WO2023020098A1 - 一种适用于巴伦的谐波抑制匹配电路结构及功率放大器 - Google Patents

一种适用于巴伦的谐波抑制匹配电路结构及功率放大器 Download PDF

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WO2023020098A1
WO2023020098A1 PCT/CN2022/099451 CN2022099451W WO2023020098A1 WO 2023020098 A1 WO2023020098 A1 WO 2023020098A1 CN 2022099451 W CN2022099451 W CN 2022099451W WO 2023020098 A1 WO2023020098 A1 WO 2023020098A1
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balun
tuning unit
signal port
ground terminal
coupling coil
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PCT/CN2022/099451
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English (en)
French (fr)
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赵罡
龙华
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深圳飞骧科技股份有限公司
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Publication of WO2023020098A1 publication Critical patent/WO2023020098A1/zh

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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
    • H03F1/56—Modifications of input or output impedances, not otherwise provided for
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • H03F3/195—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
    • 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
    • H03F3/213—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits

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  • the present application relates to the technical field of power amplification, in particular to a harmonic suppression matching circuit structure and a power amplifier suitable for a balun.
  • a balun (English balun) is a three-port device, or a broadband radio frequency transmission line transformer that realizes the connection between a balanced transmission line circuit and an unbalanced transmission line circuit by converting a matched input into a differential output.
  • the function of the balun is to make the system have different impedance or compatible with differential/single-ended signaling, and it is used in modern communication systems such as mobile phones and data transmission networks.
  • 5G NR a global 5G standard based on a new OFDM air interface design
  • 5G technology will achieve ultra-low latency and high reliability.
  • the main advantage of 5G networks is that the data transfer rate is much higher than previous cellular networks, up to 10Gbit/s, which is faster than current wired Internet and 100 times faster than previous 4G LTE cellular networks.
  • Another advantage is lower network latency (faster response time), below 1 millisecond compared to 30-70 milliseconds for 4G.
  • the push-pull RF amplifier structure is more and more used in the design of 5G-NR RF power amplifiers because of its high linear power.
  • the balun is designed at the output port of the push-pull RF amplifier, which has impedance matching and harmonic suppression. And so on, it plays a key role in the performance of the whole module.
  • the 5G-NR RF front-end module has high transmit power, the high-order harmonics generated are also synchronously larger, and the traditional balun does not have good harmonic suppression capabilities.
  • An embodiment of the present application provides a harmonic suppression matching circuit structure suitable for a balun, including a balun, a first tuning unit, a second tuning unit, and a third tuning unit.
  • the balun includes a main coupling coil, a first secondary A coupling coil and a second secondary coupling coil, the main coupling coil is connected between the unbalanced signal port and the ground terminal, one end of the first secondary coupling coil is connected to the first balanced signal port, and the second secondary coupling coil One end is connected to the second balanced signal port, and the connection point between the first secondary coupling coil and the second secondary coupling coil is connected to the ground terminal;
  • the first tuning unit is connected between the first balanced signal port and the ground terminal Between; the second tuning unit is connected between the unbalanced signal port and the ground terminal; the third tuning unit is connected between the second balanced signal port and the ground terminal.
  • the first tuning unit includes a first capacitor connected between the first balanced signal port and the ground terminal.
  • the first tuning unit further includes a first inductor, and the first inductor and the first capacitor are connected in series between the first balanced signal port and the ground terminal.
  • the first capacitor and the first inductor resonate at a second harmonic frequency.
  • the second tuning unit includes a second capacitor connected between the unbalanced signal port and the ground terminal.
  • the second tuning unit further includes a second inductor, and the second inductor and the second capacitor are connected in series between the unbalanced signal port and the ground terminal.
  • the second capacitor and the second inductor resonate at a third harmonic frequency.
  • the third tuning unit includes a third capacitor connected between the second balanced signal port and the ground terminal.
  • the third tuning unit further includes a third inductor, and the third inductor and the third capacitor are connected in series between the second balanced signal port and the ground terminal.
  • the third capacitor and the third inductor resonate at a second harmonic frequency.
  • the working frequency band of the balun is adjusted by tuning the first capacitance of the first tuning unit, the second capacitance of the second tuning unit, and the third capacitance of the third tuning unit.
  • An embodiment of the present application also provides a power amplifier, including the harmonic suppression matching circuit structure suitable for a balun as described above.
  • the technical solution provided by the embodiment of the present application proposes a harmonic suppression matching circuit structure suitable for the balun. Using this structure can effectively improve the balun's high-order harmonics under the premise of maintaining a good balance of the balun. The ability to suppress, so as to meet the system requirements of 5G-NR, and can maintain a good balance of the balun.
  • FIG. 1 is a schematic structural diagram of a balun matching circuit in the prior art.
  • FIG. 2 is a schematic diagram of the Balun balance of the structure in FIG. 1 .
  • FIG. 3 is a schematic diagram of the harmonic suppression capability of the structure in FIG. 1 .
  • FIG. 4 is a schematic structural diagram of a harmonic suppression matching circuit suitable for a balun according to an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of another harmonic suppression matching circuit suitable for a balun according to an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of another harmonic suppression matching circuit suitable for a balun according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of the Balun balance of the structure in FIG. 6 .
  • FIG. 8 is a schematic diagram of the harmonic suppression capability of the structure in FIG. 6 .
  • FIG. 1 is a schematic structural diagram of a balun matching circuit in the prior art.
  • port 1 is an unbalanced port, and ports 2 and 3 are balanced ports.
  • the capacitor C1 between the balanced ends and the capacitor C2 between the unbalanced ends play a tuning role, so that the balun works in different frequency bands.
  • the balun Xfer1 is composed of three inductors, which are the main coil inductor N1, and the additional coil inductors N2 and N3. In order to make the balance ends differ by 180°, the center ports of N1 and N2 coils are grounded.
  • phase(S2,1) represents the phase from the first balanced terminal to the unbalanced terminal
  • phase(S3,1) represents the phase from the second balanced terminal to the unbalanced terminal.
  • the frequency is 2.5GHz
  • the phase from the first balanced end to the unbalanced end is 51.048°
  • the phase from the second balanced end to the unbalanced end is 128.952°.
  • balun balance is, two balanced outputs (one is an inverting 180° output and the other is a non-inverting output) and the ideal state of "equal power level, 180° phase difference" the degree of proximity.
  • the degree to which the phase angle difference between the two outputs deviates from 180° is called the phase imbalance of the balun.
  • the quality of the balun balance directly affects the performance of the RF power amplifier. It can be seen that the balance of the balun is good, and the difference between the two balanced ports is 180°.
  • the frequency response of the balun is shown in Figure 3.
  • the abscissa is the frequency in GHz, and the ordinate is the insertion loss, dB(S2,1), which represents the insertion loss from the first balanced end to the unbalanced end.
  • dB(S3,1) represents the insertion loss from the second balanced end to the unbalanced end.
  • the frequency is 2.5GHz
  • the insertion loss from the first balanced end to the unbalanced end is -3.010dB
  • the insertion loss from the second balanced end to the unbalanced end is -3.010dB.
  • the frequency is 5GHz
  • the insertion loss from the first balanced end to the unbalanced end is -10.511dB
  • the insertion loss from the second balanced end to the unbalanced end is -10.511dB.
  • the frequency is 7.5GHz
  • the insertion loss from the first balanced end to the unbalanced end is -21.811dB
  • the insertion loss from the second balanced end to the unbalanced end is -21.811dB.
  • the insertion loss from the balanced terminal to the unbalanced terminal is -3dB
  • the second-order harmonic suppression capability is -10dB
  • the third-order harmonic suppression capability is -21dB.
  • FIG. 4 is a schematic structural diagram of a harmonic suppression matching circuit suitable for a balun according to an embodiment of the present application.
  • the circuit structure includes a balun 1 , a first tuning unit 2 , a second tuning unit 3 and a third tuning unit 4 .
  • the balun 1 includes a primary coupling coil N1, a first secondary coupling coil N2 and a second secondary coupling coil N3.
  • the main coupling coil N1 is connected between the unbalanced signal port T1 and the ground.
  • One end of the first secondary coupling coil N2 is connected to the first balanced signal port T2.
  • One end of the second secondary coupling coil N3 is connected to the second balanced signal port T3.
  • the connection point between the first secondary coupling coil N2 and the second secondary coupling coil N3 is connected to the ground terminal.
  • the first tuning unit 2 is connected between the first balanced signal port T2 and the ground terminal.
  • the second tuning unit 3 is connected between the unbalanced signal port T1 and the ground.
  • the third tuning unit 4 is connected between the second balanced signal port T3 and the ground terminal.
  • the first tuning unit 2 includes a first capacitor C1, and the first capacitor C1 is connected between the first balanced signal port T2 and the ground terminal.
  • the third tuning unit 4 includes a third capacitor C3, and the third capacitor C3 is connected between the second balanced signal port and the ground terminal.
  • the second tuning unit 3 includes a second capacitor C2 and a second inductor L2, and the second inductor L2 and the second capacitor C2 are connected in series between the unbalanced signal port T1 and the ground terminal.
  • the second capacitor C2 and the second inductor L2 resonate at the third-order harmonic frequency, which can improve the ability to suppress the third-order harmonic.
  • the first tuning unit 2 includes a first capacitor C1 and a first inductor.
  • the first inductor L1 and the first capacitor C1 are connected in series between the first balanced signal port T2 and the ground terminal.
  • the first capacitor C1 and the first inductor L1 resonate at the second harmonic frequency.
  • the third tuning unit 4 includes a third capacitor C3 and a third inductor L3.
  • the third inductor L3 and the third capacitor C3 are connected in series between the second balanced signal port T3 and the ground terminal.
  • the third capacitor C3 and the third inductor L3 resonate at the second harmonic frequency.
  • the second tuning unit 3 includes a second capacitor C2, and the second capacitor C2 is connected between the unbalanced signal port T1 and the ground terminal, as shown in FIG. 5 , which can improve the second harmonic suppression capability.
  • the first tuning unit 2 includes a first capacitor C1 and a first inductor.
  • the first inductor L1 and the first capacitor C1 are connected in series between the first balanced signal port T2 and the ground terminal.
  • the first capacitor C1 and the first inductor L1 resonate at the second harmonic frequency.
  • the third tuning unit 4 includes a third capacitor C3 and a third inductor L3.
  • the third inductor L3 and the third capacitor C3 are connected in series between the second balanced signal port T3 and the ground terminal.
  • the third capacitor C3 and the third inductor L3 resonate at the second harmonic frequency.
  • the second tuning unit 3 includes a second capacitor C2 and a second inductor L2, and the second inductor L2 and the second capacitor C2 are connected in series between the unbalanced signal port T1 and the ground terminal.
  • the second capacitor C2 and the second inductor L2 resonate at the third harmonic frequency, as shown in FIG. 6 .
  • the working frequency band of the balun 1 is adjusted.
  • phase(S2,1) represents the phase from the first balanced end to the unbalanced end, and the curve shown in the figure is 10
  • phase(S3,1) represents the phase from the second balanced end to the unbalanced end, as shown in the figure The curve is 20.
  • the frequency is 2.5GHz
  • the phase phase (S2,1) from the first balanced end to the unbalanced end is -44.116°
  • the phase phase (S3,1) from the second balanced end to the unbalanced end is 135.884°.
  • the frequency response of the balun is shown in Figure 8.
  • the abscissa is the frequency in GHz, and the ordinate is the insertion loss, dB(S2,1), which represents the insertion loss from the first balanced end to the unbalanced end.
  • dB(S3,1) represents the insertion loss from the second balanced end to the unbalanced end.
  • the frequency is 2.5GHz
  • the insertion loss from the first balanced end to the unbalanced end is -3.042dB
  • the insertion loss from the second balanced end to the unbalanced end is -3.042dB.
  • the frequency is 5GHz
  • the insertion loss from the first balanced end to the unbalanced end is -44.927dB
  • the insertion loss from the second balanced end to the unbalanced end is -44.927dB.
  • the frequency is 7.5GHz
  • the insertion loss from the first balanced end to the unbalanced end is -63.381dB
  • the insertion loss from the second balanced end to the unbalanced end is -63.381dB.
  • the insertion loss from the balanced terminal to the unbalanced terminal is -3dB
  • the second-order harmonic suppression capability is -45dB
  • the third-order harmonic suppression capability is -63dB.
  • the embodiment of the present application also provides a power amplifier, including the above-mentioned harmonic suppression matching circuit structure suitable for a balun.

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Abstract

一种适用于巴伦的谐波抑制匹配电路结构及功率放大器。电路结构包括巴伦(1)、第一调谐单元(2)、第二调谐单元(3)和第三调谐单元(4)，巴伦(1)包括主耦合线圈(N1)、第一副耦合线圈(N2)和第二副耦合线圈(N3)，主耦合线圈(N1)连接在非平衡信号端口(T1)与接地端之间，第一副耦合线圈(N2)的一端连接第一平衡信号端口(T2)，第二副耦合线圈(N3)的一端连接第二平衡信号端口(T3)，第一副耦合线圈(N2)和第二副耦合线圈(N3)的连接点连接接地端；第一调谐单元(2)连接在第一平衡信号端口(T2)与接地端之间；第二调谐单元(3)连接在非平衡信号端口(T1)和接地端之间；第三调谐单元(4)连接在第二平衡信号端口(T3)与接地端之间。在保持巴伦良好的平衡性前提下，可有效提高巴伦高次谐波的抑制能力，达到5G-NR系统要求。

Description

一种适用于巴伦的谐波抑制匹配电路结构及功率放大器 技术领域
本申请涉及功率放大技术领域，具体涉及一种适用于巴伦的谐波抑制匹配电路结构及功率放大器。
背景技术
巴伦(英语为balun)为一种三端口器件，或者说是一种通过将匹配输入转换为差分输出而实现平衡传输线电路与不平衡传输线电路之间的连接的宽带射频传输线变压器。巴伦的功能在于使系统具有不同阻抗或与差分/单端信令兼容，并且用于手机和数据传输网络等现代通信系统。
5GNR，基于OFDM的全新空口设计的全球性5G标准，也是下一代非常重要的蜂窝移动技术基础，5G技术将实现超低时延、高可靠性。5G网络的主要优势在于，数据传输速率远远高于以前的蜂窝网络，最高可达10Gbit/s，比当前的有线互联网要快，比先前的4G LTE蜂窝网络快100倍。另一个优点是较低的网络延迟(更快的响应时间)，低于1毫秒，而4G为30-70毫秒。
为了实现如此高的数据传输速率，对于射频前端模组中功率放大器提出了更加高的线性度要求。推挽射频放大器结构因为其具备较高的线性功率被越来越多的应用于5G-NR射频功率放大器设计中，巴伦被设计在推挽射频放大器的输出端口，具有阻抗匹配以及谐波抑制等作用，对整个模块的性能起到了关键作用。
5G-NR射频前端模块因为其具备较高的发射功率，所以产生的高次谐波也同步变大，传统巴伦并不具备良好的谐波抑制能力。
实用新型内容
本申请实施例提供一种适用于巴伦的谐波抑制匹配电路结构，包括巴伦、第一调谐单元和第二调谐单元和第三调谐单元，所述巴伦包括主耦合线圈、第一副耦合线圈和第二副耦合线圈，所述主耦合线圈连接在非平衡信号端口与接地端之间，所述第一副耦合线圈的一端连接第一平衡信号端口，所述第二副耦合线圈的一端连接第二平衡信号端口，所述第一副耦合线圈和所述第二副耦合线圈的连接点连接接地端；所述第一调谐单元连接在所述第一平衡信号端口与所述接地端之间；所述第二调谐单元连接在所述非平衡信号端口和所述接地端之间；所述第三调谐单元连接在所述第二平衡信号端口与所述接地端之间。
根据一些实施例，所述第一调谐单元包括第一电容，所述第一电容连接在所述第一平衡信号端口和所述接地端之间。
根据一些实施例，所述第一调谐单元还包括第一电感，所述第一电感与所述第一电容串联连接在所述第一平衡信号端口和所述接地端之间。
根据一些实施例，所述第一电容和所述第一电感共振在二阶谐波频率。
根据一些实施例，所述第二调谐单元包括第二电容，所述第二电容连接在所述非平衡信号端口和所述接地端之间。
根据一些实施例，所述第二调谐单元还包括第二电感，所述第二电感与所述第二电容串联连接在所述非平衡信号端口和所述接地端之间。
根据一些实施例，所述第二电容和所述第二电感共振在三阶谐波频率。
根据一些实施例，所述第三调谐单元包括第三电容，所述第三电容连接在所述第二平衡信号端口和所述接地端之间。
根据一些实施例，所述第三调谐单元还包括第三电感，所述第三电感与所述第三电容串联连接在所述第二平衡信号端口和所述接地端之间。
根据一些实施例，所述第三电容和所述第三电感共振在二阶谐波频率。
根据一些实施例，通过调谐所述第一调谐单元的第一电容、所述第二调谐单元的第二电容和所述第三调谐单元的第三电容，调节所述巴伦的工作频段。
本申请实施例还提供一种功率放大器，包括如上所述的适用于巴伦的谐波抑制匹配电路结构。
本申请实施例提供的技术方案，提出了一种适用于巴伦的谐波抑制匹配电路结构，采用此架构可以在保持巴伦良好的平衡性的前提下，有效提高巴伦高次谐波的抑制能力，从而达到5G-NR的系统要求，并且能够保持巴伦良好的平衡性。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是现有技术的一种巴伦匹配电路结构示意图。
图2是图1结构的巴伦平衡性示意图。
图3是图1结构的谐波抑制能力示意图。
图4是本申请实施例的一种适用于巴伦的谐波抑制匹配电路结构示意图。
图5是本申请实施例的另一种适用于巴伦的谐波抑制匹配电路结构示意图。
图6是本申请实施例的又一种适用于巴伦的谐波抑制匹配电路结构示意图。
图7是图6结构的巴伦平衡性示意图。
图8是图6结构的谐波抑制能力示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
应当理解，本申请的说明书和权利要求书中使用的术语“包括”和“包含”指示所描述特征、整体、步骤、操作、元素和/或组件的存在，但并不排除一个或多个其它特征、整体、步骤、操作、元素、组件和/或其集合的存在或添加。
图1是现有技术的一种巴伦匹配电路结构示意图。
如图1所示，端口1是非平衡端，端口2和端口3是平衡端。平衡端之间的电容C1和非平衡端的电容C2起调谐作用，使巴伦工作在不同的频段内。巴伦Xfer1由三个电感组成，分别是主线圈电感N1，附线圈电感N2，N3。为了使平衡端相差180°，N1与N2线圈的中心端口接地。
设计一个2.5GHz的巴伦结构，如图2所示。
如图2所示，横坐标是频率，单位是GHz，纵坐标是两个平衡端到非平衡端的相位。phase(S2,1),代表第一平衡端到非平 衡端的相位，phase(S3,1),代表第二平衡端到非平衡端的相位。
在m4点，频率为2.5GHz，第一平衡端到非平衡端的相位为51.048°，第二平衡端到非平衡端的相位为128.952°。
巴伦的一项重要标准指标为其平衡性，即两个平衡输出(一个为反相180°输出，另一个为非反相输出)与“功率水平相等，相位相差180°”这一理想状态的接近程度。两个输出之间的相位角度差与180°的偏离程度称为巴伦的相位不平衡度。巴伦平衡性的好坏直接影响射频功率放大器的性能。可以看到巴伦的平衡性良好，两个平衡端口相差180°。
巴伦的频率响应如图3所示，横坐标是频率，单位是GHz，纵坐标是插损，dB(S2,1),代表第一平衡端到非平衡端的插损。dB(S3,1),代表第二平衡端到非平衡端的插损。
在m1点，频率为2.5GHz，第一平衡端到非平衡端的插损为-3.010dB，第二平衡端到非平衡端的插损为-3.010dB。在m2点，频率为5GHz，第一平衡端到非平衡端的插损为-10.511dB，第二平衡端到非平衡端的插损为-10.511dB。在m3点，频率为7.5GHz，第一平衡端到非平衡端的插损为-21.811dB，第二平衡端到非平衡端的插损为-21.811dB。
平衡端到非平衡端的插损为-3dB，二阶谐波抑制能力为-10dB，三阶谐波抑制能力为-21dB。
图4是本申请实施例的一种适用于巴伦的谐波抑制匹配电路结构示意图。
电路结构包括巴伦1、第一调谐单元2、第二调谐单元3和第三调谐单元4。
巴伦1包括主耦合线圈N1、第一副耦合线圈N2和第二副耦合线圈 N3。主耦合线圈N1连接在非平衡信号端口T1与接地端之间。第一副耦合线圈N2的一端连接第一平衡信号端口T2。第二副耦合线圈N3的一端连接第二平衡信号端口T3。第一副耦合线圈N2和第二副耦合线圈N3的连接点连接接地端。第一调谐单元2连接在第一平衡信号端口T2与接地端之间。第二调谐单元3连接在非平衡信号端口T1和接地端之间。第三调谐单元4连接在第二平衡信号端口T3与接地端之间。
第一调谐单元2包括第一电容C1，第一电容C1连接在第一平衡信号端口T2和接地端之间。第三调谐单元4包括第三电容C3，第三电容C3连接在第二平衡信号端口和接地端之间。第二调谐单元3包括第二电容C2和第二电感L2，第二电感L2与第二电容C2串联连接在非平衡信号端口T1和接地端之间。第二电容C2和第二电感L2共振在三阶谐波频率，可以提高三次谐波抑制能力。
根据一些实施例，第一调谐单元2包括第一电容C1和第一电感。第一电感L1与第一电容C1串联连接在第一平衡信号端口T2和接地端之间。第一电容C1和第一电感L1共振在二阶谐波频率。第三调谐单元4包括第三电容C3和第三电感L3。第三电感L3与第三电容C3串联连接在第二平衡信号端口T3和接地端之间。第三电容C3和第三电感L3共振在二阶谐波频率。第二调谐单元3包括第二电容C2，第二电容C2连接在非平衡信号端口T1和接地端之间，如图5所示，可以提高二次谐波抑制能力。
根据一些实施例，第一调谐单元2包括第一电容C1和第一电感。第一电感L1与第一电容C1串联连接在第一平衡信号端口T2和接地端之间。第一电容C1和第一电感L1共振在二阶谐波频率。第三调谐单元4包括第三电容C3和第三电感L3。第三电感L3与第三电容C3串联连接在第二平衡信号端口T3和接地端之间。第三电容C3和第三电感L3共振在二阶谐波频率。第二调谐单元3包括第二电容C2和第二电感L2，第二电感L2与第二电容C2串联连接在非平衡信号端口T1和接地端之间。第二电容C2和第二电感L2共振在三阶谐波频率，如图6所示。
通过调谐第一调谐单元2的第一电容C1、第二调谐单元3的第二电 容C2和第三调谐单元4的第三电容C3，调节巴伦1的工作频段。
设计一个如图6所示的2.5GHz的巴伦结构，巴伦平衡性如图7所示。
如图7所示，横坐标是频率，单位是GHz，纵坐标是两个平衡端到非平衡端的相位。phase(S2,1),代表第一平衡端到非平衡端的相位，体现在图中的曲线为10，phase(S3,1),代表第二平衡端到非平衡端的相位，体现在图中的曲线为20。
在m1点，频率为2.5GHz，第一平衡端到非平衡端的相位phase(S2,1)为-44.116°，第二平衡端到非平衡端的相位phase(S3,1)为135.884°。
可以看到巴伦的平衡性良好，两个平衡端口相差180°。
巴伦的频率响应如图8所示，横坐标是频率，单位是GHz，纵坐标是插损，dB(S2,1),代表第一平衡端到非平衡端的插损。dB(S3,1),代表第二平衡端到非平衡端的插损。
在m2点，频率为2.5GHz，第一平衡端到非平衡端的插损为-3.042dB，第二平衡端到非平衡端的插损为-3.042dB。在m3点，频率为5GHz，第一平衡端到非平衡端的插损为-44.927dB，第二平衡端到非平衡端的插损为-44.927dB。在m4点，频率为7.5GHz，第一平衡端到非平衡端的插损为-63.381dB，第二平衡端到非平衡端的插损为-63.381dB。
可见，本实施例中，平衡端到非平衡端的插损为-3dB，二阶谐波抑制能力为-45dB，三阶谐波抑制能力为-63dB。较现有技术的巴伦，在不牺牲插损和平衡性的情况下大大增强了巴伦谐波抑制能力。
本申请实施例还提供一种功率放大器，包括如上所述的适用于巴伦 的谐波抑制匹配电路结构。
以上实施例仅为说明本申请的技术思想，不能以此限定本申请的保护范围，凡是按照本申请提出的技术思想，在技术方案基础上所做的任何改动，均落入本申请保护范围之内。

Claims (12)

  1. 一种适用于巴伦的谐波抑制匹配电路结构，其特征在于，包括：
    巴伦，包括主耦合线圈、第一副耦合线圈和第二副耦合线圈，所述主耦合线圈连接在非平衡信号端口与接地端之间，所述第一副耦合线圈的一端连接第一平衡信号端口，所述第二副耦合线圈的一端连接第二平衡信号端口，所述第一副耦合线圈和所述第二副耦合线圈的连接点连接接地端；
    第一调谐单元，连接在所述第一平衡信号端口与所述接地端之间；
    第二调谐单元，连接在所述非平衡信号端口和所述接地端之间；
    第三调谐单元，连接在所述第二平衡信号端口与所述接地端之间。
  2. 如权利要求1所述的电路结构，其特征在于，所述第一调谐单元包括：
    第一电容，连接在所述第一平衡信号端口和所述接地端之间。
  3. 如权利要求2所述的电路结构，其特征在于，所述第一调谐单元还包括：
    第一电感，与所述第一电容串联连接在所述第一平衡信号端口和所述接地端之间。
  4. 如权利要求3所述的电路结构，其特征在于，所述第一电容和所述第一电感共振在二阶谐波频率。
  5. 如权利要求1所述的电路结构，其特征在于，所述第二调谐单元 包括：
    第二电容，连接在所述非平衡信号端口和所述接地端之间。
  6. 如权利要求5所述的电路结构，其特征在于，所述第二调谐单元还包括：
    第二电感，与所述第二电容串联连接在所述非平衡信号端口和所述接地端之间。
  7. 如权利要求6所述的电路结构，其特征在于，所述第二电容和所述第二电感共振在三阶谐波频率。
  8. 如权利要求1所述的电路结构，其特征在于，所述第三调谐单元包括：
    第三电容，连接在所述第二平衡信号端口和所述接地端之间。
  9. 如权利要求8所述的电路结构，其特征在于，所述第三调谐单元还包括：
    第三电感，与所述第三电容串联连接在所述第二平衡信号端口和所述接地端之间。
  10. 如权利要求9所述的电路结构，其特征在于，所述第三电容和所述第三电感共振在二阶谐波频率。
  11. 如权利要求1所述的电路结构，其特征在于，所述第一调谐单 元的第一电容、所述第二调谐单元的第二电容和所述第三调谐单元的第三电容，用于调节所述巴伦的工作频段。
  12. 一种功率放大器，其特征在于，包括如权利要求1至11之任一项所述的适用于巴伦的谐波抑制匹配电路结构。
PCT/CN2022/099451 2021-08-19 2022-06-17 一种适用于巴伦的谐波抑制匹配电路结构及功率放大器 WO2023020098A1 (zh)

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