifter to input signal, final realization compensates the phase difference that power amplifier tube produces, thus ensure that every road phase of output signal is consistent, reach best combined coefficient.
Above-mentioned phase discriminator and phase shifter can make digitally to realize, and analog form also can be adopted to realize.
Claims (2)
1. the phase alignment structure of a magnetic resonance radio frequency power amplifier, wherein magnetic resonance radio frequency power amplifier comprises the power amplifier module of N number of power amplifier tube, with power combing module, for carrying out power amplification and synthesis to N road input signal, it is characterized in that: described phase alignment structure comprises: N number of phase shifter, N number of phase discriminator and N number of directional coupler, in the input signal of N road, be connected with the input of the power amplifier tube of in power amplifier module after each road input signal connects a phase shifter, the output of this power amplifier tube connects the input of a directional coupler, the output of this directional coupler connects phase shifter inputs corresponding to a phase discriminator Hou Yugai road, in addition, the output of each road power amplifier tube is all connected to power combing module, namely output signal is coupled to phase discriminator through a directional coupler by the output signal of each road power amplifier tube, phase of output signal is read by this phase discriminator, then the phase place of movement is needed according to the Selecting phasing phase shifter of output signal, final realization compensates the phase difference that power amplifier tube produces, thus ensure that every road phase of output signal is consistent.
2. phase alignment structure according to claim 1, is characterized in that: described phase shifter is the switch matrix type phase shifter including N number of outgoing position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510573601.6A CN105207627A (en) | 2015-09-10 | 2015-09-10 | Phase calibration structure of magnetic resonance radio frequency power amplifier |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510573601.6A CN105207627A (en) | 2015-09-10 | 2015-09-10 | Phase calibration structure of magnetic resonance radio frequency power amplifier |
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| CN105207627A true CN105207627A (en) | 2015-12-30 |
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| CN201510573601.6A Pending CN105207627A (en) | 2015-09-10 | 2015-09-10 | Phase calibration structure of magnetic resonance radio frequency power amplifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110798155A (en) * | 2019-10-29 | 2020-02-14 | 电子科技大学 | Power amplifier AM-PM distortion correction circuit and method |
| CN112910492A (en) * | 2021-01-29 | 2021-06-04 | Oppo广东移动通信有限公司 | Radio frequency PA Mid device, radio frequency system and communication equipment |
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| CN201966305U (en) * | 2010-12-29 | 2011-09-07 | 成都亚光电子股份有限公司 | MCM four S-band digital phase shifter switch components |
| CN102386870A (en) * | 2011-11-16 | 2012-03-21 | 武汉滨湖电子有限责任公司 | Amplitude and phase control equipment and control method for power amplifier |
| CN202393905U (en) * | 2011-11-29 | 2012-08-22 | 南京鑫轩电子系统工程有限公司 | T/R (Transmission/Reception) assembly system |
| CN202617070U (en) * | 2012-05-17 | 2012-12-19 | 常州瑞思杰尔电子科技有限公司 | Dual-output phase-shifting all-solid-state radio frequency power supply |
| CN204168243U (en) * | 2014-11-06 | 2015-02-18 | 昆山美博中芯投资管理企业（有限合伙） | High reliability is without the feed forward power amplifier of delay line |
| CN204349955U (en) * | 2014-12-26 | 2015-05-20 | 成都华光瑞芯微电子股份有限公司 | A kind of phase switcher chip |
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2015
- 2015-09-10 CN CN201510573601.6A patent/CN105207627A/en active Pending
Patent Citations (7)
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| US20040266368A1 (en) * | 2003-06-25 | 2004-12-30 | Nokia Corporation | Power control for a transmitter |
| CN201966305U (en) * | 2010-12-29 | 2011-09-07 | 成都亚光电子股份有限公司 | MCM four S-band digital phase shifter switch components |
| CN102386870A (en) * | 2011-11-16 | 2012-03-21 | 武汉滨湖电子有限责任公司 | Amplitude and phase control equipment and control method for power amplifier |
| CN202393905U (en) * | 2011-11-29 | 2012-08-22 | 南京鑫轩电子系统工程有限公司 | T/R (Transmission/Reception) assembly system |
| CN202617070U (en) * | 2012-05-17 | 2012-12-19 | 常州瑞思杰尔电子科技有限公司 | Dual-output phase-shifting all-solid-state radio frequency power supply |
| CN204168243U (en) * | 2014-11-06 | 2015-02-18 | 昆山美博中芯投资管理企业（有限合伙） | High reliability is without the feed forward power amplifier of delay line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110798155A (en) * | 2019-10-29 | 2020-02-14 | 电子科技大学 | Power amplifier AM-PM distortion correction circuit and method |
| CN112910492A (en) * | 2021-01-29 | 2021-06-04 | Oppo广东移动通信有限公司 | Radio frequency PA Mid device, radio frequency system and communication equipment |
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Application publication date: 20151230 |
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