MULTI-CHIP TX BEAMFORMING FOR PER-PACKET SWITCHING WITH REDUCED LO LEAKAGE

• Main Authors: NATHAWAD, Lalitkumar, ABDOLLAHI-ALIBEIK, Shahram, PARK, Hyunsik
• Format: Patent
• Language: English; French; German
• Published: 01.08.2018
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION

A wireless communications device that produces phase-synchronized local oscillator (LO) signals. The device includes a first transceiver chain to receive a first timing signal and a second transceiver chain to receive the first timing signal and a second timing signal. The first transceiver chain includes a first frequency divider to convert the first timing signal to a first LO signal. The second transceiver chain includes a multiplexer to select one of the timing signals based at least in part on a mode select signal. A second frequency divider in the second transceiver chain converts the selected timing signal to a second LO signal, and a phase alignment circuit aligns a phase of the second LO signal with a first alignment signal. The first alignment signal is activated, for a limited duration, in response to a change in state of the mode select signal.