Methods for antenna switch modules
Methods for antenna switch modules are disclosed. In certain implementations, a method of making an antenna switch module is provided. The method includes providing a package substrate implemented to receive one or more electrical components, attaching a silicon on insulator (SOI) die to the package substrate, and providing an integrated filter. The SOI die includes a capacitor and a switch coupled to a plurality of radio frequency (RF) signal paths. The integrated filter filters an RF signal received on a first RF signal path of the plurality of RF signal paths, and includes the capacitor of the SOI die and an inductor.
1. A method of making an antenna switch module, the method comprising:
providing a package substrate implemented to receive one or more electrical components;
attaching a silicon on insulator (SOI) die to the package substrate, the SOI die including a first capacitor and a switch coupled to a plurality of radio frequency (RF) signal paths; and
providing a first integrated filter that filters an RF signal received on a first RF signal path of the plurality of RF signal paths, the first integrated filter including the first capacitor of the SOI die and a first inductor.
2. The method of claim 1 wherein the first inductor is a surface mount component, the method further comprising attaching the first inductor to the package substrate.
3. The method of claim 1 further comprising implementing the first inductor at least partly from a first conductive layer of a plurality of conductive layers of the package substrate, the first conductive layer disposed beneath a layer of the package substrate used to attach the SOI die.
4. The method of claim 3 further comprising implementing the first inductor from trace of two or more of the plurality of conductive layers.
5. The method of claim 3 further comprising implementing the inductor to have an inductance ranging between about 2.5 nH and about 7 nH.
6. The method of claim 1 further comprising providing a second integrated filter that filters an RF signal received on a second RF signal path of the plurality of RF signal paths, the second integrated filter including a second capacitor of the SOI die and a second inductor.
7. The method of claim 6 further comprising implementing the first and second inductors at least partly from a first conductive layer of a plurality of conductive layers of the package substrate, the first conductive layer disposed beneath a layer of the package substrate used to attach the SOI die.
8. The method of claim 7 further comprising electrically isolating the first and second inductors using a column of vias of the package substrate.
9. The method of claim 8 further comprising implementing the column of vias of the package substrate to be aligned with one another.
10. The method of claim 8 further comprising implementing the column of vias of the package substrate to be staggered with respect to one another.
11. The method of claim 6 wherein the first inductor is a surface mount component, the method further comprising attaching the first inductor to the package substrate and implementing the second inductor at least partly from a first conductive layer of a plurality of conductive layers of the package substrate, the first conductive layer disposed beneath a layer of the package substrate used to attach the SOI die.
12. The method of claim 6 wherein the first inductor is a first surface mount component and the second inductor is a second surface mount component, the method further comprising attaching the first and second inductors to the package substrate.
13. The method of claim 1 wherein attaching the SOI die to the package substrate includes electrically connecting the SOI die to the package substrate using bond wires.
14. The method of claim 1 wherein attaching the SOI die to the package substrate includes electrically connecting the SOI die to the package substrate using solder bumps.
15. A method of switching in an antenna switch module, the method comprising:
receiving a plurality of radio frequency (RF) signals at a multi-throw switch over a plurality of RF signal paths, the multi-throw switch being disposed on a silicon on insulator (SOI) die attached to a package substrate;
filtering a first RF signal of the plurality of RF signals to generate a first filtered signal using a first integrated filter, the first integrated filter including a first capacitor of the SOI die and a first inductor associated with the package substrate; and
providing the filtered signal to an antenna using the multi-throw switch.
16. The method of claim 15 further comprising receiving the first RF signal from an output of a power amplifier.
17. The method of claim 15 further comprising filtering a second RF signal of the plurality of RF signals to generate a second filtered signal using a second integrated filter, the second integrated filter including a second capacitor of the SOI die and a second inductor associated with the package substrate.
18. The method of claim 17 wherein the first inductor and the second inductor are implemented using a plurality of conductive layers of the package substrate, the method further comprising electrically isolating the first and second inductors using a column of vias of the package substrate.
19. The method of claim 17 wherein filtering the first RF signal includes filtering a high band radio frequency signal in an 1800 MHz band or a 1900 MHz band.
20. The method of claim 19 wherein filtering the first RF signal includes filtering a low band radio frequency signal in an 800 MHz band or a 900 MHz band.