Tiled transversely-excited film bulk acoustic resonator high power filters
Tiled filters are disclosed. A filter includes an n×m array of sub-filters, where n is a number of sub-filters in parallel and m is a number of sub-filters in series. n and m are non-zero positive integers and at least one of n and m is greater than one. All of the nm sub-filters are bandpass filters with substantially the same passbands.
1. A filter comprising:
an n×m array of sub-filters, where;
n is a number of sub-filters in parallel,
m is a number of sub-filters in series,
n and m are non-zero positive integers,
at least one of n and m is greater than one, and
all of the nm sub-filters are bandpass filters with substantially the same pass-bands; and
a filter input connected to inputs of n sub-filters of the nm sub-filters,
wherein an input of each of the n sub-filters is approximately matched to nZs, where Zs is a system source impedance.
2. The filter of claim 1 , wherein each of the nm sub-filters comprises:
a plurality of transversely-excited film bulk acoustic resonators connected in a ladder filter circuit.
3. The filter of claim 1 , wherein Zs=50 ohms, n=2, and the input of the each of the two sub-filters is matched to 100 ohms.
4. The filter of claim 1 , wherein Zs=50 ohms, n=3, and the input of the each of the three sub-filters is matched to 150 ohms.
5. A filter comprising:
an n×m array of sub-filters, where:
n is a number of sub-filters in parallel,
m is a number of sub-filters in series,
n and m are non-zero positive integers,
at least one of n and m is greater than one, and
all of the nm sub-filters are bandpass filters with substantially a same pass-band; and
a filter output connected to outputs of n sub-filters of the nm sub-filters,
wherein an output of each of the n sub-filters is approximately matched to nZl, where Zl is a system load impedance.
6. The filter of claim 5 , wherein Zl=50 ohms, n=2, and the output of the each of the two sub-filters is matched to 100 ohms.
7. The filter of claim 5 , wherein Zl=50 ohms, n=3, and the output of the each of the three sub-filters is matched to 150 ohms.
8. A filter comprising:
n sub-filters connected in parallel between a filter input and a filter output,
wherein all of the n sub-filters are bandpass filters with substantially the same pass-bands, and
wherein each of the n sub-filters has an input connected to the filter input, and each of the inputs of the n sub-filters is approximately matched to nZs, where Zs is a system source impedance.
9. The filter of claim 8 , wherein Zs=50 ohms, n=2, and the input of the each of the two sub-filters is matched to 100 ohms.
10. The filter of claim 8 , wherein each of the n sub-filters comprises:
a plurality of transversely-excited film bulk acoustic resonators connected in a ladder filter circuit.
11. The filter of claim 8 , wherein Zs=50 ohms, n=3, and the input of the each of the three sub-filters is matched to 150 ohms.
12. The filter of claim 8 , wherein
each of the n sub-filters has an output connected to the filter output, and
each of the outputs of the n sub-filters is approximately matched to nZl, where Zl is a system load impedance.
13. The filter of claim 12 , wherein Zl=50 ohms, n=2, and the output of the each of the two sub-filters is matched to 100 ohms.
14. The filter of claim 12 , wherein Zl=50 ohms, n=3, and the output of the each of the three sub-filters is matched to 150 ohms.