Supply modulator including switched-mode power supplier and transmitting device including the same

A supply modulator comprising:

• a plurality of power suppliers configured to provide a modulated voltage to an output node, the plurality of power suppliers comprising a first switched-mode power supplier configured to generate the modulated voltage based on an envelope signal,
• wherein the first switched-mode power supplier comprises:
• a pulse input node configured to receive a pulse signal generated in association with the envelope signal;
• and
• a plurality of stages sequentially connected between the pulse input node and the output node, the plurality of stages configured to adjust the modulated voltage by filtering a certain frequency band of the pulse signal,
• wherein the plurality of stages comprises at least one variable impedance.

A supply modulator comprising:

• a plurality of power suppliers configured to provide a modulated voltage to an output node, the plurality of power suppliers comprising a first switched-mode power supplier connected to the output node,
• wherein the first switched-mode power supplier comprises:
• a pulse input node configured to receive a pulse signal generated in association with an envelope signal of a baseband signal;
• and
• a low pass filter comprising a plurality of stages sequentially connected between the pulse input node and the output node, the number of the plurality of stages determining an order of the low pass filter, and
• wherein the plurality of stages comprises at least one variable impedance.