公开(公告)号：US20230110683A1

公开(公告)日：2023-04-13

申请号：US17667520

申请日：2022-02-08

Applicant: Realtek Semiconductor Corp.

Inventor： Chien-Wen Chen ,  Meng-Chun Chang ,  Chih-Yu Chen

IPC: H04B1/04 ,  H03G3/30

Abstract: A feedforward echo cancellation device includes: a first impedance circuit for responding to a transmission current to output a first current to a node; an echo cancellation current generating circuit for drawing an echo cancellation current from the node; a circuit module that is coupled to the echo cancellation current generating circuit and the node has a first impedance value adjusted based on a system convergence index of a communication device, where the first impedance value is used to determine a gain of a programmable gain amplifier in the communication device; and a second impedance circuit for responding to the transmission current to output a second current to the node, where a second impedance value of the second impedance circuit is adjusted based on the first impedance value of the circuit module accordingly. Specifically, the node is coupled to an input terminal of the programmable gain amplifier.

公开(公告)号：US11671124B2

公开(公告)日：2023-06-06

申请号：US17667520

申请日：2022-02-08

Applicant: Realtek Semiconductor Corp.

Inventor： Chien-Wen Chen ,  Meng-Chun Chang ,  Chih-Yu Chen

IPC: H04B1/04 ,  H03G3/30

CPC classification number: H04B1/04 ,  H03G3/3052 ,  H03G2201/103 ,  H04B2001/0416

Abstract: A feedforward echo cancellation device includes: a first impedance circuit for responding to a transmission current to output a first current to a node; an echo cancellation current generating circuit for drawing an echo cancellation current from the node; a circuit module that is coupled to the echo cancellation current generating circuit and the node has a first impedance value adjusted based on a system convergence index of a communication device, where the first impedance value is used to determine a gain of a programmable gain amplifier in the communication device; and a second impedance circuit for responding to the transmission current to output a second current to the node, where a second impedance value of the second impedance circuit is adjusted based on the first impedance value of the circuit module accordingly. Specifically, the node is coupled to an input terminal of the programmable gain amplifier.