High-frequency module
A high-frequency module includes a transmission signal amplifier that outputs a transmission signal to an antenna terminal side; a reception signal amplifier that amplifies a reception signal supplied from an antenna terminal; a switch that selectively connects the antenna terminal to either an output of the transmission signal amplifier or an input of the reception signal amplifier; and a directional coupler that is provided on a transmission signal path and detects a signal level of the transmission signal. The transmission signal amplifier is controlled by a first control signal supplied from a first control circuit. The reception signal amplifier is controlled by a second control signal supplied from a second control circuit. The switch is controlled by a switch control signal supplied from the first control circuit. The directional coupler is controlled by a coupler control signal supplied from the first control circuit.
1. A high-frequency module comprising:
a transmission signal amplifier configured to amplify a radio frequency signal and output a transmission signal to an antenna terminal;
a reception signal amplifier configured to amplify a reception signal supplied from the antenna terminal;
a switch circuit configured to selectively connect the antenna terminal to an output of the transmission signal amplifier and an input of the reception signal amplifier;
a directional coupler provided on a transmission signal path between the transmission signal amplifier and the antenna terminal, the directional coupler being configured to detect a signal level of the transmission signal;
a first control circuit configured to control:
the transmission signal amplifier by a first control signal,
the switch circuit by a switch control signal, and
the directional coupler by a coupler control signal; and
a second control circuit configured to control the reception signal amplifier by a second control signal,
wherein the switch circuit is connected directly to the input of the reception signal amplifier.
2. The high-frequency module according to claim 1 , wherein the directional coupler is connected between the antenna terminal and the switch circuit.
3. The high-frequency module according to claim 2 , wherein the switch circuit comprises a plurality of switches.
4. The high-frequency module according to claim 2 , wherein the switch circuit includes only a single switch.
5. The high-frequency module according to claim 2 , wherein the directional coupler is a bidirectional coupler further configured to detect a signal level of a reflected wave of the transmission signal.
6. The high-frequency module according to claim 1 , wherein the switch circuit is connected between the antenna terminal and the directional coupler.
7. The high-frequency module according to claim 6 , wherein the switch circuit comprises a plurality of switches.
8. The high-frequency module according to claim 6 , wherein the switch circuit includes only a single switch.
9. The high-frequency module according to claim 6 , wherein the directional coupler is a bidirectional coupler further configured to detect a signal level of a reflected wave of the transmission signal.
10. The high-frequency module according to claim 1 , wherein the switch circuit comprises a plurality of switches.
11. The high-frequency module according to claim 10 , wherein the directional coupler is a bidirectional coupler further configured to detect a signal level of a reflected wave of the transmission signal.
12. The high-frequency module according to claim 1 , wherein the switch circuit includes only a single switch.
13. The high-frequency module according to claim 12 , wherein the directional coupler is a bidirectional coupler further configured to detect a signal level of a reflected wave of the transmission signal.
14. The high-frequency module according to claim 1 , wherein the directional coupler is a bidirectional coupler further configured to detect a signal level of a reflected wave of the transmission signal.
15. The high-frequency module according to claim 1 , further comprising:
a band pass filter provided on the transmission signal path, or a reception signal path between the reception signal amplifier and the antenna terminal,
wherein the band pass filter is configured to attenuate frequencies outside a frequency band of the transmission signal when the band pass filter is provided on the transmission signal path, and
wherein the band pass filter is configured to attenuate frequencies outside a frequency band of the reception signal when the band pass filter is provided on the reception signal path.
16. The high-frequency module according to claim 1 , further comprising:
a first band pass filter provided on the transmission signal path and configured to attenuate frequencies outside a frequency band of the transmission signal; and
a second band pass filter provided on a reception signal path between the reception signal amplifier and the antenna terminal, and configured to attenuate frequencies outside a frequency band of the reception signal.
17. The high-frequency module according to claim 16 , wherein the first band pass filter and the second band pass filter are configured as a duplexer.
18. The high-frequency module according to claim 1 , further comprising:
a terminal configured to connect the high-frequency module to an external band pass filter,
wherein the external band pass filter is configured to attenuate frequencies outside a frequency band of the transmission signal or the reception signal.
19. The high-frequency module according to claim 1 , further comprising:
a second switch circuit, wherein the transmission signal amplifier is connected between the second switch circuit and the antenna terminal.
20. The high-frequency module according to claim 1 , further comprising:
a third switch circuit, wherein the reception signal amplifier is connected between the third switch circuit and the antenna terminal.
21. The high-frequency module according to claim 1 , wherein the first control signal, the switch control signal, and the coupler control signal are synchronized with one another.