Hybrid lattice filter with acoustic balun
AssigneeQorvo US, Inc.
InventorsYazid Yusuf, Marcus Granger-Jones
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Abstract
Hybrid lattice filters with acoustic baluns are disclosed. In one aspect, a hybrid lattice filter may be formed using acoustic elements. The hybrid lattice filter may operate with acoustic baluns such as coupled resonator filters (CRF) or stacked crystal filters (SCF). To achieve the desired common mode rejection, an additional rejection or low common mode intermediate impedance network may be supplied between the acoustic balun and the hybrid lattice filter. By combining the acoustic balun with the low common-mode intermediate impedance network and the hybrid lattice filter, a passband filter with a desired bandwidth may be created.
Claims20
A filter comprising:
- an acoustic balun configured to transform a balanced signal to an unbalanced signal;
- a hybrid lattice filter comprising two lattice impedance elements;
- and
- an intermediate impedance network positioned between the acoustic balun and the hybrid lattice filter.
A method of filtering a signal comprising:
- turning an unbalanced signal into a balanced signal using an acoustic balun;
- using a low common-mode intermediate impedance network on the balanced signal;
- and
- using a hybrid lattice filter on the balanced signal.
A communication device comprising:
- a transceiver chain comprising:
- a power amplifier;
- and
- a filter comprising:
- an acoustic balun configured to transform a balanced signal to an unbalanced signal;
- a hybrid lattice filter comprising two lattice impedance elements;
- and
- an intermediate impedance network positioned between the acoustic balun and the hybrid lattice filter.
Dependencies are inferred from the claim text.