CN217159655U - Power amplifier matching circuit of U/V frequency band broadband radio station - Google Patents

Power amplifier matching circuit of U/V frequency band broadband radio station Download PDF

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CN217159655U
CN217159655U CN202123270687.5U CN202123270687U CN217159655U CN 217159655 U CN217159655 U CN 217159655U CN 202123270687 U CN202123270687 U CN 202123270687U CN 217159655 U CN217159655 U CN 217159655U
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balun
capacitor
unbalanced
balanced
power amplifier
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吴晓春
陈振
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Shanghai Institute of Microwave Technology CETC 50 Research Institute
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Shanghai Institute of Microwave Technology CETC 50 Research Institute
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The utility model provides a U/V frequency channel broadband radio station power amplifier matching circuit, a serial communication port, include: power tube V1, input matching circuit and output matching circuit. The utility model discloses a balun of adding the ferrite magnetic ring realizes the high low impedance conversion of broadband, and power amplifier input matching realizes high impedance to low impedance conversion by 4:1 balun and thereby realizes the broadband input matching, and output matching circuit adopts 1:4 balun to realize low impedance to high impedance conversion, realizes the best power matching of broadband.

Description

Power amplifier matching circuit of U/V frequency band broadband radio station
Technical Field
The utility model relates to a broadband radio station power amplifier matching circuit technical field specifically relates to a U/V frequency channel broadband radio station power amplifier matching circuit.
Background
The performance of the power amplifier, which is one of the key components of the station, determines the performance of the whole station. With the rapid development of the present digital modulation technology, the requirements for designing the station power amplifier are also higher and higher, especially in consideration of power, efficiency, bandwidth, and the like of the power amplifier. The traditional narrow-band power amplifier design cannot meet the use requirement, and the design must be carried out by the related technology of the wide-band power amplifier.
The current broadband power amplifier design generally adopts the mode of segmentation power amplifier, and work respectively through a plurality of power amplifier pipes realizes at different frequency channels promptly, and such power amplifier circuit volume generally can be bigger, and circuit redundancy is high, and is fat, is unfavorable for improving the radiating efficiency, therefore adopts the single tube to carry out broadband power amplifier matching technical problem and awaits the opportune moment and solve.
Modern station communication generally needs to cover a frequency range of 30MHz-512MHz in a U/V frequency band, and the relative bandwidth is as wide as 200%, and the conventional narrow-band power amplifier design method cannot realize the wide bandwidth. When the sectional type power amplifier circuit is designed, the whole circuit needs a plurality of power amplifier tubes with different frequency bands to carry out narrow-band matching and then realizes broadband matching through combination of the radio frequency switch. The circuit realized by the method is very complex, large in size and high in cost. Therefore, the design of the broadband matching circuit by adopting the single-tube power amplifier is the engineering problem to be solved by the invention.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model aims at providing a U/V frequency channel broadband radio station power amplifier matching circuit.
According to the utility model provides a pair of U/V frequency channel broadband radio station power amplifier matching circuit, include: the power amplifier comprises a power amplifier tube V1, an input matching circuit and an output matching circuit;
the power amplifier tube V1 is a dual-channel field effect tube;
the input matching circuit comprises a balun T1, a balun T2, a balun T3, a matching resistor R1, a matching resistor R2, a matching capacitor C4, a matching capacitor C5, a matching capacitor C6, a matching capacitor C7 and a matching capacitor C8;
the unbalanced-end inner conductor of the balun T1 is a radio-frequency signal input end, the unbalanced-end outer conductor of the balun T1 is grounded, the balanced-end inner conductor of the balun T1 is connected with the unbalanced-end inner conductor of the balun T2, and the balanced-end outer conductor of the balun T1 is connected with the unbalanced-end inner conductor of the balun T3;
an unbalanced-end outer conductor of the balun T2 is connected with an unbalanced-end outer conductor of the balun T3 and then connected with a gate power supply PG, and a balanced-end inner conductor of the balun T2 is respectively connected with one end of a resistor R1, a balanced outer conductor end of the balun T3, one end of a capacitor C8 and a first gate of a power amplifier tube V1;
the balanced end inner conductor end of the balun T3 is connected with the balanced end outer conductor of the balun T2, the other end of the capacitor C8, one end of the resistor R2 and the second gate of the power amplifying tube V1,
the other end of the resistor R1 is connected with one end of a capacitor C4 and one end of a capacitor C5 respectively, the other end of the capacitor C4 is grounded, and the other end of the capacitor C5 is grounded;
the other end of the resistor R2 is connected with one end of a capacitor C6 and one end of a capacitor C7 respectively, the other end of the capacitor C6 is grounded, and the other end of the capacitor C7 is grounded;
the output matching circuit comprises a balun T4, a balun T5, a balun T6, a capacitor C13 and a capacitor C14;
the balanced end inner conductor of the balun T4 is respectively connected with one end of a capacitor C13, a first drain of the power amplification tube V1 and a balanced end outer conductor of the balun T5, and the other end of the capacitor C13 is respectively connected with the balanced end inner conductor of the balun T5, a second drain of the power amplification tube V1 and the balanced end outer conductor of the balun T4; the first source electrode and the second source electrode of the power amplification tube V1 are grounded;
the unbalanced inner conductor of the balun T4 is respectively connected with one end of a capacitor C14 and the balanced inner conductor of the balun T6, the unbalanced outer conductor of the balun T4 is connected with the unbalanced outer conductor of the balun T5 and then is connected with the drain power supply PD,
the unbalanced end inner conductor of the balun T5 is connected with the other end of the capacitor C14 and the balanced end outer conductor of the balun T6 respectively;
the inner conductor of the unbalanced terminal of the balun T6 is a radio frequency signal output terminal, and the outer conductor of the unbalanced terminal of the balun T6 is grounded.
Preferably, the dc blocking capacitor C1 is connected in series to the rf signal input end, the dc blocking capacitor C2 is connected in series between the balanced-end inner conductor of the balun T1 and the unbalanced-end inner conductor of the balun T2, and the dc blocking capacitor C3 is connected in series between the balanced-end outer conductor of the balun T1 and the unbalanced-end inner conductor of the balun T3.
Preferably, a gate voltage protection resistor R9 is connected in series to the end of the gate power supply PG.
Preferably, the circuit further comprises a negative feedback circuit, wherein the negative feedback circuit comprises a resistor R3, a resistor R4, a capacitor C9 and a capacitor C10; one end of the resistor R3 is connected with one end of a resistor R1, the other end of the resistor R3 is connected with one end of a capacitor C9, and the other end of the capacitor C9 is connected with a first drain electrode of a power amplifier tube V1; one end of the resistor R4 is connected with one end of the resistor R2, the other end of the resistor R4 is connected with one end of the capacitor C10, and the other end of the capacitor C10 is connected with the second drain of the power amplifier tube V1.
Preferably, the dc blocking capacitor C15 is connected in series to the rf signal output end, the dc blocking capacitor C11 is connected in series between the unbalanced-end inner conductor of the balun T4 and the balanced-end inner conductor of the balun T6, and the dc blocking capacitor C12 is connected in series between the unbalanced-end inner conductor of the balun T5 and the balanced-end outer conductor of the balun T6.
Preferably, a choke high-frequency inductor L1 is connected in series to the drain power supply PD terminal.
Preferably, the balun T1, the balun T2, the balun T3, the balun T4, the balun T5 and the balun T6 are all provided with ferrite magnetic rings.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a balun of adding the ferrite magnetic ring realizes the high low impedance conversion of broadband, and power amplifier input matching realizes high impedance to low impedance conversion by 4:1 balun and thereby realizes the broadband input matching, and output matching circuit adopts 1:4 balun to realize low impedance to high impedance conversion, realizes the best power matching of broadband.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a design diagram of a power amplifier matching circuit of a U/V frequency band broadband radio station;
FIG. 2 is a diagram of simulation results of input return loss of a power amplifier of a U/V band broadband radio station;
FIG. 3 is a diagram of simulation results of the return loss output by a power amplifier of a U/V band broadband radio station.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
The utility model discloses a U/V frequency channel broadband radio station power amplifier matching circuit, the purpose is solved U/V frequency channel radio station broadband power amplifier matching problem for at frequency channel 30MHz-512MHz, best input/output matching can be realized to single power amplifier, realizes best power matching at full frequency channel, makes the power amplifier performance reach the best.
Specifically, referring to fig. 1, the matching circuit includes: the power amplifier comprises a power amplifier tube V1, an input matching circuit and an output matching circuit;
wherein, the power amplifier tube V1 is a dual-channel field effect tube;
the input matching circuit comprises a balun T1, a balun T2, a balun T3, a matching resistor R1, a matching resistor R2, a matching capacitor C4, a matching capacitor C5, a matching capacitor C6, a matching capacitor C7 and a matching capacitor C8;
the unbalanced-end inner conductor of the balun T1 is a radio-frequency signal input end, the unbalanced-end outer conductor of the balun T1 is grounded, the balanced-end inner conductor of the balun T1 is connected with the unbalanced-end inner conductor of the balun T2, and the balanced-end outer conductor of the balun T1 is connected with the unbalanced-end inner conductor of the balun T3;
and an unbalanced end outer conductor of the balun T2 is connected with an unbalanced end outer conductor of the balun T3 and then connected with a grid power supply PG, and a grid voltage protection resistor R9 is connected to the end of the grid power supply PG in series. The balanced end inner conductor of the balun T2 is respectively connected with one end of a resistor R1, the balanced outer conductor end of the balun T3, one end of a capacitor C8 and the first gate of the power amplifying tube V1;
the balanced end inner conductor end of the balun T3 is connected with the balanced end outer conductor of the balun T2, the other end of the capacitor C8, one end of the resistor R2 and the second gate of the power amplifying tube V1,
the other end of the resistor R1 is connected with one end of a capacitor C4 and one end of a capacitor C5 respectively, the other end of the capacitor C4 is grounded, and the other end of the capacitor C5 is grounded;
the other end of the resistor R2 is connected with one end of a capacitor C6 and one end of a capacitor C7 respectively, the other end of the capacitor C6 is grounded, and the other end of the capacitor C7 is grounded;
the output matching circuit comprises a balun T4, a balun T5, a balun T6, a capacitor C13 and a capacitor C14;
the balanced end inner conductor of the balun T4 is respectively connected with one end of a capacitor C13, a first drain electrode of the power amplification tube V1 and a balanced end outer conductor of the balun T5, and the other end of the capacitor C13 is respectively connected with the balanced end inner conductor of the balun T5, a second drain electrode of the power amplification tube V1 and the balanced end outer conductor of the balun T4; the first source electrode and the second source electrode of the power amplification tube V1 are grounded;
the unbalanced inner conductor of the balun T4 is respectively connected with one end of a capacitor C14 and the balanced inner conductor of the balun T6, the unbalanced outer conductor of the balun T4 is connected with the unbalanced outer conductor of the balun T5 and then is connected with the drain power supply PD,
the unbalanced end inner conductor of the balun T5 is respectively connected with the other end of the capacitor C14 and the balanced end outer conductor of the balun T6;
the inner conductor of the unbalanced terminal of the balun T6 is a radio frequency signal output terminal, and the outer conductor of the unbalanced terminal of the balun T6 is grounded.
More specifically, the radio frequency signal input end is connected in series with a blocking capacitor C1, a blocking capacitor C2 is connected in series between the balanced end inner conductor of the balun T1 and the unbalanced end inner conductor of the balun T2, and a blocking capacitor C3 is connected in series between the balanced end outer conductor of the balun T1 and the unbalanced end inner conductor of the balun T3.
In the circuit, a resistor R3, a capacitor C9, a resistor R4 and a capacitor C10 respectively form a negative feedback circuit of the upper and lower stages of power amplification tubes, wherein the negative feedback circuit plays a role in enhancing the stability of the power amplifier. One end of the resistor R3 is connected with one end of a resistor R1, the other end of the resistor R3 is connected with one end of a capacitor C9, and the other end of the capacitor C9 is connected with a first drain electrode of a power amplifier tube V1; one end of the resistor R4 is connected with one end of the resistor R2, the other end of the resistor R4 is connected with one end of the capacitor C10, and the other end of the capacitor C10 is connected with the second drain of the power amplifier tube V1.
The radio-frequency signal output end is connected with a blocking capacitor C15 in series, a blocking capacitor C11 is connected between an inner conductor at the unbalanced end of the balun T4 and an inner conductor at the balanced end of the balun T6 in series, and a blocking capacitor C12 is connected between an inner conductor at the unbalanced end of the balun T5 and an outer conductor at the balanced end of the balun T6 in series. A choke high-frequency inductor L1 is connected in series to the drain power PD terminal to prevent rf signals from being transmitted to the power terminal.
The utility model discloses well resistance R1, resistance R2 are all 20 ohms, and electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7 are 1000pf, and electric capacity C8 is 10 pf. The utility model provides an electric capacity C1, electric capacity C2, C3 are blocking electric capacity, do not play the mating reaction. The resistor R9 is a grid voltage protection resistor and does not play a matching role. The balun T4, the balun T5 and the balun T6 are all provided with ferrite magnetic rings bearing high power so as to expand the matching characteristic of low frequency bands. Capacitor C14 is a matching capacitor that trims the matching impedance, which in this example is 10 pf. The capacitor C11, the capacitor C12 and the capacitor C15 are all blocking capacitors and do not play a matching role.
The utility model provides an output matching circuit realizes impedance transformation from small to big by transmission line balun T4, balun T5, and the transform relation is 1:4, after transformation, the impedance is trimmed by a matching capacitor C14 and then converted into a single-ended output through a balun T6 double-end.
Fig. 2 is a simulation diagram of the input matching result of the present invention. The abscissa is frequency, unit GHz and the ordinate is return loss S11, and it can be seen from the figure that the input return loss S11 is less than or equal to-20 dB in the frequency band of 38M-512 MHz. FIG. 3 is a simulation diagram of the output matching result of the present invention, which shows that the interpolation output return loss S22 is less than or equal to-15 dB in the frequency band of 38M-512 MHz. The result shows that the input and output matching method of the power amplifier can well realize the broadband matching of the U/V frequency band and better meet the engineering application.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims (7)

1. A power amplifier matching circuit of a U/V frequency band broadband radio station is characterized by comprising: the power amplifier comprises a power amplifier tube V1, an input matching circuit and an output matching circuit;
the power amplifier tube V1 is a dual-channel field effect tube;
the input matching circuit comprises a balun T1, a balun T2, a balun T3, a matching resistor R1, a matching resistor R2, a matching capacitor C4, a matching capacitor C5, a matching capacitor C6, a matching capacitor C7 and a matching capacitor C8;
the unbalanced-end inner conductor of the balun T1 is a radio-frequency signal input end, the unbalanced-end outer conductor of the balun T1 is grounded, the balanced-end inner conductor of the balun T1 is connected with the unbalanced-end inner conductor of the balun T2, and the balanced-end outer conductor of the balun T1 is connected with the unbalanced-end inner conductor of the balun T3;
an unbalanced-end outer conductor of the balun T2 is connected with an unbalanced-end outer conductor of the balun T3 and then connected with a gate power supply PG, and a balanced-end inner conductor of the balun T2 is respectively connected with one end of a resistor R1, a balanced outer conductor end of the balun T3, one end of a capacitor C8 and a first gate of a power amplifier tube V1;
the balanced end inner conductor end of the balun T3 is connected with the balanced end outer conductor of the balun T2, the other end of the capacitor C8, one end of the resistor R2 and the second gate of the power amplifying tube V1,
the other end of the resistor R1 is connected with one end of a capacitor C4 and one end of a capacitor C5 respectively, the other end of the capacitor C4 is grounded, and the other end of the capacitor C5 is grounded;
the other end of the resistor R2 is connected with one end of a capacitor C6 and one end of a capacitor C7 respectively, the other end of the capacitor C6 is grounded, and the other end of the capacitor C7 is grounded;
the output matching circuit comprises a balun T4, a balun T5, a balun T6, a capacitor C13 and a capacitor C14;
the balanced end inner conductor of the balun T4 is respectively connected with one end of a capacitor C13, a first drain electrode of the power amplification tube V1 and a balanced end outer conductor of the balun T5, and the other end of the capacitor C13 is respectively connected with the balanced end inner conductor of the balun T5, a second drain electrode of the power amplification tube V1 and the balanced end outer conductor of the balun T4; the first source electrode and the second source electrode of the power amplification tube V1 are grounded;
the unbalanced inner conductor of the balun T4 is respectively connected with one end of a capacitor C14 and the balanced inner conductor of the balun T6, the unbalanced outer conductor of the balun T4 is connected with the unbalanced outer conductor of the balun T5 and then is connected with the drain power supply PD,
the unbalanced end inner conductor of the balun T5 is respectively connected with the other end of the capacitor C14 and the balanced end outer conductor of the balun T6;
the inner conductor of the unbalanced terminal of the balun T6 is a radio frequency signal output terminal, and the outer conductor of the unbalanced terminal of the balun T6 is grounded.
2. The U/V band broadband station power amplifier matching circuit of claim 1, wherein: the radio frequency signal input end is connected in series with a blocking capacitor C1, a blocking capacitor C2 is connected in series between the balanced end inner conductor of the balun T1 and the unbalanced end inner conductor of the balun T2, and a blocking capacitor C3 is connected in series between the balanced end outer conductor of the balun T1 and the unbalanced end inner conductor of the balun T3.
3. The U/V band broadband station power amplifier matching circuit of claim 1, wherein: a grid voltage protection resistor R9 is connected in series with the end of the grid power supply PG.
4. The matching circuit of the U/V band broadband radio station power amplifier of claim 1, further comprising a negative feedback circuit, wherein the negative feedback circuit comprises a resistor R3, a resistor R4, a capacitor C9 and a capacitor C10; one end of the resistor R3 is connected with one end of a resistor R1, the other end of the resistor R3 is connected with one end of a capacitor C9, and the other end of the capacitor C9 is connected with a first drain electrode of a power amplifier tube V1; one end of the resistor R4 is connected with one end of the resistor R2, the other end of the resistor R4 is connected with one end of the capacitor C10, and the other end of the capacitor C10 is connected with the second drain of the power amplifier tube V1.
5. The U/V band broadband station power amplifier matching circuit of claim 1, wherein: the radio-frequency signal output end is connected with a blocking capacitor C15 in series, a blocking capacitor C11 is connected between an inner conductor at the unbalanced end of the balun T4 and an inner conductor at the balanced end of the balun T6 in series, and a blocking capacitor C12 is connected between an inner conductor at the unbalanced end of the balun T5 and an outer conductor at the balanced end of the balun T6 in series.
6. The U/V band broadband station power amplifier matching circuit of claim 1, wherein: and a choke high-frequency inductor L1 is connected in series to the end of the drain power supply PD.
7. The U/V band broadband station power amplifier matching circuit of claim 1, wherein: and ferrite magnetic rings are arranged on the balun T1, the balun T2, the balun T3, the balun T4, the balun T5 and the balun T6.
CN202123270687.5U 2021-12-23 2021-12-23 Power amplifier matching circuit of U/V frequency band broadband radio station Active CN217159655U (en)

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CN202123270687.5U CN217159655U (en) 2021-12-23 2021-12-23 Power amplifier matching circuit of U/V frequency band broadband radio station

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Application Number Priority Date Filing Date Title
CN202123270687.5U CN217159655U (en) 2021-12-23 2021-12-23 Power amplifier matching circuit of U/V frequency band broadband radio station

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