CN104467692A - Input-matching standing-wave ratio adjusting circuit for low-noise amplifier - Google Patents
Input-matching standing-wave ratio adjusting circuit for low-noise amplifier Download PDFInfo
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- CN104467692A CN104467692A CN201410770950.2A CN201410770950A CN104467692A CN 104467692 A CN104467692 A CN 104467692A CN 201410770950 A CN201410770950 A CN 201410770950A CN 104467692 A CN104467692 A CN 104467692A
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Abstract
The invention relates to an input-matching standing-wave ratio adjusting circuit for a low-noise amplifier and provides a circuit allowing the standing-wave ratio of the low-noise amplifier to be effectively adjusted. The input-matching standing-wave ratio adjusting circuit comprises two variable capacitance diodes; anodes of the variable capacitance diodes are grounded, and cathodes of the variable capacitance diode are connected with ground pins of the low-noise amplifier; reverse bias voltage is input to the reverse ends of the variable capacitance diodes; junction capacitances of the variable capacitance diodes change with adjustment of the reverse bias voltage; thus, characteristic impedance of the input end of the low-noise amplifier is changed, and the standing-wave ratio is adjusted. The input-matching standing-wave ratio adjusting circuit is applicable to the adjustment of the standing-wave ratio in GSM (global system for mobile communications), CDMA (code division multiple access), GPS (global positioning system) and ISM (industrial scientific medical) bands.
Description
Technical field
The present invention relates to a kind of low noise amplifier input standing-wave ratio Circuit tuning, be particularly suitable in the debugging production of low noise amplifier input standing-wave ratio in Mobile communication direct base station, base station.
Background technology
Standing-wave ratio full name voltage standing wave ratio, English is VSWR (Voltage Standing WaveRatio), and in the place that incident wave is identical with reflected wave phase place, voltage amplitude adds up to maximum voltage amplitude Vmax, forms antinode; The local voltage amplitude contrary with reflected wave phase place at incident wave is kept to minimum voltage amplitude Vmin mutually, forms node.The amplitude of other each point is then between antinode and node.This composite wave is called moving standing wave.Standing-wave ratio is the voltage magnitude Vmax at standing wave antinode place and the ratio of the voltage magnitude Vmin at node place.
In radio system, antenna is connected with low noise amplifier by feeder line, turns back because impedance mismatch high-frequency energy will produce reflection, and disturbs converge generation standing wave with the part of advancing.In order to characterize and measure the stationary wave characteristic in antenna system, the namely situation of forward wave and reflected wave in antenna, this concept that people establish " standing-wave ratio ".Standing-wave ratio can use vector network analyzer to carry out test and obtain, and General Requirements standing-wave ratio is less than 1.5.
(1), the theoretical calculation formula of standing-wave ratio is:
VSWR＝R/r＝(1+|K|)/(1-|K|)
Reflection coefficient K=(R-r)/(R+r)
(when K is negative value, showing that phase place is contrary)
In formula, R and r is output impedance and input impedance respectively.When two impedance value are the same, namely reach and mate completely, reflection coefficient K equals 0, and standing-wave ratio is 1.This is a kind of desirable situation, in fact always there is reflection, so standing-wave ratio is always greater than 1.
(2), low noise amplifier has the index of input vswr, and from (one), reflection coefficient is determined by output impedance and input impedance, so just can change reflection coefficient by changing impedance thus adjust standing-wave ratio.
(3) use common high-frequency inductance capacitor to mate during the match circuit that low noise amplifier is traditional, due to supplied materials otherness, cause the situation that standing-wave ratio falls short of specifications.
Summary of the invention
For the problems referred to above, the invention provides a kind of by adjustment sending-end impedance, change reflection coefficient thus the low noise amplifier Input matching standing-wave ratio Circuit tuning of adjustment standing-wave ratio.
For achieving the above object, low noise amplifier Input matching standing-wave ratio Circuit tuning of the present invention, at least comprise low noise amplifier, the input match circuit be connected with described low noise amplifier input, the output match circuit be connected with described low noise amplifier output, wherein said input match circuit is by electric capacity (C1), 2 variable capacitance diode (D1, D2) and coupling capacitance (C12) and inductance (L1) composition, electric capacity (C1) is connected with the input pin of described amplifier, 2 variable capacitance diode (D1, D2) plus earth, negative electrode is connected with the grounding pin of described amplifier by electric capacity (C12) and resistance (R1), inductance (L1) is connected between electric capacity (C1) and electric capacity (C2),
To 2 variable capacitance diode (D1, D2) backward end input reverse bias voltages, by adjusting described reverse bias voltage, the junction capacitance of described variable capacitance diode also changes thereupon, and the amplifier in characteristic impedance described in realization changes, and standing-wave ratio is adjusted.
Further, also comprise single-chip microcomputer, D/A chip and in-phase proportion operational amplifier, D/A chip described in wherein said Single-chip Controlling exports analog voltage to described in-phase proportion operational amplifier, and described analog voltage is amplified the reverse bias voltage generated needed for described variable capacitance diode by described in-phase proportion operation method device.
Preferably, described in-phase proportion operational amplifier is chip LM258.
Beneficial effect:
Input match circuit matching capacitance is become variable capacitance diode by low noise amplifier Input matching standing-wave ratio Circuit tuning of the present invention, changes reverse bias voltage VR and realizes standing-wave ratio adjustment.Compared with prior art, the present invention uses variable capacitance diode to replace traditional coupling high frequency capacitance, its junction capacitance CV is changed by the reverse bias voltage VR changing variable capacitance diode both sides, thus change input characteristic impedance, and then reach the object of adjustment standing-wave ratio, this method, the situation that the high-frequency inductance capacitor low noise amplifier supplied materials otherness that can solve appearance in debugging production causes standing-wave ratio to fall short of specifications, save original method of being replaced inductance capacitance adjustment standing-wave ratio by welding, for scheduling and planning brings conveniently.
Accompanying drawing explanation
Fig. 1 is existing low noise amplifier MGA631P8 circuit theory diagrams;
Fig. 2 is embodiment of the present invention low noise amplifier MGA631P8 circuit theory diagrams;
Fig. 3 is embodiment of the present invention variable capacitance diode junction capacitance CV and reverse bias voltage VR graph of a relation;
Fig. 4 is embodiment of the present invention in-phase proportion operational amplifier LM258 schematic diagram;
Fig. 5 is embodiment of the present invention voltage VR control mode block diagram;
Fig. 6 is embodiment of the present invention standing-wave ratio debugging flow chart.
Embodiment
Below in conjunction with Figure of description, the present invention will be further described.
As shown in Figure 1, low noise amplifier MGA631P8 operating voltage is 4V, 54mA, and power acquisition+5V powers, and needs current-limiting resistance R3, R4, and C6, C7 are decoupling capacitor, and C5 is shunt capacitance.Input match circuit is made up of electric capacity C1, C8, inductance L 1, by adjusting the value control input end circuit characteristic impedance of capacitor and inductor.Output match circuit is electric capacity C2, inductance L 2 forms, and resistance R2, electric capacity C3 form feedback, reaches suitable gain by the gain of the resistance value adjustment low noise amplifier adjusting R2.
Low noise amplifier Input matching standing-wave ratio Circuit tuning of the present invention, comprises low noise amplifier, input match circuit, output match circuit, in-phase proportion operational amplifier, D/A chip, single-chip microcomputer.Wherein the matching capacitance in input match circuit is revised as variable capacitance diode, then by changing variable capacitance diode reverse bias voltage VR, the junction capacitance CV of the variable capacitance diode made changes, thus the characteristic impedance of input match circuit obtains change and standing-wave ratio adjustment, wherein VR is generated by in-phase proportion operation amplifier circuit.Low noise amplifier frequency of utilization, in 400MHz to 1500MHz frequency range, can be applicable in GSM, CDMA, GPS, ISM band, and it is described as follows at GSM frequency range application circuit
As shown in Figure 2, the present embodiment low noise amplifier Input matching standing-wave ratio Circuit tuning, low noise amplifier MGA631P8 operating voltage is 4V, 54mA, and power acquisition+5V powers, and needs current-limiting resistance R3, R4, and C6, C7 are decoupling capacitor, and C5 is shunt capacitance.Described input match circuit is by electric capacity C1, form with coupling capacitance C12 and inductance L 1, electric capacity C1 is connected with the input pin of described amplifier, the plus earth of 2 variable capacitance diodes D1, D2, negative electrode is connected with the grounding pin of described amplifier by electric capacity C12 and resistance R1, inductance L 1 is connected between electric capacity C1 and electric capacity C2, and wherein electric capacity C12 has stopping direct current to lead to the effect of interchange simultaneously.Output match circuit is electric capacity C2, inductance L 2 forms, and resistance R2, electric capacity C3 form feedback, reaches suitable gain by the gain of the resistance value adjustment low noise amplifier adjusting R2.
To 2 variable capacitance diode (D1, D2) backward end input reverse bias voltages, by adjusting described reverse bias voltage, the junction capacitance of described variable capacitance diode also changes thereupon, and the amplifier in characteristic impedance described in realization changes, and standing-wave ratio is adjusted.In the present embodiment, 2 variable capacitance diodes D1, D2 are also chip 1SV285.The junction capacitance CV of its chips 1SV285 and the relation of reverse bias voltage VR are as shown in Figure 3.
Described low noise amplifier Input matching standing-wave ratio Circuit tuning, also comprise single-chip microcomputer, D/A chip and in-phase proportion operational amplifier, D/A chip described in wherein said Single-chip Controlling exports analog voltage to described in-phase proportion operational amplifier, and described analog voltage is amplified the reverse bias voltage generated needed for described variable capacitance diode by described in-phase proportion operation method device.
As shown in Figure 4, in-phase proportion operation amplifier circuit figure, resistance R9, electric capacity C10 form input RC filter circuit, and resistance R5, R6 control ratio amplification coefficient, this circuit multiplication factor is Au=1+R5/R6=2.Resistance R8, electric capacity C4 form output RC low pass filter, and resistance R7 is that current-limiting resistance connects variable capacitance diode reverse bias voltage VR.This circuit function is voltage VR by the output voltage VSWR_Set scale amplifying of D/A chip.
As shown in Figure 5, PC holds software by control D/A chip output voltage VSWR_Set.
As shown in Figure 6, actual standing wave adjustment process, low noise module input port access vector network analyzer to be debugged, PC holds software by single-chip microcomputer C8051F410 control D/A chip AD5308 output voltage VSWR_Set, VSWR_Set is enlarged into VR by in-phase proportion operational amplifier, the change of VR causes the junction capacitance CV of variable capacitance diode also to change thereupon, and input characteristic impedance changes, and standing-wave ratio improves.
The present invention be should be understood that; above-described embodiment; further detailed description has been carried out to object of the present invention, technical scheme and beneficial effect; these are only embodiments of the invention; be not intended to limit the present invention, every within spiritual principles of the present invention, done any amendment, equivalent replacement, improvement etc.; all should be included within protection scope of the present invention, the protection range that protection scope of the present invention should define with claim is as the criterion.
Claims (3)
1. a low noise amplifier Input matching standing-wave ratio Circuit tuning, it is characterized in that: at least comprise low noise amplifier, the input match circuit be connected with described low noise amplifier input, the output match circuit be connected with described low noise amplifier output, wherein said input match circuit is by electric capacity (C1), 2 variable capacitance diode (D1, D2) and coupling capacitance (C12) and inductance (L1) composition, electric capacity (C1) is connected with the input pin of described amplifier, 2 variable capacitance diode (D1, D2) plus earth, negative electrode is connected with the grounding pin of described amplifier by electric capacity (C12) and resistance (R1), inductance (L1) is connected between electric capacity (C1) and electric capacity (C2),
To 2 variable capacitance diode (D1, D2) backward end input reverse bias voltages, by adjusting described reverse bias voltage, the junction capacitance of described variable capacitance diode also changes thereupon, and the amplifier in characteristic impedance described in realization changes, and standing-wave ratio is adjusted.
2. require the low noise amplifier Input matching standing-wave ratio Circuit tuning described in 1 according to power, it is characterized in that: also comprise single-chip microcomputer, D/A chip and in-phase proportion operational amplifier, D/A chip described in wherein said Single-chip Controlling exports analog voltage to described in-phase proportion operational amplifier, and described analog voltage is amplified the reverse bias voltage generated needed for described variable capacitance diode by described in-phase proportion operation method device.
3. require the low noise amplifier Input matching standing-wave ratio Circuit tuning described in 1 according to power, it is characterized in that: described in-phase proportion operational amplifier is chip LM258.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410770950.2A CN104467692A (en) | 2014-12-15 | 2014-12-15 | Input-matching standing-wave ratio adjusting circuit for low-noise amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410770950.2A CN104467692A (en) | 2014-12-15 | 2014-12-15 | Input-matching standing-wave ratio adjusting circuit for low-noise amplifier |
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| CN104467692A true CN104467692A (en) | 2015-03-25 |
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| CN201410770950.2A Pending CN104467692A (en) | 2014-12-15 | 2014-12-15 | Input-matching standing-wave ratio adjusting circuit for low-noise amplifier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107124192A (en) * | 2017-04-28 | 2017-09-01 | 维沃移动通信有限公司 | A kind of radio circuit and mobile terminal |
| CN112332784A (en) * | 2020-10-30 | 2021-02-05 | 上海航天测控通信研究所 | Low-noise high-gain direct current amplification integrating circuit for radiometer receiver |
| CN112737705A (en) * | 2020-12-29 | 2021-04-30 | 京信网络系统股份有限公司 | Automatic electronic tuning device and automatic electronic tuning method for standing-wave ratio |
-
2014
- 2014-12-15 CN CN201410770950.2A patent/CN104467692A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107124192A (en) * | 2017-04-28 | 2017-09-01 | 维沃移动通信有限公司 | A kind of radio circuit and mobile terminal |
| CN107124192B (en) * | 2017-04-28 | 2019-07-26 | 维沃移动通信有限公司 | A kind of radio circuit and mobile terminal |
| CN112332784A (en) * | 2020-10-30 | 2021-02-05 | 上海航天测控通信研究所 | Low-noise high-gain direct current amplification integrating circuit for radiometer receiver |
| CN112737705A (en) * | 2020-12-29 | 2021-04-30 | 京信网络系统股份有限公司 | Automatic electronic tuning device and automatic electronic tuning method for standing-wave ratio |
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