Abstract: This disclosure relates generally to the field of wireless communication infrastructure, and more particularly to a method, apparatus and system for envelope tracking. The system for envelope tracking comprising: a transistor; an RF transistor; a driver; a switcher current source; and a subtracting network; wherein the system is configured such that when an envelope voltage is less than a predetermined voltage value, the RF transistor is configured for decreasing an amount of absorbed biasing current, and when the envelope voltage is greater than a predetermined voltage value, the RF transistor is configured for increasing an amount of absorbed biasing current. The goal of RF transistor sinking is to absorb the redundant biasing current generated by the envelope tracking supply modulator to eliminate distortions.

Abstract: This disclosure relates generally to the field of wireless communication infrastructure, and more particularly to a method, apparatus and system for envelope tracking. The system for envelope tracking comprising: a transistor; an RF transistor; a driver; a switcher current source; and a subtracting network; wherein the system is configured such that when an envelope voltage is less than a predetermined voltage value, the RF transistor is configured for decreasing an amount of absorbed biasing current, and when the envelope voltage is greater than a predetermined voltage value, the RF transistor is configured for increasing an amount of absorbed biasing current. The goal of RF transistor sinking is to absorb the redundant biasing current generated by the envelope tracking supply modulator to eliminate distortions.

Abstract: The present invention proposes a method for adjusting a parameter (IDQ) of a power device (1) by changing an input signal (VG) to said power device, said method comprising the steps of taking (S2) a sample of an output signal (POUT) of said power device (1), detecting (S5) at least a first and a second signal component level (P1ST, P2ND) of said sampled output signal (POUT), processing (S6) the at least detected first and second signal component level (P1ST, P2ND), deciding on the basis of a result obtained in said processing step (S6), whether a compensation of a change of said parameter (IDQ) is required, and if such a change is to be compensated, determining (S8) a changing value (V) for said input signal (VG) and adjusting (S9) the parameter (IDQ) by changing said input signal (VG) by said determined changing value (V). Furthermore, the present invention proposes a corresponding device.