US 12,395,136 B2
High-efficiency amplifier architecture with de-gain stage
Sung-Han Wen, Hsinchu (TW); Yu-Hung Lin, Hsinchu (TW); Shih-Hsiung Chien, Hsinchu (TW); and Chi-Heng Chung, Hsinchu (TW)
Assigned to MEDIATEK INC., Hsinchu (TW)
Filed by MEDIATEK INC., Hsin-Chu (TW)
Filed on Jun. 30, 2022, as Appl. No. 17/853,945.
Claims priority of provisional application 63/242,511, filed on Sep. 10, 2021.
Prior Publication US 2023/0077479 A1, Mar. 16, 2023
Int. Cl. H03F 3/21 (2006.01); H03F 3/16 (2006.01); H03F 3/30 (2006.01); H03F 3/393 (2006.01); H03F 3/45 (2006.01)
CPC H03F 3/21 (2013.01) [H03F 3/16 (2013.01); H03F 3/301 (2013.01); H03F 3/393 (2013.01); H03F 3/45632 (2013.01); H03F 2200/186 (2013.01); H03F 2200/432 (2013.01); H03F 2200/451 (2013.01); H03F 2203/45281 (2013.01); H03F 2203/45708 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An amplifier, comprising:
an input stage, configured to receive an input signal to generate an amplified signal;
an amplifier stage, coupled to the input stage, configured to generate a first driving signal and a second driving signal according to the amplified signal;
a power stage comprising a first input terminal and a second input terminal, wherein the power stage is coupled to a supply voltage and a ground voltage, for receiving the first driving signal and the second driving signal from the first input terminal and the second input terminal, respectively, and generating an output signal; and
a de-gain stage, coupled to the power stage, configured to generate a first control signal to the first input terminal according to the second driving signal;
wherein the de-gain stage comprises:
a first low-pass filter, configured to filter the second driving signal to generate a filtered second driving signal; and
a first control circuit, coupled to the first low-pass filter, configured to generate the first control signal to the first input terminal of the power stage to limit a swing of the first driving signal according to the filtered second driving signal.