Dynamic band steering filter bank die
Disclosed is a filter bank die having a first acoustic wave (AW) filter having a first antenna terminal and a first filter terminal, and a second AW filter having a second filter terminal, and a second antenna terminal coupled to the first antenna terminal to effectively diplex signals that pass through the first AW filter and the second AW filter.
1. A filter bank die comprising:
a first acoustic wave (AW) filter having a first antenna terminal and a first filter terminal, wherein the first AW filter is configured as a bandpass filter to pass a first passband with a filter skirt having a first falling slope that spans between a 100 MHz and a 160 MHz gap between adjacent passbands and a first rising slope that spans a gap less than the gap of the first falling slope; and
a second AW filter configured to pass frequencies of a passband that are different from the frequencies of the first passband of the first AW filter, wherein the second AW filter has a second antenna terminal coupled to the first antenna terminal and a second filter terminal to diplex signals that pass through the first AW filter and the second AW filter; and
wherein the second AW filter is configured to pass the frequencies of the second passband with a second filter skirt having a second rising slope that spans another gap between 100 MHz and 160 MHz.
2. The filter bank die of claim 1 wherein the first AW filter is configured to have a filter skirt with a slope that spans at least a 100 MHz gap between adjacent passbands.
3. The filter bank die of claim 1 wherein the second AW filter is configured to have a filter skirt with a slope that spans at least a 100 MHz gap between adjacent passbands.
4. The filter bank die of claim 1 wherein the second AW filter is configured as a bandpass filter to pass a UNII-2c to UNII-3 passband with a filter skirt having a rising slope that spans up to a 160 MHz gap between adjacent passbands.
5. The filter bank die of claim 1 wherein the first AW filter is configured as a bandpass filter to pass a UNII-1 to UNII-2a passband with a filter skirt having a falling slope that spans up to a 160 MHz gap between adjacent passbands and the second AW filter is configured as a bandpass filter to pass a UNII-2c to UNII-3 passband with a filter skirt having a rising slope that spans up to a 160 MHz gap between adjacent passbands.
6. The filter bank die of claim 1 wherein the first AW filter is configured as a bandpass filter to pass a UNII-2c to UNII-4 passband with a filter skirt having a rising slope that spans up to a 160 MHz gap between adjacent passbands.
7. The filter bank die of claim 1 wherein the second AW filter is configured to pass a UNII-5 to UNII-8 passband while rejecting the UNII-2c to UNII-4 passband.
8. The filter bank die of claim 1 wherein the first AW filter is configured as a bandpass filter to pass a UNII-2c to UNII-4 passband with a filter skirt having a rising slope that spans up to a 160 MHz gap between adjacent passbands and the second AW filter is configured to pass a UNII-5 to UNII-8 passband while rejecting the UNII-2c to UNII-4 passband.
9. The filter bank die of claim 1 wherein the first antenna terminal and the second antenna terminal are directly coupled together.
10. The filter bank die of claim 1 integrated into a filter bank module comprising a single-pole double-throw switch having a first throw terminal coupled to the first filter terminal and a second throw terminal coupled to the second filter terminal and a single pole terminal.
11. The filter bank die of claim 1 integrated into a filter bank module comprising a double-pole double-throw switch having a first throw terminal coupled to the first filter terminal and a second throw terminal coupled to the second filter terminal, a transmit pole terminal, and a receive pole terminal.
12. The filter bank die of claim 11 wherein the double-pole double-throw switch is configured to selectively couple the receive pole terminal between the first throw terminal and the second throw terminal.
13. The filter bank die of claim 11 wherein the double-pole double-throw switch is configured to selectively couple the transmit pole terminal between the first throw terminal and the second throw terminal.
14. The filter bank die of claim 11 wherein the filter bank module further comprises a low-noise amplifier (LNA) having an LNA input terminal coupled to the receive pole terminal and an LNA output terminal.
15. The filter bank die of claim 14 wherein the filter bank module further comprises a power amplifier (PA) having a PA output coupled to the transmit pole terminal and a PA input.
16. The filter bank die of claim 1 wherein the filter bank module further comprises a passive filter having a third antenna terminal coupled to an antenna port and a third filter terminal.
17. The filter bank die of claim 16 wherein the passive filter comprises at least one inductor and at least one capacitor.
18. The filter bank die of claim 16 wherein the third antenna terminal is coupled directly to both the first antenna terminal and the second antenna terminal.
19. The filter bank die of claim 16 wherein the filter bank module further comprises a single-pole double-throw switch having a first throw terminal coupled to the first filter terminal and a second throw terminal coupled to the second filter terminal and a single pole terminal.
20. The filter bank die of claim 16 wherein the filter bank module further comprises a double-pole double-throw switch having a first throw terminal coupled to the first filter terminal and a second throw terminal coupled to the second filter terminal, a transmit pole terminal, and a receive pole terminal.
21. The filter bank die of claim 20 wherein the double-pole double-throw switch is configured to selectively couple the receive pole terminal between the first throw terminal and the second throw terminal.
22. The filter bank die of claim 20 wherein the double-pole double-throw switch is configured to selectively couple the transmit pole terminal between the first throw terminal and the second throw terminal.
23. The filter bank die of claim 20 wherein the filter bank module further comprises a low-noise amplifier (LNA) having an LNA input terminal coupled to the receive pole terminal and an LNA output terminal.
24. The filter bank die of claim 23 wherein the further comprising a power amplifier (PA) having a PA output coupled to the transmit pole terminal and a PA input.
25. The filter bank die of claim 20 wherein an insertion loss between either of the transmit pole terminal or the receive pole terminal and an antenna port minus an insertion loss of either the first AW filter or the second AW filter is no greater than 1.2 decibels.
26. The filter bank die of claim 20 wherein a real estate area of the filter bank module is no greater than 2.56 square millimeters.
27. The filter bank die of claim 20 wherein a real estate area of the filter bank module is no greater than 4 square millimeters.
28. The filter bank die of claim 1 wherein the second filter skirt has a falling slope that is less than the gap of the second rising slope.
29. The filter bank die of claim 1 wherein the second filter skirt has a falling slope that is equal to the gap of the second rising slope.