Method and device for selectively supplying voltage to multiple amplifiers using switching regulator

A portable communication device comprising:

• a plurality of antennas;
• a first communication chip connected with at least one antenna of the plurality of antennas, and including a first amplifier for signal transmission, and a first circuit portion including a first linear regulator, the first amplifier connected with the first circuit portion including the first linear regulator;
• a second communication chip connected with at least one antenna of the plurality of antennas, and including a second amplifier for signal transmission, and a second circuit portion including a second linear regulator, the second amplifier connected with the second circuit portion including the second linear regulator;
• and
• a switching regulator disposed outside the first communication chip and the second communication chip, and connected with each of the first circuit portion including the first linear regulator and the second circuit portion including the second linear regulator,
• wherein the first circuit portion, including the first linear regulator, is configured to supply a first voltage to the first amplifier based on a first envelope signal of a first input radio-frequency (RF) signal so that the regulated first voltage can be used for envelope tracking based at least on a first signal to be output from the switching regulator,
• wherein the second circuit portion, including the second linear regulator, is configured to supply a second voltage to the second amplifier based on a second envelope signal of a second input radio-frequency (RF) signal so that the second voltage can be used for envelope tracking based at least on a second signal to be output from the switching regulator.