CN-116569484-B - High-frequency module and communication device

Abstract

The loss of the output signal in the low output mode can be suppressed, and the signal path for the output signal to enter the low output mode in the high output mode can also be suppressed. The high-frequency module (1) is provided with a first power amplifier (4A), a second power amplifier (4B), a filter (6A), a switch (7), and a matching circuit (5B). The first power amplifier (4A) outputs a first amplified signal. The second power amplifier (4B) outputs a second amplified signal. A filter (6A) passes the first amplified signal and the second amplified signal. The switch (7) has a first terminal (7 b) and a second terminal (7 a). The first terminal (7 b) is connected to the output of the first power amplifier (4A). The second terminal (7 a) is connected to the filter (6A). The switch (7) switches between on and off of the first terminal (7 b) and the second terminal (7 a). The matching circuit (5B) is connected between the output of the second power amplifier (4B) and a signal path between the second terminal (7 a) of the switch (7) and the filter (6A).

Inventors

• KENICHI HORIGUCHI

Assignees

• 株式会社村田制作所

Dates

Publication Date

20260505

Application Date

20211126

Priority Date

20201202

Claims (11)

1. 1.A high-frequency module is provided with: a first power amplifier that amplifies a first signal to output a first amplified signal; A second power amplifier that amplifies a second signal at an amplification factor smaller than that of the first power amplifier to output a second amplified signal; A filter that passes the first amplified signal and the second amplified signal; A switch having a first terminal connected to an output portion of the first power amplifier and a second terminal connected to the filter, the switch switching on and off between the first terminal and the second terminal, and A matching circuit connected between an output of the second power amplifier and a signal path between the second terminal of the switch and the filter, Wherein the switch is not provided on a signal path between the output of the second power amplifier and the filter.
2. 2. The high-frequency module according to claim 1, wherein, The matching circuit has a high pass filter in a last stage of 1 or more processing stages of the matching circuit, the processing stages being configured to process the second amplified signal of the second power amplifier and output the processed signal from the output unit.
3. 3. The high-frequency module according to claim 2, wherein, The signal path is set to a first signal path, The matching circuit has: A capacitor connected in series with the second power amplifier on a second signal path different from the first signal path, the second signal path being a signal path between the output of the second power amplifier and the second terminal of the switch, and An inductor connected between the second signal path and ground.
4. 4. The high-frequency module according to claim 2, wherein, The signal path is set to a first signal path, The matching circuit has: An inductor connected in series with the second power amplifier on a second signal path different from the first signal path, the second signal path being a signal path between the output of the second power amplifier and the second terminal of the switch, and A capacitor connected between the second signal path and ground.
5. 5. The high-frequency module according to any one of claims 1 to 4, wherein, In the case that +1 and-1 of the real part of the reflection coefficient corresponding to the impedance of the matching circuit correspond to infinity and zero of the impedance respectively, The phase angle when the reflection coefficient is represented by polar coordinates is a value of-45 degrees or more and +45 degrees or less.
6. 6. The high-frequency module according to any one of claims 1 to 4, wherein, In the case that +1 and-1 of the real part of the reflection coefficient corresponding to the impedance of the matching circuit correspond to infinity and zero of the impedance respectively, The real part of the reflection coefficient is a value of 0.7 or more and 1 or less.
7. 7. The high-frequency module according to any one of claims 1 to 4, wherein, The bias current of the second power amplifier is zero in the on state of the switch.
8. 8. The high-frequency module according to any one of claims 2 to 4, wherein, The cut-off frequency of the high pass filter is lower than the frequency of the second amplified signal output from the second power amplifier.
9. 9. The high-frequency module according to any one of claims 1 to 4, wherein, Setting the filter as a first filter, setting the matching circuit as a first matching circuit, The high-frequency module further comprises: a third power amplifier that amplifies a third signal at an amplification factor smaller than that of the first power amplifier to output a third amplified signal; A second filter for passing the first amplified signal and the third amplified signal, and A second matching circuit is provided for matching the first and second signals, The switch further has a third terminal connected to the second filter, the switch switching on and off between the first terminal and the third terminal, The second matching circuit is connected between an output of the third power amplifier and a signal path between the third terminal of the switch and the second filter.
10. 10. The high-frequency module according to claim 1, wherein, In the signal path, no switch is provided between the matching circuit and the filter.
11. 11. A communication device is provided with: a high-frequency module according to any one of claims 1 to 10, and And a signal processing circuit connected to the high frequency module for performing signal processing on the high frequency signal.

Description

High-frequency module and communication device Technical Field The present invention relates to a high-frequency module and a communication device, and more particularly, to a high-frequency module including a first power amplifier and a second power amplifier, and a communication device including the high-frequency module. Background The transmission circuit (high frequency module) described in patent document 1 includes a first amplifier, a second amplifier, and 2 switches. The first path and the second path are connected in parallel between 2 switches. The first path is connected to the second amplifier. One of the switches is connected to the antenna, and the other switch is connected to the signal input section via the first amplifier. In the high output mode, the first path is selected by 2 switches. Thus, the transmission signal inputted to the signal input unit is amplified by the first amplifier and the second amplifier and then transmitted from the antenna. In the low output mode, the second path is selected by 2 switches. Thus, the transmission signal inputted to the signal input section is amplified by the first amplifier and transmitted from the antenna without going through the second amplifier. Prior art literature Patent literature Patent document 1 Japanese patent laid-open publication No. 2010-68283 Disclosure of Invention Problems to be solved by the invention In the transmission circuit described in patent document 1, in the low output mode, a transmission signal is transmitted via 2 switches. Therefore, the transmission signal in the low output mode generates loss in 2 switches. Therefore, it is required to suppress the loss of the transmission signal in the low output mode. In this case, it is necessary to suppress the transmission signal in the high output mode from entering the second path (the signal path for the low output mode). The invention aims to provide a high-frequency module and a communication device, which can inhibit loss of an output signal in a low-output mode and inhibit the output signal in a high-output mode from entering a signal path for the low-output mode. Solution for solving the problem The high-frequency module according to one embodiment of the present invention includes a first power amplifier, a second power amplifier, a filter, a switch, and a matching circuit. The first power amplifier amplifies a first signal to output a first amplified signal. The second power amplifier amplifies the second signal at an amplification factor smaller than that of the first power amplifier to output a second amplified signal. The filter passes the first amplified signal and the second amplified signal. The switch has a first terminal and a second terminal. The first terminal is connected to an output of the first power amplifier. The second terminal is connected with the filter. The switch switches on and off between the first terminal and the second terminal. The matching circuit is connected between an output of the second power amplifier and a signal path between the second terminal of the switch and the filter. The communication device according to one embodiment of the present invention includes the high-frequency module and the signal processing circuit. The signal processing circuit is connected with the high-frequency module and is used for processing signals of high-frequency signals. ADVANTAGEOUS EFFECTS OF INVENTION According to the invention, the loss of the output signal in the low output mode can be restrained, and the signal path for the output signal in the high output mode to enter the low output mode can be restrained. Drawings Fig. 1 is a block diagram of a high-frequency module and a communication device according to embodiment 1. Fig. 2 is an explanatory diagram illustrating the impedance of the matching circuit. Fig. 3 is a circuit configuration diagram of a matching circuit according to modification 1 of embodiment 1. Fig. 4 is a block diagram of a high-frequency module and a communication device according to embodiment 2. Detailed Description (Embodiment 1) (1) Summary of the inventionsummary As shown in fig. 1, the high-frequency module 1 according to embodiment 1 includes a power amplifier 4A (first power amplifier), a power amplifier 4B (second power amplifier), a filter 6A (first filter), a switch 7, and a matching circuit 5B (first matching circuit). The power amplifier 4A amplifies the transmission signal S1 (first signal) at a first amplification rate to output a first amplified signal. The power amplifier 4B amplifies the transmission signal S1 (second signal) at a second amplification factor smaller than the first amplification factor to output a second amplified signal. The filter 6A passes the first amplified signal and the second amplified signal. The switch 7 has a terminal 7b (first terminal) and a terminal 7a (second terminal). The terminal 7b is a terminal electrically connected to the output portion of the power amplifier 4A. The t