Electronic circuit and electronic module
An electronic circuit includes a plurality of duplexers that are coupled to an antenna terminal and have a pass band different from each other and a plurality of acoustic wave filters that are respectively coupled between the antenna terminal and the plurality of the duplexers, wherein filter characteristics of a first acoustic wave filter of the plurality of the acoustic wave filters are set so as to allow passage of a signal in both a pass band for transmitting and a pass band for receiving of a first duplexer of the plurality of the duplexers that is coupled to the first acoustic wave filter and suppress passage of a signal in both a pass band for transmitting and a pass band for receiving of a second duplexer of the plurality of the duplexers that is different from the first duplexer.
1. An electronic circuit comprising:
a plurality of duplexers that are coupled to an antenna terminal and have a pass band different from each other; and
a plurality of acoustic wave filters that are respectively coupled between the antenna terminal and the plurality of the duplexers, the plurality of acoustic wave filters including a first acoustic wave filter and a second acoustic wave filter,
wherein filter characteristics of the first acoustic wave filter of the plurality of the acoustic wave filters are set so as to allow passage of a signal in both a pass band for transmitting and a pass band for receiving of a first duplexer of the plurality of the duplexers that is coupled to the first acoustic wave filter and suppress passage of a signal in both a pass band for transmitting and a pass band for receiving of a second duplexer of the plurality of the duplexers that is different from the first duplexer and that is coupled to the second acoustic wave filter;
each of the first acoustic wave filter and the second acoustic wave filter is a band pass filter; and
a frequency band included in a pass band of the first acoustic wave filter and a frequency band included in a pass band of the second acoustic wave filter are used for Carrier Aggregation.
2. The electronic circuit as claimed in claim 1 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter is a double mode filter.
3. The electronic circuit as claimed in claim 1 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter is a filter using a bulk wave.
4. The electronic circuit as claimed in claim 1 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter is a CRF (Coupled Resonator Filter) having a piezoelectric thin film.
5. The electronic circuit as claimed in claim 4 , wherein the piezoelectric thin film is aluminum nitride including an element increasing piezoelectric constant.
6. The electronic circuit as claimed in claim 1 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter uses a plate wave.
7. An electronic module comprising an electronic circuit that includes:
a plurality of duplexers that are coupled to an antenna terminal and have a pass band different from each other; and
a plurality of acoustic wave filters that are respectively coupled between the antenna terminal and the plurality of the duplexers, the plurality of acoustic wave filters including a first acoustic wave filter and a second acoustic wave filter,
wherein:
filter characteristics of the first acoustic wave filter of the plurality of the acoustic wave filters are set so as to allow passage of a signal in both a pass band for transmitting and a pass band for receiving of a first duplexer of the plurality of the duplexers that is coupled to the first acoustic wave filter and suppress passage of a signal in both a pass band for transmitting and a pass band for receiving of a second duplexer of the plurality of the duplexers that is different from the first duplexer and that is coupled to the second acoustic wave filter; and
each of the first acoustic wave filter and the second acoustic wave filter is a band pass filter.
8. The electronic module as claimed in claim 7 , wherein a frequency band included in a pass band of the first acoustic wave filter and a frequency band included in a pass band of the second acoustic wave filter are used for Carrier Aggregation.
9. The electronic module as claimed in claim 7 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter is a double mode filter.
10. The electronic module as claimed in claim 7 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter is a filter using a bulk wave.
11. The electronic module as claimed in claim 7 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter is a CRF (Coupled Resonator Filter) having a piezoelectric thin film.
12. The electronic module as claimed in claim 11 , wherein the piezoelectric thin film is aluminum nitride including an element increasing piezoelectric constant.
13. The electronic module as claimed in claim 7 , wherein at least one of the first acoustic wave filter and the second acoustic wave filter uses a plate wave.