公开(公告)号：US20230421428A1

公开(公告)日：2023-12-28

申请号：US18338895

申请日：2023-06-21

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Prakhar AGRAWAL ,  Sucheth KUNCHAM

IPC: H04L27/36

CPC classification number: H04L27/364

Abstract: In an example, a system includes a transmitter configured to transmit a quadrature amplitude modulation (QAM) signal, where the QAM signal includes an in-phase (I) chain signal and a quadrature (Q) chain signal. The system includes a receiver configured to receive the QAM signal from the transmitter. The system includes a delay element configured to introduce a phase delay between the transmitter and the receiver. The system includes a controller configured to determine an IQ mismatch (IQMM) of a transmitter-receiver loop without a phase delay, and to determine an IQMM of the transmitter-receiver loop with a phase delay introduced by the delay element. The controller is configured to determine an IQMM of the transmitter based on the IQMM of the transmitter-receiver loop without the phase delay and the IQMM of the transmitter-receiver loop with the phase delay. The controller is configured to correct the IQMM of the transmitter.

公开(公告)号：US20230421189A1

公开(公告)日：2023-12-28

申请号：US18308556

申请日：2023-04-27

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sucheth Sureshbabu KUNCHAM ,  Prakhar AGRAWAL ,  Rohit CHATTERJEE

IPC: H04B1/10 ,  H03D7/12 ,  H04L27/38

CPC classification number: H04B1/109 ,  H03D7/12 ,  H04L27/38

Abstract: In an example, a system includes a receiver configured to receive a differential input signal from a quadrature amplitude modulation (QAM) transmitter at a differential interface that includes a first input and a second input. The system also includes a first switch coupled to the first input and a second switch coupled to the second input, where the first switch and second switch are configured to couple the first input and the second input to a complex mixer in a non-inverting configuration. The system includes a third switch coupled to the first input and a fourth switch coupled to the second input, where the third switch and the fourth switch are configured to couple the first input and the second input to the complex mixer in an inverting configuration. The complex mixer is configured to produce an output signal based on the non-inverting configuration and the inverting configuration.