Wideband power combiner and splitter
Wideband power combiners and splitters are provided herein. In certain embodiments, a power combiner/splitter is implemented with a first coil connecting a first port and a second port, and a second coil connecting a third port and a fourth port. The first coil and the second coil are inductively coupled to one another. For example, the first coil and the second coil can be formed using adjacent conductive layers of a semiconductor chip, an integrated passive device, or a laminate. The power combiner/splitter further includes a fifth port tapping a center of the first coil and a sixth port tapping a center of the second coil. The fifth port and the sixth port serve to connect capacitors and/or other impedance to the center of the coils to thereby provide wideband operation.
1. A mobile device comprising:
a transceiver configured to generate a radio frequency signal; and
a front-end system including a first amplifier configured to amplify the radio frequency signal, a second amplifier configured to amplify the radio frequency signal, and a power splitter including a first port configured to receive the radio frequency signal, a second port coupled to an input of the first amplifier, a first conductive coil connecting the first port to the second port, a third port, a fourth port coupled to an input of the second amplifier, a second conductive coil connecting the third port to the fourth port and inductively coupled to the first conductive coil, a fifth port connected along the first conductive coil, a first capacitor coupled between the fifth port and a reference voltage, a sixth port connected along the second conductive coil, and a second capacitor coupled between the sixth port and the reference voltage.
2. The mobile device of claim 1 wherein the power splitter further includes a third capacitor connected between the first port and the third port, and a fourth capacitor connected between the second port and the fourth port.
3. The mobile device of claim 1 wherein the first conductive coil and the second conductive coil are interleaved.
4. The mobile device of claim 1 wherein the first port and the third port are directly adjacent to one another with no intervening ports, and the second port and the fourth port are directly adjacent to one another with no intervening ports.
5. The mobile device of claim 1 wherein the fifth port is directly adjacent to the third port with no intervening ports, and the sixth port is directly adjacent to the fourth port with no intervening ports.
6. The mobile device of claim 1 wherein the first port, the third port, and the fifth port are aligned on a first side of the power splitter, and the second port, the fourth port, and the sixth port are aligned on a second side of the power splitter opposite the first side.
7. The mobile device of claim 1 wherein the first amplifier corresponds to a carrier amplifier and the second amplifier corresponds to a peaking amplifier.
8. The mobile device of claim 1 wherein the reference voltage is ground.
9. The mobile device of claim 1 wherein the fifth port taps a center of the first conductive coil, and the sixth port taps a center of the second conductive coil.
10. A power splitting system comprising:
a first amplifier;
a second amplifier; and
a power splitter including a first port configured to receive a radio frequency signal, a second port coupled to an input of the first amplifier, a first conductive coil connecting the first port to the second port, a third port, a fourth port coupled to an input of the second amplifier, a second conductive coil connecting the third port to the fourth port and inductively coupled to the first conductive coil, a fifth port connected along the first conductive coil, a first capacitor coupled between the fifth port and a reference voltage, a sixth port connected along the second conductive coil, and a second capacitor coupled between the sixth port and the reference voltage.
11. The power splitting system of claim 10 wherein the power splitter further includes a third capacitor connected between the first port and the third port, and a fourth capacitor connected between the second port and the fourth port.
12. The power splitting system of claim 10 wherein the first conductive coil and the second conductive coil are interleaved.
13. The power splitting system of claim 10 wherein the first port and the third port are directly adjacent to one another with no intervening ports, and the second port and the fourth port are directly adjacent to one another with no intervening ports.
14. The power splitting system of claim 10 wherein the fifth port is directly adjacent to the third port with no intervening ports, and the sixth port is directly adjacent to the fourth port with no intervening ports.
15. The power splitting system of claim 10 wherein the first port, the third port, and the fifth port are aligned on a first side of the power splitter, and the second port, the fourth port, and the sixth port are aligned on a second side of the power splitter opposite the first side.
16. The power splitting system of claim 10 wherein the first amplifier corresponds to a carrier amplifier and the second amplifier corresponds to a peaking amplifier.
17. The power splitting system of claim 10 wherein the reference voltage is ground.
18. The power splitting system of claim 10 wherein the fifth port taps a center of the first conductive coil, and the sixth port taps a center of the second conductive coil.
19. A method of power splitting in a mobile device, the method comprising:
receiving a radio frequency input signal at a first port of a power splitter, the power splitter including a first conductive coil connected between the first port and a second port, and a second conductive coil connected between a third port and a fourth port and inductively coupled to the first conductive coil;
providing a first radio frequency signal from the second port of the power splitter to an input of a first amplifier;
providing a second radio frequency signal from the fourth port to an input of a second amplifier;
tuning the power splitter using a first capacitor coupled between a fifth port of the power splitter and a reference voltage, the fifth port connected along the first conductive coil; and
tuning the power splitter using a second capacitor coupled between a sixth port of the power splitter and the reference voltage, the sixth port connected along the second conductive coil.
20. The method of claim 19 further comprising receiving the radio frequency input signal from a transceiver.