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

A portable communication device comprising:

• an antenna;
• a communication chip including a linear regulator disposed therein and operatively connected with the antenna;
• and
• a switching regulator disposed outside the communication chip and operatively connected with the linear regulator;
• wherein a first voltage corresponding to an envelope of an input radio-frequency (RF) signal is to be provided by the linear regulator based at least in part on a second voltage provided by the switching regulator.

A communication chip for mounting on a circuit board of an electronic device to amplify a radio-frequency signal to be transmitted or received through an antenna of the electronic device, the communication chip comprising:

• an amplifier configured to receive an input signal, wherein a radio-frequency signal to be transmitted through the antenna corresponds to the input signal of the amplifier;
• and
• a linear regulator configured to provide the amplifier with a first voltage corresponding to an envelope of the input signal based at least in part on a second voltage provided by the switching regulator,
• wherein the linear regulator and the amplifier are disposed inside the communication chip, and the switching regulator is not disposed inside the communication chip.

A portable communication device comprising:

• an antenna;
• a switching regulator;
• an amplifier operably connected to the switching regulator and configured to amplify an input RF signal;
• a linear regulator operably connected to the switching regulator and the amplifier;
• and
• an ET DAC configured to control the linear regulator to provide the amplifier with a voltage corresponding to an envelope of the input RF signal,
• wherein a first electric path between the linear regulator and the switching regulator is longer than a second electric path between the linear regulator and the amplifier.