公开(公告)号：US20170244433A1

公开(公告)日：2017-08-24

申请号：US15068225

申请日：2016-03-11

Applicant: Broadcom Corporation

Inventor： Choong Yul CHA ,  Hongrui WANG ,  Ravi GUPTA ,  Ali AFSAHI

IPC: H04B1/04

CPC classification number: H04B1/04

Abstract: A broadband digital transmitter is disclosed. The digital transmitter includes a vector decomposer circuit, a phase selector circuit, and a digital power amplifier (DPA). The vector decomposer circuit receives baseband in-phase (I) and quadrature (Q) signals and decomposes the baseband I and Q signals into an offset envelope signal and a non-offset envelope signal. The phase selector circuit receives a plurality of phase offset local oscillator (LO) signals and outputs, responsive to the baseband I and Q signals, offset LO signals and non-offset LO signals. The DPA processes the offset envelope signal, the non-offset envelope signal, the offset LO signals, and the non-offset LO signals to generate an output signal of the digital transmitter.

公开(公告)号：US20170250728A1

公开(公告)日：2017-08-31

申请号：US15087322

申请日：2016-03-31

Applicant: Broadcom Corporation

Inventor： Ali AFSAHI ,  Hongrui WANG

IPC: H04B1/44

CPC classification number: H04B1/44

Abstract: A transmit/receive switch architecture is provided which reuses a power amplifier's transformer as part of the low noise amplifier (LNA) input matching network. A front-end circuit includes a transmit/receive switch. The transmit/receive switch includes a transformer that includes primary winding and secondary winding. The transmit/receive also includes a transistor, where a drain of the transistor is connected to the secondary winding and a gate of the transistor is configured to receive a control signal. The transmit/receive switch operates as a receive switch when the control signal is low and inputs of the primary winding are either shorted or at open circuit. The transmit/receive switch operates as a transmit switch when the control signal is high.