KR20100137772A - Power amplifier with wilkinson-type divider/combiners and mobile communication system comprising the power amplifier - Google Patents

Power amplifier with wilkinson-type divider/combiners and mobile communication system comprising the power amplifier Download PDF

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Publication number
KR20100137772A
KR20100137772A KR1020090055984A KR20090055984A KR20100137772A KR 20100137772 A KR20100137772 A KR 20100137772A KR 1020090055984 A KR1020090055984 A KR 1020090055984A KR 20090055984 A KR20090055984 A KR 20090055984A KR 20100137772 A KR20100137772 A KR 20100137772A
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KR
South Korea
Prior art keywords
amplifier
signal
present
divider
output
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KR1020090055984A
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Korean (ko)
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오상화
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오상화
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Priority to KR1020090055984A priority Critical patent/KR20100137772A/en
Publication of KR20100137772A publication Critical patent/KR20100137772A/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0288—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/198—A hybrid coupler being used as coupling circuit between stages of an amplifier circuit

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE: By eliminating additional hardwares which install in order to emit the lost heat the amplifier of the distributor of the Wilkins type and coupler structure and the apparatus for mobile communications equipping this make low the cost of the telecommunication device. CONSTITUTION: The distributor(20) of the Wilkins - type divides the inputted signal into a plurality of signals. It shrinks as the number of final signal which the electricity is divided of the inputted signal as described above. The electricity of being divided as described above is applied in divided each signal.

Description

Power amplifier with Wilkinson-Type divider / combiners and mobile communication system comprising the power amplifier

The present invention relates to a mobile communication device, and more particularly, to an amplifier having a structure for greatly improving the output efficiency of a mobile communication device.

The efficiency at the output of communication equipment is very low. This is because the output of the signal at the output terminal of the communication equipment should not be too large in order to minimize the interference of the signal emitted from the output terminal of the communication equipment with signals from other communication providers due to the nature of the communication signal. The efficiency of currently used mobile communication equipment is about 10%. This means, for example, to supply 300 watts of input power for a 30-watt RF output.

In order to improve the low efficiency of such a communication signal, methods for increasing the output power of a conventionally used amplifier have been proposed, and most of these attempt to increase the output efficiency by improving the linearity of devices used in communication equipment. Pre-Distortions, Feedforward, etc. are used to improve the linearity. Also, a method of improving linearity by using power combinations such as push-pull, parallel, and balanced is used. By using the results of such schemes, we try to provide a high efficiency amplifier at the output stage.

For example, the conventional power combination method has a structure as shown in FIG. 1. 1 illustrates an example of a conventional amplifier. In FIG. 1, the amplifiers AMP 10 and 11 amplify the input signal by the gain of the amplifier, and the output value of the amplifier is mainly expressed as a power value.

 In FIG. 1, the signal amplified by the amplifiers 10 and 11 is input to the divider 12, and the power of the input signal is divided in half by the divider 12 so that the final stage amplifiers (Power AMP, PA) Is applied to (13, 14). The applied signal is again amplified by the respective amplifier gains and output through the combiner 15 and propagated across the antenna 16.

The conventional method disclosed in FIG. 1 combines the final stage amplifiers 13 and 14 to improve linearity. The distributor 12 and the combiner 15 used in this case are generally implemented in a hybrid method.

The Hybrid method, as is well known, has a phase difference of 90 kHz between input and output.

In FIG. 1, it is assumed that the signal power at the stage 100 is 10 dBm, the gain of the amplifier (AMP) 11 and the PAs 13 and 14 is 10, and the insertion loss of the divider and the combiner is -3 dB. Then, 20 dBm amplified by the gain of the AMP 11 is divided in half through the divider 12 and outputted as two 10 dBm, which are applied as inputs to the respective PAs 13 and 14. Then, at 110, the signal output value is 10dBm, which is divided in half through the divider 12, is amplified by gain by the PAs 13 and 14 to 20dBm, and is again outputted through the combiner 15. The signal value at 120 is propagated through the antenna 16, which is 23 dBm, which is a result of the coupler insertion loss.

In other words, even at the output terminal of each communication device, even if one signal is distributed and the amplified signal is combined again, the efficiency of the final signal output is not very high.

This low efficiency is of course not only a problem of the low efficiency itself, but the extra power that does not change from the input power to the radio frequency (RF) output, which is the final output, is mainly caused by heat loss. Then, since various types of additional devices have to be added to dissipate the lost heat, the size of the communication equipment also increases due to the increase in the price of the communication equipment and the added devices.

The technical problem to be achieved by the present invention, to solve the above problems, to provide an amplifier capable of amplifying the input signal with high efficiency.

Another technical problem to be achieved by the present invention is to provide a mobile communication device including the amplifier as described above.

According to an aspect of the present invention, an amplifier of a Wilkins type divider and combiner structure includes: a Wilkinson-type divider for dividing an input signal into a plurality of signals; A first amplifier for amplifying in parallel the power of each signal divided by the divider; And a Wilkins-type combiner for coupling the plurality of amplified signals. The amplifier further includes a second amplifier for amplifying the output of the combiner.

Preferably, the divider and the combiner have the same phase with each input and output, the isolation characteristic is more than a predetermined value, and the preset value of the isolation characteristic is substantially -40 dB.

The mobile communication device according to the present invention for solving the another technical problem includes the above amplifier.

According to the present invention, it is possible to amplify an input signal with high efficiency.

In addition, by increasing the efficiency, it is possible to operate communication equipment while consuming only a small amount of power, and to provide a mobile communication equipment which eliminates or greatly reduces the additional devices that are mounted to dissipate heat lost due to input power not converted into RF output. This can lower the cost of communication equipment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 shows an example of the configuration of an amplifier according to the present invention. The divider 20 divides the input signal into a plurality of signals (for example, divides one signal into n signals), and at this time, the power of the input signal is also reduced by the number of final signals to be divided. Is applied to the signal. The signals divided by the divider 20 are amplified using the amplifier 22. At this time, the power of each signal is amplified, and as shown in FIG. 2, the signals are amplified in parallel at this time. Combiner 24 combines these amplified signals into one signal (eg, combines n signals into one signal).

Operation of the configuration according to the present invention as described above is described in more detail in the embodiment of FIG.

3 illustrates a configuration of an amplifier according to the present invention, which may correspond to an output terminal of a wireless communication device.

The amplifier of FIG. 3 includes a divider 30 for dividing an input signal into a plurality of signals, first amplifiers 32 and 33 for amplifying in parallel the power of each signal divided by the divider 30 and the amplified signal. A combiner 34 that combines the plurality of signals. And a second amplifier 36 which amplifies the output of the combiner 34. This amplified signal will be transmitted through the antenna 37.

In the embodiment of Fig. 3, the divider 30 divides the input signal into two signals and distributes them to the respective amplifiers 32 and 33 of the first amplifier section. This is only an example, and it is also possible to divide the signal input to the divider 30 into a larger number of signals. It may be possible to divide the signal into three or more signals by using one distribution element, and output two or more divided signals by using several distribution elements that distribute one input to two outputs as shown in FIG. It would be possible. The same is true of the combiner 34, so that not only the combiner 34 combines the two signals, but it is also possible, depending on the embodiment, to combine a larger number of signals in accordance with the configuration of the divider 30. It will be apparent to those skilled in the art having ordinary skill in the art.

It is also assumed that the insertion loss of the combiner 34 is -3 dB.

At this time, the distributor 30 is a Wilkinson-type distributor, and the combiner 34 is also a Wilkins-type combiner. Such a divider 30 and a combiner 34 can each have the same phase (in phase) with their inputs and outputs, their isolation characteristics can be substantially -40 dB, or higher. have.

In FIG. 3, the first amplifiers 32 and 33 are shown as AMPs and the second amplifiers 36 as PAs for ease of comparison with the configuration of FIG.

In FIG. 3, the power value of the signal of reference number 300 input to the divider 30 is 10 dBm, and each of the elements of the first amplifier AMPs 32 and 33 and the second amplifier PA 36 has a gain of 10, respectively. Assume Then, each signal power value at 310 becomes 5 dBm divided in half by the divider 30, and then 15 dBm amplified by the AMP 32, 33 gain. The signal output at 320 is 33dBm, which is the sum of the coupler insertion loss and the two AMP (32, 33) outputs. The signal output at 230 which is the final output value amplified by the PA 36, which is the second amplifier, is outputted by 43dBm amplified by the PA gain and propagated through the antenna 37.

Comparing the results in FIG. 3 according to the invention with the results in the prior art of FIG. 1, it can be seen that the number of distributors, combiners and amplification elements is the same, but the result of the amplified final output is significantly different. .

The amplification operation using the structure according to the present invention as described above will be described in more detail below.

Comparing the Power Combination structure according to the embodiment of FIG. 3 with the prior art, in the related art, a hybrid scheme in which the combiner and the divider have a 90-degree phase difference and the isolation characteristic has a characteristic value of about -20 dB Design and use However, the splitter or coupler used in the present invention has the in-phase, and the isolation characteristic has a value of approximately -40 dB, and since the isolation characteristic has a value twice as large as before, Better improvement can be achieved than the prior art Power Combination structure.

In addition, the power combination structure used in the present invention is applied at the input portion of the final amplification stage PA 36. In general, it is necessary to keep the signal input to the final stage amplification stage clean, without distortion, which is usually possible only if the isolation characteristic of about 20dB than the gain of the entire amplifier is secured. The combiner and divider used in the case of the prior art cannot secure such isolation characteristics, but in the case of the present invention, since the Wilkins-type divider and combiner are used to provide a high isolation characteristic, the above isolation ratio is 20 dB or more. Isolation can be secured.

That is, the design of the in-phase distributor and combiner having high isolation characteristics as in the present invention is designed to have the structure of the Wilkinson type distributor and combiner having high isolation. This in-phase Power Combination structure provides the effect of increasing the linear region in the characteristic curve of the amplifier, thereby improving the linearity.

All signals are represented as waveforms with amplitude and phase in nature. When two waveforms having the same magnitude in phase are combined, they are multiplied to double the amplitude and not change the phase. For this reason, in the power combination structure of FIG. 3 to which the present invention is applied, the linearity of the output at the final stage is improved.

4A and 4B illustrate the power combination structure of the structure shown in FIG. 3 according to the present invention in terms of amplifier characteristic curves. Figure 4a is an amplifier characteristic curve, Figure 4b is an amplifier characteristic curve for the result of the power combination structure according to the present invention.

The increase in the linear region as shown in FIG. 4b means that the output can be increased by the gain of the amplifier without distortion to the signal waveform. As a result, the amplifier of the final stage does not have to increase the gain of the amplifier in order to increase the amplification efficiency. . If the gain is increased due to the characteristics of the amplifier, it is not possible to make an efficient amplifier because the linear characteristics have to be sacrificed. The present invention provides a method for increasing efficiency while amplifying without increasing the gain of the final stage amplifier.

In other words, by using the present invention, it is possible to design an amplifier that can make the most of the linear range while reducing the gain of the final stage amplifier. In this case, an amplifier of high efficiency can be made.

In summary, the basic principle of the present invention is to improve the signal input to the final stage amplifier by combining several amplifiers going into the final stage in parallel, instead of connecting the final amplifier stages in parallel during power combination as in the prior art. This is to increase the efficiency of the amplifier. Improving the amplifier input signal applied to the final stage theoretically improves the linearity of the amplifier, and it is difficult to expect more than the improvement effect of the insertion loss of the coupler in the prior art. In addition, since the improvement effect can be added as much as the output value of the amplifier coupled in parallel, it suggests a way to make the amplifier more efficient than the conventional.

5 shows a schematic block diagram of a repeater having an output stage providing the high power of FIG. 3 in accordance with the present invention. In FIG. 5, portions denoted by the DAMs 50 and 55 are the same as those denoted by reference numerals 30 to 35 of FIG. 3.

According to an embodiment, the second amplifying unit of reference numeral 36 of FIG. 3 may be included in the DAMs 50 and 55 of FIG. 5, or may be implemented by the SSPS of reference numeral 56 of FIG. 5. The signal input to the DAM 50 is processed in accordance with the present invention and amplified in the SSPA 51 and transmitted to the antenna 53 through the duplexer 52 and propagated under the control of the upstream controller. Alternatively, the signal transmitted through the antenna 53 is processed in the DAM 55 operating according to the present invention, amplified in the SSPA 56 under the control of the downlink controller, and propagated through the duplexer 57 and the antenna 58. .

Since the structure of the repeater of FIG. 5 as described above is for illustrating a field to which the amplifier according to the present invention can be applied, further description will be omitted.

Mobile communication equipment according to an embodiment of the present invention includes the amplifier described above. Such an amplifier may be embedded or mounted in the mobile communication equipment as needed. Such mobile communication equipment may be a repeater, for example, may be a relatively large user equipment, and may be applied to a base station or a repeater equipment requiring a large output. Such a mobile communication device according to the present invention is not additionally limited.

Combining the amplifier according to the present invention with other elements of the mobile communication equipment according to the present invention, and operating in accordance with the present invention in accordance with the manner required for communication is a person of ordinary skill in the art It is self-evident to. Therefore, a separate description thereof will be omitted.

Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. Examples included in the above description are introduced for the understanding of the present invention, and these examples do not limit the spirit and scope of the present invention. It will be apparent to those skilled in the art that various embodiments in accordance with the present invention in addition to the above examples are possible. The scope of the present invention is shown not in the above description but in the claims, and all differences within the scope will be construed as being included in the present invention.

The amplifier according to the present invention is used in a repeater equipped with a high efficiency amplifier output stage, so that it can be applied more effectively to a base station or a large output repeater equipment. In addition, the mobile communication equipment according to the present invention, including the amplifier according to the present invention, can also be used for high efficiency amplification.

1 illustrates an example of a conventional amplifier.

2 shows an example of the configuration of an amplifier according to the present invention.

3 illustrates a configuration of an amplifier according to the present invention, which may correspond to an output terminal of a wireless communication device.

Figure 4a is an amplifier characteristic curve, Figure 4b is an amplifier characteristic curve for the result of the power combination structure according to the present invention.

5 shows a schematic block diagram of a repeater with an output stage providing the high power of FIG. 3 in accordance with the present invention.

Claims (5)

A Wilkinson-type divider for dividing an input signal into a plurality of signals; A first amplifier for amplifying in parallel the power of each signal divided by the divider; And And a Wilkins-type combiner for coupling the plurality of amplified signals. The method of claim 1, And a second amplifier for amplifying the output of the combiner, the Wilkins type divider and combiner structure amplifier. The method of claim 1, Wherein said divider and combiner has the same phase with each input and output, and the isolation characteristic is above a predetermined value. The method of claim 3, And a predetermined value of said isolation characteristic is substantially -40 dB. Mobile communication equipment comprising an amplifier according to any one of the preceding claims.
KR1020090055984A 2009-06-23 2009-06-23 Power amplifier with wilkinson-type divider/combiners and mobile communication system comprising the power amplifier KR20100137772A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9270007B2 (en) 2013-06-18 2016-02-23 Electronics And Telecommunications Research Institute Power divider

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9270007B2 (en) 2013-06-18 2016-02-23 Electronics And Telecommunications Research Institute Power divider

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