Distributed power management apparatus
A distributed power management apparatus is provided. The distributed power management apparatus includes an envelope tracking (ET) integrated circuit (ETIC) and a distributed ETIC separated from the ETIC. The ETIC is configured to generate a number of ET voltages for a number of power amplifier circuits and the distributed ETIC is configured to generate a distributed ET voltage(s) for a distributed power amplifier circuit(s). In a non-limiting example, the number of power amplifier circuits and the distributed power amplifier circuit(s) can be disposed on opposite sides (e.g., top and bottom) of a wireless device. As such, in embodiments disclosed herein, the ETIC is provided closer to the power amplifier circuits and the distributed ETIC is provided closer to the distributed power amplifier circuit(s). By providing the ETIC and the distributed ETIC closer to the respective power amplifier circuits, it is possible to reduce trace inductance and unwanted signal distortion.
1. A distributed power management apparatus comprising:
a distributed envelope tracking (ET) integrated circuit (ETIC) comprising a distributed voltage circuit configured to generate a distributed ET voltage based on a distributed ET target voltage; and
an ETIC separated from the distributed ETIC and comprising:
a plurality of voltage circuits each configured to generate a respective one of a plurality of ET voltages and a respective one of a plurality of low-frequency currents based on a respective one of a plurality of ET target voltages; and
a control circuit configured to:
couple a selected one of the plurality of voltage circuits to the distributed ETIC to provide the respective one of the plurality of low-frequency currents to the distributed ETIC; and
cause a selected one of the plurality of ET target voltages to be provided to the distributed ETIC as the distributed ET target voltage.
2. The distributed power management apparatus of claim 1 , wherein the distributed ETIC comprises:
a distributed voltage amplifier configured to generate a distributed initial ET voltage based on the distributed ET target voltage; and
a distributed offset capacitor configured to raise the distributed initial ET voltage by a distributed offset voltage to generate the distributed ET voltage.
3. The distributed power management apparatus of claim 1 , wherein the plurality of voltage circuits each comprises:
a multi-level charge pump (MCP) configured to generate a low-frequency voltage based on a battery voltage;
a power inductor configured to induce a respective one of the plurality of low-frequency currents based on the low-frequency voltage;
a voltage amplifier configured to generate an initial ET voltage based on the respective one of the plurality of ET target voltages; and
an offset capacitor configured to raise the initial ET voltage by an offset voltage to generate the respective one of the plurality of ET voltages.
4. The distributed power management apparatus of claim 3 , wherein the control circuit is further configured to cause the MCP in the selected one of the plurality of voltage circuits to generate the low-frequency voltage based on the selected one of the plurality of ET target voltages.
5. The distributed power management apparatus of claim 4 , wherein the control circuit is further configured to deactivate the voltage amplifier in the selected one of the plurality of voltage circuits.
6. The distributed power management apparatus of claim 1 , wherein:
the ETIC further comprises an input switch circuit coupled to the distributed ETIC and the plurality of voltage circuits and configured to receive the plurality of ET target voltages from a transceiver circuit; and
the control circuit is further configured to control the input switch circuit to couple any of the plurality of ET target voltages to any of the plurality of voltage circuits.
7. The distributed power management apparatus of claim 6 , wherein the control circuit is further configured to control the input switch circuit to cause the selected one of the plurality of ET target voltages to be provided to the distributed ETIC and the selected one of the plurality of voltage circuits.
8. The distributed power management apparatus of claim 1 , wherein:
the ETIC further comprises an output switch circuit coupled between the plurality of voltage circuits and a plurality of voltage outputs; and
the control circuit is further configured to control the output switch circuit to couple any of the plurality of voltage circuits to any of the plurality of voltage outputs.
9. The distributed power management apparatus of claim 8 , wherein:
the distributed ETIC is coupled to the ETIC via a selected one of the plurality of voltage outputs; and
the control circuit is further configured to control the output switch circuit to couple the selected one of the plurality of voltage circuits to the selected one of the plurality of voltage outputs to provide the respective one of the plurality of low-frequency currents to the distributed ETIC.
10. The distributed power management apparatus of claim 9 , further comprising:
one or more power amplifier circuits each coupled to a respective one of the plurality of voltage outputs, wherein the respective one of the plurality of voltage outputs is different from the selected one of the plurality of voltage outputs that is coupled to the distributed ETIC; and
at least one distributed power amplifier circuit coupled to the distributed ETIC.
11. A wireless device comprising:
a distributed power management apparatus comprising:
a distributed envelope tracking (ET) integrated circuit (ETIC) comprising a distributed voltage circuit configured to generate a distributed ET voltage based on a distributed ET target voltage; and
an ETIC separated from the distributed ETIC and comprising:
a plurality of voltage circuits each configured to generate a respective one of a plurality of ET voltages and a respective one of a plurality of low-frequency currents based on a respective one of a plurality of ET target voltages; and
a control circuit configured to:
couple a selected one of the plurality of voltage circuits to the distributed ETIC to provide the respective one of the plurality of low-frequency currents to the distributed ETIC; and
cause a selected one of the plurality of ET target voltages to be provided to the distributed ETIC as the distributed ET target voltage;
one or more power amplifier circuits coupled to the ETIC; and
at least one distributed power amplifier circuit coupled to the distributed ETIC.
12. The wireless device of claim 11 , further comprising:
one or more antennas disposed along one side of the wireless device and each coupled to a respective one of the one or more power amplifier circuits; and
at least one distributed antenna disposed along an opposite side of the wireless device and coupled to the at least one distributed power amplifier circuit.
13. The wireless device of claim 11 , wherein:
the ETIC is disposed closer to any of the one or more power amplifier circuits than to the at least one distributed power amplifier circuit; and
the distributed ETIC is disposed closer to the at least one distributed power amplifier circuit than to any of the one or more power amplifier circuits.
14. The wireless device of claim 11 , wherein the distributed ETIC comprises:
a distributed voltage amplifier configured to generate a distributed initial ET voltage based on the distributed ET target voltage; and
a distributed offset capacitor configured to raise the distributed initial ET voltage by a distributed offset voltage to generate the distributed ET voltage.
15. The wireless device of claim 11 , wherein the plurality of voltage circuits each comprises:
a multi-level charge pump (MCP) configured to generate a low-frequency voltage based on a battery voltage;
a power inductor configured to induce a respective one of the plurality of low-frequency currents based on the low-frequency voltage;
a voltage amplifier configured to generate an initial ET voltage based on the respective one of the plurality of ET target voltages; and
an offset capacitor configured to raise the initial ET voltage by an offset voltage to generate the respective one of the plurality of ET voltages.
16. The wireless device of claim 15 , wherein the control circuit is further configured to:
cause the MCP in the selected one of the plurality of voltage circuits to generate the low-frequency voltage based on the selected one of the plurality of ET target voltages; and
deactivate the voltage amplifier in the selected one of the plurality of voltage circuits.
17. The wireless device of claim 11 , wherein:
the ETIC further comprises an input switch circuit coupled to the distributed ETIC and the plurality of voltage circuits and configured to receive the plurality of ET target voltages from a transceiver circuit; and
the control circuit is further configured to control the input switch circuit to couple any of the plurality of ET target voltages to any of the plurality of voltage circuits.
18. The wireless device of claim 17 , wherein the control circuit is further configured to control the input switch circuit to cause the selected one of the plurality of ET target voltages to be provided to the distributed ETIC and the selected one of the plurality of voltage circuits.
19. The wireless device of claim 11 , wherein:
the ETIC further comprises an output switch circuit coupled between the plurality of voltage circuits and a plurality of voltage outputs; and
the control circuit is further configured to control the output switch circuit to couple any of the plurality of voltage circuits to any of the plurality of voltage outputs.
20. The wireless device of claim 19 , wherein:
the distributed ETIC is coupled to the ETIC via a selected one of the plurality of voltage outputs; and
the control circuit is further configured to control the output switch circuit to couple the selected one of the plurality of voltage circuits to the selected one of the plurality of voltage outputs to provide the respective one of the plurality of low-frequency currents to the distributed ETIC.