Tracker circuit, communication device, and voltage supply method

A tracker circuit comprising:

• a first switched-capacitor circuit including a first input terminal and a plurality of first output terminals, each of the plurality of first output terminals configured to output a respective one voltage of a plurality of first discrete voltages;
• a second switched-capacitor circuit including a second input terminal and a plurality of second output terminals, each of the plurality of second output terminals configured to output a respective one voltage of a plurality of second discrete voltages;
• and
• a supply modulator including (i) a plurality of third input terminals, each of the plurality of third input terminals being coupled to a respective terminal of either the plurality of first output terminals or the plurality of second output terminals, and (ii) a third output terminal coupled to a power amplifier,
• wherein at least one voltage of the plurality of first discrete voltages has a level different from levels of the plurality of second discrete voltages, and
• wherein at least one voltage of the plurality of second discrete voltages has a level different from levels the plurality of first discrete voltages.

A voltage supply method operated in a tracker circuit, the method comprising:

• generating a plurality of first discrete voltages based on a first switched-capacitor circuit of the tracker circuit;
• generating a plurality of second discrete voltages based on a second switched-capacitor circuit of the tracker circuit;
• and
• selectively outputting at least one voltage of at least one of the plurality of first discrete voltages and the plurality of second discrete voltages to a power amplifier based on a supply modulator of the tracker circuit,
• wherein the at least one voltage of the plurality of first discrete voltages has a level different from levels of the plurality of second discrete voltages, and
• wherein the at least one voltage of the plurality of second discrete voltages has a level different from levels of the plurality of first discrete voltages.