Doherty power amplifier circuit and power amplifier

Abstract

The present invention discloses a Doherty power amplifier circuit and a power amplifier. The Doherty power amplifier circuit includes: a carrier tube amplification path, the carrier tube amplification path including a carrier input matching module, a carrier amplifier, and a carrier output matching module connected in series; the phase shift value of the carrier tube amplification path is n*90 degrees, and the phase shift value of the carrier output matching module is n*90 degrees, where 1≤n≤3, and n is an integer; at least two peak tube amplification paths, the phase shift value of the peak tube amplification path is (n*90+k*360) degrees, where k≥1, and k is an integer. The embodiments of the present invention can reduce the insertion loss of the power amplifier, increase the current carrying capacity, and improve the reliability.

Description

Technical Field

[0001] The embodiments of the present invention relate to power amplification technology, and in particular to a Doherty power amplifier circuit and a power amplifier. Background Art

[0002] Doherty power amplifiers are capable of maintaining high efficiency operation within a large back-off range and have important applications in modern mobile communications.

[0003] However, in traditional Doherty power amplifiers, the insertion loss from the carrier amplifier output to the load is high, and the back-off efficiency of the power amplifier is mainly determined by the back-off efficiency of the carrier amplifier. Therefore, existing power amplifiers have high losses, small current carrying capacity, and poor reliability. Summary of the Invention

[0004] The present invention provides a Doherty power amplifier circuit and a power amplifier, so as to reduce the insertion loss of the power amplifier, increase the current carrying capacity and improve the reliability.

[0005] In a first aspect, an embodiment of the present invention provides a Doherty power amplifier circuit, comprising: a carrier tube amplification path, the carrier tube amplification path comprising a carrier input matching module, a carrier amplifier, and a carrier output matching module connected in series in sequence; a phase shift value of the carrier tube amplification path is n*90 degrees, and a phase shift value of the carrier output matching module is n*90 degrees, where 1≤n≤3 and n is an integer; and at least two peak tube amplification paths, the phase shift value of the peak tube amplification path being (n*90+k*360) degrees, where k≥1 and k is an integer.

[0006] Optionally, the phase shift value of the carrier output matching module is 90 degrees.

[0007] Optionally, the at least two peak tube amplification paths include a first peak tube amplification path and a second peak tube amplification path, the first peak tube amplification path includes a first peak input matching module, a first peak amplifier and a first peak output matching module, the second peak tube amplification path includes a second peak input matching module, a second peak amplifier and a second peak output matching module, and the phase shift value of the first peak output matching module is smaller than the phase shift value of the second peak output matching module.

[0008] Optionally, the phase shift value of the peak tube amplification path is 450 degrees.

[0009] Optionally, the Doherty power amplifier circuit further includes:

[0010] a first main power divider, wherein an input end of the first main power divider is electrically connected to an input end of the Doherty power amplifier circuit, and the carrier input matching module, the carrier amplifier, and the carrier output matching module are sequentially connected in series between a first output end of the first main power divider and an output end of the Doherty power amplifier circuit;

[0011] The at least two peak tube amplification paths further include: a first impedance converter, a first peak power divider, a second impedance converter, and a third impedance converter;

[0012] The first end of the first impedance converter is electrically connected to the second output end of the first main power divider, the second end of the first impedance converter is electrically connected to the input end of the first peak power divider, and the phase shift value of the first impedance converter is 180 degrees;

[0013] The second impedance converter, the first peak input matching module, the first peak amplifier, and the first peak output matching module are sequentially connected in series between the first output end of the first peak power divider and the first end of the third impedance converter, wherein the phase shift value of the second impedance converter is 90 degrees, the phase shift value of the first peak output matching module is 90 degrees, and the phase shift value of the third impedance converter is 90 degrees;

[0014] The second peak input matching module, the second peak amplifier and the second peak output matching module are sequentially connected in series between the second output end of the first peak power divider and the first end of the third impedance converter; the second end of the third impedance converter is electrically connected to the output end of the Doherty power amplifier circuit.

[0015] Optionally, the Doherty power amplifier circuit further includes:

[0016] a second main power divider, wherein an input end of the second main power divider is electrically connected to an input end of the Doherty power amplifier circuit, and the carrier input matching module, the carrier amplifier, and the carrier output matching module are sequentially connected in series between a first output end of the second main power divider and an output end of the Doherty power amplifier circuit;

[0017] The at least two peak tube amplification paths further include: a fourth impedance converter, a second peak power divider, a fifth impedance converter, a sixth impedance converter, and a seventh impedance converter;

[0018] A first end of the fourth impedance converter is electrically connected to the second output end of the second main power divider, a second end of the fourth impedance converter is electrically connected to the input end of the second peak power divider, and a phase shift value of the fourth impedance converter is 180 degrees;

[0019] The fifth impedance converter, the first peak input matching module, the first peak amplifier, the first peak output matching module, and the sixth impedance converter are sequentially connected in series between the first output end of the second peak power divider and the output end of the Doherty power amplifier circuit, the phase shift value of the fifth impedance converter is 90 degrees, the phase shift value of the first peak output matching module is 90 degrees, and the phase shift value of the sixth impedance converter is 90 degrees;

[0020] The second peak input matching module, the second peak amplifier, the second peak output matching module and the seventh impedance converter are connected in series between the second output end of the second peak power divider and the output end of the Doherty power amplifier circuit, the phase shift value of the second peak output matching module is 180 degrees, and the phase shift value of the seventh impedance converter is 90 degrees.

[0021] Optionally, the Doherty power amplifier circuit further includes:

[0022] a third main power splitter, wherein the input end of the third main power splitter is electrically connected to the input end of the Doherty power amplifier circuit, and the carrier input matching module, the carrier amplifier, and the carrier output matching module are sequentially connected in series between the first output end of the third main power splitter and the output end of the Doherty power amplifier circuit;

[0023] The at least two peak tube amplification paths further include: an eighth impedance converter, a ninth impedance converter, and a tenth impedance converter;

[0024] The eighth impedance converter, the first peak input matching module, the first peak amplifier, and the first peak output matching module are sequentially connected in series between the second output end of the third main power divider and the first end of the ninth impedance converter. The phase shift value of the eighth impedance converter is 270 degrees, the phase shift value of the first peak output matching module is 90 degrees, and the phase shift value of the ninth impedance converter is 90 degrees.

[0025] The tenth impedance converter, the second peak input matching module, the second peak amplifier, and the second peak output matching module are sequentially connected in series between the third output end of the third main power divider and the first end of the ninth impedance converter, the phase shift value of the tenth impedance converter is 180 degrees, and the phase shift value of the second peak output matching module is also 180 degrees;

[0026] The second end of the tenth impedance converter is electrically connected to the output end of the Doherty power amplifier circuit, and the phase shift value of the tenth impedance converter is 90 degrees.

[0027] Optionally, the Doherty power amplifier circuit further includes:

[0028] a fourth main power splitter, wherein the input end of the fourth main power splitter is electrically connected to the input end of the Doherty power amplifier circuit, and the carrier input matching module, the carrier amplifier, and the carrier output matching module are sequentially connected in series between the first output end of the fourth main power splitter and the output end of the Doherty power amplifier circuit;

[0029] The at least two peak tube amplification paths further include: an eleventh impedance converter, a twelfth impedance converter, a thirteenth impedance converter, and a fourteenth impedance converter;

[0030] The eleventh impedance converter, the first peak input matching module, the first peak amplifier, the first peak output matching module, and the twelfth impedance converter are sequentially connected in series between the second output end of the fourth main power divider and the output end of the Doherty power amplifier circuit; the phase shift value of the eleventh impedance converter is 270 degrees, the phase shift value of the first peak output matching module is 90 degrees, and the phase shift value of the twelfth impedance converter is 90 degrees;

[0031] The thirteenth impedance converter, the second peak input matching module, the second peak amplifier, the second peak output matching module and the fourteenth impedance converter are sequentially connected in series between the third output end of the fourth main power divider and the output end of the Doherty power amplifier circuit; the phase shift value of the thirteenth impedance converter is 180 degrees, the phase shift value of the second peak output matching module is 180 degrees, and the phase shift value of the fourteenth impedance converter is 90 degrees.

[0032] Optionally, the carrier output matching module includes an inductor and a capacitor.

[0033] In a second aspect, an embodiment of the present invention further provides a power amplifier, comprising the Doherty power amplifier circuit described in the first aspect.

[0034] The technical solution of the embodiment of the present invention adopts a Doherty power amplifier circuit including: a carrier tube amplification path, the carrier tube amplification path including a carrier input matching module, a carrier amplifier, and a carrier output matching module connected in series; the phase shift value of the carrier tube amplification path is n*90 degrees, and the phase shift value of the carrier output matching module is n*90 degrees, where 1≤n≤3, and n is an integer; at least two peak tube amplification paths, the phase shift value of the peak tube amplification path is (n*90+k*360) degrees, where k≥1, and k is an integer. In this embodiment, the phase shift value of the carrier tube amplification path is set to n*90 degrees, and 1≤n≤3, that is, the phase shift value is 90 degrees, 180 degrees, or 270 degrees. The overall phase shift value of the carrier tube amplification path is small, thereby reducing the insertion loss of the carrier tube amplification path; the overall phase shift value of the carrier tube amplification path is completely provided by the carrier output matching module, without the need for an additional impedance converter, thereby increasing the current carrying capacity of the power amplifier circuit and having higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the circuit structure of a Doherty power amplifier circuit provided in an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of the circuit structure of another Doherty power amplifier circuit provided in an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of the circuit structure of another power amplifier circuit provided by an embodiment of the present invention;

[0038] Figure 4 A schematic diagram of the circuit structure of another Doherty power amplifier circuit provided in an embodiment of the present invention;

[0039] Figure 5 A schematic diagram of the circuit structure of another Doherty power amplifier circuit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0041] Figure 1 A schematic diagram of the circuit structure of a Doherty power amplifier circuit provided by an embodiment of the present invention, with reference to Figure 1The Doherty power amplifier circuit includes: a carrier tube amplification path 10, the carrier tube amplification path 10 including a carrier input matching module 101, a carrier amplifier 102, and a carrier output matching module 103 connected in series; a phase shift value of the carrier tube amplification path 10 is n*90 degrees, and a phase shift value of the carrier tube output matching module 103 is n*90 degrees, where 1≤n≤3 and n is an integer; and at least two peak tube amplification paths, the phase shift value of the peak tube amplification path is (n*90+k*360) degrees, where k≥1 and k is an integer.

[0042] Specifically, the Doherty power amplifier circuit of this embodiment is a multi-channel Doherty architecture, exemplarily a three-channel Doherty architecture, such as Figure 1 As shown in, at least two peak tube amplification paths include a first peak tube amplification path 11 and a second peak tube amplification path 12; when the input power of the power amplifier circuit is low, only the carrier amplifier 102 works, and when the input power reaches the opening threshold of the peak amplifier in the first peak tube amplification path, the peak amplifier in the first peak tube amplification path starts to work, and as the input power continues to increase, when it increases to the opening threshold of the peak amplifier in the second peak tube amplification path, the peak amplifier in the second peak tube amplification path starts to work, thereby enabling the power amplifier circuit to maintain good linearity within a higher power back-off range; the carrier input matching module 101 is used to provide input matching for the carrier amplifier 102; the carrier amplifier 102 can be, for example, a MOS tube; the carrier output matching module 103 is used to provide output matching for the carrier amplifier 102; the phase shift value of the carrier tube amplification path is proportional to the phase shift value of the carrier tube amplification path. Insertion loss has a significant impact. When the overall phase shift of the carrier tube amplification path is large, the insertion loss is also large. In this embodiment, the phase shift of the carrier tube amplification path is set to n*90 degrees, and 1≤n≤3, that is, the phase shift is 90 degrees, 180 degrees, or 270 degrees. The overall phase shift of the carrier tube amplification path is small, thereby reducing the insertion loss of the carrier tube amplification path. On the other hand, the phase shift of the carrier output matching module 103 in this embodiment is also n*90 degrees. In other words, the overall phase shift of the carrier tube amplification path 10 is completely provided by the carrier output matching module 103, without the need for an additional impedance transformer. Conventional carrier tube amplification paths require the addition of a high-impedance transmission line (such as an 86.6 ohm impedance transformer). Generally, the higher the characteristic impedance of a transmission line, the narrower the line width, and the correspondingly lower the current carrying capacity. The present invention does not require an impedance transformer, thereby greatly increasing the current carrying capacity and improving reliability.

[0043] The phase shift value of each peak tube amplification path is the same, and the difference between its phase shift value and the phase shift value of the carrier tube amplification path is an integer multiple of 360 degrees, thus ensuring that the power amplifier circuit maintains good linearity within a large power back-off range. It should be noted that the phase shift value is the phase shift value of the power signal after it passes from the input end to the output end of the module. For example, the phase shift value of the carrier tube amplification path represents the phase shift value generated after the power signal passes from the input end of the carrier tube amplification path, through the carrier tube amplification path, and is output from the output end; the phase shift value of the carrier output matching module is the phase shift value generated after the power signal passes from its input end to the output end.

[0044] The technical solution of this embodiment adopts a Doherty power amplifier circuit including: a carrier tube amplification path, the carrier tube amplification path including a carrier input matching module, a carrier amplifier, and a carrier output matching module connected in series; the phase shift value of the carrier tube amplification path is n*90 degrees, and the phase shift value of the carrier output matching module is n*90 degrees, where 1≤n≤3, and n is an integer; at least two peak tube amplification paths, the phase shift value of the peak tube amplification path is (n*90+k*360) degrees, where k≥1, and k is an integer. In this embodiment, the phase shift value of the carrier tube amplification path is set to n*90 degrees, and 1≤n≤3, that is, the phase shift value is 90 degrees, 180 degrees, or 270 degrees. The overall phase shift value of the carrier tube amplification path is small, thereby reducing the insertion loss of the carrier tube amplification path; the overall phase shift value of the carrier tube amplification path is completely provided by the carrier output matching module, without the need for an additional impedance converter, thereby increasing the current carrying capacity of the power amplifier circuit and having higher reliability.

[0045] Exemplarily, the carrier tube output matching module may include an inductor and a capacitor, and its specific circuit structure is well known to those skilled in the art. For example, it may include an inductor in series and a capacitor in parallel. By adjusting the parameters of each inductor and capacitor, the phase shift value of the carrier tube output matching module can be made 90 degrees, 180 degrees or 270 degrees.

[0046] Preferably, the phase shift value of the carrier output matching module 103 is 90 degrees.

[0047] Specifically, the phase shift value of the carrier output matching module 103 has a great influence on the insertion loss of the carrier tube amplification path 10. The smaller the phase shift value, the smaller the parameter values of the required capacitance and inductance are, which greatly simplifies the circuit structure of the carrier output matching module and significantly reduces the insertion loss of the carrier output matching module.

[0048] Optionally, Figure 2 A circuit structure diagram of another Doherty power amplifier circuit provided in an embodiment of the present invention is shown in FIG. Figure 2The first peak tube amplification path includes a first peak input matching module 111, a first peak amplifier 112 and a first peak output matching module 113; the second peak tube amplification path includes a second peak input matching module 121, a second peak amplifier 122 and a second peak output matching module 123, and the phase shift value of the first peak output matching module 113 is smaller than the phase shift value of the second peak output matching module 123.

[0049] Specifically, in this embodiment, the first peak input matching module 111 is used to provide input matching for the first peak amplifier, and its circuit structure is the same as that of the carrier input matching module 101; the first peak amplifier 112 can be a MOS tube; the first peak output matching module 113 is used to provide output matching for the first peak amplifier 112, and its circuit structure is the same as that of the carrier output matching module 103; the second peak input matching module 121 is used to provide input matching for the second peak amplifier, and its circuit structure is the same as that of the carrier input matching module 101; the second peak amplifier 122 can be a MOS tube; the second peak output matching module 123 is used to provide Output matching, its circuit structure is the same as that of the carrier output matching module 103; the first peak amplification path and the second peak amplification path are also Doherty architectures. In the traditional three-way Doherty architecture, the phase shift value of the first peak output matching module and the phase shift value of the second peak output matching module are the same, which causes the first peak output matching module to have a larger phase shift value, and also causes the loss of the first peak output matching module to be larger; in this embodiment, the phase shift value of the first peak output matching module 113 can be set to be smaller than the phase shift value of the second peak output matching module 123, thereby reducing the loss of the first peak output matching module and further reducing the insertion loss of the power amplifier circuit.

[0050] Preferably, the phase shift value of the peak tube amplification path is 450 degrees. That is, the phase shift values of the first peak tube amplification path and the second peak tube amplification path are both 450 degrees. The phase shift values of the first peak tube amplification path and the second peak tube amplification path are both relatively small, which helps to simplify the circuit structure of the peak tube amplification path and further reduce the loss of the peak tube amplification path.

[0051] Preferably, continue to refer to Figure 2The Doherty power amplifier circuit further includes: a first main power divider 21, the input end of the first main power divider 21 is electrically connected to the input end IN of the Doherty power amplifier circuit, a carrier input matching module 101, a carrier amplifier 102 and a carrier output matching module 103 are sequentially connected in series between the first output end of the first main power divider 21 and the output end OUT of the Doherty power amplifier circuit; at least two peak tube amplification paths further include: a first impedance converter 201, a first peak power divider 31, a second impedance converter 202 and a third impedance converter 203; a first end of the first impedance converter 201 is electrically connected to the second output end of the first main power divider 21, a second end of the first impedance converter 201 is electrically connected to the input end of the first peak power divider 31, and the phase of the first impedance converter 201 is electrically connected to the second output end of the first main power divider 21. The phase shift value is 180 degrees; the second impedance converter 202, the first peak input matching module 111, the first peak amplifier 112 and the first peak output matching module 113 are connected in series in sequence between the first output end of the first peak power divider 31 and the first end of the third impedance converter 203, wherein the phase shift value of the second impedance converter 202 is 90 degrees, the phase shift value of the first peak output matching module 113 is 90 degrees, and the phase shift value of the third impedance converter 203 is 90 degrees; the second peak input matching module 121, the second peak amplifier 122 and the second peak output matching module 123 are connected in series in sequence between the second output end of the first peak power divider 31 and the first end of the third impedance converter 203; the second end of the third impedance converter 203 is electrically connected to the output end OUT of the Doherty power amplifier circuit.

[0052] Specifically, the first main power divider 21 is a 1:2 power divider, and the power ratio of the output signal of its first output end to the output signal of the second output end is 1:2; the first peak power divider is a 1:1 power divider, and the power ratio of the output signal of its first output end to the output signal of the second output end is 1:1; in this embodiment, the first peak tube amplification path is an amplification path composed of the first impedance converter 201, the second impedance converter 202, the first peak output matching module 111, the first peak amplifier 112, the first peak output matching module 113 and the third impedance converter 203; the second peak tube amplification path is an amplification path composed of the first impedance converter 201, the second peak input matching module 121, the second peak amplifier 122, the second peak output matching module 123 and the third impedance converter 203, and the power amplifier circuit outputs a power signal for use by the load 41. In this embodiment, the first impedance converter 201 and the third impedance converter 203 are used in both the first peak transistor amplification path and the second peak transistor amplification path. This reduces the number of components required in the power amplifier circuit, thereby reducing the size of the power amplifier circuit and saving costs. The impedance of the third impedance converter 203 is 43.3 ohms.

[0053] For example, Figure 3 A schematic diagram of a circuit structure of another power amplifier circuit provided by an embodiment of the present invention is provided. Figure 3 The power amplifier circuit further includes: a second main power divider 22, the input end of the second main power divider 22 is electrically connected to the input end of the Doherty power amplifier circuit, and a carrier input matching module 101, a carrier amplifier 102 and a carrier output matching module 103 are sequentially connected in series between the first output end of the second main power divider 22 and the output end of the Doherty power amplifier circuit; the at least two peak tube amplification paths also include: a fourth impedance converter 204, a second peak power divider 32, a fifth impedance converter 205, a sixth impedance converter 206 and a seventh impedance converter 207; a first end of the fourth impedance converter 204 is electrically connected to the second output end of the second main power divider 22, a second end of the fourth impedance converter 204 is electrically connected to the input end of the second peak power divider 32, and a phase shift value of the fourth impedance converter 204 is 180 degrees; the fifth impedance converter 205, the first peak input matching module 111, the first peak amplifier 112, the first peak output matching module 113 and the sixth impedance converter 206 are connected in series in sequence between the first output end of the second peak power divider 32 and the output end OUT of the Doherty power amplifier circuit. The phase shift value of the fifth impedance converter is 90 degrees, the phase shift value of the first peak output matching module 113 is 90 degrees, and the phase shift value of the sixth impedance converter 206 is 90 degrees. The second peak input matching module 121, the second peak amplifier 122, the second peak output matching module 123 and the seventh impedance converter 207 are connected in series in sequence between the second output end of the second peak power divider and the output end OUT of the Doherty power amplifier circuit. The phase shift value of the second peak output matching module 123 is 180 degrees, and the phase shift value of the seventh impedance converter 207 is 90 degrees.

[0054] Specifically, the second main power divider 22 is a 1:2 power divider, and the power ratio of the output signal of the first output end to the output signal of the second output end is 1:2; the second peak power divider is a 1:1 power divider, and the power ratio of the output signal of the first output end to the output signal of the second output end is 1:1; in this embodiment, the fourth impedance converter 204, the fifth impedance converter 205, the first peak input matching module 111, the first peak amplifier 112, the first peak output matching module 113 and the sixth impedance converter 206 constitute the first peak tube amplification path; the fourth impedance converter 204, the second peak input matching module Block 121, the second peak amplifier 122, the second peak output matching module 123 and the seventh impedance converter 207 constitute the second peak tube amplification path; the overall phase shift value of the two peak tube amplification paths is 450 degrees, and the fourth impedance converter 204 exists in both the first peak tube amplification path and the second peak tube amplification path, which can improve the integration. At the same time, the output bias lines of the peak tube amplification paths (sixth impedance converter 206 and seventh impedance converter 207) are not shared, which can also reduce the risk of damage to the sixth impedance converter 206 and the seventh impedance converter 207, thereby extending the service life of the power amplifier circuit.

[0055] For example, Figure 4 A circuit structure diagram of another Doherty power amplifier circuit provided in an embodiment of the present invention is shown in FIG. Figure 4The Doherty power amplifier circuit further includes: a third main power divider 23, the input end of the third main power divider 23 is electrically connected to the input end IN of the Doherty power amplifier circuit, and the carrier input matching module 101, the carrier amplifier 102 and the carrier output matching module 103 are sequentially connected in series between the first output end of the third main power divider 23 and the output end OUT of the Doherty power amplifier circuit; the at least two peak tube amplification paths further include: an eighth impedance converter 208, a ninth impedance converter 209 and a tenth impedance converter 210; the eighth impedance converter 208, the first peak input matching module 111, the first peak amplifier 112 and the first peak output matching module 113 are sequentially connected in series between the second output end of the third power divider 23 and the ninth impedance converter The first end of the ninth impedance converter 209 is electrically connected to the first end of the eighth impedance converter 208, the phase shift value of the first peak output matching module 113 is 90 degrees, and the phase shift value of the ninth impedance converter 209 is 90 degrees. The tenth impedance converter 210, the second peak input matching module 121, the second peak amplifier 122, and the second peak output matching module 123 are sequentially connected in series between the third output end of the third main power divider 23 and the first end of the ninth impedance converter 209. The phase shift value of the tenth impedance converter 210 is 180 degrees, and the phase shift value of the second peak output matching module 123 is 180 degrees. The second end of the tenth impedance converter 210 is electrically connected to the output end OUT of the Doherty power amplifier circuit, and the phase shift value of the tenth impedance converter 210 is 90 degrees.

[0056] Specifically, in this embodiment, only one power divider is required, namely the third main power divider 23. The third main power divider 23 is a 1:1:1 power divider, and the ratio of the power of the output signal of the first output end, the power of the output signal of the second output end, and the power of the output signal of the third output end is 1:1:1; the eighth impedance converter 208, the first peak input matching module 111, the first peak amplifier 112, the first peak output matching module 113 and the ninth impedance converter 209 constitute the first peak tube amplification path; the tenth impedance converter 210, the second peak input matching module 111, the first peak amplifier 112, the first peak output matching module 113 and the ninth impedance converter 209 constitute the first peak tube amplification path; Block 121, the second peak amplifier 122, the second peak output matching module 123 and the ninth impedance converter 209 constitute a second peak tube amplification path; the ninth impedance converter 209 is arranged in both the first peak tube amplification path and the second peak tube amplification path, thereby improving the integration level. At the same time, since the input bias lines of the peak tube amplification paths (the eighth impedance converter 208 and the tenth impedance converter 210) are not shared, the risk of damage to the eighth impedance converter 208 and the tenth impedance converter 210 can also be reduced, thereby extending the service life of the power amplifier circuit.

[0057] For example, Figure 5A circuit structure diagram of another Doherty power amplifier circuit provided in an embodiment of the present invention is shown in FIG. Figure 5 The Doherty power amplifier circuit further includes: a fourth main power divider 24, the input end of the fourth main power divider 24 is electrically connected to the input end IN of the Doherty power amplifier circuit, and the carrier input matching module 101, the carrier amplifier 102 and the carrier output matching module 103 are sequentially connected in series between the first output end of the fourth main power divider 24 and the output end OUT of the Doherty power amplifier circuit; the at least two peak tube amplification paths further include: an eleventh impedance converter 211, a twelfth impedance converter 212, a thirteenth impedance converter 213 and a fourteenth impedance converter 214; the eleventh impedance converter 211, the first peak input matching module 111, the first peak amplifier 112, the first peak output matching module 113 and the twelfth impedance converter 212 are sequentially connected in series. The fourth main power divider 24 is connected between the second output terminal and the output terminal OUT of the Doherty power amplifier circuit; the eleventh impedance converter 211 has a phase shift value of 270 degrees, the first peak output matching module 113 has a phase shift value of 90 degrees, and the twelfth impedance converter 212 has a phase shift value of 90 degrees; the thirteenth impedance converter 213, the second peak input matching module 121, the second peak amplifier 122, the second peak output matching module 123, and the fourteenth impedance converter 214 are connected in series between the third output terminal of the fourth main power divider 24 and the output terminal OUT of the Doherty power amplifier circuit; the thirteenth impedance converter 213 has a phase shift value of 180 degrees, the second peak output matching module 123 has a phase shift value of 180 degrees, and the fourteenth impedance converter 214 has a phase shift value of 90 degrees.

[0058] Specifically, in this embodiment, only one power divider is required, namely, the fourth main power divider 24. The fourth main power divider 24 is a 1:1:1 power divider, and the ratio of the power of the output signal of the first output end, the power of the output signal of the second output end, and the power of the output signal of the third output end is 1:1:1; the eleventh impedance converter 211, the first peak input matching module 111, the first peak amplifier 112, the first peak output matching module 113, and the twelfth impedance converter 212 constitute the first peak tube amplification path; the thirteenth impedance converter 213, the second peak The value input matching module 121, the second peak amplifier 122, the second peak output matching module 123 and the fourteenth impedance converter 214 constitute a second peak tube amplification path; since the input bias line of the peak tube amplification path (the eleventh impedance converter 211 and the thirteenth impedance converter 213) is not shared, and the output bias line of the peak tube amplification path (the twelfth impedance converter 212 and the fourteenth impedance converter 214) is not shared, the risk of damage to the input bias line and the output bias line of the peak tube amplification path can also be reduced, thereby extending the service life of the power amplifier circuit.

[0059] Exemplarily, the impedance converters in this embodiment can all be implemented using transmission lines.

[0060] An embodiment of the present invention further provides a power amplifier, which includes the power amplifier circuit provided by any embodiment of the present invention. Since the power amplifier includes the Doherty power amplifier circuit provided by any embodiment of the present invention, it also has the same beneficial effects, which will not be described in detail here.

[0061] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A Doherty power amplifier circuit, characterized in that: The Doherty power amplifier circuit comprises: a carrier tube amplification path, the carrier tube amplification path comprising a carrier input matching module, a carrier amplifier, and a carrier output matching module connected in series; a phase shift value of the carrier tube amplification path being n*90 degrees, and a phase shift value of the carrier output matching module being n*90 degrees, where 1≤n≤3 and n is an integer; and an overall phase shift value of the carrier tube amplification path being entirely provided by the carrier output matching module; At least two peak tube amplification paths, the phase shift value of the peak tube amplification path is (n*90+k*360) degrees, k≥1, and k is an integer.

2. The Doherty power amplifier circuit according to claim 1, wherein: The phase shift value of the carrier output matching module is 90 degrees.

3. The Doherty power amplifier circuit according to claim 2, characterized in that: The at least two peak tube amplification paths include a first peak tube amplification path and a second peak tube amplification path, the first peak tube amplification path includes a first peak input matching module, a first peak amplifier and a first peak output matching module, the second peak tube amplification path includes a second peak input matching module, a second peak amplifier and a second peak output matching module, and the phase shift value of the first peak output matching module is smaller than the phase shift value of the second peak output matching module.

4. The Doherty power amplifier circuit according to claim 3, characterized in that: The phase shift value of the peak tube amplification path is 450 degrees.

5. The Doherty power amplifier circuit according to claim 4, characterized in that: The Doherty power amplifier circuit further includes: a first main power divider, wherein an input end of the first main power divider is electrically connected to an input end of the Doherty power amplifier circuit, and the carrier input matching module, the carrier amplifier, and the carrier output matching module are sequentially connected in series between a first output end of the first main power divider and an output end of the Doherty power amplifier circuit; The at least two peak tube amplification paths further include: a first impedance converter, a first peak power divider, a second impedance converter, and a third impedance converter; The first end of the first impedance converter is electrically connected to the second output end of the first main power divider, the second end of the first impedance converter is electrically connected to the input end of the first peak power divider, and the phase shift value of the first impedance converter is 180 degrees; The second impedance converter, the first peak input matching module, the first peak amplifier, and the first peak output matching module are sequentially connected in series between the first output end of the first peak power divider and the first end of the third impedance converter, wherein the phase shift value of the second impedance converter is 90 degrees, the phase shift value of the first peak output matching module is 90 degrees, and the phase shift value of the third impedance converter is 90 degrees; The second peak input matching module, the second peak amplifier and the second peak output matching module are sequentially connected in series between the second output end of the first peak power divider and the first end of the third impedance converter; the second end of the third impedance converter is electrically connected to the output end of the Doherty power amplifier circuit.

6. The Doherty power amplifier circuit according to claim 4, characterized in that: The Doherty power amplifier circuit further includes: a second main power divider, wherein an input end of the second main power divider is electrically connected to an input end of the Doherty power amplifier circuit, and the carrier input matching module, the carrier amplifier, and the carrier output matching module are sequentially connected in series between a first output end of the second main power divider and an output end of the Doherty power amplifier circuit; The at least two peak tube amplification paths further include: a fourth impedance converter, a second peak power divider, a fifth impedance converter, a sixth impedance converter, and a seventh impedance converter; A first end of the fourth impedance converter is electrically connected to the second output end of the second main power divider, a second end of the fourth impedance converter is electrically connected to the input end of the second peak power divider, and a phase shift value of the fourth impedance converter is 180 degrees; The fifth impedance converter, the first peak input matching module, the first peak amplifier, the first peak output matching module, and the sixth impedance converter are sequentially connected in series between the first output end of the second peak power divider and the output end of the Doherty power amplifier circuit, the phase shift value of the fifth impedance converter is 90 degrees, the phase shift value of the first peak output matching module is 90 degrees, and the phase shift value of the sixth impedance converter is 90 degrees; The second peak input matching module, the second peak amplifier, the second peak output matching module and the seventh impedance converter are connected in series between the second output end of the second peak power divider and the output end of the Doherty power amplifier circuit, the phase shift value of the second peak output matching module is 180 degrees, and the phase shift value of the seventh impedance converter is 90 degrees.

7. The Doherty power amplifier circuit according to claim 4, characterized in that: The Doherty power amplifier circuit further includes: a third main power splitter, wherein the input end of the third main power splitter is electrically connected to the input end of the Doherty power amplifier circuit, and the carrier input matching module, the carrier amplifier, and the carrier output matching module are sequentially connected in series between the first output end of the third main power splitter and the output end of the Doherty power amplifier circuit; The at least two peak tube amplification paths further include: an eighth impedance converter, a ninth impedance converter, and a tenth impedance converter; The eighth impedance converter, the first peak input matching module, the first peak amplifier, and the first peak output matching module are sequentially connected in series between the second output end of the third main power divider and the first end of the ninth impedance converter. The phase shift value of the eighth impedance converter is 270 degrees, the phase shift value of the first peak output matching module is 90 degrees, and the phase shift value of the ninth impedance converter is 90 degrees. The tenth impedance converter, the second peak input matching module, the second peak amplifier, and the second peak output matching module are sequentially connected in series between the third output end of the third main power divider and the first end of the ninth impedance converter, the phase shift value of the tenth impedance converter is 180 degrees, and the phase shift value of the second peak output matching module is also 180 degrees; The second end of the tenth impedance converter is electrically connected to the output end of the Doherty power amplifier circuit, and the phase shift value of the tenth impedance converter is 90 degrees.

8. The Doherty power amplifier circuit according to claim 4, characterized in that: The Doherty power amplifier circuit further includes: a fourth main power splitter, wherein the input end of the fourth main power splitter is electrically connected to the input end of the Doherty power amplifier circuit, and the carrier input matching module, the carrier amplifier, and the carrier output matching module are sequentially connected in series between the first output end of the fourth main power splitter and the output end of the Doherty power amplifier circuit; The at least two peak tube amplification paths further include: an eleventh impedance converter, a twelfth impedance converter, a thirteenth impedance converter, and a fourteenth impedance converter; The eleventh impedance converter, the first peak input matching module, the first peak amplifier, the first peak output matching module, and the twelfth impedance converter are sequentially connected in series between the second output end of the fourth main power divider and the output end of the Doherty power amplifier circuit; the phase shift value of the eleventh impedance converter is 270 degrees, the phase shift value of the first peak output matching module is 90 degrees, and the phase shift value of the twelfth impedance converter is 90 degrees; The thirteenth impedance converter, the second peak input matching module, the second peak amplifier, the second peak output matching module and the fourteenth impedance converter are sequentially connected in series between the third output end of the fourth main power divider and the output end of the Doherty power amplifier circuit; the phase shift value of the thirteenth impedance converter is 180 degrees, the phase shift value of the second peak output matching module is 180 degrees, and the phase shift value of the fourteenth impedance converter is 90 degrees.

9. The Doherty power amplifier circuit according to claim 1, wherein: The carrier output matching module includes an inductor and a capacitor.

10. A power amplifier, characterized in that: The invention comprises the Doherty power amplifier circuit according to any one of claims 1 to 9.

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