公开(公告)号：US20240426898A1

公开(公告)日：2024-12-26

申请号：US18743626

申请日：2024-06-14

Applicant: Infineon Technologies AG

Inventor： Faisal AHMED ,  Muhammad FURQAN ,  Stefan HERZINGER ,  Thomas OBERMUELLER

IPC: G01R31/28

Abstract: Test signal circuit for testing a radio frequency receiver circuit, including: a test signal generator configured to generate a baseband test signal, a modulator configured to modulate a local oscillator signal with the baseband test signal to generate a test signal, a first transmission element coupled between the modulator and an input of an impedance transforming element, a second transmission element coupled to an output of the impedance transforming element, the impedance transforming element configured to lower a first impedance level of the first transmission element to a second impedance level of a second transmission element, a voltage level detector coupled to the first transmission element, the voltage level detector being configured to detect a voltage level of the test signal. The disclosure further relates to a semiconductor chip including the test signal circuit and a system including the test signal circuit and a control circuit.

公开(公告)号：US20240393429A1

公开(公告)日：2024-11-28

申请号：US18323967

申请日：2023-05-25

Applicant: Infineon Technologies AG

Inventor： Thomas OBERMUELLER ,  Andreas SCHWARZ ,  Stefan HERZINGER ,  Bernhard BERGER ,  Stefan SCHMALZL ,  Faisal AHMED ,  Muhammad FURQAN

IPC: G01S7/40 ,  G01R29/08

Abstract: A device may include a receive (Rx) antenna input to couple an Rx antenna to an Rx chain, and a signal coupler to inject the test signal toward the Rx antenna. The device may include an Rx antenna switch to, in a first switch state, cause the Rx antenna to be isolated from the Rx chain and, in a second switch state, permit the test signal to probe the Rx antenna. The Rx chain may measure a phasor of a first baseband signal generated based on a first reflected test signal and a phasor of a second baseband signal generated based on a second reflected test signal. The device may include a control circuit to compute a complex ratio based on the phasors, compute a measured reflection coefficient based on the complex ratio and using a transfer function, and monitor an impedance matching of the Rx antenna.