CN208226979U - Limiter for broadband power amplifier - Google Patents
Limiter for broadband power amplifier Download PDFInfo
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- CN208226979U CN208226979U CN201820699193.8U CN201820699193U CN208226979U CN 208226979 U CN208226979 U CN 208226979U CN 201820699193 U CN201820699193 U CN 201820699193U CN 208226979 U CN208226979 U CN 208226979U
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- power tube
- limiter
- capacitor
- power amplifier
- clipping
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Abstract
The utility model proposes a kind of limiter for broadband power amplifier, it is related to the limiter technology for broadband power amplifier.Limiter diode can cover wider frequency band at present, due to the influence of parasitic parameter, when clipping for broad band amplifier can extra band carry out gain fluctuation, in broadband range, limiting threshold difference is larger, and clipping thresholding can not adjust；Active limiter clipping leakage power 4~8dB usually big compared with clipping starting point, and it is influenced by clipping thresholding, will lead to non-linear penalties, when which usually requires actual test could accurate evaluation its influence to design, influence design schedule and increase project risk.In order to solve the above problem, its technical solution is summarized are as follows: the drain voltage of power tube is controlled by adjustable LDO, and then power tube work is controlled in the case where setting voltage, to which the clipping leakage power of limiter is reduced to 1~2dB, and clipping thresholding can be debugged in plate, additional effect will not be brought to link on broadband performance, non-linear penalties are easy to assess.
Description
Technical field
The utility model relates to limiter technologies, in particular to applied to the limiter of broadband power amplifier in power amplifier link
Technology.
Background technique
Limiter can be usually used in power amplifier transmitting link to guarantee the anti-overdriving ability of power amplifier.Common design form
Are as follows:
1, limiter diode.Specifically: limiter diode is connected in reverse parallel on the radio frequency link of power amplifier, radiofrequency signal is worked as
Smaller, high impedance is presented in not up to diode current flow clipping thresholding, diode on the transmission line in parallel, on signal without influence；
When signal gradually increases, diode limiting thresholding, diode current flow are met or exceeded, junction resistance becomes smaller, and is formed on transmission line
Short-circuit face, most of power are reflected, and achieve the purpose that protect Sensitive Apparatus.
2, other active limiters.Specifically: part integrates active limiter, real by MMIC technology mostly by formula
The wideband performance and clipping thresholding of existing device are settable, more convenient to use.
But correspondence has the following problems in above two limiter at present:
1, limiter diode can cover wider frequency band, but narrowband is usually applicable only in practical application, since parasitism is joined
Several influences, when clipping for broad band amplifier can extra band carry out gain fluctuation, in broadband range, limiting threshold difference
Larger, broadband range here is 1GHz~5GHz.The clipping thresholding of limiter diode can not adjust, and input power is more than limit
After amplitude, slowly, output power will increase about 6dB or more with input power increase for compression, have to the protective capability of amplification link
Limit.
2, the wideband performance of active limiter betters meet the application of broadband power amplifier, but the clipping leakage of active limiter
Power (Leakage power) 4~8dB usually big compared with clipping starting point, and influenced by clipping thresholding, while active clipping
Device will lead to non-linear penalties, when which usually requires actual test could accurate evaluation its influence to design, influence to set
Meter progress and increase project risk.
Utility model content
The purpose of the utility model is to provide a kind of limiters for broadband power amplifier, and solving current limiter diode can cover
Cover wider frequency band, due to the influence of parasitic parameter, when clipping for broad band amplifier can extra band carry out gain fluctuation, in width
In band range, limiting threshold difference is larger, and clipping thresholding can not adjust；Active limiter clipping leakage power usually relatively limits
Big 4~the 8dB of width starting point, and influenced by clipping thresholding, it will lead to non-linear penalties, when which usually requires actual test
Its influence to design of ability accurate evaluation, the problem of influencing design schedule and increase project risk.
The utility model solves its technical problem, the technical solution adopted is that: for the limiter of broadband power amplifier, feature
It is, including low pressure difference linear voltage regulator, power tube, first resistor, second resistance, 3rd resistor, first capacitor, the second electricity
Appearance, third capacitor, the 4th capacitor, the first inductance and ground wire, the input terminal of the low pressure difference linear voltage regulator is for connecting drain electrode
Voltage source, ground terminal are separately connected one end of first resistor and one end of second resistance, and the other end of first resistor connects low pressure
The output end of difference linear constant voltage regulator, the other end of second resistance connect ground wire, and one end connection low pressure difference linearity of first capacitor is steady
The output end of depressor, the other end connect ground wire, the output end of one end connection low pressure difference linear voltage regulator of the second capacitor, the other end
Ground wire, the output end of one end connection low pressure difference linear voltage regulator of the first inductance are connected, the other end connects the drain electrode of power tube, the
One end of four capacitors connects the grid of power tube for connecting rf inputs, the other end, and one end of 3rd resistor is for connecting
Gate-voltage source, the other end connect the grid of power tube, and the source electrode of power tube connects ground wire, and one end of third capacitor connects power amplifier
The drain electrode of pipe, the other end is for connecting RF output end.
Further, in order to guarantee the normal work of low pressure difference linear voltage regulator and power tube, the drain voltage source is
DC voltage source, in order to make power tube play the role of clipping, the voltage value in the drain voltage source is 28V or 48V.
Further, in order to guarantee the normal work of power tube, grid supply voltage, the grid electricity are provided for power tube
Potential source is DC voltage source, in order to make power tube work under regulation operating voltage, the range of voltage values of the gate-voltage source
For -5V~-1V.
Further, in order to guarantee that gate-voltage source preferably provides DC voltage, choke suppress radiofrequency signal, while improving function
The stability of pipe is put, the 3rd resistor is the grid supplying resistance of power tube, and the Standard resistance range of the 3rd resistor is 10 Ω
~100 Ω.
Further, in order to allow DC voltage to pass through, while controlling radiofrequency signal, first inductance be enameled wire around
The air core inductor of system.
Further, the power tube is the gallium nitride power tube of model TGF2023-2-01.
Further, the power tube is NMOS tube.
Further, in order to which the clipping leakage power of limiter is reduced to 1~2dB, and clipping thresholding can be debugged in plate,
Additional effect will not be brought to link on broadband performance, non-linear penalties is made to be easy to assess, the operating voltage of the power tube
Range of voltage values be 3V~10V.
The utility model has the beneficial effects that by the above-mentioned limiter for broadband power amplifier, by adjusting first resistor
So that the drain voltage for supplying power tube is changed with second resistance, and then adjusts the output power ability of power tube and resist relatively
Fillip.To play the role of clipping, it is the device of 28V to 48V that power tube, which usually selects rated operational voltage, then by work
Voltage drop is used as low as 3V to 10V, and rated power is also corresponding to decline about 10dB or more, and compares rated power as one
The small power amplifier pipe of small 10dB or more uses, and due to significantly reducing the operating voltage of power tube, can work in supersaturation
10dB or more is without failing, to protect the subsequent promotion of link and final stage power amplifier pipe, while power tube will not occur for power tube
Common voltage breakdown failure and thermal failure, resistance to overdriving ability can significantly improve.Also, power tube once enters clipping Qu work
Make, gain is by Fast Compression.
After reaching the power points that clipping starts to control, by Fast Compression, saturation power, which is only greater than, starts to control power for the gain of limiter
1~2dB of point, protects rear class link well, and the program is highly suitable for power amplifier link design, and clipping thresholding is adjustable, is easy
Device is assessed on the influence of broad band amplifier bring flatness and non-linear effects.
Detailed description of the invention
Fig. 1 is circuit structure diagram of the utility model for the limiter of broadband power amplifier.
Wherein, R1 is first resistor, and R2 is second resistance, and R3 is 3rd resistor, and LDO is low pressure difference linear voltage regulator, U1
For power tube, C1 is first capacitor, and C2 is the second capacitor, and C3 is third capacitor, and C4 is the 4th capacitor, and L1 is the first inductance, IN
For the input terminal of low pressure difference linear voltage regulator, OUT is the output end of low pressure difference linear voltage regulator, and ADJ is low pressure difference linearity pressure stabilizing
The ground terminal of device.
Specific embodiment
Below with reference to examples and drawings, the technical solution of the utility model is described in detail.
Limiter described in the utility model for broadband power amplifier, by low pressure difference linear voltage regulator LDO, power tube U1,
One resistance R1, second resistance R2,3rd resistor R3, first capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor C4,
One inductance L1 and ground wire composition, circuit structure diagram is referring to Fig. 1, wherein the input terminal IN of low pressure difference linear voltage regulator LDO is used
In connection drain voltage source, ground terminal ADJ is separately connected one end of first resistor R1 and one end of second resistance R2, first resistor
The other end connection ground wire of the output end OUT of the other end connection low pressure difference linear voltage regulator LDO of R1, second resistance R2, first
The output end OUT of one end connection low pressure difference linear voltage regulator LDO of capacitor C1, other end connection ground wire, the one of the second capacitor C2
The output end OUT of end connection low pressure difference linear voltage regulator LDO, the other end connect ground wire, and one end of the first inductance L1 connects low pressure
The output end of difference linear constant voltage regulator LDO, the other end connect the drain electrode of power tube U1, and one end of the 4th capacitor C4 is for connecting radio frequency
Input terminal, the other end connect the grid of power tube U1, and one end of 3rd resistor R3 is for connecting gate-voltage source, other end connection
The grid of power tube U1, the source electrode of power tube U1 connect ground wire, and one end of third capacitor C3 connects the drain electrode of power tube U1, separately
One end is for connecting RF output end, wherein and first capacitor C1 and the second capacitor C2 is used to be filtered drain voltage source, the
Three capacitor C3 and the 4th capacitor C4 control direct current signal for leading to radiofrequency signal.
Here, so that the drain voltage for supplying power tube is changed by adjusting first resistor and second resistance, make power amplifier
The range of voltage values of the operating voltage of pipe is 3V~10V, to can make clipping while the clipping effect for guaranteeing limiter
The saturation power of device, which is only greater than, starts to control 1~2dB of power points, protects rear class link well.
Embodiment
The utility model embodiment is used for the limiter of broadband power amplifier, including low pressure difference linear voltage regulator LDO, power tube
U1, first resistor R1, second resistance R2,3rd resistor R3, first capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor
C4, the first inductance L1 and ground wire, wherein the input terminal IN of low pressure difference linear voltage regulator LDO is grounded for connecting drain voltage source
End ADJ is separately connected one end of first resistor R1 and one end of second resistance R2, and the other end of first resistor R1 connects low voltage difference
The other end of the output end OUT of linear voltage regulator LDO, second resistance R2 connect ground wire, and one end of first capacitor C1 connects low pressure
The output end OUT of difference linear constant voltage regulator LDO, the other end connect ground wire, and one end of the second capacitor C2 connects low pressure difference linearity pressure stabilizing
The output end OUT of device LDO, the other end connect ground wire, and one end connection low pressure difference linear voltage regulator LDO's of the first inductance L1 is defeated
Outlet, the other end connect the drain electrode of power tube U1, and one end of the 4th capacitor C4 connects function for connecting rf inputs, the other end
The grid of pipe U1 is put, one end of 3rd resistor R3 connects the grid of power tube U1, power amplifier for connecting gate-voltage source, the other end
The source electrode of pipe U1 connects ground wire, and the drain electrode of one end connection power tube U1 of third capacitor C3, the other end is for connecting radio frequency output
End.
In foregoing circuit, in order to guarantee the normal work of low pressure difference linear voltage regulator LDO and power tube U1, drain voltage source
Preferably DC voltage source, in order to make power tube U1 play the role of clipping, the voltage value in drain voltage source can be 28V or 48V,
It is 28V in this example；In order to guarantee the normal work of power tube U1, grid supply voltage, gate-voltage source are provided for power tube U1
Preferably DC voltage source, in order to make power tube U1 work under regulation operating voltage, the range of voltage values of gate-voltage source is excellent
It is selected as -5V~-1V；In order to guarantee that gate-voltage source preferably provides DC voltage, choke suppress radiofrequency signal, while improving power tube
The stability of U1,3rd resistor R3 are the grid supplying resistance of power tube U1, and the Standard resistance range of 3rd resistor R3 is preferably 10 Ω
~100 Ω；In order to allow DC voltage to pass through, while controlling radiofrequency signal, the first inductance L1 is preferably the sky of enameled wire coiling
Electrocardio sense；Power tube U1 can be the gallium nitride power tube of model TGF2023-2-01, and power tube U1 may be NMOS tube,
It is illustrated in this example with the gallium nitride power tube of model TGF2023-2-01；In order to which the clipping leakage power of limiter is dropped
As low as 1~2dB, and clipping thresholding can be debugged in plate, will not bring additional effect to link on broadband performance, make non-linear evil
Change is easy to assess, and the range of voltage values of the operating voltage of power tube U1 is preferably 3V~10V, is said by taking 5.5V as an example in this example
It is bright.
In practical application, the gallium nitride power tube of model TGF2023-2-01, the voltage value of gate-voltage source is
28V, operating voltage value 5.5V, according to actual needs, the limiter for broadband power amplifier of this example is as power amplifier link
Second level amplifier is attached use, and here, link is amplified in the broadband applied to 1GHz~5GHz.In the work of power tube U1
Voltage value be respectively under 28V and 5.5V 1dB power compression point and saturation power test value table it is as follows:
By upper table as it can be seen that causing the power output capacity of power tube U1 to reduce with the decline that power tube U1 leakage is pressed
About 10dB, power tube U1 fall under 1dB power compression point to saturation power range, output gain meeting rapidly in output, can only give
The third level brings the mistake of 1-2dB to push away, and the leakage pressure of the second level is adjusted when practical joint debugging, makes its nominal operation in 1dB power compression point
Near rollback 0.5dB, can influence by its non-linear penalties to link it is near minimum, harmonics restraint about deteriorates 0.3dB.It can
Know, power tube is both used as amplifier, further through being substantially depressured, uses as crucial clipping device, to the mistake of rear class power tube
Excitation is protected clearly, due to that only the mistake of 1-2dB can be brought to push away to rear class, when the anti-overdriving ability of final stage device is poor,
Such as domesticize the power tube at the initial stage that substitutes, and is applicable in very much.Also, actually used power tube can carry out different according to disparity items
Type selecting, but to power amplifier design personnel, selectable device and scheme are very easy to, and the second level optimum of power amplifier link uses
The program.
Claims (8)
1. being used for the limiter of broadband power amplifier, which is characterized in that including low pressure difference linear voltage regulator, power tube, first resistor, the
Two resistance, 3rd resistor, first capacitor, the second capacitor, third capacitor, the 4th capacitor, the first inductance and ground wire, the low voltage difference
For the input terminal of linear voltage regulator for connecting drain voltage source, ground terminal is separately connected one end and the second resistance of first resistor
One end, the output end of the other end connection low pressure difference linear voltage regulator of first resistor, the other end of second resistance connect ground wire, the
The output end of one end connection low pressure difference linear voltage regulator of one capacitor, the other end connect ground wire, and one end connection of the second capacitor is low
The output end of pressure difference linear voltage regulator, the other end connect ground wire, and one end of the first inductance connects the defeated of low pressure difference linear voltage regulator
Outlet, the other end connect the drain electrode of power tube, and one end of the 4th capacitor connects power tube for connecting rf inputs, the other end
Grid, one end of 3rd resistor connects the grid of power tube for connecting gate-voltage source, the other end, and the source electrode of power tube connects
Ground line, the drain electrode of one end connection power tube of third capacitor, the other end is for connecting RF output end.
2. the limiter according to claim 1 for broadband power amplifier, which is characterized in that the drain voltage source is direct current
Voltage source, the voltage value in the drain voltage source are 28V or 48V.
3. the limiter according to claim 1 for broadband power amplifier, which is characterized in that the gate-voltage source is direct current
Voltage source, the range of voltage values of the gate-voltage source are -5V~-1V.
4. the limiter according to claim 1 for broadband power amplifier, which is characterized in that the 3rd resistor is power tube
Grid supplying resistance, the Standard resistance range of the 3rd resistor is the Ω of 10 Ω~100.
5. the limiter according to claim 1 for broadband power amplifier, which is characterized in that first inductance is enameled wire
The air core inductor of coiling.
6. the limiter according to claim 1 for broadband power amplifier, which is characterized in that the power tube is model
The gallium nitride power tube of TGF2023-2-01.
7. the limiter according to claim 1 for broadband power amplifier, which is characterized in that the power tube is NMOS tube.
8. the limiter of broadband power amplifier is used for described in -7 any one according to claim 1, which is characterized in that the power tube
Operating voltage range of voltage values be 3V~10V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820699193.8U CN208226979U (en) | 2018-05-11 | 2018-05-11 | Limiter for broadband power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820699193.8U CN208226979U (en) | 2018-05-11 | 2018-05-11 | Limiter for broadband power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208226979U true CN208226979U (en) | 2018-12-11 |
Family
ID=64511360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820699193.8U Active CN208226979U (en) | 2018-05-11 | 2018-05-11 | Limiter for broadband power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208226979U (en) |
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2018
- 2018-05-11 CN CN201820699193.8U patent/CN208226979U/en active Active
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