CN101216526B - Feedforward loop circuit synchronous detection device - Google Patents
Feedforward loop circuit synchronous detection device Download PDFInfo
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- CN101216526B CN101216526B CN2007101441302A CN200710144130A CN101216526B CN 101216526 B CN101216526 B CN 101216526B CN 2007101441302 A CN2007101441302 A CN 2007101441302A CN 200710144130 A CN200710144130 A CN 200710144130A CN 101216526 B CN101216526 B CN 101216526B
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Abstract
The invention belongs to the field of electronic and wireless communication technology and relates to a feed-forward loop synchronous detection circuit, which is characterized in that the device comprises a phase noise signal source, a feed-forward loop to be measured and a measurement and analytic calculation circuit; the phase noise signal source is outputted by two circuits through a phase modulator; the feed-forward loop to be measured outputs the phase noise signal to the input terminal of a power divider of the feed-forward loop; the power divider divides the phase noise signal into two portions, which are respectively amplified and delayed and converged at a counteraction position; and the two signal portions are transmitted to the measurement and analytic calculation circuit portion to measurement and analytic processing. The invention has the advantages of simple structure, high efficiency, lowered measurement cost and production cost, simple operation and high efficiency, and is suitable for batch production and debugging of feed-forward amplifier.
Description
Technical field
The invention belongs to electronics and wireless communication technology field, particularly a kind of feedforward loop circuit sync detection circuit.
Background technology
Modern wireless communication improves the availability of frequency spectrum of channel and the direction fast development that improves the linearity day by day towards increasing information capacity.This just has higher requirement to frequency span, the linearity and the efficient of high frequency power amplifier.General linearization technique commonly used comprises: back-off, predistortion, feedforward etc., wherein, feed-forward technique is because it has high calibration accuracy, high stability and be not subjected to advantages such as bandwidth constraints becomes the major technique that is adopted when improving the broadband signal linearity.
Feed-forward technique is from extracting intermodulation distortion signals through the amplified output signal, its anti-phase amplification back is mixed with output signal again, thereby reach the counteracting distorted signal, improving linear purpose.
Referring to Fig. 1, this amplifier is made up of loop 1 and loop 2, when passing through high power amplifier (main power amplifier), two-tone signal produces distortion, offset through distorted signal after the coupling mechanism coupling and the input signal that passes through after the first time-delay time-delay, in first loop, distorted signal is separated, and then in second ring, realized distortion cancellation.Offsetting, from the mathematics angle, is the signal subtraction in two same frequencies, equal amplitudes, and consequently amplitude is zero or is-∞ dBm.But the process of offsetting in the practical application obtains by the signal vector addition, and promptly the amplitude of signal equates but phase place is opposite, offset in broadband range, and be that the vector in frequency band is offset, its signal must satisfy: 1, the amplitude of Xiang Denging; 2,180 degree phase differential; 3, the delay of Xiang Denging.
Summary, the core of feed-forward technique---signal cancellation must satisfy above three conditions, that is: the A among Fig. 1 to B and C to D and E to F and G to H, must guarantee respectively that identical gain, identical delay and 180 spend phase differential.When the debugging Feed Forward Power Amplifier, satisfy above three conditions that guarantee, classic method is to need expensive high precision vector network analyzer, respectively 3 indexs (amplitude, phase place, delay) of its 4 paths are measured, after Feed Forward Power Amplifier is adjusted in debugging, also need measure respectively again, equate to guarantee path.This method exists:
1, measures the cost height;
2, trivial operations;
3, inefficiency;
4, can not calculate the path departure automatically;
Debugging when 5, being not suitable for producing in enormous quantities.
Therefore, be necessary to invent one of design and be suitable for the synchronous automatic detection device of feed-forward amplifier loop.
Summary of the invention
Fundamental purpose of the present invention is to solve defectives such as existing complexity, testing cost height in the existing method of testing, a kind of simple and effective method of testing with low cost is provided, not only can test the whether synchronous of Feed Forward Power Amplifier cyclic system, and can calculate the amplitude shift amount Δ A and the phase-shift phase Δ φ of feedforward loop circuit two paths automatically, make that debugging Feed Forward Power Amplifier loop is effectively simple synchronously, reduce debugging difficulty, testing cost is cheap, and debugging is used when being fit to produce in enormous quantities.
The present invention realizes by following process: feedforward loop circuit synchronous detection device comprises phase noise cancellation signal source, feedforward loop circuit to be measured and Measurement and analysis counting circuit, sets forth respectively below:
Described phase noise cancellation signal source is exported through phase converter by the two-way circuit, one the tunnel for being connected with reference frequency oscillator in turn, phaselocked loop, loop filter, the circuit of voltage controlled oscillator, another road is for being connected with noise generator in turn, the circuit of band acceptor, described feedforward loop circuit to be measured exports described phase noise cancellation signal to the power splitter input end of described feedforward loop circuit to be measured, power splitter is divided into two-way with the phase noise cancellation signal, signal is amplified with the time-delay back respectively and converge at counteracting place two signals, this two paths of signals is inputed to Measurement and analysis counting circuit part, and described Measurement and analysis counting circuit comprises the numerical control phase converter, the numerical control amplitude modulator, power splitter, frequency mixer, quadrature phase shifter, amplifier, analog to digital conversion, single-chip microcomputer and display part.
Two paths of signals to be measured, one the tunnel behind quadrature phase shifter, the orthogonal signal that output two-way phase differential is 90 ° are delivered to respectively and are used for amplitude, the RF end of the frequency mixer of phase-detection, send into power splitter behind another road signal process numerical control phase converter and the numerical control amplitude modulator, be distributed into the signal of two equal amplitude and phase place, deliver to the LO end of frequency mixer, deliver to the orthogonal signal of frequency mixer with another road and carry out mixing, suppose because feedforward loop circuit asynchronous, then the IF of frequency mixer end produce respectively obtain one only with the associated arguments Δ A of signal amplitude deviation and one only with the associated arguments Δ φ of signal phase deviation, amplitude phase potential difference Δ A is with after phasic difference voltage Δ φ mutually amplifies through two two-forty broadband operational amplifiers again, become digital signal to deliver to single-chip microcomputer two voltage transitions by analog to digital converter and carry out judgment processing, single-chip microcomputer is by changing numerical control phase converter and numerical control amplitude modulator automatically, judge amplitude phase potential difference Δ A and phasic difference voltage Δ φ value mutually again, can calculate the amplitude of feedforward loop circuit two paths, phase place, the delay deviation amount, can calculate the resistance value size of synchronous required delay line length of correction path and amplitude fading thus, deliver to display device output again.
Be actually used in the production debugging and show that the present invention is simply effective, can reduce and measure cost and production cost, simple to operate, raise the efficiency, be convenient to Feed Forward Power Amplifier and produce in batches and debug.
Description of drawings
Fig. 1 is the feed-forward technique system construction drawing
Fig. 2 is a structural drawing of the present invention
Fig. 3 is the block diagram in phase noise cancellation signal source
Embodiment
The block diagram in phase noise cancellation signal source as shown in Figure 3, reference frequency vibration provides a reference frequency for phaselocked loop, for phase-locked loop provides a benchmark.The phaselocked loop effect is can make loop be in a steady state (SS) that oscillation frequency is adjustable under the reference frequency effect having, and can make sinusoidal signal of the stable output of voltage controlled oscillator, exports through phase converter modulation back; Noise generator produces a random-noise voltage, this voltage is injected into phase converter with noise voltage after by a band acceptor, by phase converter noise voltage is converted into phase noise, make the phase place of the sinusoidal signal that phaselocked loop produces variable at random, increase noise voltage and will increase phase noise.This method to the cycle of phase-locked loop filtering bandwidth without limits, in order to obtain shorter locking time, the loop filtering bandwidth is wide as far as possible, it is irrelevant with the voltage controlled oscillator gain that the another one advantage of this method is that phase noise distributes, and by phase gain (K
PHASE) decision, so one of the output of energy stable performance is made an uproar at random and very poor signal mutually.
Referring to Fig. 2, this signal exports the power splitter input end of feedforward loop circuit to be measured to, power splitter is divided into two-way with the phase noise cancellation signal, signal is amplified with the time-delay back respectively and converge at counteracting place two signals, this two paths of signals is inputed to the Measurement and analysis calculating section, measure and calculate the loop error amount by this part.
The Measurement and analysis calculating section comprises numerical control phase converter, numerical control amplitude modulator, power splitter, frequency mixer, quadrature phase shifter, amplifier, analog to digital conversion, single-chip microcomputer (MCU) and display part, below narration respectively.
Two paths of signals to be measured, the one tunnel behind quadrature phase shifter, and the orthogonal signal that output two-way phase differential is 90 ° are delivered to the RF end of the frequency mixer that is used for amplitude, phase-detection more respectively.Send into power splitter behind another road signal process numerical control phase converter and the numerical control amplitude modulator, be distributed into the signal of two equal amplitude and phase place, deliver to the LO end of frequency mixer, deliver to the orthogonal signal of frequency mixer with another road and carry out mixing, suppose because feedforward loop circuit asynchronous, then the IF of frequency mixer end produce respectively obtain one only with the associated arguments Δ A of signal amplitude deviation and one only with the associated arguments Δ φ of signal phase deviation.
Amplitude phase potential difference Δ A becomes digital signal to deliver to single-chip microcomputer (MCU) two voltage transitions by analog to digital converter and carries out judgment processing with after phasic difference voltage Δ φ mutually amplifies through two two-forty broadband operational amplifiers again.Single-chip microcomputer (MCU) is by changing numerical control phase converter and numerical control amplitude modulator automatically, judge amplitude phase potential difference Δ A and phasic difference voltage Δ φ value mutually again, can calculate amplitude, phase place, the delay deviation amount of feedforward loop circuit two paths, can calculate the resistance value size of synchronous required delay line length of correction path and amplitude fading thus, deliver to display device output again.
Claims (1)
1. feedforward loop circuit synchronous detection device, it is characterized in that: this device comprises phase noise cancellation signal source, feedforward loop circuit to be measured and Measurement and analysis counting circuit, described phase noise cancellation signal source is exported through phase converter by the two-way circuit, one the tunnel for being connected with reference frequency oscillator in turn, phaselocked loop, loop filter, the circuit of voltage controlled oscillator, another road is for being connected with noise generator in turn, the circuit of band acceptor, described feedforward loop circuit to be measured is transported to the phase noise cancellation signal of described phase noise cancellation signal source output the power splitter input end of described feedforward loop circuit to be measured, power splitter is divided into two-way with the phase noise cancellation signal, signal is amplified with the time-delay back respectively and converge at counteracting place two signals, two paths of signals after this is converged inputs to Measurement and analysis counting circuit part, and described Measurement and analysis counting circuit comprises the numerical control phase converter, the numerical control amplitude modulator, power splitter, frequency mixer, quadrature phase shifter, amplifier, analog to digital conversion, single-chip microcomputer and display part; Two paths of signals to be measured in the described Measurement and analysis counting circuit, the first via is behind quadrature phase shifter, the orthogonal signal that output two-way phase differential is 90 ° are delivered to respectively and are used for amplitude, the radio-frequency head of the frequency mixer of phase-detection, send into power splitter behind the second road signal process numerical control phase converter and the numerical control amplitude modulator, be distributed into the signal of two equal amplitude and phase place, deliver to the local oscillator end of frequency mixer, deliver to the orthogonal signal of frequency mixer with the first via and carry out mixing, suppose because feedforward loop circuit asynchronous, then the intermediate frequency end of frequency mixer produce respectively obtain one only with the associated arguments Δ A of signal amplitude deviation and one only with the associated arguments Δ φ of signal phase deviation, amplitude phase potential difference Δ A is with after phasic difference voltage Δ φ mutually amplifies through two two-forty broadband operational amplifiers again, become digital signal to deliver to single-chip microcomputer two voltage transitions by analog to digital converter and carry out judgment processing, single-chip microcomputer is by changing numerical control phase converter and numerical control amplitude modulator automatically, judge amplitude phase potential difference Δ A and phasic difference voltage Δ φ value mutually again, can calculate the amplitude of feedforward loop circuit two paths, phase place, the delay deviation amount, can calculate the resistance value size of synchronous required delay line length of correction path and amplitude fading thus, deliver to display device output again.
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| CN2007101441302A CN101216526B (en) | 2007-12-29 | 2007-12-29 | Feedforward loop circuit synchronous detection device |
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| CN2007101441302A CN101216526B (en) | 2007-12-29 | 2007-12-29 | Feedforward loop circuit synchronous detection device |
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| CN101216526B true CN101216526B (en) | 2010-06-16 |
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| CN101826880A (en) * | 2010-03-23 | 2010-09-08 | 成都九洲迪飞科技有限责任公司 | Signal source module of air traffic alert and collision avoidance system receiver |
| CN103454542B (en) * | 2013-09-11 | 2016-04-27 | 中国电子科技集团公司第四十一研究所 | Antenna and transmission line tester and real-time automatic calibrating method |
| CN103634002A (en) * | 2013-12-23 | 2014-03-12 | 北京无线电计量测试研究所 | Real-time calibration system and method for broadband VCO (Voltage Controlled Oscillator) linearity |
| CN115361072B (en) * | 2022-10-21 | 2023-05-02 | 杭州紫光通信技术股份有限公司 | Isolator testing method, isolator testing device, isolator testing apparatus, storage medium and electronic device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5994957A (en) * | 1997-12-19 | 1999-11-30 | Lucent Technologies Inc. | Feed forward amplifier improvement |
| CN1282461A (en) * | 1997-12-17 | 2001-01-31 | 摩托罗拉公司 | Feedforward amplifier network with frequency swept pilot tone for reducing power amplifier produced distortion |
| CN1518374A (en) * | 2003-01-17 | 2004-08-04 | 深圳市中兴通讯股份有限公司 | Method and equipment for implementing digital loop control of feed-forward power amplifier |
| CN101051818A (en) * | 2007-01-30 | 2007-10-10 | 深圳国人通信有限公司 | Intelligent control system and method for carrier cancellation in feedforward linear power amplifier |
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2007
- 2007-12-29 CN CN2007101441302A patent/CN101216526B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1282461A (en) * | 1997-12-17 | 2001-01-31 | 摩托罗拉公司 | Feedforward amplifier network with frequency swept pilot tone for reducing power amplifier produced distortion |
| US5994957A (en) * | 1997-12-19 | 1999-11-30 | Lucent Technologies Inc. | Feed forward amplifier improvement |
| CN1518374A (en) * | 2003-01-17 | 2004-08-04 | 深圳市中兴通讯股份有限公司 | Method and equipment for implementing digital loop control of feed-forward power amplifier |
| CN101051818A (en) * | 2007-01-30 | 2007-10-10 | 深圳国人通信有限公司 | Intelligent control system and method for carrier cancellation in feedforward linear power amplifier |
Non-Patent Citations (2)
| Title |
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| 毛孟达等.基于导频检测技术的射频前馈功放研究.元器件与应用 22.2005,(22),62-64. |
| 毛孟达等.基于导频检测技术的射频前馈功放研究.元器件与应用 22.2005,(22),62-64. * |
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