公开(公告)号：US11228281B2

公开(公告)日：2022-01-18

申请号：US16439713

申请日：2019-06-13

Applicant: MEDIATEK INC.

Inventor： Yu-Hsien Chang ,  Yu-Ming Lai ,  Ching-Chia Cheng ,  Wei-Kai Hong ,  Yi-Chu Chen ,  Tsung-Ming Chen ,  Shih-Chieh Yen

IPC: H03F1/32 ,  H03F1/02 ,  H03F3/193 ,  H03F3/21

Abstract: A calibration apparatus is used for calibrating characteristics of a power amplifier (PA) in a transmitter. The calibration apparatus includes an adaptive bias generator circuit that is used to track an envelope of an input signal received by control terminals of transistors of the PA and generate an adaptive bias voltage to the control terminals of the input transistors in response to the envelope of the input signal.

公开(公告)号：US20200028469A1

公开(公告)日：2020-01-23

申请号：US16439713

申请日：2019-06-13

Applicant: MEDIATEK INC.

Inventor： Yu-Hsien Chang ,  Yu-Ming Lai ,  Ching-Chia Cheng ,  Wei-Kai Hong ,  Yi-Chu Chen ,  Tsung-Ming Chen ,  Shih-Chieh Yen

IPC: H03F1/02 ,  H03F1/32 ,  H03F3/21 ,  H03F3/193

Abstract: A calibration apparatus is used for calibrating characteristics of a power amplifier (PA) in a transmitter. The calibration apparatus includes an adaptive bias generator circuit that is used to track an envelope of an input signal received by control terminals of transistors of the PA and generate an adaptive bias voltage to the control terminals of the input transistors in response to the envelope of the input signal.

公开(公告)号：US20230006611A1

公开(公告)日：2023-01-05

申请号：US17857132

申请日：2022-07-04

Applicant: MediaTek Inc.

Inventor： Po-Yu Chen ,  Hao Chen ,  Yi-Min Tsai ,  Hao Yun Chen ,  Hsien-Kai Kuo ,  Hantao Huang ,  Hsin-Hung Chen ,  Yu Hsien Chang ,  Yu-Ming Lai ,  Lin Sen Wang ,  Chi-Tsan Chen ,  Sheng-Hong Yan

IPC: H03F1/32 ,  H03F1/02 ,  G06K9/62 ,  G06N3/063

Abstract: A compensator compensates for the distortions of a power amplifier circuit. A power amplifier neural network (PAN) is trained to model the power amplifier circuit using pre-determined input and output signal pairs that characterize the power amplifier circuit. Then a compensator is trained to pre-distort a signal received by the PAN. The compensator uses a neural network trained to optimize a loss between a compensator input and a PAN output, and the loss is calculated according to a multi-objective loss function that includes one or more time-domain loss function and one or more frequency-domain loss functions. The trained compensator performs signal compensation to thereby output a pre-distorted signal to the power amplifier circuit.

公开(公告)号：US11324048B2

公开(公告)日：2022-05-03

申请号：US16904519

申请日：2020-06-17

Applicant: MEDIATEK INC.

Inventor： Yu-Ming Lai ,  Kai-Hsiang Yang ,  Wen-Ying Chien ,  Tsai-Yuan Hsu ,  Yu-Hsien Chang ,  Yu-Ming Wen ,  Ying-Che Hung ,  Pei-Wen Hung

IPC: H04W74/08 ,  H04B17/318 ,  H04B17/336 ,  H04W24/10

Abstract: A communications apparatus includes a plurality of communications circuits and a coexistence management circuit. Each communications circuit is configured to provide wireless communications services in compliance with a protocol. The coexistence management circuit is configured to manage radio activities of the communications circuits. In response to a detection result of at least two radio activities to occur in a subsequent packet time, the coexistence management circuit is configured to determine whether an interference signal related to said at least two radio activities falls in a predetermined frequency band, and when the interference signal falls in the predetermined frequency band, the coexistence management circuit is configured to adjust a transmission power or an execution time of one of said at least two radio activities.