CN103546100A - Big Dipper/GPS double-system low-noise amplifier - Google Patents
Big Dipper/GPS double-system low-noise amplifier Download PDFInfo
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- CN103546100A CN103546100A CN201210238791.2A CN201210238791A CN103546100A CN 103546100 A CN103546100 A CN 103546100A CN 201210238791 A CN201210238791 A CN 201210238791A CN 103546100 A CN103546100 A CN 103546100A
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Abstract
A Big Dipper/GPS double-system low-noise amplifier comprises an ultra wide band low-noise amplifying circuit and a double-passband band-pass balance filter circuit which are arranged in a same receiving system. The ultra wide band low-noise amplifying circuit simultaneously carries out low-noise amplification on Big Dipper/GPS satellite signals. The double-passband band-pass balance filter circuit restrains interference signals outside Big Dipper/GPS satellite signal frequency bands. The Big Dipper/GPS satellite signals through the low-noise amplification and filter enter a double-frequency-band gain continuous adjustment circuit, the gain of the amplifier can be continuously changed through the double-frequency-band gain continuous adjustment circuit, and it is guaranteed that the power level of Big Dipper signals and the power level of GPS signals meet the requirements of a receiver. The Big Dipper/GPS satellite signals passing through the double-frequency-band gain continuous adjustment circuit enter a frequency band gain proportion adjustment circuit, and the gain slope of a GPS frequency band and the gain slope of a Big Dipper frequency band are respectively adjusted in the frequency band gain proportion adjustment circuit. The Big Dipper/GPS satellite signals passing through the frequency band gain proportion adjustment circuit enter a wide frequency band driving and amplifying circuit to be driven and amplified.
Description
Technical field
The present invention relates to a kind of low noise amplifier, be particularly useful for the low noise amplifier of compatible with GPS and Big Dipper generation satellite-signal.
Background technology
The mode of operation of the active and standby combination of the Big Dipper/GPS is conventional application model in current China's satellite navigation field.Because the Big Dipper and gps satellite navigation system are all to transmit via satellite, the signal that arrives the earth relatively a little less than, simultaneously due to the difference of satellite elevation angle and be subject to blocking of trees, building etc., the signal strength signal intensity that arrives ground can be lower.This has brought certain difficulty for the application of satellite navigation system.
Existing low noise amplifier has single Beidou low-noise amplifier in the market, and the low noise amplifier of single port input, single port output does not also appear that a kind of compatible Big Dipper simultaneously and gps satellite signal amplify, in single GPS low noise amplifier.
Summary of the invention
Can not shared low noise amplifier in order to solve the Big Dipper/GPS dual system receiver, long feeder line receives the problem that can not share a feeder line, the invention provides and a kind of Big Dipper LNA and GPS LNA are united two into one, single port input, the Big Dipper/GPS dual system low noise amplifier of single port output.
For achieving the above object, the present invention is by the following technical solutions:
A kind of Big Dipper/GPS dual system low noise amplifier, it comprises superwide band low noise amplifying circuit and the logical balance filter circuit of bilateral band band being arranged in same receiving system, wherein, described superwide band low noise amplifying circuit carries out low noise amplification to the Big Dipper/gps satellite signal simultaneously; The logical balance filter circuit of described bilateral band band suppresses the interference signal outside the Big Dipper/gps satellite signal frequency range; Through the Big Dipper/gps satellite signal of low noise amplification and filtering, enter the double frequency-band continuous regulating circuit that gains, by the double frequency-band continuous conditioned circuit that gains, make the gain continuous variable of amplifier, guarantee that the power level of Big Dipper signal and gps signal meets the requirement of receiver; Through the gain Big Dipper/gps satellite signal of continuous regulating circuit of double frequency-band, enter band gain ratio regulating circuit, in band gain ratio regulating circuit, regulate respectively the gain slope of GPS frequency range and Big Dipper frequency range, guarantee that Big Dipper band gain and GPS band gain are proper ratio, meet the requirement of various feeder lines to the Big Dipper and GPS frequency range differential declines value; Through the Big Dipper/gps satellite signal of band gain ratio regulating circuit, enter broadband drive amplification circuit and carry out drive amplification, the Big Dipper/gps satellite signal power level of guaranteeing to arrive receiver reaches the requirement of receiver receiving sensitivity.
Above-mentioned superwide band low noise amplifying circuit consists of first order superwide band low noise amplifying circuit and second level superwide band low noise amplifying circuit; The logical balance filter circuit of described bilateral band band consists of the logical balance filter circuit of first order bilateral band band and the logical balance filter circuit of second level bilateral band band; Wherein, first order superwide band low noise amplifying circuit connects the logical balance filter circuit of first order bilateral band band, the logical balance filter circuit of first order bilateral band band connects second level superwide band low noise amplifying circuit, and second level superwide band low noise amplifying circuit connects the logical balance filter circuit of second level bilateral band band.
In first order superwide band low noise amplifying circuit, noise factor is for being less than 2dB.
In the logical balance filter circuit of first order bilateral band band and the logical balance filter circuit of second level bilateral band band, by high frequency capacitance, high-frequency inductor and resistance form the logical balance filter network of bilateral band band, and the logical balance filter network of above-mentioned bilateral band band is also connected with the impedance network being formed by resistance.
The above-mentioned double frequency-band continuous regulating circuit that gains is comprised of three Schottky diodes, high frequency capacitance, micro-band inductance and resistance, by controlling the On current of three Schottky diodes, realize the continuous adjusting of Schottky diode equivalent resistance, thereby realize the continuous adjusting of two-band gain.
Above-mentioned band gain ratio regulating circuit is follow-on T-shaped amplitude equalizer, adds that T-shaped impedance attenuation network is realized Big Dipper frequency range and GPS band gain ratio regulates by the combination of trap circuit and filtering filter circuit, meets feeder attenuation requirement.
Adopt the present invention of technique scheme, intermediate member as antenna and receiver, by a feeder line, realization is carried out low noise amplification to Big Dipper generation satellite-signal and gps satellite signal simultaneously, the satellite-signal that assurance reaches receiver has lower noise, higher system gain, for long feeder line ground application system provides good satellite-signal.The present invention not only can single port input and output realize the low noise amplification to Big Dipper satellite signal and gps satellite signal, and broken away from the dependence to single navigation system, realize the mutual supplement with each other's advantages of Beidou satellite navigation system and gps satellite navigation system, improved the stability of satellite navigation system.Specifically, the present invention has the following advantages:
1. Big Dipper amplifying circuit and GPS amplifying circuit are combined in to same signal path, can to Big Dipper satellite signal and gps satellite signal, realize low noise amplification simultaneously;
2. the satellite-signal beyond pair Big Dipper and GPS well suppresses;
3. the gain of amplifier can be adjustable continuously in the Big Dipper and GPS frequency range;
4. the signal of Big Dipper frequency range and GPS frequency range carries out amplitude equalization adjustment, guarantees the ratio of gain and the Big Dipper gain of GPS;
5. volume is little, and single GPS or Big Dipper amplifier volume suitable;
6. low in energy consumption, suitable with single GPS LNA power consumption.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present invention.
Fig. 2 is the logical balance filter circuit figure of bilateral band band of the present invention.
Fig. 3 is the double frequency-band of the present invention continuous regulating circuit figure that gains.
Fig. 4 is band gain ratio regulating circuit figure of the present invention.
Embodiment
As shown in Figure 1, the Big Dipper/GPS dual system low noise amplifier is the low noise amplifier of compatible two kinds of satellite navigation systems, adopt the integrated design of Big Dipper LNA and GPS LNA, mainly comprise following part: be arranged on superwide band low noise amplifying circuit and the logical balance filter circuit of bilateral band band in same receiving system, the double frequency-band continuous regulating circuit that gains, band gain ratio regulating circuit, broadband drive amplification circuit, two-band impedance matching circuit and port feedback power supply circuits.
Wherein, superwide band low noise amplifying circuit carries out low noise amplification to the Big Dipper/gps satellite signal simultaneously; The logical balance filter circuit of bilateral band band suppresses the interference signal outside the Big Dipper/gps satellite signal frequency range, prevents that frequency band is with the interference of external signal.
It should be noted that, above-mentioned superwide band low noise amplifying circuit consists of first order superwide band low noise amplifying circuit and second level superwide band low noise amplifying circuit; The logical balance filter circuit of bilateral band band consists of the logical balance filter circuit of first order bilateral band band and the logical balance filter circuit of second level bilateral band band, in the logical balance filter circuit of first order bilateral band band and the logical balance filter circuit of second level bilateral band band, by high frequency capacitance, high-frequency inductor and resistance form the logical balance filter network of bilateral band band.Wherein, first order superwide band low noise amplifying circuit connects the logical balance filter circuit of first order bilateral band band, the logical balance filter circuit of first order bilateral band band connects second level superwide band low noise amplifying circuit, and second level superwide band low noise amplifying circuit connects the logical balance filter circuit of second level bilateral band band.
The super broad passband low noise amplifier circuit of the first order is as the first order in low noise amplifier circuit, and its major function is that the low voltage signal from antenna is carried out to small-signal amplification.The noise factor of first order amplifier is maximum to the noise effect of whole microwave system, the gain of first order amplifier is by the noise suppressed degree determining late-class circuit, and its linearity will produce material impact to the linearity of whole system and common mode noise rejection ratio.Basic demand to low noise amplifier at the corresponding levels is: low, the enough power gain of noise factor, good operating stability, enough bandwidth and large dynamic range.For the first order LNA in this amplifier, owing to being applied in Big Dipper frequency range and GPS frequency range simultaneously, its bandwidth of operation has reached 1GHz, in order well to realize input impedance coupling in useful band, to carry out equilibrium to input noise and input reflection loss, accomplish that two kinds of couplings approach as far as possible.In order to realize output impedance coupling, require amplifier to have maximum power output.Require this amplifier absolute stability within the scope of working frequency range simultaneously.In order to improve the stability of low noise amplifier, we adopt the degenerative mode of serial connection impedance to guarantee the stability of LNA conventionally.
The Big Dipper/gps satellite signal after first order superwide band low noise amplifies enters the logical balance filter circuit of first order bilateral band band, and the interference signal outside a Big Dipper generation and GPS frequency range is suppressed.As shown in Figure 2, the logical balance filtered electrical routing capacitance of bilateral band band and high-frequency inductor form the logical balance filter network of bilateral band band, compare with the filter of other types, and this filter has and has more more precipitous passband, stopband transient characteristic.The logical balance filter network of above-mentioned bilateral band band is also connected with the impedance network being formed by resistance, carrys out thus the decay of the balanced Big Dipper and GPS frequency range.When the Big Dipper receiving and gps satellite signal are by after this filter network, the Big Dipper and GPS frequency range have obtained good inhibition with the amplitude of external signal, thereby the carrier-to-noise ratio of signal is improved.
The noise of the second low superwide band low noise amplifying circuit is quite less on the impact of whole system noise, therefore concerning the low noise amplifier of the second level, the noise of amplifier has seemed and has not been so important, and aobvious even more important of the 1dB compression point of amplifier and the index of third order intermodulation point, bandwidth and the stability of amplifier will be got well simultaneously.
Then the Big Dipper/gps satellite signal enters the logical balance filter circuit of second level bilateral band band, and the interference signal outside a Big Dipper generation and GPS frequency range is suppressed again, then enters the double frequency-band continuous regulating circuit that gains.
As shown in Figure 3, the double frequency-band continuous regulating circuit that gains, by the double frequency-band continuous conditioned circuit that gains, makes the gain continuous variable of amplifier, guarantees that the power level of Big Dipper signal and gps signal meets the requirement of receiver.The double frequency-band continuous regulating circuit that gains is comprised of three Schottky diodes, high frequency capacitance, micro-band inductance and resistance, by controlling the On current of three Schottky diodes, realize the continuous adjusting of Schottky diode equivalent resistance, thereby realize the continuous adjusting of two-band gain.By this adjustable damping networking, can within the scope of 13dB, regulate continuously the gain of whole circuit.This gain conditioned circuit is to utilize Schottky diode under DC bias voltage, when higher than its cut-off frequency fc, it can be used as the variable-resistance principle of Flow Control, is regulated and is added in the electric current on Schottky diode continuously, thereby regulate the decay of whole circuit by adjustable resistor.
As shown in Figure 4, in band gain ratio regulating circuit, regulate respectively the gain slope of GPS frequency range and Big Dipper frequency range, guarantee that Big Dipper band gain and GPS band gain are proper ratio, meet the requirement of various feeder lines to the Big Dipper and GPS frequency range differential declines value.Because wideband low noise amplifier exists gain slope problem, aspect broadband connections, the subject matter of the low noise amplifier of application is the rising along with frequency at present, and gain can reduce gradually.In order to obtain quite consistent gain in broadband amplifying circuit, we utilize lumped-circuit that amplitude equalizer is provided.Band gain ratio regulating circuit is follow-on T-shaped amplitude equalizer, adds that T-shaped impedance attenuation network is realized Big Dipper frequency range and GPS band gain ratio regulates by the combination of trap circuit and filtering filter circuit, meets feeder attenuation requirement.Resonance frequency is set on required frequency, can makes the gain-slope of circuit be greater than zero, thus the negative gain slope of the standard of counteracting broadband amplifiers.This circuit will consider to reduce parasitic antenna, the impact that pad capacitance and imperfect element characteristic bring when design.
Through the Big Dipper/gps satellite signal of band gain ratio regulating circuit, enter broadband drive amplification circuit and carry out drive amplification, the Big Dipper/gps satellite signal power level of guaranteeing to arrive receiver reaches the requirement of receiver receiving sensitivity.Broadband drive amplification circuit is negligible to the noise effect of whole system, therefore in the selection of driving amplifier, can ignore this technical indicator of noise, the input of amplifier, the design of output matching is all to input with maximum, the conjugate impedance match of power output, for driving amplifier, dynamic range is to weigh the main index of driving amplifier.Guarantee that amplifier, in the situation that small-signal is inputted, exports the useful signal of enough power levels, thereby drive receiver module below.
Two-band impedance matching circuit: because this amplifier only has a signal path, all devices in this circuit all need to realize two-band coupling, guarantee the input and output standing wave of the Big Dipper and GPS frequency range.In this circuit, adopt two-band matching method, well solved Circuit Matching problem.
Port feedback power supply circuits: in this circuit, feed circuit and power supply circuits are combined, without other feed, the DC power supply that just can receiver be provided by feeder line offers antenna, drives this amplifier simultaneously.
Under framework of the present invention as shown in Figure 1, the record principle of its signal path is: the big-dipper satellite and the gps satellite signal that arrive the Big Dipper/GPS dual system low noise amplifier, by the first order, surpass broad passband low noise amplifier circuit the satellite-signal of Big Dipper frequency range and GPS frequency range is carried out to low noise amplification, by the logical balance filter circuit of first order bilateral band band, carry out the filtering of dual band pass balance, then enter the super broad passband low noise amplifier circuit in the second level Big Dipper and gps satellite signal are carried out to low noise amplification, by the logical balance filter circuit of the second level Big Dipper/GPS bilateral band band, carry out the filtering of dual band pass balance, then enter double frequency-band gain continuous regulating circuit and band gain ratio regulating circuit, finally enter broadband drive amplification circuit the Big Dipper and gps satellite signal are carried out to drive amplification.Therefore, the present invention is not only applicable to the Big Dipper generation receiver of the Big Dipper generation satellite navigation system based on China's independent intellectual property right, also be applicable to the GPS receiver based on GPS of America GPS (Global Position System), be also applicable to the Big Dipper/GPS receiver of double reception system.
Design parameter of the present invention is as follows:
GPS frequency range: the gps satellite signal that amplification frequency scope is 1575.42 ± 5MHz.
Big Dipper frequency range: the Big Dipper generation satellite-signal that amplification frequency scope is 2491.75 ± 4.08MHz.
The index of this LNA is as follows:
Operating frequency: 2491.75 ± 4.08MHz, 1575.42 ± 5MHZ
Noise :≤2dB≤2dB
Input vswr: VSWR≤2:1 VSWR≤2:1
Output VSWR: VSWR≤2:1 VSWR≤2:1
Gain (adjustable continuously): 32～45dB, 25～38dB
50 ohm of characteristic impedances
Operating voltage: 4.5 ∽ 5.5V
Operating current :≤28mA
85 ℃ of working temperature-40 ℃ ∽
85 ℃ of storage temperature-40 ℃ ∽
Gain slope adjusting range: 0～13dB
Burn power 1W.
Claims (6)
1. the Big Dipper/GPS dual system low noise amplifier, it is characterized in that: it comprises superwide band low noise amplifying circuit and the logical balance filter circuit of bilateral band band being arranged in same receiving system, wherein, described superwide band low noise amplifying circuit carries out low noise amplification to the Big Dipper/gps satellite signal simultaneously; The logical balance filter circuit of described bilateral band band suppresses the interference signal outside the Big Dipper/gps satellite signal frequency range;
Through the Big Dipper/gps satellite signal of low noise amplification and filtering, enter the double frequency-band continuous regulating circuit that gains, by the double frequency-band continuous conditioned circuit that gains, make the gain continuous variable of amplifier, guarantee that the power level of Big Dipper signal and gps signal meets the requirement of receiver;
Through the gain Big Dipper/gps satellite signal of continuous regulating circuit of double frequency-band, enter band gain ratio regulating circuit, in band gain ratio regulating circuit, regulate respectively the gain slope of GPS frequency range and Big Dipper frequency range, guarantee that Big Dipper band gain and GPS band gain are proper ratio, meet the requirement of various feeder lines to the Big Dipper and GPS frequency range differential declines value;
Through the Big Dipper/gps satellite signal of band gain ratio regulating circuit, enter broadband drive amplification circuit and carry out drive amplification, the Big Dipper/gps satellite signal power level of guaranteeing to arrive receiver reaches the requirement of receiver receiving sensitivity.
2. the Big Dipper/GPS dual system low noise amplifier according to claim 1, is characterized in that: described superwide band low noise amplifying circuit consists of first order superwide band low noise amplifying circuit and second level superwide band low noise amplifying circuit; The logical balance filter circuit of described bilateral band band consists of the logical balance filter circuit of first order bilateral band band and the logical balance filter circuit of second level bilateral band band; Wherein, first order superwide band low noise amplifying circuit connects the logical balance filter circuit of first order bilateral band band, the logical balance filter circuit of first order bilateral band band connects second level superwide band low noise amplifying circuit, and second level superwide band low noise amplifying circuit connects the logical balance filter circuit of second level bilateral band band.
3. the Big Dipper/GPS dual system low noise amplifier according to claim 2, is characterized in that: in first order superwide band low noise amplifying circuit, noise factor is for being less than 2dB.
4. the Big Dipper/GPS dual system low noise amplifier according to claim 2, it is characterized in that: in the logical balance filter circuit of first order bilateral band band and the logical balance filter circuit of second level bilateral band band, by high frequency capacitance, high-frequency inductor and resistance form the logical balance filter network of bilateral band band, and the logical balance filter network of above-mentioned bilateral band band is also connected with the impedance network being formed by resistance.
5. the Big Dipper/GPS dual system low noise amplifier according to claim 1, it is characterized in that: the described double frequency-band continuous regulating circuit that gains is comprised of three Schottky diodes, high frequency capacitance, micro-band inductance and resistance, by controlling the On current of three Schottky diodes, realize the continuous adjusting of Schottky diode equivalent resistance, thereby realize the continuous adjusting of two-band gain.
6. the Big Dipper/GPS dual system low noise amplifier according to claim 1, it is characterized in that: described band gain ratio regulating circuit is follow-on T-shaped amplitude equalizer, by the combination of trap circuit and filtering filter circuit, add that T-shaped impedance attenuation network is realized Big Dipper frequency range and GPS band gain ratio regulates.
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| CN108092632A (en) * | 2017-12-15 | 2018-05-29 | 安徽华东光电技术研究所 | A kind of manufacture craft of 3 watts of power amplifiers of X-band |
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| CN104617972A (en) * | 2014-12-30 | 2015-05-13 | 宇龙计算机通信科技(深圳)有限公司 | Method and device for transmitting signal, and terminal |
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| CN109547923A (en) * | 2018-11-19 | 2019-03-29 | 海能达通信股份有限公司 | A kind of method, communication terminal and the storage medium of positioning signal processing |
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