US 12,407,305 B2
Amplifier output stage with DC-shifting circuit for high-speed supply modulator
Shih-Hsiung Chien, Hsinchu (TW); Sung-Han Wen, Hsinchu (TW); and Kuan-Ta Chen, Hsinchu (TW)
Assigned to MEDIATEK INC., Hsinchu (TW)
Filed by MEDIATEK INC., Hsin-Chu (TW)
Filed on Aug. 10, 2022, as Appl. No. 17/884,589.
Claims priority of provisional application 63/243,765, filed on Sep. 14, 2021.
Prior Publication US 2023/0078955 A1, Mar. 16, 2023
Int. Cl. H03F 3/04 (2006.01); H03G 3/20 (2006.01); H03F 1/02 (2006.01)
CPC H03F 3/04 (2013.01) [H03F 1/0211 (2013.01); H03F 1/0244 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A linear amplifier, comprising:
an amplifier stage, configured to generate a first signal and a second signal;
a DC-shifting stage, configured to adjust a DC voltage of the first signal and a DC voltage of the second signal to generate an adjusted first signal and an adjusted second signal;
a compensation network, configured to generate a first driving signal and a second driving signal according to the first signal, the second signal, the adjusted first signal and the adjusted second signal; and
a power stage, configured to generate an output signal according to the first driving signal and the second driving signal;
wherein the compensation network performs a high-pass filtering operation on the first signal, performs a low-pass filtering operation on the adjusted first signal, and combines a high-pass filtering result of the first signal and a low-pass filtering result of the adjusted first signal to generate the first driving signal.