US 12,316,356 B2
Signal processing device
Juinn-Horng Deng, Taoyuan (TW); Yuan-Pei Wang, Kaohsiung (TW); and Chung-Lien Ho, Zhubei (TW)
Assigned to INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE, Hsinchu (TW)
Filed by INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE, Hsinchu (TW)
Filed on Nov. 23, 2022, as Appl. No. 17/993,103.
Claims priority of application No. 111138438 (TW), filed on Oct. 11, 2022.
Prior Publication US 2024/0120955 A1, Apr. 11, 2024
Int. Cl. H04B 1/04 (2006.01); H04B 7/06 (2006.01)
CPC H04B 1/04 (2013.01) [H04B 7/0639 (2013.01); H04B 2001/0425 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A signal processing device, for suppressing a crosstalk nonlinear distortion of a radio frequency (RF) front end circuit, the RF front end circuit comprises a first power amplifier (PA), a second PA, a first filter and a second filter, the signal processing device comprising:
a first circuit, configured to receive a first input signal through a first input transmission path, receive a second input signal through a second input transmission path, generate a first pre-distortion (PD) signal and a second PD signal according to the first input signal and the second input signal, transmit the first PD signal to the first PA through the first input transmission path, and transmit the second PD signal to the second PA through the second input transmission path, wherein the first input signal has a first input bandwidth (BW), and the second input signal has a second input BW; and
a second circuit, configured to receive a first output signal through a first output feedback path, receive a second output signal through a second output feedback path, receive a first digital-pre-distortion (DPD) signal through a first feedback path, receive a second DPD signal through a second feedback path, generate a first control signal and a second control signal according to the first output signal, the second output signal, the first DPD signal and the second DPD signal, and control the first circuit to generate the first PD signal and the second PD signal according to the first control signal and the second control signal,
wherein, the first PA generates the first output signal through the first filter, the first filter has a first operating BW corresponding to the first input BW, and the second PA generates the second output signal through the second filter, the second filter has a second operating BW corresponding to the second input BW.