CN208285283U - A kind of ultra wide band analog predistortion device - Google Patents
A kind of ultra wide band analog predistortion device Download PDFInfo
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- CN208285283U CN208285283U CN201820772434.7U CN201820772434U CN208285283U CN 208285283 U CN208285283 U CN 208285283U CN 201820772434 U CN201820772434 U CN 201820772434U CN 208285283 U CN208285283 U CN 208285283U
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- frequency mixer
- power amplifier
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- predistortion
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Abstract
The utility model discloses a kind of ultra wide band analog predistortion devices, it includes the first frequency mixer and the second frequency mixer, the first frequency sweep local oscillator and the second frequency sweep local oscillator are connected separately on two frequency mixers, predistortion generator is connected on first frequency mixer, predistortion generator is connect with the second frequency mixer, and the second frequency mixer is connect with power amplifier.Input signal is converted to the radiofrequency signal of a fixed frequency using frequency mixer and frequency sweep local oscillator by this programme, then pre-distorted signals are generated using analog predistortion device, the frequency of input is converted into finally by frequency sweep local oscillator and frequency mixer, signal at this time contains the distorted signal opposite with power amplifier, this signal will offset the distortion of power amplifier itself generation after power amplifier, to realize the purpose for improving power amplifier linearity.
Description
Technical field
The utility model relates to power amplifier fields, and in particular to a kind of ultra wide band analog predistortion device.
Background technique
At present both at home and abroad simulated pre-distortion circuit be limited to bandwidth of a device, single predistortion circuit can only be directed to it is a certain specific
Frequency effectively and circuit complexity, the frequency range for tending to effectively use is relatively narrow, substantially using bandwidth within 15%.Generally make
The place relatively narrow used in bandwidth of operation such as the communications fields, and each predistortion device can only be directed to a certain specific power amplifier
It uses, poor universality generally requires customization.General analog predistortion device is unable to satisfy wide band power amplifier, so
The method that wide band power amplifier generally uses back-off realizes preferable linearization performance, this requires power amplifier
With higher output power, need to pay biggish cost.
Utility model content
For the above-mentioned deficiency of the prior art, the utility model provides a kind of power amplifier for ultra wide band,
For improve distributed power amplifier nonlinear characteristic ultra wide band analog predistortion device.
To reach above-mentioned purpose of utility model, the technology employed by the present utility model is
There is provided a kind of ultra wide band analog predistortion device comprising the first frequency mixer and the second frequency mixer, the first frequency mixer
Be connected separately with the first frequency sweep local oscillator and the second frequency sweep local oscillator on the second frequency mixer, the first frequency mixer and predistortion generator connect
It connects, predistortion generator is connect with the second frequency mixer, and the second frequency mixer is connect with power amplifier.
Further, it is also connected with power splitter between the first frequency mixer and predistortion generator, is connected with and prolongs on power splitter
When circuit, be also connected with phase modulation circuit, modulation circuit and synthesizer between predistortion generator and the second frequency mixer in turn, be delayed
Circuit is connect with synthesizer.
The utility model has the following beneficial effects: this programme is used for the power amplifier of ultra wide band, for improving ultra wide band power amplifier
Nonlinear characteristic, the third order intermodulation for improving power amplifier inhibit.Input signal is converted to one admittedly using frequency mixer and frequency sweep local oscillator
Determine the radiofrequency signal of frequency, then using the analog predistortion device for matching the frequency band, pre-distorted signals is generated, finally again by sweeping
Frequency local oscillator and frequency mixer are converted into the frequency of input, and signal at this time contains the distorted signal opposite with power amplifier, this
Signal will offset the distortion of power amplifier itself generation after power amplifier, improve power amplifier line to realize
The purpose of property.
The signal of fixed frequency can divide the signal into two-way by power splitter, all the way by predistortion generator, and pass through
Cross phase modulation, amplitude modulation obtains pre-distorted signals, in addition directly export by delay circuit all the way.Two paths of signals is closed by synthesizer
At obtaining pre-distorted signals.Frequency is reverted in input frequency by same frequency mixer and frequency sweep local oscillator again at this time, simultaneously
It is accompanied by pre-distorted signals.The pre-distorted signals supply power amplifier, and the distorted signal generated with power amplifier itself is rigid
It is good to offset, so that three rank signals of output be greatly reduced, improve the linearity of power amplifier.
This programme only needs the predistortion generator of a fixed frequency, that is, is suitable for the signal of Whole frequency band.By any frequency
The signal of rate moves the frequency of setting first to carry out pre-distortion, restores after having handled to original rate-adaptive pacemaker.No matter
How much is frequency input signal, and circuit occurs for the predistortion that a narrowband can be used to generate pre-distorted signals.
Detailed description of the invention
Fig. 1 is ultra wide band analog predistortion technology functional block diagram.
Fig. 2 is ultra wide band analog predistortion technology schematic diagram.
Specific embodiment
Specific embodiment of the present utility model is described below, in order to facilitate understanding by those skilled in the art
The utility model, it should be apparent that the utility model is not limited to the range of specific embodiment, to the common skill of the art
For art personnel, if various change the attached claims limit and determine the utility model spirit and scope in,
These variations are it will be apparent that all are created using the utility model of the utility model design in the column of protection.
As depicted in figs. 1 and 2, ultra wide band analog predistortion device includes the first frequency mixer and the second frequency mixer, and first is mixed
It is connected separately with the first frequency sweep local oscillator and the second frequency sweep local oscillator on frequency device and the second frequency mixer, connects active point on the first frequency mixer
Device is connected with predistortion generator and delay circuit on power splitter, be connected in turn on predistortion generator phase modulation circuit and
Modulation circuit, modulation circuit are connect with synthesizer with delay circuit, and synthesizer is connect with the second frequency mixer, the second frequency mixer with
Power amplifier connection.
Method using ultra wide band analog predistortion unit simulation predistortion includes:
S1 signal frequency conversion step: the two-tone signal that frequency is f1 and f1+K will be inputted and pass through the first frequency mixer and the first frequency sweep
Local oscillator is converted on fixed IF frequency f, obtains intermediate-freuqncy signal f and f+K；
Signal branch step: intermediate-freuqncy signal f and f+K are divided into two-way by power splitter；
S2 generates pre-distorted signals step: the signal all the way in two paths of signals is by predistortion generator, using phase modulation
Circuit and modulation circuit obtain pre-distorted signals, and in addition signal is directly exported by delay circuit all the way, and two paths of signals passes through again
Synthesizer synthesis, obtains the intermediate-freuqncy signal containing pre-distorted signals；
S3 restores frequency step: intermediate-freuqncy signal passes through the second frequency sweep local oscillator again and the second frequency mixer is restored to input signal
In the frequency of f1 and f1+K, while being accompanied by pre-distorted signals；
S4 offseting signal step: the output signal with predistortion is offset and power amplifier itself by power amplifier
The opposite distorted signal of distorted signal.
This programme will input the two-tone signal that frequency is f1 and f1+K, by the mixing and the first frequency sweep sheet of the first frequency mixer
The frequency sweep of vibration controls, and by frequency translation to fixed IF frequency f, obtains intermediate-freuqncy signal f and f+K, this signal is divided into two-way:
All the way by predistortion generator, desired pre-distorted signals are obtained using phase modulation circuit and modulation circuit, are in addition passed through all the way
Delay circuit is crossed directly to export；Two paths of signals is synthesized by synthesizer, obtains the intermediate-freuqncy signal with pre-distorted signals, at this time again
Frequency is reverted into input by the second frequency mixer same as the first frequency mixer and the first frequency sweep local oscillator and the second frequency sweep local oscillator
In the frequency of f1 and f1+K, while being accompanied by pre-distorted signals.The pre-distorted signals supply power amplifier, with power amplifier
The distorted signal itself generated is just offset, so that three rank signals of output be greatly reduced, improves the linearity of power amplifier.
This programme only needs the predistortion generator of a fixed frequency, that is, is suitable for the signal of Whole frequency band.Its core is
The signal of optional frequency is moved into the frequency of setting first to carry out pre-distortion, restores defeated to original frequency after having handled
Out.This ultra wide band pre-distortion technology can be applicable in the frequency of any ultra wide band, no matter frequency input signal how much, can be used
Circuit occurs for the predistortion of one narrowband to generate pre-distorted signals.
Claims (2)
1. a kind of ultra wide band analog predistortion device, which is characterized in that including the first frequency mixer and the second frequency mixer, described first
The first frequency sweep local oscillator and the second frequency sweep local oscillator, first frequency mixer and pre- mistake are connected separately on frequency mixer and the second frequency mixer
True generator connection, the predistortion generator are connect with the second frequency mixer, and second frequency mixer is connect with power amplifier.
2. ultra wide band analog predistortion device according to claim 1, which is characterized in that first frequency mixer and pre- mistake
It is also connected with power splitter between true generator, delay circuit, the predistortion generator and second are connected on the power splitter
Also it is connected with phase modulation circuit, modulation circuit and synthesizer between frequency mixer in turn, the delay circuit is connect with synthesizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820772434.7U CN208285283U (en) | 2018-05-23 | 2018-05-23 | A kind of ultra wide band analog predistortion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820772434.7U CN208285283U (en) | 2018-05-23 | 2018-05-23 | A kind of ultra wide band analog predistortion device |
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| Publication Number | Publication Date |
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| CN208285283U true CN208285283U (en) | 2018-12-25 |
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| CN201820772434.7U Active CN208285283U (en) | 2018-05-23 | 2018-05-23 | A kind of ultra wide band analog predistortion device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108494373A (en) * | 2018-05-23 | 2018-09-04 | 成都四威功率电子科技有限公司 | A kind of ultra wide band analog predistortion and device |
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2018
- 2018-05-23 CN CN201820772434.7U patent/CN208285283U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108494373A (en) * | 2018-05-23 | 2018-09-04 | 成都四威功率电子科技有限公司 | A kind of ultra wide band analog predistortion and device |
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