| CPC H03F 1/0238 (2013.01) [H03F 3/245 (2013.01); H03F 1/0244 (2013.01); H03F 2200/105 (2013.01); H03F 2200/451 (2013.01)] | 20 Claims |
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1. A supply modulator configured to provide an output voltage to a power amplifier, and operate in a discrete level-envelope tracking mode, the supply modulator comprising:
a multiple output voltage generating circuit configured to output a selected voltage among a plurality of voltages and provide a first output current with a high-frequency to an output node, the plurality of voltages having different levels from each other, and the different levels respectively corresponding to a plurality of reference output voltage signals;
a switching regulator configured to output a switching regulator voltage and provide a second output current with a low-frequency to the output node, the output voltage being based on the switching regulator voltage and the selected voltage among the plurality of voltages;
a switching regulator controller configured to sense the first output current of the multiple output voltage generating circuit to obtain a sensing value and control the switching regulator based on the sensing value; and
a main controller configured to
generate the plurality of reference output voltage signals,
determine a tracking mode of the supply modulator, and
control the multiple output voltage generating circuit and the switching regulator controller based on the tracking mode,
wherein a selection with respect to the plurality of voltages is performed based on a digital envelope signal provided from outside, and
an output current of the supply modulator comprises a sum of the first output current and the second output current.
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