US 12,308,808 B2
Semiconductor device and communication device including the same
Seong Won Joo, Seoul (KR); Surin Gweon, Suwon-si (KR); and Jeong Kyun Woo, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Aug. 5, 2022, as Appl. No. 17/881,734.
Claims priority of application No. 10-2021-0140288 (KR), filed on Oct. 20, 2021; and application No. 10-2022-0048678 (KR), filed on Apr. 20, 2022.
Prior Publication US 2023/0117533 A1, Apr. 20, 2023
Int. Cl. H03F 3/45 (2006.01); H04B 1/40 (2015.01)
CPC H03F 3/45475 (2013.01) [H04B 1/40 (2013.01); H03F 2200/129 (2013.01); H03F 2200/451 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A semiconductor device comprising:
a first amplifier configured to amplify a first input signal and a second input signal and output a first amplified signal and a second amplified signal;
a second amplifier configured to receive and amplify the first amplified signal and the second amplified signal and output a first output signal and a second output signal;
a feedforward circuit configured to receive the first input signal and the second input signal and perform feedforward control on the first output signal and second output signal; and
a common-mode feedback circuit configured to receive the first output signal and the second output signal and generate a feedback signal to adjust an average of the first output signal and the second output signal to correspond to a reference signal and output the feedback signal, and the common-mode feedback circuit configured to supply the feedback signal to the first amplifier and the feedforward circuit,
wherein the feedforward circuit includes a first transistor configured to receive a bias voltage to control a fixed current to flow into the feedforward circuit while the feedforward circuit is enabled, and a second transistor configured to receive the feedback signal from the common-mode feedback circuit to control a bias current having a variable level to flow into the feedforward circuit while the feedforward circuit is enabled.