Hybrid switched mode/linear power amplifier power supply for use in polar transmitter
DCFirst Claim
1. A DC-DC converter, comprising:
- a switch mode part between a DC source and a load, the switch mode part is configured to provide x amount of output power; and
a linear mode part in parallel with the switch mode part between the same or a different DC source and the load, the linear mode part configured to provide y amount of output power, where x is greater than y, and the ratio of x to y is optimized for particular application constraints,where the linear mode part exhibits a faster response time to a required change in output voltage than the switch mode part, where the linear mode part compensates at least in part for load variations, wherein the switch mode part is configured to be switchable between a slave mode controlled by the linear mode part and a master mode.
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Abstract
In one aspect this invention provides a DC-DC converter that has a switch mode part for coupling between a DC source and a load, the switch mode part providing x amount of output power; and that further has a linear mode part coupled in parallel with the switch mode part between the DC source and the load, the linear mode part providing y amount of output power, where x is preferably greater than y, and the ratio of x to y may be optimized for particular application constraints. In a further aspect there is a radio frequency (RF) transmitter (TX) for coupling to an antenna, where the TX has a polar architecture having an amplitude modulation (AM) path coupled to a power supply of a power amplifier (PA) and a phase modulation (PM) path coupled to an input of the PA, where the power supply includes the switch mode part for coupling between a battery and the PA and the linear mode part coupled in parallel with the switch mode part between the battery and the PA.
121 Citations
24 Claims
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1. A DC-DC converter, comprising:
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a switch mode part between a DC source and a load, the switch mode part is configured to provide x amount of output power; and a linear mode part in parallel with the switch mode part between the same or a different DC source and the load, the linear mode part configured to provide y amount of output power, where x is greater than y, and the ratio of x to y is optimized for particular application constraints, where the linear mode part exhibits a faster response time to a required change in output voltage than the switch mode part, where the linear mode part compensates at least in part for load variations, wherein the switch mode part is configured to be switchable between a slave mode controlled by the linear mode part and a master mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A DC-DC converter, comprising:
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a switch mode part between a DC source and a load, the switch mode part is configured to provide x amount of output power; and a linear mode part in parallel with the switch mode part between the same or a different DC source and the load, the linear mode part configured to provide v amount of output power, where x is greater than y, and the ratio of x to y is optimized for particular application constraints, where the linear mode part exhibits a faster response time to a required change in output voltage than the switch mode part, where the linear mode part compensates at least in part for load variations, where the switch mode part is coupled to the load and to the output of the linear mode part through an inductance, and where the linear mode part is coupled to the output of the switch mode part, via the inductance, and to the load through a capacitance.
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Specification